ADS1015
ADS1015
12-Bit
ADC
DS I C
Interface
2
Voltage
Reference
Oscillator
SCL
SDA
ADDR
ADS1013
AIN1
AIN0
12-Bit
ADC
DS I C
Interface
2
Voltage
Reference
Oscillator
ALERT/RDY
SCL
SDA
ADDR
PGA
Comparator
ADS1015
ADS1014
MUX
AIN1
AIN2
AIN0
AIN3
ADS1015
Only
VDD
GND
VDD
GND
ADS1013
ADS1014
ADS1015
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SBAS473C –MAY 2009–REVISED OCTOBER 2009
Ultra-Small, Low-Power, 12-Bit
Analog-to-Digital Converter with Internal Reference
Check for Samples: ADS1013 ADS1014 ADS1015
1FEATURES DESCRIPTION
23• ULTRA-SMALL QFN PACKAGE: The ADS1013, ADS1014, and ADS1015 are
2mm × 1,5mm × 0,4mm precision analog-to-digital converters (ADCs) with 12
bits of resolution offered in an ultra-small, leadless
• WIDE SUPPLY RANGE: 2.0V to 5.5V QFN-10 package or an MSOP-10 package. The
• LOW CURRENT CONSUMPTION: ADS1013/4/5 are designed with precision, power, and
Continuous Mode: Only 150μAease of implementation in mind. The ADS1013/4/5
Single-Shot Mode: Auto Shut-Down feature an onboard reference and oscillator. Data are
• PROGRAMMABLE DATA RATE: transferred via an I2C-compatible serial interface; four
I2C slave addresses can be selected. The
128SPS to 3.3kSPS ADS1013/4/5 operate from a single power supply
• INTERNAL LOW-DRIFT ranging from 2.0V to 5.5V.
VOLTAGE REFERENCE The ADS1013/4/5 can perform conversions at rates
• INTERNAL OSCILLATOR up to 3300 samples per second (SPS). An onboard
• INTERNAL PGA PGA is available on the ADS1014 and ADS1015 that
• I2C™ INTERFACE: Pin-Selectable Addresses offers input ranges from the supply to as low as
±256mV, allowing both large and small signals to be
• FOUR SINGLE-ENDED OR TWO measured with high resolution. The ADS1015 also
DIFFERENTIAL INPUTS (ADS1015) features an input multiplexer (MUX) that provides two
• PROGRAMMABLE COMPARATOR differential or four single-ended inputs.
(ADS1014 and ADS1015) The ADS1013/4/5 operate either in continuous
conversion mode or a single-shot mode that
APPLICATIONS automatically powers down after a conversion and
• PORTABLE INSTRUMENTATION greatly reduces current consumption during idle
• CONSUMER GOODS periods. The ADS1013/4/5 are specified from –40°C
• BATTERY MONITORING to +125°C.
• TEMPERATURE MEASUREMENT
• FACTORY AUTOMATION AND PROCESS
CONTROLS
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2I2C is a trademark of NXP Semiconductors.
3All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Copyright © 2009, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
ADS1013
ADS1014
ADS1015
SBAS473C –MAY 2009–REVISED OCTOBER 2009
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
ORDERING INFORMATION
For the most current package and ordering information, see the Package Option Addendum at the end of this
document, or see the TI web site at www.ti.com.
ABSOLUTE MAXIMUM RATINGS(1)
ADS1013, ADS1014, ADS1015 UNIT
VDD to GND –0.3 to +5.5 V
Analog input current 100, momentary mA
Analog input current 10, continuous mA
Analog input voltage to GND –0.3 to VDD + 0.3 V
SDA, SCL, ADDR, ALERT/RDY voltage to GND –0.5 to +5.5 V
Maximum junction temperature +150 °C
Storage temperature range –60 to +150 °C
(1) Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to absolute
maximum conditions for extended periods may affect device reliability.
PRODUCT FAMILY
PACKAGE INPUT CHANNELS
DESIGNATOR RESOLUTION MAXIMUM SAMPLE (Differential/
DEVICE MSOP/QFN (Bits) RATE (SPS) COMPARATOR PGA Single-Ended)
ADS1113 BROI/N6J 16 860 No No 1/1
ADS1114 BRNI/N5J 16 860 Yes Yes 1/1
ADS1115 BOGI/N4J 16 860 Yes Yes 2/4
ADS1013 BRMI/N9J 12 3300 No No 1/1
ADS1014 BRQI/N8J 12 3300 Yes Yes 1/1
ADS1015 BRPI/N7J 12 3300 Yes Yes 2/4
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ADS1013
ADS1014
ADS1015
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SBAS473C –MAY 2009–REVISED OCTOBER 2009
ELECTRICAL CHARACTERISTICS
All specifications at –40°C to +125°C, VDD = 3.3V, and Full-Scale (FS) = ±2.048V, unless otherwise noted.
Typical values are at +25°C. ADS1013, ADS1014, ADS1015
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ANALOG INPUT
Full-scale input voltage(1) VIN = (AINP) – (AINN) ±4.096/PGA V
Analog input voltage AINPor AINNto GND GND VDD V
Differential input impedance See Table 2
FS = ±6.144V(1) 10 MΩ
FS = ±4.096V(1), ±2.048V 6 MΩ
Common-mode input impedance FS = ±1.024V 3 MΩ
FS = ±0.512V, ±0.256V 100 MΩ
SYSTEM PERFORMANCE
Resolution No missing codes 12 Bits
128, 250,
490, 920,
Data rate (DR) SPS
1600, 2400,
3300
Data rate variation All data rates –10 10 %
Output noise See Typical Characteristics
Integral nonlinearity DR = 128SPS, FS = ±2.048V, best fit(2) 0.5 LSB
FS = ±2.048V, differential inputs 0 ±0.5 LSB
Offset error FS = ±2.048V, single-ended inputs ±0.25 LSB
Offset drift FS = ±2.048V 0.005 LSB/°C
Gain error(3) FS = ±2.048V at 25°C 0.05 0.25 %
FS = ±0.256V 7 ppm/°C
Gain drift(3) FS = ±2.048V 5 40 ppm/°C
FS = ±6.144V(1) 5 ppm/°C
PGA gain match(3) Match between any two PGA gains 0.02 0.1 %
Gain match Match between any two inputs 0.05 0.1 %
Offset match Match between any two inputs 0.25 LSB
DIGITAL INPUT/OUTPUT
Logic level
VIH 0.7VDD 5.5 V
VIL GND – 0.5 0.3VDD V
VOL IOL = 3mA GND 0.15 0.4 V
Input leakage
IHVIH = 5.5V 10 μA
ILVIL = GND 10 μA
(1) This parameter expresses the full-scale range of the ADC scaling. In no event should more than VDD + 0.3V be applied to this device.
(2) 99% of full-scale.
(3) Includes all errors from onboard PGA and reference.
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Product Folder Link(s): ADS1013 ADS1014 ADS1015
1
2
3
4
5
10
9
8
7
6
ADDR
ALERT/RDY (ADS1014/5Only)
GND
AIN0
AIN1
SCL
SDA
VDD
AIN3 (ADS1015Only)
AIN2 (ADS1015Only)
ADS1013
ADS1014
ADS1015
DGSPACKAGE
MSOP-10
(TOPVIEW)
5
10
1
2
3
4
ADDR
ALERT/RDY(ADS1014/5Only)
GND
AIN0
AIN1
SCL
9
8
7
6
SDA
VDD
AIN3 (ADS1015Only)
AIN2 (ADS1015Only)
ADS1013
ADS1014
ADS1015
RUGPACKAGE
QFN-10
(TOPVIEW)
ADS1013
ADS1014
ADS1015
SBAS473C –MAY 2009–REVISED OCTOBER 2009
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ELECTRICAL CHARACTERISTICS (continued)
All specifications at –40°C to +125°C, VDD = 3.3V, and Full-Scale (FS) = ±2.048V, unless otherwise noted.
Typical values are at +25°C.
ADS1013, ADS1014, ADS1015
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
POWER-SUPPLY REQUIREMENTS
Power-supply voltage 2 5.5 V
Power-down current at 25°C 0.5 2 μA
Power-down current up to 125°C 5 μA
Supply current Operating current at 25°C 150 200 μA
Operating current up to 125°C 300 μA
VDD = 5.0V 0.9 mW
Power dissipation VDD = 3.3V 0.5 mW
VDD = 2.0V 0.3 mW
TEMPERATURE
Storage temperature –60 +150 °C
Specified temperature –40 +125 °C
PIN CONFIGURATIONS
PIN DESCRIPTIONS
DEVICE
PIN # ADS1013 ADS1014 ADS1015 FUNCTION DESCRIPTION
1 ADDR ADDR ADDR Digital input I2C slave address select
2 NC(1) ALERT/RDY ALERT/RDY Digital output Digital comparator output or conversion ready (NC for ADS1013)
3 GND GND GND Supply Ground
4 AIN0 AIN0 AIN0 Analog input Differential channel 1: Positive input or single-ended channel 1 input
5 AIN1 AIN1 AIN1 Analog input Differential channel 1: Negative input or single-ended channel 2 input
6 NC NC AIN2 Analog input Differential channel 2: Positive input or single-ended channel 3 input (NC for ADS1013/4)
Differential channel 2: Negative input or single-ended channel 4 input
7 NC NC AIN3 Analog input (NC for ADS1013/4)
8 VDD VDD VDD Supply Power supply: 2.0V to 5.5V
9 SDA SDA SDA Digital I/O Serial data: Transmits and receives data
10 SCL SCL SCL Digital input Serial clock input: Clocks data on SDA
(1) NC pins may be left floating or tied to ground.
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Product Folder Link(s): ADS1013 ADS1014 ADS1015
SCL
SDA
tLOW tRtFtHDSTA
tHDSTA
tHDDAT
tBUF
tSUDAT
tHIGH tSUSTA tSUSTO
P S S P
ADS1013
ADS1014
ADS1015
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SBAS473C –MAY 2009–REVISED OCTOBER 2009
TIMING REQUIREMENTS
Figure 1. I2C Timing Diagram
Table 1. I2C Timing Definitions
FAST MODE HIGH-SPEED MODE
PARAMETER MIN MAX MIN MAX UNIT
SCL operating frequency fSCL 0.01 0.4 0.01 3.4 MHz
Bus free time between START and STOP tBUF 600 160 ns
condition
Hold time after repeated START condition. tHDSTA 600 160 ns
After this period, the first clock is generated.
Repeated START condition setup time tSUSTA 600 160 ns
Stop condition setup time tSUSTO 600 160 ns
Data hold time tHDDAT 0 0 ns
Data setup time tSUDAT 100 10 ns
SCL clock low period tLOW 1300 160 ns
SCL clock high period tHIGH 600 60 ns
Clock/data fall time tF300 160 ns
Clock/data rise time tR300 160 ns
Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Link(s): ADS1013 ADS1014 ADS1015
300
250
200
150
100
50
0
OperatingCurrent( A)m
-40 -20 0 20 40 60 80 100 120 140
Temperature(°C)
VDD =5V
VDD =2V VDD =3.3V
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
ShutdownCurrent( A)m
-40 -20 0 20 40 60 80 100 120 140
Temperature(°C)
VDD =3.3V
VDD =2V
VDD =5V
150
100
50
0
50
100
150
200
250
300
-
-
-
-
-
-
OffsetError( V)m
-40 -20 0 20 40 60 80 100 120 140
Temperature( C)°
VDD=2V
FS= 4.096V±(1)
FS= 2.048V±
FS= 1.024V±
FS= 0.512V±
VDD=5V
60
50
40
30
20
10
0
10
20
-
-
OffsetVoltage( V)m
-40 -20 0 20 40 60 80 100 120 140
Temperature(°C)
VDD =3V
VDD =2V
VDD =5V
VDD =4V
0.05
0.04
0.03
0.02
0.01
0
0.01
0.02
0.03
0.04
-
-
-
-
GainError(%)
-40 -20 0 20 40 60 80 100 120 140
Temperature(°C)
FS= 0.512V±
FS= 0.256V±
FS= 1.024V, 2.048V,
4.096V ,and 6.144V
± ±
± ±
(1) (1)
4
3
2
1
0
1
2
3
4
-
-
-
-
OutputCode(LSBs)
02000 4000 6000 8000 10000 12000 14000
ReadingNumber
DR=3300SPS
FS= 2.048V
14kSamples
±
ADS1013
ADS1014
ADS1015
SBAS473C –MAY 2009–REVISED OCTOBER 2009
www.ti.com
TYPICAL CHARACTERISTICS
At TA= +25°C and VDD = 3.3V, unless otherwise noted.
OPERATING CURRENT vs TEMPERATURE SHUTDOWN CURRENT vs TEMPERATURE
Figure 2. Figure 3.
SINGLE-ENDED OFFSET ERROR vs TEMPERATURE(1) DIFFERENTIAL OFFSET vs TEMPERATURE
Figure 4. Figure 5.
GAIN ERROR vs TEMPERATURE NOISE PLOT
Figure 6. Figure 7.
(1) This parameter expresses the full-scale range of the ADC scaling. In no event should more than VDD + 0.3V be applied to this device.
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Product Folder Link(s): ADS1013 ADS1014 ADS1015
12-Bit
ADC
DS I C
Interface
2
Voltage
Reference
Oscillator
ALERT/RDY
SCL
SDA
ADDR
Gain=2/3, 1,
2,4,8,or16
PGA
Comparator
ADS1015
AIN1
AIN2
GND
AIN0
AIN3
VDD
MUX
ADS1013
ADS1014
ADS1015
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SBAS473C –MAY 2009–REVISED OCTOBER 2009
OVERVIEW
of a differential, switched-capacitor ΔΣ modulator
The ADS1013/4/5 are very small, low-power, 12-bit, followed by a digital filter. Input signals are compared
delta-sigma (ΔΣ) analog-to-digital converters (ADCs). to the internal voltage reference. The digital filter
The ADS1013/4/5 are extremely easy to configure receives a high-speed bitstream from the modulator
and design into a wide variety of applications, and and outputs a code proportional to the input voltage.
allow precise measurements to be obtained with very
little effort. Both experienced and novice users of The ADS1013/4/5 have two available conversion
data converters find designing with the ADS1013/4/5 modes: single-shot mode and continuous conversion
family to be intuitive and problem-free. mode. In single-shot mode, the ADC performs one
conversion of the input signal upon request and
The ADS1013/4/5 consist of a ΔΣ analog-to-digital stores the value to an internal result register. The
(A/D) core with adjustable gain (excludes the device then enters a low-power shutdown mode. This
ADS1013), an internal voltage reference, a clock mode is intended to provide significant power savings
oscillator, and an I2C interface. An additional feature in systems that only require periodic conversions or
available on the ADS1014/5 is a programmable digital when there are long idle periods between
comparator that provides an alert on a dedicated pin. conversions. In continuous conversion mode, the
All of these features are intended to reduce required ADC automatically begins a conversion of the input
external circuitry and improve performance. Figure 8 signal as soon as the previous conversion is
shows the ADS1015 functional block diagram. completed. The rate of continuous conversion is
equal to the programmed data rate. Data can be read
The ADS1013/4/5 A/D core measures a differential at any time and always reflect the most recent
signal, VIN, that is the difference of AINPand AINN. A completed conversion.
MUX is available on the ADS1015. This architecture
results in a very strong attenuation of any
common-mode signals. The converter core consists
Figure 8. ADS1015 Functional Block Diagram
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Product Folder Link(s): ADS1013 ADS1014 ADS1015
VDD
GND
SCL
SDA
ADDR
A T
(ADS1014/5Only)
LER
AIN0
AIN1
AIN2(ADS1015Only)
AIN3(ADS1015Only) SCL
SDA
1 F00n
I C-Capabl Mastere
( )MSP430
2
ADS1 13/4/0 5
+3.3V
VDD
GND
1 F00n
+3.3V
JTAG Serial AR/U T
+3.3V
10kW10kW
ADS1013
ADS1014
ADS1015
SBAS473C –MAY 2009–REVISED OCTOBER 2009
www.ti.com
QUICKSTART GUIDE For example, to write to the configuration register to
set the ADS1013/4/5 to continuous conversion mode
This section provides a brief example of ADS1013/4/5 and then read the conversion result, send the
communications. Refer to subsequent sections of this following bytes in this order:
data sheet for more detailed explanations. Hardware
for this design includes: one ADS1013/4/5 configured Write to Config register:
with an I2C address of 1001000; a microcontroller First byte: 0b10010000 (first 7-bit I2C address
with an I2C interface (TI recommends the MSP430 followed by a low read/write bit)
product line); discrete components such as resistors,
capacitors, and serial connectors; and a 2V to 5V Second byte: 0b00000001 (points to Config register)
power supply. Figure 9 shows the basic hardware Third byte: 0b00000100 (MSB of the Config register
configuration. to be written)
The ADS1013/4/5 communicate with the master Fourth byte: 0b10000011 (LSB of the Config register
(microcontroller) through an I2C interface. The master to be written)
provides a clock signal on the SCL pin and data are
transferred via the SDA pin. The ADS1013/4/5 never Write to Pointer register:
drive the SCL pin. For information on programming First byte: 0b10010000 (first 7-bit I2C address
and debugging the microcontroller being used, refer followed by a low read/write bit)
to the device-specific product data sheet. Second byte: 0b00000000 (points to Conversion
The first byte sent by the master should be the register)
ADS1013/4/5 address followed by a bit that instructs
the ADS1013/4/5 to listen for a subsequent byte. The Read Conversion register:
second byte is the register pointer. Refer to Table 6 First byte: 0b10010001 (first 7-bit I2C address
for a register map. The third and fourth bytes sent followed by a high read/write bit)
from the master are written to the register indicated in
the second byte. Refer to Figure 16 and Figure 17 for Second byte: the ADS1013/4/5 response with the
read and write operation timing diagrams, MSB of the Conversion register
respectively. All read and write transactions with the Third byte: the ADS1013/4/5 response with the LSB
ADS1013/4/5 must be preceded by a start condition of the Conversion register
and followed by a stop condition.
Figure 9. Basic Hardware Configuration
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VDD
GND
AIN0
VDD
GND
AIN1
VDD
GND
AIN2
VDD
GND
AIN3
AINP
AINN
GND
ADS1015
tSAMPLE
ON
OFF
S1
S2
OFF
ON
ADS1013
ADS1014
ADS1015
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SBAS473C –MAY 2009–REVISED OCTOBER 2009
MULTIPLEXER If it is possible that the voltages on the input pins may
violate these conditions, external Schottky clamp
The ADS1015 contains an input multiplexer, as diodes and/or series resistors may be required to limit
shown in Figure 10. Either four single-ended or two the input current to safe values (see the Absolute
differential signals can be measured. Additionally, Maximum Ratings table).
AIN0 and AIN1 may be measured differentially to
AIN3. The multiplexer is configured by three bits in Also, overdriving one unused input on the ADS1015
the Config register. When single-ended signals are may affect conversions taking place on other input
measured, the negative input of the ADC is internally pins. If overdrive on unused inputs is possible, again
connected to GND by a switch within the multiplexer. it is recommended to clamp the signal with external
Schottky diodes.
ANALOG INPUTS
The ADS1013/4/5 use a switched-capacitor input
stage where capacitors are continuously charged and
then discharged to measure the voltage between
AINPand AINN. The capacitors used are small, and to
external circuitry the average loading appears
resistive. This structure is shown in Figure 12. The
resistance is set by the capacitor values and the rate
at which they are switched. Figure 11 shows the
on/off setting of the switches illustrated in Figure 12.
During the sampling phase, S1switches are closed.
This event charges CA1 to AINP, CA2 to AINN, and CB
to (AINP– AINN). During the discharge phase, S1is
first opened and then S2is closed. Both CA1 and CA2
then discharge to approximately 0.7V and CB
discharges to 0V. This charging draws a very small
transient current from the source driving the
Figure 10. ADS1015 MUX ADS1013/4/5 analog inputs. The average value of
this current can be used to calculate the effective
The ADS1013 and ADS1014 do not have a impedance (Reff) where Reff = VIN/IAVERAGE.
multiplexer. Either one differential or one
single-ended signal may be measured with these
devices. For single-ended measurements, connect
the AIN1 pin to GND. Note that in subsequent
sections of this data sheet, AINPrefers to AIN0 and
AINNrefers to AIN1 for the ADS1013 and ADS1014.
When measuring single-ended inputs it is important to
note that the negative range of the output codes are
not used. These codes are for measuring negative Figure 11. S1and S2Switch Timing for Figure 12
differential signals such as (AINP– AINN) < 0. ESD
diodes to VDD and GND protect the inputs on all
three devices (ADS1013, ADS1014, and ADS1015).
To prevent the ESD diodes from turning on, the
absolute voltage on any input must stay within the
following range:
GND – 0.3V < AINx < VDD + 0.3V
Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 9
Product Folder Link(s): ADS1013 ADS1014 ADS1015
Equivalent
Circuit
f =250kHz
CLK
ZCM
ZDIFF
ZCM
AINN
AINP
0.7V
0.7V
S1
S1
CA1
CB
CA2
S2
S2
0.7V
0.7V
AINN
AINP
ADS1013
ADS1014
ADS1015
SBAS473C –MAY 2009–REVISED OCTOBER 2009
www.ti.com
Figure 12. Simplified Analog Input Circuit
The common-mode input impedance is measured by The typical value of the input impedance cannot be
applying a common-mode signal to shorted AINPand neglected. Unless the input source has a low
AINNinputs and measuring the average current impedance, the ADS1013/4/5 input impedance may
consumed by each pin. The common-mode input affect the measurement accuracy. For sources with
impedance changes depending on the PGA gain high output impedance, buffering may be necessary.
setting, but is approximately 6MΩfor the default PGA Active buffers introduce noise, and also introduce
gain setting. In Figure 12, the common-mode input offset and gain errors. All of these factors should be
impedance is ZCM. considered in high-accuracy applications.
The differential input impedance is measured by Because the clock oscillator frequency drifts slightly
applying a differential signal to AINPand AINNinputs with temperature, the input impedances also drift. For
where one input is held at 0.7V. The current that many applications, this input impedance drift can be
flows through the pin connected to 0.7V is the ignored, and the values given in Table 2 for typical
differential current and scales with the PGA gain input impedance are valid.
setting. In Figure 12, the differential input impedance
is ZDIFF.Table 2 describes the typical differential input FULL-SCALE INPUT
impedance. A programmable gain amplifier (PGA) is implemented
before the ΔΣ core of the ADS1014/5. The PGA can
Table 2. Differential Input Impedance be set to gains of 2/3, 1, 2, 4, 8, and 16. Table 3
FS (V) DIFFERENTIAL INPUT IMPEDANCE shows the corresponding full-scale (FS) ranges. The
±6.144V(1) 22MΩPGA is configured by three bits in the Config register.
The ADS1013 has a fixed full-scale input range of
±4.096V(1) 15MΩ±2.048V. The PGA = 2/3 setting allows input
±2.048V 4.9MΩmeasurement to extend up to the supply voltage
±1.024V 2.4MΩwhen VDD is larger than 4V. Note though that in this
±0.512V 710kΩcase (as well as for PGA = 1 and VDD < 4V), it is not
±0.256V 710kΩpossible to reach a full-scale output code on the
ADC. Analog input voltages may never exceed the
1. This parameter expresses the full-scale range of analog input voltage limits given in the Electrical
the ADC scaling. In no event should more than Characteristics table.
VDD + 0.3V be applied to this device. Table 3. PGA Gain Full-Scale Range
PGA SETTING FS (V)
2/3 ±6.144V(1)
1 ±4.096V(1)
2 ±2.048V
4 ±1.024V
8 ±0.512V
16 ±0.256V
1. This parameter expresses the full-scale range of
the ADC scaling. In no event should more than
VDD + 0.3V be applied to this device.
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Product Folder Link(s): ADS1013 ADS1014 ADS1015
0x7FF0
OutputCode
-FS ¼0¼FS
InputVoltage(AIN AIN )-
P N
0x7FE0
0x0001
¼
0x0000
0x8000
0xFFF0
0x8010
¼
-FS
2-1
11
211 FS
2-1
11
211
ADS1013
ADS1014
ADS1015
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SBAS473C –MAY 2009–REVISED OCTOBER 2009
DATA FORMAT The ADS1013/4/5 digital filter provides some
attenuation of high-frequency noise, but the digital
The ADS1013/4/5 provide 12 bits of data in binary Sinc filter frequency response cannot completely
twos complement format. The positive full-scale input replace an anti-aliasing filter. For a few applications,
produces an output code of 7FF0h and the negative some external filtering may be needed; in such
full-scale input produces an output code of 8000h. instances, a simple RC filter is adequate.
The output clips at these codes for signals that
exceed full-scale. Table 4 summarizes the ideal When designing an input filter circuit, be sure to take
output codes for different input signals. Figure 13 into account the interaction between the filter network
shows code transitions versus input voltage. and the input impedance of the ADS1013/4/5.
Table 4. Input Signal versus Ideal Output Code OPERATING MODES
INPUT SIGNAL, VIN The ADS1013/4/5 operate in one of two modes:
(AINP– AINN) IDEAL OUTPUT CODE(1) continuous conversion or single-shot. In continuous
≥FS (211 – 1)/211 7FF0h conversion mode, the ADS1013/4/5 continuously
+FS/211 0010h perform conversions. Once a conversion has been
completed, the ADS1013/4/5 place the result in the
0 0 Conversion register and immediately begins another
–FS/211 FFF0h conversion. In single-shot mode, the ADS1013/4/5
≤–FS 8000h wait until the OS bit is set high. Once asserted, the bit
is set to '0', indicating that a conversion is currently in
1. Excludes the effects of noise, INL, offset, and progress. Once conversion data are ready, the OS bit
gain errors. reasserts and the device powers down. Writing a '1'
to the OS bit during a conversion has no effect.
RESET AND POWER-UP
When the ADS1013/4/5 powers up, a reset is
performed. As part of the reset process, the
ADS1013/4/5 set all of the bits in the Config register
to the respective default settings.
The ADS1013/4/5 respond to the I2C general call
reset command. When the ADS1013/4/5 receive a
general call reset, an internal reset is performed as if
the device had been powered on.
DUTY CYCLING FOR LOW POWER
For many applications, the improved performance at
low data rates may not be required. For these
applications, the ADS1013/4/5 support duty cycling
Figure 13. ADS1013/4/5 Code Transition Diagram that can yield significant power savings by
periodically requesting high data rate readings at an
effectively lower data rate. For example, an
ALIASING ADS1013/4/5 in power-down mode with a data rate
As with any data converter, if the input signal set to 3300SPS could be operated by a
contains frequencies greater than half the data rate, microcontroller that instructs a single-shot conversion
aliasing occurs. To prevent aliasing, the input signal every 7.8ms (128SPS). Because a conversion at
must be bandlimited. Some signals are inherently 3300SPS only requires about 0.3ms, the
bandlimited. For example, the output of a ADS1013/4/5 enter power-down mode for the
thermocouple, which has a limited rate of change. remaining 7.5ms. In this configuration, the
Nevertheless, they can contain noise and interference ADS1013/4/5 consume about 1/25th the power of the
components. These components can fold back into ADS1013/4/5 operated in continuous conversion
the sampling band in the same way as with any other mode. The rate of duty cycling is completely arbitrary
signal. and is defined by the master controller. The
ADS1013/4/5 offer lower data rates that do not
implement duty cycling and offer improved noise
performance if it is needed.
Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 11
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TH_H
TH_L
Time
Time
Time
Successful
SMBusAlert
Response
Latching
Comparator
Output
Non-Latching
Comparator
Output
InputSignal
TH_H
TH_L
Time
Time
Time
Successful
SMBusAlert
Response
Successful
SMBusAlert
Response
Latching
Comparator
Output
Non-Latching
Comparator
Output
InputSignal
ADS1013
ADS1014
ADS1015
SBAS473C –MAY 2009–REVISED OCTOBER 2009
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COMPARATOR (ADS1014/15 ONLY)
The ADS1014/5 are each equipped with a
customizable comparator that can issue an alert on
the ALERT/RDY pin. This feature can significantly
reduce external circuitry for many applications. The
comparator can be implemented as either a
traditional comparator or a window comparator via the
COMP_MODE bit in the Config register. When
implemented as a traditional comparator, the
ALERT/RDY pin asserts (active low by default) when
conversion data exceed the limit set in the high
threshold register. The comparator then deasserts
when the input signal falls below the low threshold
register value. In window comparator mode, the
ALERT/RDY pin asserts if conversion data exceed
the high threshold register or fall below the low
threshold register.
In either window or traditional comparator mode, the
comparator can be configured to latch once asserted
by the COMP_LAT bit in the Config register. This
setting causes the assertion to remain even if the
input signal is not beyond the bounds of the threshold
registers. This latched assertion can be cleared by
issuing an SMBus alert response or by reading the
Conversion register. The COMP_POL bit in the
Config register configures the ALERT/RDY pin as Figure 14. Alert Pin Timing Diagram When
active high or active low. Operational diagrams for Configured as a Traditional Comparator
the comparator modes are shown in Figure 14 and
Figure 15.
The comparator can be configured to activate the
ALERT/RDY pin after a set number of successive
readings exceed the threshold. The comparator can
be configured to wait for one, two, or four readings
beyond the threshold before activating the
ALERT/RDY pin by changing the COMP_QUE bits in
the Config register. The COMP_QUE bits can also
disable the comparator function.
CONVERSION READY PIN (ADS1014/5 ONLY)
The ALERT/RDY pin can also be configured as a
conversion ready pin. This mode of operation can be
realized if the MSB of the high threshold register is
set to '1' and the MSB of the low threshold register is
set to '0'. The COMP_POL bit continues to function
and the COMP_QUE bits can disable the pin;
however, the COMP_MODE and COMP_LAT bits no
longer control any function. When configured as a
conversion ready pin, ALERT/RDY continues to
require a pull-up resistor. When in continuous
conversion mode, the ADS1013/4/5 provide a brief
(~8µs) pulse on the ALERT/RDY pin at the end of
each conversion. When in single-shot shutdown
mode, the ALERT/RDY pin asserts low at the end of
a conversion if the COMP_POL bit is set to '0'. Figure 15. Alert Pin Timing Diagram When
Configured as a Window Comparator
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SBAS473C –MAY 2009–REVISED OCTOBER 2009
SMBus ALERT RESPONSE An I2C bus consists of two lines, SDA and SCL. SDA
carries data; SCL provides the clock. All data are
When configured in latching mode (COMP_LAT = '1' transmitted across the I2C bus in groups of eight bits.
in the Config register), the ALERT/RDY pin can be To send a bit on the I2C bus, the SDA line is driven to
implemented with an SMBus alert. The pin asserts if the appropriate level while SCL is low (a low on SDA
the comparator detects a conversion that exceeds an indicates the bit is zero; a high indicates the bit is
upper or lower threshold. This interrupt is latched and one). Once the SDA line settles, the SCL line is
can be cleared only by reading conversion data, or by brought high, then low. This pulse on SCL clocks the
issuing a successful SMBus alert response and SDA bit into the receiver shift register. If the I2C bus
reading the asserting device I2C address. If is held idle for more than 25ms, the bus times out.
conversion data exceed the upper or lower thresholds
after being cleared, the pin reasserts. This assertion The I2C bus is bidirectional: the SDA line is used for
does not affect conversions that are already in both transmitting and receiving data. When the
progress. The ALERT/RDY pin, as with the SDA pin, master reads from a slave, the slave drives the data
is an open-drain pin. This architecture allows several line; when the master sends to a slave, the master
devices to share the same interface bus. When drives the data line. The master always drives the
disabled, the pin holds a high state so that it does not clock line. The ADS1013/4/5 never drive SCL,
interfere with other devices on the same bus line. because they cannot act as a master. On the
ADS1013/4/5, SCL is an input only.
When the master senses that the ALERT/RDY pin
has latched, it issues an SMBus alert command Most of the time the bus is idle; no communication
(00011001) to the I2C bus. Any ADS1014/5 data occurs, and both lines are high. When communication
converters on the I2C bus with the ALERT/RDY pins is taking place, the bus is active. Only master devices
asserted respond to the command with the slave can start a communication and initiate a START
address. This sequence is illustrated in Figure 18. In condition on the bus. Normally, the data line is only
the event that two or more ADS1014/5 data allowed to change state while the clock line is low. If
converters present on the bus assert the latched the data line changes state while the clock line is
ALERT/RDY pin, arbitration during the address high, it is either a START condition or a STOP
response portion of the SMBus alert decides which condition. A START condition occurs when the clock
device clears its assertion. The device with the lowest line is high and the data line goes from high to low. A
I2C address always wins arbitration. If a device loses STOP condition occurs when the clock line is high
arbitration, it does not clear the comparator output pin and the data line goes from low to high.
assertion. The master then repeats the SMBus alert After the master issues a START condition, it sends a
response until all devices have had the respective byte that indicates which slave device it wants to
assertions cleared. In window comparator mode, the communicate with. This byte is called the address
SMBus alert status bit indicates a '1' if signals exceed byte. Each device on an I2C bus has a unique 7-bit
the high threshold and a '0' if signals exceed the low address to which it responds. The master sends an
threshold. address in the address byte, together with a bit that
indicates whether it wishes to read from or write to
I2C INTERFACE the slave device.
The ADS1013/4/5 communicate through an I2CEvery byte transmitted on the I2C bus, whether it is
interface. I2C is a two-wire open-drain interface that address or data, is acknowledged with an
supports multiple devices and masters on a single acknowledge bit. When the master has finished
bus. Devices on the I2C bus only drive the bus lines sending a byte (eight data bits) to a slave, it stops
low by connecting them to ground; they never drive driving SDA and waits for the slave to acknowledge
the bus lines high. Instead, the bus wires are pulled the byte. The slave acknowledges the byte by pulling
high by pull-up resistors, so the bus wires are high SDA low. The master then sends a clock pulse to
when no device is driving them low. This way, two clock the acknowledge bit. Similarly, when the master
devices cannot conflict; if two devices drive the bus has finished reading a byte, it pulls SDA low to
simultaneously, there is no driver contention. acknowledge this to the slave. It then sends a clock
pulse to clock the bit. (The master always drives the
Communication on the I2C bus always takes place clock line.)
between two devices, one acting as the master and
the other as the slave. Both masters and slaves can Anot-acknowledge is performed by simply leaving
read and write, but slaves can only do so under the SDA high during an acknowledge cycle. If a device is
direction of the master. Some I2C devices can act as not present on the bus, and the master attempts to
masters or slaves, but the ADS1013/4/5 can only act address it, it receives a not-acknowledge because no
as slave devices. device is present at that address to pull the line low.
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When the master has finished communicating with a byte; the I2C specification prohibits acknowledgment
slave, it may issue a STOP condition. When a STOP of the Hs master code. Upon receiving a master
condition is issued, the bus becomes idle again. The code, the ADS1013/4/5 switch on Hs mode filters,
master may also issue another START condition. and communicate at up to 3.4MHz. The ADS1013/4/5
When a START condition is issued while the bus is switch out of Hs mode with the next STOP condition.
active, it is called a repeated START condition. For more information on high-speed mode, consult
See the Timing Requirements section for a timing the I2C specification.
diagram showing the ADS1013/4/5 I2C transaction. SLAVE MODE OPERATIONS
I2C ADDRESS SELECTION The ADS1013/4/5 can act as either slave receivers or
The ADS1013/4/5 have one address pin, ADDR, that slave transmitters. As a slave device, the
sets the I2C address. This pin can be connected to ADS1013/4/5 cannot drive the SCL line.
ground, VDD, SDA, or SCL, allowing four addresses
to be selected with one pin as shown in Table 5. The Receive Mode:
state of the address pin ADDR is sampled In slave receive mode the first byte transmitted from
continuously. the master to the slave is the address with the R/W
bit low. This byte allows the slave to be written to.
Table 5. ADDR Pin Connection and The next byte transmitted by the master is the
Corresponding Slave Address register pointer byte. The ADS1013/4/5 then
ADDR PIN SLAVE ADDRESS acknowledge receipt of the register pointer byte. The
Ground 1001000 next two bytes are written to the address given by the
register pointer. The ADS1013/4/5 acknowledge each
VDD 1001001 byte sent. Register bytes are sent with the most
SDA 1001010 significant byte first, followed by the least significant
SCL 1001011 byte.
I2C GENERAL CALL Transmit Mode:
The ADS1013/4/5 respond to the I2C general call In slave transmit mode, the first byte transmitted by
address (0000000) if the eighth bit is '0'. The devices the master is the 7-bit slave address followed by the
acknowledge the general call address and respond to high R/W bit. This byte places the slave into transmit
commands in the second byte. If the second byte is mode and indicates that the ADS1013/4/5 are being
00000110 (06h), the ADS1013/4/5 reset the internal read from. The next byte transmitted by the slave is
registers and enter power-down mode. the most significant byte of the register that is
indicated by the register pointer. This byte is followed
by an acknowledgment from the master. The
I2C SPEED MODES remaining least significant byte is then sent by the
The I2C bus operates at one of three speeds. slave and is followed by an acknowledgment from the
Standard mode allows a clock frequency of up to master. The master may terminate transmission after
100kHz; fast mode permits a clock frequency of up to any byte by not acknowledging or issuing a START or
400kHz; and high-speed mode (also called Hs mode) STOP condition.
allows a clock frequency of up to 3.4MHz. The
ADS1013/4/5 are fully compatible with all three WRITING/READING THE REGISTERS
modes. To access a specific register from the ADS1013/4/5,
No special action is required to use the ADS1013/4/5 the master must first write an appropriate value to the
in standard or fast mode, but high-speed mode must Pointer register. The Pointer register is written directly
be activated. To activate high-speed mode, send a after the slave address byte, low R/W bit, and a
special address byte of 00001xxx following the successful slave acknowledgment. After the Pointer
START condition, where xxx are bits unique to the register is written, the slave acknowledges and the
Hs-capable master. This byte is called the Hs master master issues a STOP or a repeated START
code. (Note that this is different from normal address condition.
bytes; the eighth bit does not indicate read/write
status.) The ADS1013/4/5 do not acknowledge this
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SBAS473C –MAY 2009–REVISED OCTOBER 2009
When reading from the ADS1013/4/5, the previous POINTER REGISTER
value written to the Pointer register determines the The four registers are accessed by writing to the
register that is read from. To change which register is Pointer register byte; see Figure 16.Table 6 and
read, a new value must be written to the Pointer Table 7 indicate the Pointer register byte map.
register. To write a new value to the Pointer register,
the master issues a slave address byte with the R/W Table 6. Register Address
bit low, followed by the Pointer register byte. No BIT 1 BIT 0 REGISTER
additional data need to be transmitted, and a STOP
condition can be issued by the master. The master 0 0 Conversion register
may now issue a START condition and send the 0 1 Config register
slave address byte with the R/W bit high to begin the 1 0 Lo_thresh register
read. Figure 16 details this sequence. If repeated 1 1 Hi_thresh register
reads from the same register are desired, there is no
need to continually send Pointer register bytes,
because the ADS1013/4/5 store the value of the CONVERSION REGISTER
Pointer register until it is modified by a write The 16-bit register contains the result of the last
operation. However, every write operation requires conversion in binary twos complement format.
the Pointer register to be written. Following reset or power-up, the Conversion register
is cleared to '0', and remains '0' until the first
REGISTERS conversion is completed.
The ADS1013/4/5 have four registers that are The register format is shown in Table 8.
accessible via the I2C port. The Conversion register
contains the result of the last conversion. The Config CONFIG REGISTER
register allows the user to change the ADS1013/4/5
operating modes and query the status of the devices. The 16-bit register can be used to control the
Two registers, Lo_thresh and Hi_thresh, set the ADS1013/4/5 operating mode, input selection, data
threshold values used for the comparator function. rate, PGA settings, and comparator modes. The
register format is shown in Table 9.
Table 7. Pointer Register Byte (Write-Only)
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
0 0 0 0 0 0 Register address
Table 8. Conversion Register (Read-Only)
BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
NAME D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 0
Table 9. Config Register (Read/Write)
BIT 15 14 13 12 11 10 9 8
NAME OS MUX2 MUX1 MUX0 PGA2 PGA1 PGA0 MODE
blank
BIT 7 6 5 4 3 2 1 0
NAME DR2 DR1 DR0 COMP_MODE COMP_POL COMP_LAT COMP_QUE1 COMP_QUE0
Default = 8583h.
Bit [15] OS: Operational status/single-shot conversion start
This bit determines the operational status of the device.
This bit can only be written when in power-down mode.
For a write status:
0 : No effect
1 : Begin a single conversion (when in power-down mode)
For a read status:
0 : Device is currently performing a conversion
1 : Device is not currently performing a conversion
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Bits [14:12] MUX[2:0]: Input multiplexer configuration (ADS1015 only)
These bits configure the input multiplexer. They serve no function on the ADS1013/4.
000 : AINP= AIN0 and AINN= AIN1 (default) 100 : AINP= AIN0 and AINN= GND
001 : AINP= AIN0 and AINN= AIN3 101 : AINP= AIN1 and AINN= GND
010 : AINP= AIN1 and AINN= AIN3 110 : AINP= AIN2 and AINN= GND
011 : AINP= AIN2 and AINN= AIN3 111 : AINP= AIN3 and AINN= GND
Bits [11:9] PGA[2:0]: Programmable gain amplifier configuration (ADS1014 and ADS1015 only)
These bits configure the programmable gain amplifier. They serve no function on the ADS1013.
000 : FS = ±6.144V(1) 100 : FS = ±0.512V
001 : FS = ±4.096V(1) 101 : FS = ±0.256V
010 : FS = ±2.048V (default) 110 : FS = ±0.256V
011 : FS = ±1.024V 111 : FS = ±0.256V
Bit [8] MODE: Device operating mode
This bit controls the current operational mode of the ADS1013/4/5.
0 : Continuous conversion mode
1 : Power-down single-shot mode (default)
Bits [7:5] DR[2:0]: Data rate
These bits control the data rate setting.
000 : 128SPS 100 : 1600SPS (default)
001 : 250SPS 101 : 2400SPS
010 : 490SPS 110 : 3300SPS
011 : 920SPS 111 : 3300SPS
Bit [4] COMP_MODE: Comparator mode (ADS1014 and ADS1015 only)
This bit controls the comparator mode of operation. It changes whether the comparator is implemented as a
traditional comparator (COMP_MODE = '0') or as a window comparator (COMP_MODE = '1'). It serves no
function on the ADS1013.
0 : Traditional comparator with hysteresis (default)
1 : Window comparator
Bit [3] COMP_POL: Comparator polarity (ADS1014 and ADS1015 only)
This bit controls the polarity of the ALERT/RDY pin. When COMP_POL = '0' the comparator output is active
low. When COMP_POL='1' the ALERT/RDY pin is active high. It serves no function on the ADS1013.
0 : Active low (default)
1 : Active high
Bit [2] COMP_LAT: Latching comparator (ADS1014 and ADS1015 only)
This bit controls whether the ALERT/RDY pin latches once asserted or clears once conversions are within the
margin of the upper and lower threshold values. When COMP_LAT = '0', the ALERT/RDY pin does not latch
when asserted. When COMP_LAT = '1', the asserted ALERT/RDY pin remains latched until conversion data
are read by the master or an appropriate SMBus alert response is sent by the master, the device responds with
its address, and it is the lowest address currently asserting the ALERT/RDY bus line. This bit serves no
function on the ADS1013.
0 : Non-latching comparator (default)
1 : Latching comparator
Bits [1:0] COMP_QUE: Comparator queue and disable (ADS1014 and ADS1015 only)
These bits perform two functions. When set to '11', they disable the comparator function and put the
ALERT/RDY pin into a high state. When set to any other value, they control the number of successive
conversions exceeding the upper or lower thresholds required before asserting the ALERT/RDY pin. They
serve no function on the ADS1013.
00 : Assert after one conversion
01 : Assert after two conversions
10 : Assert after four conversions
11 : Disable comparator (default)
(1) This parameter expresses the full-scale range of the ADC scaling. In no event should more than VDD + 0.3V be applied to this device.
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SBAS473C –MAY 2009–REVISED OCTOBER 2009
Lo_thresh AND Hi_thresh REGISTERS register MSB to ‘0’. However, in all other cases, the
Hi_thresh register must be larger than the Lo_thresh
The upper and lower threshold values used by the register. The threshold register formats are shown in
comparator are stored in two 16-bit registers. These Table 10. When set to RDY mode, the ALERT/RDY
registers store values in the same format that the pin outputs the state of the OS bit when in single-shot
output register displays values; that is, they are mode and pulses when in continuous conversion
stored in twos complement format. Because it is mode. Bits [3:0] in both the Lo_thresh and Hi_thresh
implemented as a digital comparator, special registers have no effect on the comparator level
attention should be taken to readjust values thresholds. These bits should be considered as don't
whenever PGA settings are changed. care bits.
A secondary conversion ready function of the
comparator output pin can be realized by setting the
Hi_thresh register MSB to '1' and the Lo_thresh
Table 10. Lo_thresh and Hi_thresh Registers
REGISTER Lo_thresh (Read/Write)
BIT 15 14 13 12 11 10 9 8
NAME Lo_thresh11 Lo_thresh10 Lo_thresh9 Lo_thresh8 Lo_thresh7 Lo_thresh6 Lo_thresh5 Lo_thresh4
blank
BIT 76543210
NAME Lo_thresh3 Lo_thresh2 Lo_thresh1 Lo_thresh0 0 0 0 0
REGISTER Hi_thresh (Read/Write)
BIT 15 14 13 12 11 10 9 8
NAME Hi_thresh11 Hi_thresh10 Hi_thresh9 Hi_thresh8 Hi_thresh7 Hi_thresh6 Hi_thresh5 Hi_thresh4
blank
BIT 76543210
NAME Hi_thresh3 Hi_thresh2 Hi_thresh1 Hi_thresh0 1 1 1 1
Lo_thresh default = 8000h.
Hi_thresh default = 7FFFh.
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Frame1Two-WireSlaveAddressByte Frame2PointerRegisterByte
1
StartBy
Master
ACKBy
ADS1013/4/5
ACKBy
ADS1013/4/5
Frame3Two-WireSlaveAddressByte Frame4DataByte1ReadRegister
StartBy
Master
ACKBy
ADS1013/4/5
ACKBy
Master(2)
From
ADS1013/4/5
1 9 1 9
1 9 1 9
SDA
SCL
0 0 1 R/W 0 0 0 0 0 0 P1 P0
¼
¼
¼
SDA
(Continued)
SCL
(Continued)
SDA
(Continued)
SCL
(Continued)
1 0 0 1
0A1(1) A0(1)
0A1(1) A0(1) R/W D15 D14 D13 D12 D11 D10 D9 D8
Frame5DataByte2ReadRegister
StopBy
Master
ACKBy
Master(3)
From
ADS1013/4/5
19
D7 D6 D5 D4 D3 D2 D1 D0
StopBy
Master
ADS1013
ADS1014
ADS1015
SBAS473C –MAY 2009–REVISED OCTOBER 2009
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(1) The values of A0 and A1 are determined by the ADDR pin.
(2) Master can leave SDA high to terminate a single-byte read operation.
(3) Master can leave SDA high to terminate a two-byte read operation.
Figure 16. Two-Wire Timing Diagram for Read Word Format
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Frame1Two-WireSlaveAddressByte Frame2PointerRegisterByte
Frame4DataByte2
1
StartBy
Master
ACKBy
ADS1013/4/5
ACKBy
ADS1013/4/5
ACKBy
ADS1013/4/5
StopBy
Master
1 9 1
1
D7 D6 D5 D4 D3 D2 D1 D0
9
Frame3DataByte1
ACKBy
ADS1013/4/5
1
D15
SDA
(Continued)
SCL
(Continued)
D14 D13 D12 D11 D10 D9 D8
9
9
SDA
SCL
0 0 1 0 A1(1) A0(1) R/W 0 0 0 0 0 0 P1 P0 ¼
¼
Frame1SMBusALERTResponseAddressByte Frame2SlaveAddressFromADS1015
StartBy
Master
ACKBy
ADS1013/4/5
From
ADS1013/4/5
NACKBy
Master
StopBy
Master
1 9 1 9
SDA
SCL
ALERT
0 0 0 1 1 0 0 R/W 1 0 0 1 A1 A0
Status
ADS1013
ADS1014
ADS1015
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SBAS473C –MAY 2009–REVISED OCTOBER 2009
(1) The values of A0 and A1 are determined by the ADDR pin.
Figure 17. Two-Wire Timing Diagram for Write Word Format
(1) The values of A0 and A1 are determined by the ADDR pin.
Figure 18. Timing Diagram for SMBus ALERT Response
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0.1 F(typ)m
VDD
VDD
SDA
SCL
GPIO
Microcontrolleror
Microprocessor
withI CPort
2
Pull-UpResistors
1k to10k (typ)W W
5
10
1
2
3
4
ADDR
ALERT/RDY
GND
AIN0
AIN1
SCL
9
8
7
6
SDA
VDD
AIN3
AIN2
ADS1015
InputsSelected
fromConfiguration
Register
ADS1013
ADS1014
ADS1015
SBAS473C –MAY 2009–REVISED OCTOBER 2009
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APPLICATION INFORMATION
The following sections give example circuits and The ADS1013/4/5 interface directly to standard mode,
suggestions for using the ADS1013/4/5 in various fast mode, and high-speed mode I2C controllers. Any
situations. microcontroller I2C peripheral, including master-only
and non-multiple-master I2C peripherals, can operate
with the ADS1013/4/5. The ADS1013/4/5 do not
BASIC CONNECTIONS perform clock-stretching (that is, they never pull the
For many applications, connecting the ADS1013/4/5 clock line low), so it is not necessary to provide for
is simple. A basic connection diagram for the this function unless other clock-stretching devices are
ADS1015 is shown in Figure 19.on the same I2C bus.
The fully differential voltage input of the ADS1013/4/5 Pull-up resistors are required on both the SDA and
is ideal for connection to differential sources with SCL lines because I2C bus drivers are open-drain.
moderately low source impedance, such as The size of these resistors depends on the bus
thermocouples and thermistors. Although the operating speed and capacitance of the bus lines.
ADS1013/4/5 can read bipolar differential signals, Higher-value resistors consume less power, but
they cannot accept negative voltages on either input. increase the transition times on the bus, limiting the
It may be helpful to think of the ADS1013/4/5 positive bus speed. Lower-value resistors allow higher speed
voltage input as noninverting, and of the negative at the expense of higher power consumption. Long
input as inverting. bus lines have higher capacitance and require
smaller pull-up resistors to compensate. The resistors
When the ADS1013/4/5 are converting data, they should not be too small; if they are, the bus drivers
draw current in short spikes. The 0.1μF bypass may not be able to pull the bus lines low.
capacitor supplies the momentary bursts of extra
current needed from the supply.
Figure 19. Typical Connections of the ADS1015
20 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): ADS1013 ADS1014 ADS1015
VDD
GPIO_0
GPIO_1
Microcontrolleror
Microprocessor
withGPIOPorts
5
10
1
2
3
4
ADDR
ALERT/RDY
GND
AIN0
AIN1
SCL
9
8
7
6
SDA
VDD
AIN3
AIN2
ADS1015
ADS1013
ADS1014
ADS1015
www.ti.com
SBAS473C –MAY 2009–REVISED OCTOBER 2009
CONNECTING MULTIPLE DEVICES states. To drive the line low, the pin is set to output
'0'; to let the line go high, the pin is set to input. When
Connecting multiple ADS1013/4/5s to a single bus is the pin is set to input, the state of the pin can be
simple. Using the address pin, the ADS1013/4/5 can read; if another device is pulling the line low, this
be set to one of four different I2C addresses. An configuration reads as a '0' in the port input register.
example showing four ADS1013/4/5 devices is given
in Figure 21. Up to four ADS1013/4/5s (using Note that no pull-up resistor is shown on the SCL
different address pin configurations) can be line. In this simple case, the resistor is not needed;
connected to a single bus. the microcontroller can simply leave the line on
output, and set it to '1' or '0' as appropriate. This
Note that only one set of pull-up resistors is needed action is possible because the ADS1013/4/5 never
per bus. The pull-up resistor values may need to be drive the clock line low. This technique can also be
lowered slightly to compensate for the additional bus used with multiple devices, and has the advantage of
capacitance presented by multiple devices and lower current consumption as a result of the absence
increased line length. of a resistive pull-up.
The TMP421 and DAC8574 devices detect the If there are any devices on the bus that may drive the
respective I2C bus addresses based on the states of clock lines low, this method should not be used; the
pins. In Figure 22, the TMP421 has the address SCL line should be high-Z or '0' and a pull-up resistor
0101010, and the DAC8574 has the address provided as usual.
1001100. Consult the DAC8574 and TMP421 data
sheets, available at www.ti.com, for further details. Some microcontrollers have selectable strong pull-up
circuits built in to the GPIO ports. In some cases,
these circuits can be switched on and used in place
USING GPIO PORTS FOR COMMUNICATION of an external pull-up resistor. Weak pull-ups are also
Most microcontrollers have programmable provided on some microcontrollers, but usually these
input/output (I/O) pins that can be set in software to are too weak for I2C communication. If there is any
act as inputs or outputs. If an I2C controller is not doubt about the matter, test the circuit before
available, the ADS1013/4/5 can be connected to committing it to production.
GPIO pins and the I2C bus protocol simulated, or
bit-banged, in software. An example of this
configuration for a single ADS1013/4/5 is shown in
Figure 20.
Bit-banging I2C with GPIO pins can be done by
setting the GPIO line to '0' and toggling it between
input and output modes to apply the proper bus
NOTE: ADS1013/4/5 power and input connections omitted for clarity.
Figure 20. Using GPIO with a Single ADS1015
Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 21
Product Folder Link(s): ADS1013 ADS1014 ADS1015
VDD
SDA
SCL
Microcontrolleror
Microprocessor
withI CPort
2
I CPull-UpResistors
1k to10k (typ.)W W
2
VDDGND
5
10
1
2
3
4
ADDR
ALERT/RDY
GND
AIN0
AIN1
SCL
9
8
7
6
SDA
VDD
AIN3
AIN2
ADS1015
5
10
1
2
3
4
ADDR
ALERT/RDY
GND
AIN0
AIN1
SCL
9
8
7
6
SDA
VDD
AIN3
AIN2
ADS1015
1
2
3
8
7
6
DXP
DXN
A1
V+
SCL
SDA
TMP421
1
2
3
16
15
14
4
5
6
13
12
11
7
8
10
9
V A
OUT
V B
OUT
V H
REF
A3
A2
A1
VDD
V L
REF
GND
A0
IOVDD
SDA
V C
OUT
V D
OUT
SCL
LDAC
DAC8574
Leave
Floating
4 5
A0 GND
VDD
SDA
SCL
Microcontrolleror
Microprocessor
withI CPort
2
I CPull-UpResistors
1k to10k (typ.)W W
2
VDDGND
5
10
1
2
3
4
ADDR
ALERT/RDY
GND
AIN0
AIN1
SCL
9
8
7
6
SDA
VDD
AIN3
AIN2
ADS1015
5
10
1
2
3
4
ADDR
ALERT/RDY
GND
AIN0
AIN1
SCL
9
8
7
6
SDA
VDD
AIN3
AIN2
ADS1015
5
10
1
2
3
4
ADDR
ALERT/RDY
GND
AIN0
AIN1
SCL
9
8
7
6
SDA
VDD
AIN3
AIN2
ADS1015
5
10
1
2
3
4
ADDR
ALERT/RDY
GND
AIN0
AIN1
SCL
9
8
7
6
SDA
VDD
AIN3
AIN2
ADS1015
ADS1013
ADS1014
ADS1015
SBAS473C –MAY 2009–REVISED OCTOBER 2009
www.ti.com
NOTE: ADS1013/4/5 power and input connections omitted for
clarity. ADDR, A3, A2, A1, and A0 select the I2C addresses.
NOTE: ADS1013/4/5 power and input connections omitted for Figure 22. Connecting Multiple Device Types
clarity. The ADDR pin selects the I2C address.
Figure 21. Connecting Multiple ADS1013/4/5s
22 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): ADS1013 ADS1014 ADS1015
0.1 F(typ)m
VDD
5
10
1
2
3
4
ADDR
ALERT/RDY
GND
AIN0
AIN1
SCL
9
8
7
6
SDA
VDD
AIN3
AIN2
ADS1015
InputsSelected
fromConfiguration
Register
OutputCodes
0 32767-
ADS1013
ADS1014
ADS1015
www.ti.com
SBAS473C –MAY 2009–REVISED OCTOBER 2009
SINGLE-ENDED INPUTS The ADS1015 input range is bipolar differential with
respect to the reference. The single-ended circuit
Although the ADS1015 has two differential inputs, the shown in Figure 23 covers only half the ADS1015
device can easily measure four single-ended signals. input scale because it does not produce differentially
Figure 23 shows a single-ended connection scheme. negative inputs; therefore, one bit of resolution is lost.
The ADS1015 is configured for single-ended
measurement by configuring the MUX to measure
each channel with respect to ground. Data are then
read out of one input based on the selection on the
configuration register. The single-ended signal can
range from 0V to supply. The ADS1015 loses no
linearity anywhere within the input range. Negative
voltages cannot be applied to this circuit because the
ADS1015 can only accept positive voltages.
NOTE: Digital and address pin connections omitted for clarity.
Figure 23. Measuring Single-Ended Inputs
Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 23
Product Folder Link(s): ADS1013 ADS1014 ADS1015
ADS1014
2.0Vto5V
V
3kW
I C
2
1kWR(2)
S
Load
(PGAGain=16)
256mVFS
FS=0.2V
G=4 -5V
R(1)
49.9kW
3
5V
OPA335
0.1 FTypm
ADS1013
ADS1014
ADS1015
SBAS473C –MAY 2009–REVISED OCTOBER 2009
www.ti.com
LOW-SIDE CURRENT MONITOR The ADS1013/4/5 are fabricated in a small-geometry,
low-voltage process. The analog inputs feature
Figure 24 shows a circuit for a low-side shunt-type protection diodes to the supply rails. However, the
current monitor. The circuit monitors the voltage current-handling ability of these diodes is limited, and
across a shunt resistor, which is sized as small as the ADS1013/4/5 can be permanently damaged by
possible while giving a measurable output voltage. analog input voltages that remain more than
This voltage is amplified by an OPA335 low-drift op approximately 300mV beyond the rails for extended
amp, and the result is read by the ADS1014/5. periods. One way to protect against overvoltage is to
place current-limiting resistors on the input lines. The
It is suggested that the ADS1014/5 be operated at a ADS1013/4/5 analog inputs can withstand momentary
gain of 16. The gain of the OPA335 can then be set currents as large as 100mA.
lower. For a gain of 16, the op amp should be set up
to give a maximum output voltage no greater than If the ADS1013/4/5 are driven by an op amp with
0.256V. If the shunt resistor is sized to provide a high-voltage supplies, such as ±12V, protection
maximum voltage drop of 50mV at full-scale current, should be provided, even if the op amp is configured
the full-scale input to the ADS1014/5 is 0.2V. so that it does not output out-of-range voltages. Many
op amps drift to one of the supply rails immediately
when power is applied, usually before the input has
stabilized; this momentary spike can damage the
ADS1013/4/5. This incremental damage results in
slow, long-term failure, which can be disastrous for
permanently installed, low-maintenance systems.
If an op amp or other front-end circuitry is used with
an ADS1013/4/5, performance characteristics must
be taken into account when designing the application.
(1) Pull-down resistor to allow accurate swing to 0V.
(2) RSis sized for a 50mV drop at full-scale current.
Figure 24. Low-Side Current Measurement
24 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): ADS1013 ADS1014 ADS1015
ADS1013
ADS1014
ADS1015
www.ti.com
SBAS473C –MAY 2009–REVISED OCTOBER 2009
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (September 2009) to Revision C Page
• Deleted operating temperature bullet from Features section ............................................................................................... 1
• Deleted operating temperature range parameter from Absolute Maximum Ratings table ................................................... 2
• Deleted Operating temperature parameter from Temperature section of Electrical Characteristics table ........................... 4
• Changed Figure 2 to reflect maximum operating temperature ............................................................................................. 6
• Changed Figure 3 to reflect maximum operating temperature ............................................................................................. 6
• Changed Figure 4 to reflect maximum operating temperature ............................................................................................. 6
• Changed Figure 5 to reflect maximum operating temperature ............................................................................................. 6
• Changed Figure 6 to reflect maximum operating temperature ............................................................................................. 6
Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 25
Product Folder Link(s): ADS1013 ADS1014 ADS1015
PACKAGE OPTION ADDENDUM
www.ti.com 23-Dec-2010
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
ADS1013IDGSR ACTIVE MSOP DGS 10 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Purchase Samples
ADS1013IDGST ACTIVE MSOP DGS 10 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Request Free Samples
ADS1013IRUGR ACTIVE X2QFN RUG 10 3000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
ADS1013IRUGT ACTIVE X2QFN RUG 10 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Request Free Samples
ADS1014IDGSR ACTIVE MSOP DGS 10 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Purchase Samples
ADS1014IDGST ACTIVE MSOP DGS 10 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Request Free Samples
ADS1014IRUGR ACTIVE X2QFN RUG 10 3000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
ADS1014IRUGT ACTIVE X2QFN RUG 10 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Request Free Samples
ADS1015IDGSR ACTIVE MSOP DGS 10 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Purchase Samples
ADS1015IDGST ACTIVE MSOP DGS 10 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Request Free Samples
ADS1015IRUGR ACTIVE X2QFN RUG 10 3000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
ADS1015IRUGT ACTIVE X2QFN RUG 10 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Request Free Samples
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
PACKAGE OPTION ADDENDUM
www.ti.com 23-Dec-2010
Addendum-Page 2
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF ADS1015 :
•Automotive: ADS1015-Q1
NOTE: Qualified Version Definitions:
•Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
ADS1013IDGSR MSOP DGS 10 2500 330.0 12.4 5.3 3.3 1.3 8.0 12.0 Q1
ADS1013IDGST MSOP DGS 10 250 180.0 12.4 5.3 3.3 1.3 8.0 12.0 Q1
ADS1013IRUGR X2QFN RUG 10 3000 179.0 8.4 1.75 2.25 0.65 4.0 8.0 Q1
ADS1013IRUGT X2QFN RUG 10 250 179.0 8.4 1.75 2.25 0.65 4.0 8.0 Q1
ADS1014IDGSR MSOP DGS 10 2500 330.0 12.4 5.3 3.3 1.3 8.0 12.0 Q1
ADS1014IDGST MSOP DGS 10 250 180.0 12.4 5.3 3.3 1.3 8.0 12.0 Q1
ADS1014IRUGR X2QFN RUG 10 3000 179.0 8.4 1.75 2.25 0.65 4.0 8.0 Q1
ADS1014IRUGT X2QFN RUG 10 250 179.0 8.4 1.75 2.25 0.65 4.0 8.0 Q1
ADS1015IDGSR MSOP DGS 10 2500 330.0 12.4 5.3 3.3 1.3 8.0 12.0 Q1
ADS1015IDGST MSOP DGS 10 250 180.0 12.4 5.3 3.3 1.3 8.0 12.0 Q1
ADS1015IRUGR X2QFN RUG 10 3000 179.0 8.4 1.75 2.25 0.65 4.0 8.0 Q1
ADS1015IRUGT X2QFN RUG 10 250 179.0 8.4 1.75 2.25 0.65 4.0 8.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 22-Dec-2010
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
ADS1013IDGSR MSOP DGS 10 2500 370.0 355.0 55.0
ADS1013IDGST MSOP DGS 10 250 195.0 200.0 45.0
ADS1013IRUGR X2QFN RUG 10 3000 203.0 203.0 35.0
ADS1013IRUGT X2QFN RUG 10 250 203.0 203.0 35.0
ADS1014IDGSR MSOP DGS 10 2500 370.0 355.0 55.0
ADS1014IDGST MSOP DGS 10 250 195.0 200.0 45.0
ADS1014IRUGR X2QFN RUG 10 3000 203.0 203.0 35.0
ADS1014IRUGT X2QFN RUG 10 250 203.0 203.0 35.0
ADS1015IDGSR MSOP DGS 10 2500 370.0 355.0 55.0
ADS1015IDGST MSOP DGS 10 250 195.0 200.0 45.0
ADS1015IRUGR X2QFN RUG 10 3000 203.0 203.0 35.0
ADS1015IRUGT X2QFN RUG 10 250 203.0 203.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 22-Dec-2010
Pack Materials-Page 2
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