TMP06AKS-REEL7 - Analog Devices

±0.5°C Accurate PWM

Temperature Sensor in 5-Lead SC-70

TMP05/TMP06

Rev. 0

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FEATURES

Modulated serial digital output, proportional to

temperature

±0.5°C accuracy at 25°C

±1.0°C accuracy from 25°C to 70°C

Two grades available

Operation from −40°C to +150°C

Operation from 3 V to 5.5 V

Power consumption 70 µW maximum at 3.3 V

CMOS/TTL-compatible output on TMP05

Flexible open-drain output on TMP06

Small, low cost 5-lead SC-70 and SOT-23 packages

APPLICATIONS

Isolated sensors

Environmental control systems

Computer thermal monitoring

Thermal protection

Industrial process control

Power-system monitors

GENERAL DESCRIPTION

The TMP05/TMP06 are monolithic temperature sensors that

generate a modulated serial digital output (PWM), which varies

in direct proportion to the temperature of the devices. The high

period (TH) of the PWM remains static over all temperatures,

while the low period (TL) varies. The B Grade version offers a

higher temperature accuracy of ±1°C from 0°C to 70°C with

excellent transducer linearity. The digital output of the TMP05/

TMP06 is CMOS/TTL compatible, and is easily interfaced to

the serial inputs of most popular microprocessors. The flexible

open-drain output of the TMP06 is capable of sinking 5 mA.

The TMP05/TMP06 are specified for operation at supply

voltages from 3 V to 5.5 V. Operating at 3.3 V, the supply current

is typically 370 µA. The TMP05/TMP06 are rated for operation

over the –40°C to +150°C temperature range. It is not recom-

mended to operate these devices at temperatures above 125°C

for more than a total of 5% (5,000 hours) of the lifetime of the

devices. They are packaged in low cost, low area SC-70 and

SOT-23 packages.

FUNCTIONAL BLOCK DIAGRAM

TMP05/TMP06

OUT

CONV/IN FUNC

GND

TEMPERATURE

SENSOR

REFERENCE

CLK AND

TIMING

GENERATION

OUTPUT

CONTROL

AVERAGING

BLOCK /

COUNTER

03340-0-001

Σ-∆

CORE

Figure 1.

The TMP05/TMP06 have three modes of operation: continu-

ously converting mode, daisy-chain mode, and one shot mode.

A three-state FUNC input determines the mode in which the

TMP05/TMP06 operate.

The CONV/IN input pin is used to determine the rate with

which the TMP05/TMP06 measure temperature in continu-

ously converting mode and one shot mode. In daisy-chain

mode, the CONV/IN pin operates as the input to the daisy

chain.

PRODUCT HIGHLIGHTS

1. The TMP05/TMP06 have an on-chip temperature sensor

that allows an accurate measurement of the ambient

temperature. The measurable temperature range is –40°C

to +150°C.

2. Supply voltage is 3.0 V to 5.5 V.

3. Space-saving 5-lead SOT-23 and SC-70 packages.

4. Temperature accuracy is typically ±0.5°C. The part needs a

decoupling capacitor to achieve this accuracy.

5. 0.025°C temperature resolution.

6. The TMP05/TMP06 feature a one shot mode that reduces

the average power consumption to 102 µW at 1 SPS.

TMP05/TMP06

Rev. 0 | Page 2 of 28

TABLE OF CONTENTS

Specifications..................................................................................... 3

TMP05A/TMP06A Specifications ............................................. 3

TMP05B/TMP06B Specifications .............................................. 5

Timing Characteristics ................................................................ 7

Absolute Maximum Ratings............................................................ 8

ESD Caution.................................................................................. 8

Pin Configuration and Function Descriptions............................. 9

Typical Performance Characteristics ........................................... 10

Theory of Operation ...................................................................... 13

Circuit Information.................................................................... 13

Converter Details........................................................................ 13

Functional Description.............................................................. 13

Operating Modes........................................................................ 13

TMP05 Output ........................................................................... 16

TMP06 Output ........................................................................... 16

Application Hints ........................................................................... 17

Thermal Response Time ........................................................... 17

Self-Heating Effects.................................................................... 17

Supply Decoupling ..................................................................... 17

Temperature Monitoring........................................................... 18

Daisy-Chain Application........................................................... 18

Continuously Converting Application .................................... 23

Outline Dimensions....................................................................... 25

Ordering Guide .......................................................................... 25

REVISION HISTORY

8/04—Revision 0: Initial Version

TMP05/TMP06

Rev. 0 | Page 3 of 28

SPECIFICATIONS

TMP05A/TMP06A SPECIFICATIONS

All A Grade specifications apply for −40°C to +150°C; VDD decoupling capacitor is a 0.1 µF multilayer ceramic; TA = TMIN to TMAX, VDD =

3.0 V to 5.5 V, unless otherwise noted.

Table 1.

Parameter Min Typ Max Unit Test Conditions/Comments

TEMPERATURE SENSOR AND ADC

Nominal Conversion Rate (One Shot Mode) See Table 7

Accuracy @ VDD = 3.3 V (3.0 V − 3.6 V) ±2 °C TA = 0°C to 70°C, VDD = 3.0 V − 3.6 V

±3 °C TA = –40°C to +70°C, VDD = 3.0 V − 3.6 V

±4 °C TA = –40°C to +125°C, VDD = 3.0 V − 3.6 V

±51°C TA = –40°C to +150°C, VDD = 3.0 V − 3.6 V

Accuracy @ VDD = 5 V (4.5 V − 5.5 V) 1.5 °C TA = 0°C to 125°C, VDD = 4.5 V − 5.5 V

Temperature Resolution 0.025 °C/5 µs Step size for every 5 µs on TL

TH Pulse Width 40 ms TA = 25°C, nominal conversion rate

TL Pulse Width 76 ms TA = 25°C, nominal conversion rate

Quarter Period Conversion Rate

(All Operating Modes)

See Table 7

Accuracy @ VDD = 3.3 V (3.0 V − 3.6 V) 1.5 °C TA = –40°C to +150°C

Accuracy @ VDD = 5 V (4.5 V − 5.5 V) 1.5 °C TA = 0°C to 125°C

Temperature Resolution 0.1 °C/5 µs Step size for every 5 µs on TL

TH Pulse Width 10 ms TA = 25°C, QP conversion rate

TL Pulse Width 19 ms TA = 25°C, QP conversion rate

Double High/Quarter Low Conversion Rate

(All Operating Modes)

See Table 7

Accuracy @ VDD = 3.3 V (3.0 V − 3.6 V) 1.5 °C TA = –40°C to +150°C

Accuracy @ VDD = 5 V (4.5 V − 5.5 V) 1.5 °C TA = 0°C to 125°C

Temperature Resolution 0.1 °C/5 µs Step size for every 5 µs on TL

TH Pulse Width 80 ms TA = 25°C, DH/QL conversion rate

TL Pulse Width 19 ms TA = 25°C, DH/QL conversion rate

Long Term Drift 0.081 °C Drift over 10 years, if part is operated

at 55°C

SUPPLIES

Supply Voltage 3 5.5 V

Supply Current

Normal Mode2 @ 3.3 V 370 550 µA Nominal conversion rate

Normal Mode2 @ 5.0 V 425 650 µA Nominal conversion rate

Quiescent2 @ 3.3 V 3 6 µA Device not converting, output is high

Quiescent2 @ 5.0 V 5.5 10 µA Device not converting, output is high

One Shot Mode @ 1 SPS 30.9 µA Average current @ VDD = 3.3 V, nominal

conversion rate @ 25°C

37.38 µA

Average current @ VDD = 5.0 V, nominal

conversion rate @ 25°C

Power Dissipation 803.33 µW VDD = 3.3 V, continuously converting at

nominal conversion rates @ 25°C

1 SPS 101.9 µW Average power dissipated for VDD = 3.3 V,

one shot mode @ 25°C

186.9 µW

Average power dissipated for VDD = 5.0 V,

one shot mode @ 25°C

TMP05/TMP06

Rev. 0 | Page 4 of 28

Parameter Min Typ Max Unit Test Conditions/Comments

TMP05 OUTPUT (PUSH-PULL)3

Output High Voltage, VOH VDD − 0.3 V IOH = 800 µA

Output Low Voltage, VOL 0.4 V IOL = 800 µA

Output High Current, IOUT42 mA Typ VOH = 3.17 V with VDD = 3.3 V

Pin Capacitance 10 pF

Rise Time,5 tLH 50 ns

Fall Time,5 tHL 50 ns

RON Resistance (Low Output) 55 Ω Supply and temperature dependent

TMP06 OUTPUT (OPEN DRAIN)3

Output Low Voltage, VOL 0.4 V IOL = 1.6 mA

Output Low Voltage, VOL 1.2 V IOL = 5.0 mA

Pin Capacitance 10 pF

High Output Leakage Current, IOH 0.1 5 µA PWMOUT = 5.5 V

Device Turn-On Time 20 ms

Fall Time,6 tHL 30 ns

RON Resistance (Low Output) 55 Ω Supply and temperature dependent

DIGITAL INPUTS3

Input Current ±1 µA VIN = 0 V to VDD

Input Low Voltage, VIL 0.3 × VDD V

Input High Voltage, VIH 0.7 × VDD V

Pin Capacitance 3 10 pF

1 It is not recommended to operate the device at temperatures above 125°C for more than a total of 5% (5,000 hours) of the lifetime of the device. Any exposure beyond

this limit affects device reliability.

2 Normal mode current relates to current during TL. TMP05/TMP06 are not converting during TH, so quiescent current relates to current during TH.

3 Guaranteed by design and characterization, not production tested.

4 It is advisable to restrict the current being pulled from the TMP05 output, because any excess currents going through the die cause self-heating. As a consequence,

false temperature readings can occur.

5 Test load circuit is 100 pF to GND.

6 Test load circuit is 100 pF to GND, 10 kΩ to 5.5 V.

TMP05/TMP06

Rev. 0 | Page 5 of 28

TMP05B/TMP06B SPECIFICATIONS

All B Grade specifications apply for –40°C to +150°C; VDD decoupling capacitor is a 0.1 µF multilayer ceramic; TA = TMIN to TMAX, VDD =

3.0 V to 5.5 V, unless otherwise noted.

Table 2.

Parameter Min Typ Max Unit Test Conditions/Comments

TEMPERATURE SENSOR AND ADC

Nominal Conversion Rate (One Shot Mode) See Table 7

Accuracy1 @ VDD = 3.3 V (3.0 V – 3.6 V) ±0.5 ±1 °C TA = 25°C to 70°C, VDD = 3.0 V − 3.6 V

±1.25 °C TA = 0°C to 70°C, VDD = 3.0 V − 3.6 V

±1.5 °C TA = –40°C to +70°C, VDD = 3.0 V − 3.6 V

±2 °C TA = –40°C to +100°C, VDD = 3.0 V − 3.6 V

±2.5 °C TA = –40°C to +125°C, VDD = 3.0 V − 3.6 V

±32°C TA = –40°C to +150°C, VDD = 3.0 V − 3.6 V

Accuracy @ VDD = 5.0 V (4.5 V – 5.5 V) 1.5 °C TA = 0°C to 125°C, VDD = 4.5 V − 5.5 V

Temperature Resolution 0.025 °C/5 µs Step size for every 5 µs on TL

TH Pulse Width 40 ms TA = 25°C, nominal conversion rate

TL Pulse Width 76 ms TA = 25°C, nominal conversion rate

Quarter Period Conversion Rate

(All Operating Modes)

See Table 7

Accuracy @ VDD = 3.3 V (3.0 V – 3.6 V) ±1.5 °C TA = –40°C to +150°C

Accuracy @ VDD = 5.0 V (4.5 V – 5.5 V) ±1.5 °C TA = 0°C to 125°C

Temperature Resolution 0.1 °C/5 µs Step size for every 5 µs on TL

TH Pulse Width 10 ms TA = 25°C, QP conversion rate

TL Pulse Width 19 ms TA = 25°C, QP conversion rate

Double High/Quarter Low Conversion Rate

(All Operating Modes)

See Table 7

Accuracy @ VDD = 3.3 V (3.0 V – 3.6 V) ±1.5 °C TA = –40°C to +150°C

Accuracy @ VDD = 5 V (4.5 V – 5.5 V) ±1.5 °C TA = 0°C to 125°C

Temperature Resolution 0.1 °C/5 µs Step size for every 5 µs on TL

TH Pulse Width 80 ms TA = 25°C, DH/QL conversion rate

TL Pulse Width 19 ms TA = 25°C, DH/QL conversion rate

Long Term Drift 0.081 °C

Drift over 10 years, if part is operated at

55°C

SUPPLIES

Supply Voltage 3 5.5 V

Supply Current

Normal Mode3 @ 3.3 V 370 550 µA Nominal conversion rate

Normal Mode3 @ 5.0 V 425 650 µA Nominal conversion rate

Quiescent3 @ 3.3 V 3 6 µA Device not converting, output is high

Quiescent3 @ 5.0 V 5.5 10 µA Device not converting, output is high

One Shot Mode @ 1 SPS 30.9 µA Average current @ VDD = 3.3 V, nominal

conversion rate @ 25°C

37.38 µA

Average current @ VDD = 5.0 V, nominal

conversion rate @ 25°C

Power Dissipation 803.33 µW VDD = 3.3 V, continuously converting at

nominal conversion rates @ 25°C

1 SPS 101.9 µW Average power dissipated for VDD = 3.3 V,

one shot mode @ 25°C

186.9 µW

Average power dissipated for VDD = 5.0 V,

one shot mode @ 25°C

TMP05/TMP06

Rev. 0 | Page 6 of 28

Parameter Min Typ Max Unit Test Conditions/Comments

TMP05 OUTPUT (PUSH-PULL)4

Output High Voltage, VOH VDD − 0.3 V IOH = 800 µA

Output Low Voltage, VOL 0.4 V IOL = 800 µA

Output High Current, IOUT52 mA Typ VOH = 3.17 V with VDD = 3.3 V

Pin Capacitance 10 pF

Rise Time,6 tLH 50 ns

Fall Time,6 tHL 50 ns

RON Resistance (Low Output) 55 Ω Supply and temperature dependent

TMP06 OUTPUT (OPEN DRAIN)4

Output Low Voltage, VOL 0.4 V IOL = 1.6 mA

Output Low Voltage, VOL 1.2 V IOL = 5.0 mA

Pin Capacitance 10 pF

High Output Leakage Current, IOH 0.1 5 µA PWMOUT = 5.5 V

Device Turn-On Time 20 ms

Fall Time,7 tHL 30 ns

DIGITAL INPUTS4

Input Current ±1 µA VIN = 0 V to VDD

Input Low Voltage, VIL 0.3 × VDD V

Input High Voltage, VIH 0.7 × VDD V

Pin Capacitance 3 10 pF

1 The accuracy specifications for 3.0 V to 3.6 V supply range are specified to 3-sigma performance. See . Figure 22

2 It is not recommended to operate the device at temperatures above 125°C for more than a total of 5% (5,000 hours) of the lifetime of the device. Any exposure beyond

this limit affects device reliability.

3 Normal mode current relates to current during TL. TMP05/TMP06 are not converting during TH, so quiescent current relates to current during TH.

4 Guaranteed by design and characterization, not production tested.

5 It is advisable to restrict the current being pulled from the TMP05 output, because any excess currents going through the die cause self-heating. As a consequence,

false temperature readings can occur.

6 Test load circuit is 100 pF to GND.

7 Test load circuit is 100 pF to GND, 10 kΩ to 5.5 V.

TMP05/TMP06

Rev. 0 | Page 7 of 28

TIMING CHARACTERISTICS

TA = TMIN to TMAX, VDD = 3.0 V to 5.5 V, unless otherwise noted.

Guaranteed by design and characterization, not production tested.

Tab le 3.

Parameter Limit Unit Comments

TH 40 ms typ PWM high time @ 25°C under nominal conversion rate

TL 76 ms typ PWM low time @ 25°C under nominal conversion rate

t3150 ns typ TMP05 output rise time

t4150 ns typ TMP05 output fall time

t4230 ns typ TMP06 output fall time

t5 25 µs max Daisy-chain start pulse width

1 Test load circuit is 100 pF to GND.

2 Test load circuit is 100 pF to GND, 10 kΩ to 5.5 V.

03340-0-002

90% 10%

90%10%

Figure 2. PWM Output Nominal Timing Diagram (25°C)

START PULSE

03340-0-003

Figure 3. Daisy-Chain Start Timing

TMP05/TMP06

Rev. 0 | Page 8 of 28

ABSOLUTE MAXIMUM RATINGS

Table 4.

Parameter Rating

VDD to GND –0.3 V to +7 V

Digital Input Voltage to GND –0.3 V to VDD + 0.3 V

Maximum Output Current (OUT) ±10 mA

Operating Temperature Range1–40°C to +150°C

Storage Temperature Range –65°C to +160°C

Maximum Junction Temperature, TJMAX 150°C

5-Lead SOT-23

Power Dissipation2WMAX = (TJ max – TA3)/θJA

Thermal Impedance4

θJA, Junction-to-Ambient (Still Air) 240°C/W

5-Lead SC-70

Power Dissipation2 W

MAX = (TJ max – TA3)/θJA

Thermal Impedance4

θJA, Junction-to-Ambient 207.5°C/W

θJC, Junction-to-Case 172.3°C/W

IR Reflow Soldering

Peak Temperature 220°C (0°C/5°C)

Time at Peak Temperature 10 s to 20 s

Ramp-Up Rate 2°C/s to 3°C/s

Ramp-Down Rate –6°C/s

1 It is not recommended to operate the device at temperatures above 125°C

for more than a total of 5% (5,000 hours) of the lifetime of the device. Any

exposure beyond this limit affects device reliability.

2 SOT-23 values relate to the package being used on a 2-layer PCB and SC-70

values relate to the package being used on a 4-layer PCB. See Figure for a

plot of maximum power dissipation versus ambient temperature (T

A).

3 TA = ambient temperature.

4 Junction-to-case resistance is applicable to components featuring a

preferential flow direction, for example, components mounted on a heat

sink. Junction-to-ambient resistance is more useful for air-cooled PCB

mounted components.

Stresses above those listed under Absolute Maximum Ratings

may cause permanent damage to the device. This is a stress

rating only; functional operation of the device at these or any

other conditions above those indicated in the operational

section of this specification is not implied. Exposure to absolute

maximum rating conditions for extended periods may affect

device reliability.

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0–40 –20 0 20 40 60 80 100 120 140

03340-0-004

TEMPERATURE (°C)

MAXIMUM POWER DISSIPATION (W)

SC-70

SOT-23

Figure 4. Maximum Power Dissipation vs. Temperature

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on

the human body and test equipment and can discharge without detection. Although this product features

proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy

electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance

degradation or loss of functionality.

TMP05/TMP06

Rev. 0 | Page 9 of 28

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

TOP VIEW

(Not to Scale)

OUT

CONV/IN

FUNC

GND

03340-0-005

TMP05/

TMP06

Figure 5. Pin Configuration

Table 5. Pin Function Descriptions

Pin No. Mnemonic Description

1 OUT Digital Output. Pulse-width modulated (PWM) output gives a square wave whose ratio of high to low period is

proportional to temperature.

2 CONV/IN Digital Input. In continuously converting and one shot operating modes, a high, low, or float input determines the

temperature measurement rate. In daisy-chain operating mode, this pin is the input pin for the PWM signal from

the previous part on the daisy chain.

3 FUNC Digital Input. A high, low, or float input on this pin gives three different modes of operation. For details, see the

Operating Modes section.

4 GND Analog and Digital Ground.

5 VDD Positive Supply Voltage, 3.0 V to 5.5 V. Use of a decoupling capacitor of 0.1 µF as close as possible to this pin is

strongly recommended.

TMP05/TMP06

Rev. 0 | Page 10 of 28

TYPICAL PERFORMANCE CHARACTERISTICS

–50 –30 –10 10 30 50 70 90 110 130 150

03340-0-020

TEMPERATURE (°C)

OUTPUT FREQUENCY (Hz)

= 3.3V

OUT PIN LOADED WITH 10kΩ

Figure 6. PWM Output Frequency vs. Temperature

8.37

8.36

8.35

8.34

8.33

8.32

8.31

8.30

8.29

3.0 5.45.14.84.54.23.93.63.3

03340-0-021

SUPPLY VOLTAGE (V)

OUTPUT FREQUENCY (Hz)

OUT PIN LOADED WITH 10kΩ

AMBIENT TEMPERATURE = 25°C

Figure 7. PWM Output Frequency vs. Supply Voltage

140

120

100

–50 –30 –10 10 30 50 70 90 110 130 150

03340-0-022

TEMPERATURE (°C)

TIME (ms)

= 3.3V

OUT PIN LOADED WITH 10kΩ

TIME

Figure 8. TH and TL Times vs. Temperature

03340-0-023

100ns/DIV

1V/DIV

= 3.3V

LOAD

= 100pF

TIME (ns)

VOLTAGE (V)

Figure 9. TMP05 Output Rise Time at 25°C

03340-0-024

100ns/DIV

1V/DIV

= 3.3V

LOAD

= 100pF

TIME (ns)

VOLTAGE (V)

Figure 10. TMP05 Output Fall Time at 25°C

03340-0-025

100ns/DIV

1V/DIV

= 3.3V

PULLUP

= 1k

Ω

LOAD

= 10 k

Ω

LOAD

= 100pF

TIME (ns)

VOLTAGE (V)

Figure 11. TMP06 Output Fall Time at 25°C

TMP05/TMP06

Rev. 0 | Page 11 of 28

2000

1800

1600

1400

1200

1000

800

600

400

200

00 10000900080007000600050004000300020001000

03340-0-026

CAPACTIVE LOAD (pF)

TIME (ns)

= 3.3V

RISE TIME

FALL TIME

Figure 12. TMP05 Output Rise and Fall Times vs. Capacitive Load

250

200

150

100

–50 –25 0 25 50 75 100 125 150

03340-0-027

TEMPERATURE (°C)

OUTPUT LOW VOLTAGE (mV)

= 3.3V I

LOAD

= 5mA

LOAD

= 1mA

LOAD

= 0.5mA

Figure 13. TMP06 Output Low Voltage vs. Temperature

–50 –25 0 25 50 75 100 125 150

03340-0-028

TEMPERATURE (°C)

SINK CURRENT (mA)

= 3.3V

Figure 14. TMP06 Open Drain Sink Current vs. Temperature

1.25

–1.25

–1.00

–0.75

–0.50

–0.25

0.25

0.50

0.75

1.00

–40 –20 0 20 40 60 80 100 120 140

03340-0-029

TEMPERATURE (°C)

TEMPERATURE ERROR (°C)

= 3.3V

CONTINUOUS MODE OPERATION

NOMINAL CONVERSION RATE

Figure 15. Output Accuracy vs. Temperature

350

300

250

200

150

100

–50 –25 0 25 50 75 100 125 150

03340-0-030

TEMPERATURE (°C)

CURRENT (µA)

= 3.3V

CONTINUOUS MODE OPERATION

NOMINAL CONVERSION RATE

NO LOAD ON OUT PIN

Figure 16. Supply Current vs. Temperature

255

250

245

240

235

230

225

220

215

2.7 5.75.45.14.84.54.23.93.63.33.0

03340-0-031

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

AMBIENT TEMPERATURE = 25°C

CONTINUOUS MODE OPERATION

NOMINAL CONVERSION RATE

NO LOAD ON OUT PIN

Figure 17. Supply Current vs. Supply Voltage

TMP05/TMP06

Rev. 0 | Page 12 of 28

3.5

0.5

1.0

1.5

2.0

2.5

3.0

–40 –20 0 20 40 60 80 100 120 140

03340-0-032

TEMPERATURE OFFSET (°C)

= 5.5V

= 5V

TEMPERATURE (°C)

Figure 18. Temperature Offset vs. Power Supply Variation from 3.3 V

140

120

100

00 10203040506070

03340-0-033

TIME (Seconds)

TEMPERATURE (°C)

TEMPERATURE OF

ENVIRONMENT (30°C)

CHANGED HERE

FINAL TEMPERATURE = 120°C

Figure 19. Response to Thermal Shock

1.25

1.00

0.75

0.50

0.25

00 5 10 15 20 25 30

03340-0-034

LOAD CURRENT (mA)

TEMPERATURE ERROR (°C)

= 3.3V

AMBIENT TEMPERATURE = 25°C

Figure 20. TMP05 Temperature Error vs. Load Current

TMP05/TMP06

Rev. 0 | Page 13 of 28

THEORY OF OPERATION

CIRCUIT INFORMATION

The TMP05/TMP06 are monolithic temperature sensors that

generate a modulated serial digital output that varies in direct

proportion with the temperature of the device. An on-board

sensor generates a voltage precisely proportional to absolute

temperature, which is compared to an internal voltage reference

and is input to a precision digital modulator. The ratiometric

encoding format of the serial digital output is independent of

the clock drift errors common to most serial modulation

techniques such as voltage-to-frequency converters. Overall

accuracy for the A Grade is ±2°C from 0°C to +70°C, with

excellent transducer linearity. B Grade accuracy is ±1°C from

25°C to 70°C. The digital output of the TMP05 is CMOS/TTL

compatible, and is easily interfaced to the serial inputs of most

popular microprocessors. The open-drain output of the TMP06

is capable of sinking 5 mA.

The on-board temperature sensor has excellent accuracy and

linearity over the entire rated temperature range without

correction or calibration by the user.

The sensor output is digitized by a first-order Σ-∆ modulator,

also known as the charge balance type analog-to-digital

converter. This type of converter utilizes time-domain over-

sampling and a high accuracy comparator to deliver 12 bits of

effective accuracy in an extremely compact circuit.

CONVERTER DETAILS

The Σ-∆ modulator consists of an input sampler, a summing

network, an integrator, a comparator, and a 1-bit DAC. Similar

to the voltage-to-frequency converter, this architecture creates,

in effect, a negative feedback loop whose intent is to minimize

the integrator output by changing the duty cycle of the

comparator output in response to input voltage changes. The

comparator samples the output of the integrator at a much

higher rate than the input sampling frequency, which is called

oversampling. Oversampling spreads the quantization noise

over a much wider band than that of the input signal, improving

overall noise performance and increasing accuracy.

Σ-∆MODULATOR

INTEGRATOR COMPARATOR

1-BIT

DAC

DIGITAL

FILTER

CLOCK

GENERATOR

VOLTAGE REF

AND VPTAT

03340-0-006

TMP05/TMP06

OUT

(SINGLE-BIT)

Figure 21. First-Order Σ-∆ Modulator

The modulated output of the comparator is encoded using a

circuit technique that results in a serial digital signal with a

mark-space ratio format. This format is easily decoded by any

microprocessor into either °C or °F values, and is readily

transmitted or modulated over a single wire. More importantly,

this encoding method neatly avoids major error sources

common to other modulation techniques, because it is clock-

independent.

FUNCTIONAL DESCRIPTION

The output of the TMP05/TMP06 is a square wave with a

typical period of 116 ms at 25°C (CONV/IN pin is left floating).

The high period, TH, is constant, while the low period, TL, varies

with measured temperature. The output format for the nominal

conversion rate is readily decoded by the user as follows:

Temperature (°C) = 421 − (751 × (TH/TL)) (1)

03340-0-007

Figure 22. TMP05/TMP06 Output Format

The time periods TH (high period) and TL (low period) are

values easily read by a microprocessor timer/counter port, with

the above calculations performed in software. Because both

periods are obtained consecutively using the same clock,

performing the division indicated in the previous formula

results in a ratiometric value that is independent of the exact

frequency or drift of either the originating clock of the TMP05/

TMP06 or the user’s counting clock.

OPERATING MODES

The user can program the TMP05/TMP06 to operate in three

different modes by configuring the FUNC pin on power-up as

either low, floating, or high.

Table 6. Operating Modes

FUNC Pin Operating Mode

Low One shot

Floating Continuously converting

High Daisy-chain

Continuously Converting Mode

In continuously converting mode, the TMP05/TMP06 continu-

ously output a square wave representing temperature. The

frequency at which this square wave is output is determined by

the state of the CONV/IN pin on power-up. Any change to the

state of the CONV/IN pin after power-up is not reflected in the

parts until the TMP05/TMP06 are powered down and back up.

TMP05/TMP06

Rev. 0 | Page 14 of 28

One Shot Mode

In one shot mode, the TMP05/TMP06 output one square wave

representing temperature when requested by the microcon-

troller. The microcontroller pulls the OUT pin low and then

releases it to indicate to the TMP05/TMP06 that an output is

required. The temperature measurement is output when the

OUT line is released by the microcontroller (see Figure 23).

03340-0-019

CONTROLLER PULLS DOWN

OUT LINE HERE

CONTROLLER RELEASES

OUT LINE HERE

TEMP MEASUREMENT

TIMET0

Figure 23. TMP05/TMP06 One Shot OUT Pin Signal

In the TMP05 one shot mode only, an internal resistor is

switched in series with the pull-up MOSFET. The TMP05 OUT

pin has a push-pull output configuration (see Figure 24), and,

therefore, needs a series resistor to limit the current drawn on

this pin when the user pulls it low to start a temperature

conversion. This series resistance prevents any short circuit

from VDD to GND, and, therefore, protects the TMP05 from

short-circuit damage.

TMP05

V+

OUT

03340-0-016

5kΩ

Figure 24. TMP05 One Shot Mode OUT Pin Configuration

The advantages of the one shot mode include lower average

power consumption, and the microcontroller knows that the

first low-to-high transition occurs after the microcontroller

releases the OUT pin.

Conversion Rate

In continuously converting and one shot modes, the state of the

CONV/IN pin on power-up determines the rate at which the

TMP05/TMP06 measure temperature. The available conversion

rates are shown in Table 7.

Table 7. Conversion Rates

CONV/IN Pin Conversion Rate TH/TL (25°C)

Low Quarter period

(TH ÷ 4, TL ÷ 4)

10/19 (ms)

Floating Nominal 40/76 (ms)

High Double high (TH x 2)

Quarter low (TL ÷ 4)

80/19 (ms)

The TMP05 (push-pull output) advantage when using the high

state conversion rate (double high/quarter low) is lower power

consumption. However, the trade-off is loss of resolution on the

low time. Depending on the state of the CONV/IN pin, two

different temperature equations must be used.

The temperature equation for the low and floating states’

conversion rates is

Temperature (°C) = 421 − (751 × (TH/TL)) (2)

Table 8. Conversion Times Using Equation 2

Temperature (°C) TL (ms) Nominal Cycle Time (ms)

–40 65.2 105

–30 66.6 107

–20 68.1 108

–10 69.7 110

0 71.4 111

10 73.1 113

20 74.9 115

25 75.9 116

30 76.8 117

40 78.8 119

50 81 121

60 83.2 123

70 85.6 126

80 88.1 128

90 90.8 131

100 93.6 134

110 96.6 137

120 99.8 140

130 103.2 143

140 106.9 147

150 110.8 151

TMP05/TMP06

Rev. 0 | Page 15 of 28

03340-0-009

OUT

MICRO

TMP05/

TMP06

CONV/IN

OUT

TMP05/

TMP06

CONV/IN

OUT

TMP05/

TMP06

CONV/IN

OUT

TMP05/

TMP06

CONV/IN

OUT

The temperature equation for the high state conversion rate is

Temperature (°C) = 421 − (93.875 × (TH/TL)) (3)

Table 9. Conversion Times Using Equation 3

Temperature (°C) TL (ms) High Cycle Time (ms)

–40 16.3 96.2

–30 16.7 96.6

–20 17 97.03

–10 17.4 97.42

0 17.8 97.84

10 18.3 98.27

20 18.7 98.73

25 19 98.96

30 19.2 99.21

40 19.7 99.71

50 20.2 100.24

60 20.8 100.8

70 21.4 101.4

80 22 102.02

90 22.7 102.69

100 23.4 103.4

110 24.1 104.15

120 25 104.95

130 25.8 105.81

140 26.7 106.73

150 27.7 107.71

Figure 25. Daisy-Chain Structure

A second microcontroller line is needed to generate the conver-

sion start pulse on the CONV/IN pin. The pulse width of the

start pulse should be less than 25 µs. The start pulse on the

CONV/IN pin lets the first TMP05/TMP06 part know that it

should start a conversion and output its own temperature now.

Once the part has output its own temperature, it then outputs a

start pulse for the next part on the daisy-chain link. The pulse

width of the start pulse from each TMP05/TMP06 part is

typically 17 µs.

Figure 26 shows the start pulse on the CONV/IN pin of the first

device on the daisy chain and Figure 27 shows the PWM output

by this first part.

03340-0-017

START

PULSE

<25µs

TIME

CONVERSION

STARTS ON

THIS EDGE

MUST GO HIGH ONLY

AFTER START PULSE HAS

BEEN OUTPUT BY LAST

TMP05/TMP06 ON DAISY CHAIN.

Daisy-Chain Mode

Setting the FUNC pin to a high state allows multiple TMP05/

TMP06s to be connected together and, therefore, allows one

input line of the microcontroller to be the sole receiver of all

temperature measurements. In this mode, the CONV/IN pin

operates as the input of the daisy chain, and conversions take

place at the nominal conversion rate of TH/TL = 40 ms/ 76 ms

at 25°C.

Therefore, the temperature equation for the daisy-chain mode

of operation is

Figure 26. Start Pulse at CONV/IN Pin of First TMP05/TMP06 Device

on Daisy Chain

Temperature (°C) = 421 − (751 × (TH/TL)) (4)

03340-0-010

START

PULSE

17µs

#1 TEMP MEASUREMENT

TIME

Figure 27. Daisy-Chain Temperature Measurement

and Start Pulse Output from First TMP05/TMP06

TMP05/TMP06

Rev. 0 | Page 16 of 28

03340-0-008

START

PULSE

#1 TEMP MEASUREMENT #2 TEMP MEASUREMENT #N TEMP MEASUREMENT

T0TIME

Figure 28. Daisy-Chain Signal at Input to the Microcontroller

Before the start pulse reaches a TMP05/TMP06 part in the

daisy chain, the device acts as a buffer for the previous tempera-

ture measurement signals. Each part monitors the PWM signal

for the start pulse from the previous part. Once the part detects

the start pulse, it initiates a conversion and inserts the result at

the end of the daisy-chain PWM signal. It then inserts a start

pulse for the next part in the link. The final signal input to the

microcontroller should look like Figure 28. The input signal on

Pin 2 (IN) of the first daisy-chain device must remain low until

the last device has output its start pulse.

If the input on Pin 2 (IN) goes high and remains high, the

TMP05/TMP06 part powers down between 0.3 s and 1.2 s later.

The part, therefore, requires another start pulse to generate

another temperature measurement. Note that, to reduce power

dissipation through the part, it is recommended to keep Pin 2

(IN) at a high state when the part is not converting. If the IN

pin is at 0 V, then the OUT pin is at 0 V (because it is acting as a

buffer when not converting), and drawing current through

either the pull-up MOSFET (TMP05) or the pull-up resistor

(TMP06).

TMP05 OUTPUT

The TMP05 has a push-pull CMOS output (Figure 29) and

provides rail-to-rail output drive for logic interfaces. The rise

and fall times of the TMP05 output are closely matched, so that

errors caused by capacitive loading are minimized. If load

capacitance is large (for example, when driving a long cable), an

external buffer might improve accuracy.

An internal resistor is connected in series with the pull-up

MOSFET when the TMP05 is operating in one shot mode.

TMP05

V+

OUT

03340-0-011

Figure 29. TMP05 Digital Output Structure

TMP06 OUTPUT

The TMP06 has an open-drain output. Because the output

source current is set by the pull-up resistor, output capacitance

should be minimized in TMP06 applications. Otherwise,

unequal rise and fall times skew the pulse width and introduce

measurement errors.

OUT

TMP06

03340-0-012

Figure 30. TMP06 Digital Output Structure

TMP05/TMP06

Rev. 0 | Page 17 of 28

APPLICATION HINTS

THERMAL RESPONSE TIME

The time required for a temperature sensor to settle to a

specified accuracy is a function of the thermal mass of the

sensor and the thermal conductivity between the sensor and the

object being sensed. Thermal mass is often considered

equivalent to capacitance. Thermal conductivity is commonly

specified using the symbol Q, and can be thought of as thermal

resistance. It is commonly specified in units of degrees per watt

of power transferred across the thermal joint. Thus, the time

required for the TMP05/TMP06 to settle to the desired

accuracy is dependent on the package selected, the thermal

contact established in that particular application, and the

equivalent power of the heat source. In most applications, the

settling time is probably best determined empirically.

SELF-HEATING EFFECTS

The temperature measurement accuracy of the TMP05/TMP06

might be degraded in some applications due to self-heating.

Errors introduced are from the quiescent dissipation and power

dissipated when converting, that is, during TL. The magnitude of

these temperature errors is dependent on the thermal conduc-

tivity of the TMP05/TMP06 package, the mounting technique,

and the effects of airflow. Static dissipation in the TMP05/

TMP06 is typically 10 W operating at 3.3 V with no load. In the

5-lead SC-70 package mounted in free air, this accounts for a

temperature increase due to self-heating of

ΔT = PDISS × θJA = 10 µW × 211.4°C/W = 0.0021°C (5)

In addition, power is dissipated by the digital output, which is

capable of sinking 800 µA continuously (TMP05). Under an

800 µA load, the output can dissipate

PDISS = (0.4 V)(0.8 mA)((TL)/TH + TL)) (6)

For example, with TL = 80 ms and TH = 40 ms, the power

dissipation due to the digital output is approximately 0.21 mW.

In a free-standing SC-70 package, this accounts for a tempera-

ture increase due to self-heating of

ΔT = PDISS × θJA = 0.21 mW × 211.4°C/W = 0.044°C (7)

This temperature increase adds directly to that from the

quiescent dissipation and affects the accuracy of the TMP05/

TMP06 relative to the true ambient temperature.

It is recommended that current dissipated through the device be

kept to a minimum, because it has a proportional effect on the

temperature error.

SUPPLY DECOUPLING

The TMP05/TMP06 should be decoupled with a 0.1 µF ceramic

capacitor between VDD and GND. This is particularly important,

if the TMP05/TMP06 are mounted remotely from the power

supply. Precision analog products such as the TMP05/TMP06

require a well-filtered power source. Because the TMP05/

TMP06 operate from a single supply, it might seem convenient

to simply tap into the digital logic power supply. Unfortunately,

the logic supply is often a switch-mode design, which generates

noise in the 20 kHz to 1 MHz range. In addition, fast logic gates

can generate glitches hundreds of mV in amplitude due to

wiring resistance and inductance.

If possible, the TMP05/TMP06 should be powered directly

from the system power supply. This arrangement, shown in

Figure 31, isolates the analog section from the logic switching

transients. Even if a separate power supply trace is not available,

however, generous supply bypassing reduces supply-line-

induced errors. Local supply bypassing consisting of a 0.1 µF

ceramic capacitor is critical for the temperature accuracy

specifications to be achieved. This decoupling capacitor must

be placed as close as possible to the TMP05/TMP06’s VDD pin.

A recommended decoupling capacitor is Phicomp’s 100 nF,

50 V X74.

Keep the capacitor package size as small as possible, because

ESL (equivalent series inductance) increases with increasing

package size. Reducing the capacitive value below 100 nF

increases the ESR (equivalent series resistance). Use of a

capacitor with an ESL of 1 nH and an ESR of 80 mΩ is

recommended.

03340-0-013

0.1µF

TMP05/

TMP06

TTL/CMOS

LOGIC

CIRCUITS

POWER

SUPPLY

Figure 31. Use Separate Traces to Reduce Power Supply Noise

TMP05/TMP06

Rev. 0 | Page 18 of 28

TEMPERATURE MONITORING

The TMP05/TMP06 are ideal for monitoring the thermal

environment within electronic equipment. For example, the

surface-mounted package accurately reflects the exact thermal

conditions that affect nearby integrated circuits.

The TMP05/TMP06 measure and convert the temperature at

the surface of their own semiconductor chip. When the TMP05/

TMP06 are used to measure the temperature of a nearby heat

source, the thermal impedance between the heat source and the

TMP05/TMP06 must be considered. Often, a thermocouple or

other temperature sensor is used to measure the temperature of

the source, while the TMP05/TMP06 temperature is monitored

by measuring TH and TL. Once the thermal impedance is deter-

mined, the temperature of the heat source can be inferred from

the TMP05/TMP06 output.

One example of using the TMP05/TMP06’s unique properties is

in monitoring a high power dissipation microprocessor. The

TMP05/TMP06 part, in a surface-mounted package, is mounted

directly beneath the microprocessor’s pin grid array (PGA)

package. In a typical application, the TMP05/TMP06’s output is

connected to an ASIC, where the pulse width is measured. The

TMP05/TMP06 pulse output provides a significant advantage in

this application, because it produces a linear temperature output

while needing only one I/O pin and without requiring an ADC.

DAISY-CHAIN APPLICATION

This section provides an example of how to connect two

TMP05s in daisy-chain mode to a standard 8052 microcon-

troller core. The ADuC812 is the microcontroller used in the

following example and has the 8052 as its core processing

engine. Figure 32 shows how to interface to the 8052 core

device. TMP05 Program Code Example 1 shows how to

communicate from the ADuC812 to the two daisy-chained

TMP05s. This code can also be used with the ADuC831 or any

microprocessor running on an 8052 core.

Figure 32 is a diagram of the input waveform into the ADuC812

from the TMP05 daisy chain, and it shows how the code’s

variables are assigned. It should be referenced when reading

TMP05 Program Code Example 1. Application notes are

available on the Analog Devices Web site showing the TMP05

working with other types of microcontrollers.

03340-0-035

IMER T0

TARTS TEMPSEGMENT = 1 TEMPSEGMENT = 2 TEMPSEGMENT = 3

TEMP_HIGH2TEMP_HIGH1

TEMP_LOW0 TEMP_LOW1

TEMP_HIGH0

INTO INTO INTO

Figure 32. Reference Diagram for Software Variables

in TMP05 Program Code Example 1

Figure 33 shows how the three devices are hardwired together.

Figure 34 to Figure 36 are flow charts for this program.

START

PULSE

(U2)

(U1)

TIME

(U1)

GND FUNC

CONV/IN

OUT

TMP05 (U1)

GND FUNC

CONV/IN

OUT

TMP05 (U2)

ADuC812

P3.7

P3.2/INTO

TIME

START

PULSE

START

PULSE

03340-0-014

Figure 33. Typical Daisy-Chain Application Circuit

TMP05/TMP06

Rev. 0 | Page 19 of 28

03340-0-036

DECLARE VARIABLES

INITIALIZE TIMERS

ENABLE TIMER

INTERRUPTS

SEND START

PULSE

START TIMER 0

SET-UP EDGE

TRIGGERED

(H-L) INTO

ENABLE INTO

INTERRUPT

ENABLE GLOBAL

INTERRUPTS

WAIT FOR

INTERRUPT

PROCESS

INTERRUPTS

WAIT FOR END

OF MEASUREMENT

CALCULATE

TEMPERATURE

AND SEND

FROM UART

Figure 34. ADuC812 Main Routine Flowchart

03340-0-038

SET-UP UART

CONVERT VARIABLES

TO FLOATS

CALCULATE

TEMPERATURE

FROM U1

TEMP U1 =

421 – (751

(TEMP_HIGH0/

(TEMP_LOW0 – (TEMP_HIGH1)))

CALCULATE

TEMPERATURE

FROM U2

TEMP U2 =

421 – (751

(TEMP_HIGH1/

(TEMP_LOW1 – (TEMP_HIGH2)))

SEND TEMPERATURE

RESULTS

OUT OF UART

Figure 35. ADuC812 Temperature Calculation Routine Flowchart

TMP05/TMP06

Rev. 0 | Page 20 of 28

03340-0-037

YE S

YES

ENTER INTERRUPT

ROUTINE

CHECK IF TIMER 1

IS RUNNING

COPY TIMER 1 VALUES

INTO A REGISTER

RESET TIMER 1

START TIMER 1

IS TEMPSEGMENT

= 1

CALCULATE

TEMP_HIGH0

RESET TIMER 0

TO ZERO

IS TEMPSEGMENT

= 2

IS TEMPSEGMENT

= 3

CALCULATE

TEMP_LOW1

CALCULATE

TEMP_HIGH2

USING TIMER 0

VALUES

INCREMENT

TEMPSEGMENT

EXIT INTERRUPT

ROUTINE

CALCULATE

TEMP_LOW0

USING TIMER 1

VALUES

CALCULATE

TEMP_HIGH1

USING TIMER 0

VALUES

RESET TIMER 0

TO ZERO

YES

Figure 36. ADuC812 Interrupt Routine Flowchart

TMP05 Program Code Example 1

//=============================================================================================

// Description : This program reads the temperature from 2 daisy-chained TMP05 parts.

// This code runs on any standard 8052 part running at 11.0592MHz.

// If an alternative core frequency is used, the only change required is an

// adjustment of the baud rate timings.

// P3.2 = Daisy-chain output connected to INT0.

// P3.7 = Conversion control.

// Timer0 is used in gate mode to measure the high time.

// Timer1 is triggered on a high-to-low transition of INT0 and is used to measure

// the low time.

//=============================================================================================

TMP05/TMP06

Rev. 0 | Page 21 of 28

#include <stdio.h>

#include <ADuC812.h> //ADuC812 SFR definitions

void delay(int);

sbit Daisy_Start_Pulse = 0xB7; //Daisy_Start_Pulse = P3.7

sbit P3_4 = 0xB4;

long temp_high0,temp_low0,temp_high1,temp_low1,temp_high2,th,tl; //Global variables to allow

//access during ISR.

//See Figure 32.

int timer0_count=0,timer1_count=0,tempsegment=0;

void int0 () interrupt 0 //INT0 Interrupt Service Routine

{

if (TR1 == 1)

{

th = TH1;

tl = TL1;

th = TH1; //To avoid misreading timer

TL1 = 0;

TH1 = 0;

}

TR1=1; //Start timer1 running, if not running

Already

if (tempsegment == 1)

{

temp_high0 = (TH0*0x100+TL0)+(timer0_count*65536); //Convert to integer

TH0=0x00; //Reset count

TL0=0x00;

timer0_count=0;

}

if (tempsegment == 2)

{

temp_low0 = (th*0x100+tl)+(timer1_count*65536); //Convert to integer

temp_high1 = (TH0*0x100+TL0)+(timer0_count*65536); //Convert to integer

TH0=0x00; //Reset count

TL0=0x00;

timer0_count=0;

timer1_count=0;

}

if (tempsegment == 3)

{

temp_low1 = (th*0x100+tl)+(timer1_count*65536); //Convert to integer

temp_high2 = (TH0*0x100+TL0)+(timer0_count*65536);

TH0=0x00; //Reset count

TL0=0x00;

timer0_count=0;

timer1_count=0;

}

tempsegment++;

}

void timer0 () interrupt 1

{

timer0_count++; //Keep a record of timer0 overflows

}

void timer1 () interrupt 3

{

timer1_count++; //Keep a record of timer1 overflows

TMP05/TMP06

Rev. 0 | Page 22 of 28

}

void main(void)

{

double temp1=0,temp2=0;

double T1,T2,T3,T4,T5;

// Initialization

TMOD = 0x19; // Timer1 in 16-bit counter mode

// Timer0 in 16-bit counter mode

// with gate on INT0. Timer0 only counts when INTO pin // is high.

ET0 = 1; // Enable timer0 interrupts

ET1 = 1; // Enable timer1 interrupts

tempsegment = 1; // Initialize segment

Daisy_Start_Pulse = 0; // Pull P3.7 low

// Start Pulse

Daisy_Start_Pulse = 1;

Daisy_Start_Pulse = 0; //Toggle P3.7 to give start pulse

// Set T0 to count the high period

TR0 = 1; // Start timer0 running

IT0 = 1; // Interrupt0 edge triggered

EX0 = 1; // Enable interrupt

EA = 1; // Enable global interrupts

for(;;)

{

if (tempsegment == 4)

break;

}

//CONFIGURE UART

SCON = 0x52 ; // 8-bit, no parity, 1 stop bit

TMOD = 0x20 ; // Configure timer1..

TH1 = 0xFD ; // ..for 9600baud..

TR1 = 1; // ..(assuming 11.0592MHz crystal)

//Convert variables to floats for calculation

T1= temp_high0;

T2= temp_low0;

T3= temp_high1;

T4= temp_low1;

T5= temp_high2;

temp1=421-(751*(T1/(T2-T3)));

temp2=421-(751*(T3/(T4-T5)));

printf("Temp1 = %f\nTemp2 = %f\n",temp1,temp2); //Sends temperature result out UART

while (1); // END of program

}

// Delay routine

void delay(int length)

{

while (length >=0)

length--;

}

TMP05/TMP06

Rev. 0 | Page 23 of 28

03340-0-039

3.3V

GNDFUNC

CONV/IN

OUT

TMP05

PIC16F876

0.1µF

PA.0

FIRST TEMP

MEASUREMENT

TIME

SECOND TEMP

MEASUREMENT

CONTINUOUSLY CONVERTING APPLICATION

This section provides an example of how to connect one

TMP05 in continuously converting mode to a microchip

PIC16F876 microcontroller. Figure 37 shows how to interface to

the PIC16F876.

TMP05 Program Code Example 2 shows how to communicate

from the microchip device to the TMP05. This code can also be

used with other PICs by simply changing the include file for the

part.

Figure 37. Typical Daisy-Chain Application Circuit

TMP05 Program Code Example 2

//=============================================================================================

// Description : This program reads the temperature from a TMP05 part set up in continuously

// converting mode.

// This code was written for a PIC16F876, but can be easily configured to function with other

// PICs by simply changing the include file for the part.

// Fosc = 4MHz

// Compiled under CCS C compiler IDE version 3.4

// PWM output from TMP05 connected to PortA.0 of PIC16F876

//============================================================================================

#include <16F876.h> // Insert header file for the particular PIC being used

#device adc=8

#use delay(clock=4000000)

#fuses NOWDT,XT, PUT, NOPROTECT, BROWNOUT, LVP

//_______________________________Wait for high function_____________________________________

void wait_for_high() {

while(input(PIN_A0)) ; /* while high, wait for low */

while(!input(PIN_A0)); /* wait for high */

}

//______________________________Wait for low function_______________________________________

void wait_for_low() {

while(input(PIN_A0)); /* wait for high */

}

//_______________________________Main begins here____________________________________________

void main(){

long int high_time,low_time,temp;

setup_adc_ports(NO_ANALOGS);

setup_adc(ADC_OFF);

setup_spi(FALSE);

setup_timer_1 ( T1_INTERNAL | T1_DIV_BY_2); //Sets up timer to overflow after 131.07ms

TMP05/TMP06

Rev. 0 | Page 24 of 28

do{

wait_for_high();

set_timer1(0); //Reset timer

wait_for_low();

high_time = get_timer1();

set_timer1(0); //Reset timer

wait_for_high();

low_time = get_timer1();

temp = 421 – ((751 * high_time)/low_time)); //Temperature equation for the high state

//conversion rate.

//Temperature value stored in temp as a long int

}while (TRUE);

}

TMP05/TMP06

Rev. 0 | Page 25 of 28

OUTLINE DIMENSIONS

COMPLIANT TO JEDEC STANDARDS MO-203AA

2.00 BSC

0.30

0.15

0.10MAX

1.00

0.90

0.70

SEATING

PLANE

1.10 MAX

0.22

0.08 0.46

0.36

0.26

PIN 1

2.10 BSC

0.65 BSC

1.25 BSC

0.10 COPLANARIT

8°

4°

0°

Figure 38. 5-Lead Thin Shrink Small Outline Transistor Package [SC-70]

(KS-5)

Dimensions shown in millimeters

PIN 1

1.60 BSC 2.80 BSC

1.90

BSC

0.95 BSC

4 5

0.22

0.08 10°

5°

0°

0.50

0.30

0.15 MAX SEATING

PLANE

1.45 MAX

1.30

1.15

0.90

2.90 BSC

0.60

0.45

0.30

COMPLIANT TO JEDEC STANDARDS MO-178AA

Figure 39. 5-Lead Small Outline Transistor Package [SOT-23]

(RJ-5)

Dimensions shown in millimeters

ORDERING GUIDE

Model

Minimum

Quantities/Reel

Temperature

Range1

Temperature

Accuracy2

Package

Description

Package

Option Branding

TMP05AKS-500RL7 500 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T8A

TMP05AKS-REEL 10000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T8A

TMP05AKS-REEL7 3000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T8A

TMP05ART-500RL7 500 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T8A

TMP05ART-REEL 10000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T8A

TMP05ART-REEL7 3000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T8A

TMP05BKS-500RL7 500 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T8B

TMP05BKS-REEL 10000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T8B

TMP05BKS-REEL7 3000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T8B

TMP05BRT-500RL7 500 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T8B

TMP05BRT-REEL 10000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T8B

TMP05BRT-REEL7 3000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T8B

TMP05AKSZ-500RL74 500 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T8C

TMP05AKSZ-REEL4 10000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T8C

TMP05AKSZ-REEL74 3000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T8C

TMP05ARTZ-500RL74 500 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T8C

TMP05ARTZ-REEL4 10000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T8C

TMP05ARTZ-REEL74 3000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T8C

TMP05BKSZ-500RL74 500 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T8D

TMP05BKSZ-REEL4 10000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T8D

TMP05BKSZ-REEL74 3000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T8D

TMP05BRTZ-500RL74 500 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T8D

TMP05BRTZ-REEL4 10000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T8D

TMP05BRTZ-REEL74 3000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T8D

TMP05/TMP06

Rev. 0 | Page 26 of 28

Model

Minimum

Quantities/Reel

Temperature

Range1

Temperature

Accuracy2

Package

Description

Package

Option Branding

TMP06AKS-500RL7 500 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T9A

TMP06AKS-REEL 10000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T9A

TMP06AKS-REEL7 3000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T9A

TMP06ART-500RL7 500 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T9A

TMP06ART-REEL 10000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T9A

TMP06ART-REEL7 3000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T9A

TMP06BKS-500RL7 500 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T9B

TMP06BKS-REEL 10000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T9B

TMP06BKS-REEL7 3000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T9B

TMP06BRT-500RL7 500 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T9B

TMP06BRT-REEL 10000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T9B

TMP06BRT-REEL7 3000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T9B

TMP06AKSZ-500RL74 500 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T9C

TMP06AKSZ-REEL4 10000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T9C

TMP06AKSZ-REEL74 3000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T9C

TMP06ARTZ-500RL74 500 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T9C

TMP06ARTZ-REEL4 10000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T9C

TMP06ARTZ-REEL74 3000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T9C

TMP06BKSZ-500RL74 500 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T9D

TMP06BKSZ-REEL4 10000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T9D

TMP06BKSZ-REEL74 3000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T9D

TMP06BRTZ-500RL74 500 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T9D

TMP06BRTZ-REEL4 10000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T9D

TMP06BRTZ-REEL74 3000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T9D

1 It is not recommended to operate the device at temperatures above 125°C for more than a total of 5% (5,000 hours) of the lifetime of the device. Any exposure beyond

this limit affects device reliability.

2 A-Grade temperature accuracy is over the 0°C to 70°C temperature range and B-Grade temperature accuracy is over the +25°C to 70°C temperature range.

3 Consult sales for availability.

4 Z = Pb-free part.

TMP05/TMP06

Rev. 0 | Page 27 of 28

NOTES

TMP05/TMP06

Rev. 0 | Page 28 of 28

NOTES

registered trademarks are the property of their respective owners.

D03340–0–8/04(0)