ams Datasheet Page 1
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TSL2580, TSL2581
Light-to-Digital Converter
The TSL2580 and TSL2581 are very-high sensitivity
light-to-digital converters that transform light intensity to a
digital signal output capable of direct I²C (TSL2581) or SMBus
(TSL2580) interface. Each device combines one broadband
photodiode (visible plus infrared) and one infrared-responding
photodiode on a single CMOS integrated circuit capable of
providing a near-photopic response over an effective 16-bit
dynamic range (16-bit resolution). Two integrating ADCs
convert the photodiode currents to a digital output that
represents the irradiance measured on each channel. This
digital output can be input to a microprocessor where
illuminance (ambient light level) in lux is derived using an
empirical formula to approximate the human eye response. The
TSL2580 device permits an SMB-Alert style interrupt, and the
TSL2581 device supports a traditional level style interrupt that
remains asserted until the firmware clears it.
While useful for general purpose light sensing applications, the
TSL2580/81 devices are designed particularly for display panels
(LCD, OLED, etc.) with the purpose of extending battery life and
providing optimum viewing in diverse lighting conditions.
Display panel backlighting, which can account for up to 30 to
40 percent of total platform power, can be automatically
managed. Both devices are also ideal for controlling keyboard
illumination based upon ambient lighting conditions.
Illuminance information can further be used to manage
exposure control in digital cameras. The TSL2580/81 devices are
ideal in notebook/tablet PCs, LCD monitors, flat-panel
televisions, cell phones, and digital cameras. In addition, other
applications include street light control, security lighting,
sunlight harvesting, machine vision, and automotive
instrumentation clusters.
Ordering Information and Content Guide appear at end of
datasheet.
General Description
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TSL2580, TSL2581 − General Description
Key Benefits & Features
The benefits and features of TSL2580, TSL2581, Light-to-Digital
Converter are listed below:
Figure 1:
Added Value Of Using TSL2580, TSL2581
•Approximately 30x More Sensitive Than the TSL2560/61
Device
•Approximates Human Eye Response
•Programmable ALS Interrupt Function with User-Defined
Upper and Lower Threshold Settings
•16-Bit Digital Output with SMBus (TSL2580) at 100 kHz or
I²C (TSL2581) Fast-Mode at 400 kHz
•Programmable Analog Gain and Integration Time
Supporting 1,000,000-to-1 Dynamic Range
•Automatically Rejects 50/60-Hz Lighting Ripple
Applications
TSL2580, TSL2581, Light-to-Digital Converter is ideal for:
•Ambient Light Sensor (ALS) for Smart Phones, Digital
Photo Frames, and Portable Navigation Systems
•ALS for LED Signs, Laptop Computers, and LCD TVs
Benefits Features
•Enables Operation in IR Light Environments •Patented Dual-Diode Architecture
•Enables Dark Room to High Lux Sunlight
Operation •1M:1 Dynamic Range
•Digital Interface is Less Susceptible to Noise •SMBus Digital Interface
•Enables Low Standby Power Consumption •3µA Quiescent Current
•Reduces Board Space Requirements while
Simplifying Designs
•Available in 1.25mm x 1.75mm Chipscale or 2mm x 2mm
Dual Flat No-Lead (FN) Packages
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TSL2580, TSL2581 − General Description
Block Diagram
The functional blocks of this device are shown below:
Figure 2:
TSL2580, TSL2581 Block Diagram
Two-Wire Serial Interface
Address Select Interrupt
SDA
VDD = 2.7 V to 3.6 V
Channel 0
Visible and IR
Channel 1
IR Only
Command
Register
ADC
Register INT
SCL
ADDR SEL
Integrating
A/D Converter
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TSL2580, TSL2581 − Pin Assig nments
The TSL2580, TSL2581 pin assignments are described below:
Figure 3:
Package CS 6-Lead Chipscale
Figure 4:
Package FN Dual Flat No-Lead
Figure 5:
Terminal Functions
Package CS 6-Lead Chipscale
(Top View):
Package Drawings are Not to Scale
Package FN Dual Flat No-Lead
(Top View):
Package Drawings are Not to Scale
Terminal Type Description
Name CS Pkg No FN Pkg No
VDD 1 1 Supply voltage
ADDR SEL 2 2 I Address select — three-state
GND 3 3 Power supply ground. All voltages are referenced to
GND
SCL 4 4 I Serial clock input terminal — clock signal
INT 5 5 O Level or SMB Alert interrupt — open drain
SDA 6 6 I/O Serial data I/O terminal — serial data I/O
Pin Assignments
Vdd 1
ADDR SEL 2
GND 3
6 SDA
5 INT
4 SCL
6 SDA
5 INT
4 SCL
V
dd 1
ADDR SEL 2
GND 3
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TSL2580, TSL2581 − Pin Assignments
Detailed Description
The TSL2580 and TSL2581 are second-generation ambient light
sensor devices. Each contains two integrating analog-to-digital
converters (ADC) that integrate currents from two photodiodes.
Integration of both channels occurs simultaneously. Upon
completion of the conversion cycle, the conversion result is
transferred to the Channel 0 and Channel 1 data registers,
respectively. The transfers are double-buffered to ensure that
the integrity of the data is maintained. After the transfer, the
device automatically begins the next integration cycle.
Communication to the device is accomplished through a
standard, two-wire SMBus or I²C serial bus. Consequently, the
TSL258x device can be easily connected to a microcontroller or
embedded controller. No external circuitry is required for signal
conditioning, thereby saving PCB real estate as well. Since the
output of the TSL258x device is digital, the output is effectively
immune to noise when compared to an analog signal.
The TSL258x devices also support an interrupt feature that
simplifies and improves system efficiency by eliminating the
need to poll a sensor for a light intensity value. The primary
purpose of the interrupt function is to detect a meaningful
change in light intensity. The concept of a meaningful change
can be defined by the user both in terms of light intensity and
time, or persistence, of that change in intensity. The TSL258x
devices have the ability to define a threshold above and below
the current light level. An interrupt is generated when the value
of a conversion exceeds either of these limits.
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TSL2580, TSL2581 − Absolute Maximum Ratings
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. These are stress
ratings only, and functional operation of the device at these or
any other conditions beyond those indicated under
Recommended Operating Conditions is not implied. Exposure
to absolute-maximum-rated conditions for extended periods
may affect device reliability.
Figure 6:
Absolute Maximum Ratings Over Operating Free-Air Temperature Range (unless otherwise noted)
Note(s):
1. All voltages are with respect to GND.
Symbol Parameter Min Max Units
VDD(1) Supply voltage 3.8 V
VODigital output voltage range -0.5 3.8 V
IODigital output current -1 20 mA
Tstrg Storage temperature range -40 85 ºC
ESDHBM ESD tolerance, human body model ±2000 V
Absolute Maximum Ratings
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TSL2580, TSL2581 − Electrical Characteristics
Figure 7:
Recommended Operating Conditions
Note(s):
1. Meets SMB specifications.
2. Meets I²C specifications where VDD = VBUS.
Figure 8:
Electrical Characteristics Over Recommended Operating Free-Air Temperature Range
Figure 9:
Operating Characteristics; VDD = 3 V, TA = 25ºC (unless otherwise noted) (1) (2) (3) (4)
Symbol Parameter Min Nom Max Unit
VDD Supply voltage 2.7 3 3.6 V
TAOperating free-air temperature -30 70 ºC
VIL SCL, SDA input low voltage
TSL2580(1) 0.8
V
TSL2581(2) 0.3 VDD
VIH SCL, SDA input high voltage
TSL2580(1) 2
V
TSL2581(2) 0.7 VDD
Symbol Parameter Test Conditions Min Typ Max Unit
IDD Supply current
Active 175 250 A
Power down 3 10 A
VOL INT, SDA output low voltage
3mA sink current 0 0.4 V
6mA sink current 0 0.6 V
ILEAK Leakage current -5 5 A
Parameter Test Conditions Channel Min Typ Max Unit
Oscillator
frequency fOSC 705 750 795 kHz
Dark ADC count
value
Ee = 0, ITIME = 0xB6 (200 ms),
gain=16x
CH0 0 1 5
counts
CH1 0 1 5
Electrical Characteristics
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TSL2580, TSL2581 − Electrical Characteristics
Note(s):
1. Optical measurements are made using small-angle incident radiation from light-emitting diode optical sources. Visible 640 nm LEDs
and infrared 850 nm LEDs are used for final product testing for compatibility with high-volume production.
2. The 625 nm irradiance Ee is supplied by an AlInGaP light-emitting diode with the following characteristics: peak wavelength λp =
625 nm and spectral halfwidth Δλ½ = 20 nm.
3. The 850 nm irradiance Ee is supplied by a light-emitting diode with the following characteristics: peak wavelength
λp = 850 nm and spectral halfwidth Δλ½ = 42 nm.
4. The integration time Tint, is dependent on internal oscillator frequency (fosc) and on the number of integration cycles (ITIME) in the
Timing Register (0xFF) as described in the Register section. For nominal fosc = 750 kHz, nominal Tint = 2.7 ms × ITIME.
Full scale ADC
count value
ITIME = 0xDB (100 ms)
CH0 37887
counts
CH1 37887
ITIME = 0x6C (400 ms)
CH0 65535
CH1 65535
ADC count value
λp = 625 nm, ITIME = 0xF6 (27 ms),
Ee = 171.6 μW/cm2, gain = 16x
CH0 4000 5000 6000
counts
CH1 700
λp = 850 nm, ITIME = 0xF6 (27 ms),
Ee = 220 μW/cm2, gain = 16x
CH0 4000 5000 6000
CH1 2750
ADC count value
ratio: CH1/CH0
λp = 625 nm 10.8 15.8 20.8
%
λp = 850 nm 41 55 68
Irradiance
responsivity Re
λp = 625 nm, ITIME = 0xF6 (27 ms) CH0 29.1
counts/
(
μ
W/cm
2
)
CH1 4
λp = 850 nm, ITIME = 0xF6 (27 ms) CH0 22.8
CH1 12.5
Gain scaling
(relative to 1x)
8x
CH0 7 8 9
x
CH1 7 8 9
16x
CH0 15 16 17
CH1 15 16 17
111x
CH0 97 107 115
CH1 100 115 125
Parameter Test Conditions Channel Min Typ Max Unit
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TSL2580, TSL2581 − Electrical Characteristics
Figure 10:
AC Electrical Characteristics; VDD = 3 V, TA = 25°C, (unless otherwise noted)
Note(s):
1. Specified by design and characterization; not production tested.
Symbol Parameter(1) Min Typ Max Unit
t(CONV) Conversion time 2.7 688 ms
f(SCL) Clock frequency (I²C only) 0 400 kHz
Clock frequency (SMBus only) 10 100 kHz
t(BUF) Bus free time between start and stop condition 1.3 μs
t(HDSTA) Hold time after (repeated) start condition. After this
period, the first clock is generated. 0.6 μs
t(SUSTA) Repeated start condition setup time 0.6 μs
t(SUSTO) Stop condition setup time 0.6 μs
t(HDDAT) Data hold time 0 0.9 μs
t(SUDAT) Data setup time 100 ns
t(LOW) SCL clock low period 1.3 μs
t(HIGH) SCL clock high period 0.6 μs
t(TIMEOUT) Detect clock/data low timeout (SMBus only) 25 35 ms
tF Clock/data fall time 300 ns
tR Clock/data rise time 300 ns
Ci Input pin capacitance 10 pF
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TSL2580, TSL2581 − Electrical Characteristics
Parameter Measurement Information
Figure 11:
Timing Diagrams
Figure 12:
Example Timing Diagram for SMBus Send Byte Format
SDA
SCL
StopStart
SCL
ACK
t
(LOWMEXT)
t
(LOWMEXT)
t
(LOWSEXT)
SCL
ACK
t
(LOWMEXT)
Start
Condition
Stop
Condition
P
SDA
t
(SUSTO)
t
(SUDAT)
t
(HDDAT)
t
(BUF)
V
IH
V
IL
SCL
t
(SUSTA)
t
(HIGH)
t
(F)
t
(R)
t
(HDSTA)
t
(LOW)
V
IH
V
IL
PSS
A0A1A2A3A4A5A6
SCL
Start by
Master
SDA
1919
D1D2D3D4D5D6D7 D0R/W
Frame 1 SMBus Slave Address Byte Frame 2 Command Byte
ACK by
TSL258x
Stop by
Master
ACK by
TSL258x
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TSL2580, TSL2581 − Electrical Characteristics
Figure 13:
Example Timing Diagram for SMBus Receive Byte Format
A0A1A2A3A4A5A6
SCL
Start by
Master
SDA
1919
D1D2D3D4D5D6D7 D0R/W
Frame 1 SMBus Slave Address Byte Frame 2 Data Byte From TSL258x
ACK by
TSL258x
Stop by
Master
NACK by
Master
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TSL2580, TSL2581 − Typical Characteristics
Figure 14:
Spectral Responsivity
Figure 15:
Normalized Responsivity vs. Angular Displacement
Typical Characteristics
λ − Wavelength − nm
0
400
0.2
0.4
0.6
0.8
1
500 600 700 800 900 1000 1100
Normalized Responsivity
300
Ch 0
Ch 1
− Angular Displacement − °
Normalized Responsivity
0
0.2
0.4
0.6
0.8
1.0
−90 −60 −30 0 30 60 90
Optical Axis
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TSL2580, TSL2581 − Principles Of Operation
Analog-to-Digital Converter
The TSL258x contains two integrating analog-to-digital
converters (ADC) that integrate the currents from the channel
0 and channel 1 photodiodes. Integration of both channels
occurs simultaneously, and upon completion of the conversion
cycle the conversion result is transferred to the channel 0 and
channel 1 data registers, respectively. The transfers are double
buffered to ensure that invalid data is not read during the
transfer. After the transfer, the device automatically begins the
next integration cycle.
Digital Interface
Interface and control of the TSL258x is accomplished through
a two-wire serial interface to a set of registers that provide
access to device control functions and output data. The serial
interface is compatible with System Management Bus (SMBus)
versions 1.1 and 2.0, and I²C bus Fast-Mode. The TSL258x offers
three slave addresses that are selectable via an external pin
(ADDR SEL). The slave address options are shown in Figure 16.
Figure 16:
Slave Address Selection
Note(s):
1. The Slave and SMB Alert Addresses are 7 bits. Please note the SMBus and I²C protocols on pages 10 through 12. A read/write bit
should be appended to the slave address by the master device to properly communicate with the TSL258x device.
Address SEL Terminal Level Slave Address SMB Alert Address
GND 0101001 0001100
Float 0111001 0001100
VDD 1001001 0001100
Principles Of Operation
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TSL2580, TSL2581 − Principles Of Operation
SMBus and I²C Protocols
Each Send and Write protocol is, essentially, a series of bytes. A
byte sent to the TSL258x with the most significant bit (MSB)
equal to 1 will be interpreted as a COMMAND byte. The lower
four bits of the COMMAND byte form the register select address
(see Figure 26), which is used to select the destination for the
subsequent byte(s) received. The TSL258x responds to any
Receive Byte requests with the contents of the register specified
by the stored register select address.
The TSL2580 implements the following protocols of the SMB 2.0
specification:
•Send Byte Protocol
•Receive Byte Protocol
•Write Byte Protocol
•Write Word Protocol
•Read Word Protocol
•Block Write Protocol
•Block Read Protocol
The TSL2581 implements the following protocols of the Philips
Semiconductor I²C specification:
•I²C Write Protocol
•I²C Read (Combined Format) Protocol
When an SMBus Block Write or Block Read is initiated (see
description of Command Register), the byte following the
COMMAND byte is ignored but is a requirement of the SMBus
specification. This field contains the byte count (i.e. the number
of bytes to be transferred). The TSL2580 (SMBus) device ignores
this field and extracts this information by counting the actual
number of bytes transferred before the Stop condition is
detected.
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TSL2580, TSL2581 − Principles Of Operation
When an I²C Write or I²C Read (Combined Format) is initiated,
the byte count is also ignored but follows the SMBus protocol
specification. Data bytes continue to be transferred from the
TSL2581 (I²C) device to Master until a NACK is sent by the Master.
The data formats supported by the TSL2580 and TSL2581
devices are:
•Master transmitter transmits to slave receiver (SMBus and
I²C):
• The transfer direction in this case is not changed.
•Master reads slave immediately after the first byte (SMBus
only):
• At the moment of the first acknowledgment
(provided by the slave receiver) the master
transmitter becomes a master receiver and the slave
receiver becomes a slave transmitter.
•Combined format (SMBus and I²C):
• During a change of direction within a transfer, the
master repeats both a START condition and the slave
address but with the R/W bit reversed. In this case, the
master receiver terminates the transfer by generating
a NACK on the last byte of the transfer and a STOP
condition.
For a complete description of SMBus protocols, please review
the SMBus Specification at:
http://www.smbus.org/specs
For a complete description of I²C protocols, please review the
I²C Specification at:
www.nxp.com
Figure 17:
SMBus and I²C Packet Protocol Element Key
Wr
7
Data ByteSlave AddressS
1
APA
811 11
XX
AAcknowledge (this bit position may be 0 for an ACK or 1 for a NACK)
PStop Condition
Rd Read (bit value of 1)
SStart Condition
Sr Repeated Start Condition
Wr Write (bit value of 0)
XShown under a field indicates that that field is required to have a value of X
... Continuation of protocol
Master-to-Slave
Slave-to-Master
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Figure 18:
SMBus Send Byte Protocol
Figure 19:
SMBus Receive Byte Protocol
Figure 20:
SMBus Write Byte Protocol
Figure 21:
SMBus Read Byte Protocol
Figure 22:
SMBus Write Word Protocol
Wr
7
Data ByteSlave AddressS
1
APA
811 11
Rd
7
Data ByteSlave AddressS
1
APA
811 11
1
Wr
7
Data ByteSlave AddressS
1
AAA
811 1 8
Command Code
1
P
1
Wr
7
Data Byte LowSlave AddressS
1
A A
811 1
Command Code
1
P
811
Rd
Slave AddressS A A
7 1 1
1
Wr
7
Data Byte LowSlave AddressS
1
AAA
811 1 8
Command Code
1
PData Byte High A
811
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TSL2580, TSL2581 − Principles Of Operation
Figure 23:
SMBus Read Word Protocol
Figure 24:
SMBus Block Write or I²C Write Protocols
Note(s):
1. The I²C write protocol does not use the Byte Count packet, and the Master will continue sending Data Bytes until the Master initiates
a Stop condition. See Command Register for additional information regarding the Block Read/Write protocol.
Figure 25:
SMBus Block Read or I²C Read (Combined Format) Protocols
Note(s):
1. The I²C read protocol does not use the Byte Count packet, and the Master will continue receiving Data Bytes until the Master initiates
a Stop Condition. See Command Register for additional information regarding the Block Read/Write protocol.
Wr
7
Data Byte LowSlave AddressS
1
A A
811 1
Command Code
1
P
Data Byte High A
811
Rd
Slave AddressS A A
...
7 1
811
1
Wr
8
Data Byte 1Slave AddressS
1
A A
811 1
Command Code
P
Data Byte N A
811
Byte Count = N A A
...
7
811
Data Byte 2 A
81
...
Wr
7
Byte Count = NSlave AddressS
1
A A
811 1
Command Code
P
Data Byte N A
811
Slave Address A A
...
7
811
Data Byte 2 A
81
...
Data Byte 1 A
81
1
Sr
1
Rd
1
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TSL2580, TSL2581 − Register Set
The TSL258x is controlled and monitored by sixteen registers
and a command register accessed through the serial interface.
These registers provide for a variety of control functions and
can be read to determine results of the ADC conversions. The
register set is summarized in Figure 26.
Figure 26:
Register Address
The mechanics of accessing a specific register depends on the
specific SMB protocol used. See the section on SMBus protocols,
above. In general, the COMMAND register is written first to
specify the specific control/status register for following
read/write operations.
Address Register Name Register Function R/W
−− COMMAND Specifies register address W
00h CONTROL Control of basic functions
R/W
01h TIMING Integration time/gain control
02h INTERRUPT Interrupt control
03h THLLOW Low byte of low interrupt threshold
04h THLHIGH High byte of low interrupt threshold
05h THLLOW Low byte of high interrupt threshold
06h THLHIGH High byte of high interrupt threshold
07h ANALOG Analog control register
12h ID Part number / Rev ID
R
13h CONSTANT Number 4 (for SMBus block reads)
14h DATA0LOW ADC channel 0 LOW data register
15h DATA0HIGH ADC channel 0 HIGH data register
16h DATA1LOW ADC channel 1 LOW data register
17h DATA1HIGH ADC channel 1 HIGH data register
18h TIMERLOW Manual integration timer LOW register
19h TIMERHIGH Manual integration timer HIGH register
Register Set
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TSL2580, TSL2581 − Register Set
Command Register
The command register specifies the address of the target
register for subsequent read and write operations and contains
eight bits as described in Figure 27. The command register
defaults to 00h at power on.
Figure 27:
Command Register
76543210
CMD TRANSACTION ADDRESS
Field Bits Description
CMD 7 Select Command Register. Must write as 1 when addressing COMMAND register.
TRANSACTION 6:5
Selects type of transaction to follow in subsequent data transfers:
FIELD VALUE TRANSACTION DESCRIPTION
00 Byte protocol SMB read/write byte protocol
01 Word protocol SMB read/write word protocol
10 Block protocol SMB and I²C read/write block protocol.
Regarding SMBus block transfer, see note
below.
11 Special function Specifies a special command function in
the ADDRESS field (see below).
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TSL2580, TSL2581 − Register Set
Note(s):
1. An I²C block transaction will continue until the Master sends a stop condition. See Figure 24 and Figure 25. Unlike the I²C protocol,
the SMBus read/write protocol requires a Byte Count. All four ADC Channel Registers (14h through 17h) can be read simultaneously
in a single SMBus transaction. This is the only 32-bit data block supported by the TSL258x SMBus protocol. The TRANSACTION Field
Value must be set to 10b, and a read condition should be initiated with a COMMAND CODE of D3h. By using a COMMAND CODE of
D3h during an SMBus Block Read Protocol, the TSL258x device will automatically insert the appropriate Byte Count (Byte Count =
4) as illustrated in Figure 25. A write condition should not be used in conjunction with the 13h register.
2. Only the Send Byte Protocol should be used when clearing interrupts.
ADDRESS 4:0
Register Address/Special Function. This field selects the specific control or status
register for following write and read commands according to Figure 26. When the
TRANSACTION field is set to 11b, this field specifies a special command function as
outlined below.
FIELD VALUE SPECIAL
FUNCTION DESCRIPTION
00000 Reserved Reserved. Write as 0000b.
00001 Interrupt clear Clear any pending interrupt and is a
write−once−to−clear bit
00010 Stop manual
integration
When the Timing Register is set to 00h, a
SendByte command with the ADDRESS
field set to 0010b will stop a manual
integration. The actual length of the
integration cycle may be read in the
MANUAL INTEGRATION TIMER Register.
00011 Start manual
integration
When the Timing Register is set to 00h, a
SendByte command with the ADDRESS
field set to 0011b will start a manual
integration. The actual length of the
integration cycle may be read in the
MANUAL INTEGRATION TIMER Register.
x11xx Reserved Reserved. Write as 11xxb.
Field Bits Description
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TSL2580, TSL2581 − Register Set
Control Register (00h)
The CONTROL register primarily used to power the TSL258x
device up and down as shown in Figure 28.
Figure 28:
Control Register
Note(s):
1. ADC_EN and POWER must be asserted before the ADC changes will operate correctly. After POWER is asserted, a 2-ms delay is
required before asserting ADC_EN.
2. The TSL258x device registers should be configured before ADC_EN is asserted.
76543210
Resv Resv ADC_INTR ADC_VALID Resv Resv ADC_EN POWER
Field Bits Description
Resv 7:6 Reserved. Write as 0.
ADC_INTR 5 ADC Interrupt. Read only. Indicates that the device is asserting an interrupt.
ADC_VALID 4 ADC Valid. Read only. Indicates that the ADC channel has completed an
integration cycle.
Resv 3 Reserved. Write as 0.
Resv 2 Reserved. Write as 0.
ADC_EN 1 ADC Enable. This field enables the two ADC channels to begin integration.
Writing a 1 activates the ADC channels, and writing a 0 disables the ADCs.
POWER 0 Power On. Writing a 1 powers on the device, and writing a 0 turns it off.
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TSL2580, TSL2581 − Register Set
Timing Register (01h)
The TIMING register controls the internal integration time of the
ADC channels in 2.7 ms increments. The TIMING register
defaults to 00h at power on.
Figure 29:
Timing Register
Note(s):
1. The Send Byte protocol cannot be used when ITIME is greater than 127 (for example ITIME[7] = 1) since the upper bit is set aside for
write transactions in the COMMAND register.
76543210
ITIME
Field Bits Description
ITIME 7:0
Integration Cycles. Specifies the integration time in 2.7-ms intervals. Time is expressed
as a 2’s complement number. So, to quickly work out the correct value to write: (1)
determine the number of 2.7-ms intervals required, and (2) then take the 2’s
complement. For example, for a 1 × 2.7-ms interval, 0xFF should be written. For 2 ×
2.7-ms intervals, 0xFE should be written. The maximum integration time is 688.5 ms
(00000001b).
Writing a 0x00 to this register is a special case and indicates manual timing mode. See
CONTROL and MANUAL INTEGRATION TIMER Registers for other device options related
to manual integration.
INTEG_CYCLES TIME VALUE
− Manual integration 00000000
1 2.7 ms 11111111
2 5.4 ms 11111110
19 51.3 ms 11101101
37 99.9 ms 11011011
74 199.8 ms 10110110
148 399.6 ms 01101100
255 688.5 ms 00000001
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TSL2580, TSL2581 − Register Set
Interrupt Register (02h)
The INTERRUPT register controls the extensive interrupt
capabilities of the device. The open-drain interrupt pin is active
low and requires a pull-up resistor to VDD in order to pull high
in the inactive state. The TSL258x permits both SMB-Alert style
interrupts as well as traditional level style interrupts. The
Interrupt Register provides control over when a meaningful
interrupt will occur. The concept of a meaningful change can
be defined by the user both in terms of light intensity and time,
or persistence of that change in intensity. The value must cross
the threshold (as configured in the Threshold Registers 03h
through 06h) and persist for some period of time as outlined in
Figure 30.
When a level Interrupt is selected, an interrupt is generated
whenever the last conversion results in a value outside of the
programmed threshold window. The interrupt is active-low and
remains asserted until cleared by writing an 11 in the
TRANSACTION field in the COMMAND register.
In SMB-Alert mode, the interrupt is similar to the traditional
level style and the interrupt line is asserted low. To clear the
interrupt, the host responds to the SMB-Alert by performing a
modified Receive Byte operation, in which the Alert Response
Address (ARA) is placed in the slave address field, and the
TSL258x that generated the interrupt responds by returning its
own address in the seven most significant bits of the receive
data byte. If more than one device connected on the bus has
pulled the SMBAlert line low, the highest priority (lowest
address) device will win control of the bus during the slave
address transfer. If the device loses this arbitration, the
interrupt will not be cleared. The Alert Response Address is 0Ch.
When INTR = 11, the interrupt is generated immediately
following the SMBus write operation. Operation then behaves
in an SMB-Alert mode, and the software set interrupt may be
cleared by an SMB-Alert cycle.
Note(s): Interrupts are based on the value of Channel 0 only.
Page 24 ams Datasheet
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TSL2580, TSL2581 − Register Set
Figure 30:
Interrupt Control Register
Note(s):
1. Use this bit to isolate a particular condition when the sensor is continuously integrating.
Figure 31:
Interrupt Control Select
Note(s):
1. Field value of 11 may be used to test interrupt connectivity in a system or to assist in debugging interrupt service routine software.
76543210
Resv INTR_STOP INTR PERSIST
Field Bits Description
Resv 7 Reserved. Write as 0.
INTR_STOP 6
Stop ADC integration on interrupt. When high, ADC integration will stop
once an interrupt is asserted. To resume operation (1) de-assert ADC_EN
using CONTROL register, (2) clear interrupt using COMMAND register,
and (3) re-assert ADC_EN using CONTROL register. (1)
INTR 5:4
INTR Control Select. This field determines mode of interrupt logic
according to Figure 31, below.
PERSIST 3:0
Interrupt persistence. Controls rate of interrupts to the host processor as
shown in Figure 32, below.
Intr Field Value Read Value
00 Interrupt output disabled
01 Level Interrupt
10 SMBAlert compliant
11 Test Mode: Sets interrupt and functions as mode 10
ams Datasheet Page 25
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TSL2580, TSL2581 − Register Set
Figure 32:
Interrupt Persistence Select
Persist Field Value Interrupt Persist Function
0000 Every ADC cycle generates interrupt
0001 Any value outside of threshold range
0010 2 integration time periods out of range
0011 3 integration time periods out of range
0100 4 integration time periods out of range
0101 5 integration time periods out of range
0110 6 integration time periods out of range
0111 7 integration time periods out of range
1000 8 integration time periods out of range
1001 9 integration time periods out of range
1010 10 integration time periods out of range
1011 11 integration time periods out of range
1100 12 integration time periods out of range
1101 13 integration time periods out of range
1110 14 integration time periods out of range
1111 15 integration time periods out of range
Page 26 ams Datasheet
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TSL2580, TSL2581 − Register Set
Interrupt Threshold Register (03h - 06h)
The interrupt threshold registers store the values to be used as
the high and low trigger points for the comparison function for
interrupt generation. If the value generated by channel 0
crosses below or is equal to the low threshold specified, an
interrupt is asserted on the interrupt pin. If the value generated
by channel 0 crosses above the high threshold specified, an
interrupt is asserted on the interrupt pin. Registers THLLOW and
THLHIGH provide the low byte and high byte, respectively, of
the lower interrupt threshold. Registers THHLOW and THHHIGH
provide the low and high bytes, respectively, of the upper
interrupt threshold. The high and low bytes from each set of
registers are combined to form a 16-bit threshold value. The
interrupt threshold registers default to 00h on power up.
Figure 33:
Interrupt Threshold Register
Note(s):
1. Since two 8-bit values are combined for a single 16-bit value for each of the high and low interrupt thresholds, the Send Byte protocol
should not be used to write to these registers. Any values transferred by the Send Byte protocol with the MSB set would be interpreted
as the COMMAND field and stored as an address for subsequent read/write operations and not as the interrupt threshold information
as desired. The Write Word protocol should be used to write byte-paired registers. For example, the THLLOW and THLHIGH registers
(as well as the THHLOW and THHHIGH registers) can be written together to set the 16-bit ADC value in a single transaction.
Register Address Bits Description
THLLOW 3h 7:0 ADC channel 0 lower byte of the low threshold
THLHIGH 4h 7:0 ADC channel 0 upper byte of the low threshold
THHLOW 5h 7:0 ADC channel 0 lower byte of the high threshold
THHHIGH 6h 7:0 ADC channel 0 upper byte of the high threshold
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TSL2580, TSL2581 − Register Set
Analog Register (07h)
The ANALOG register provides eight bits of control to the
analog block. These bits control the analog gain settings of the
device.
Figure 34:
Analog Register
ID Register (12h)
The ID register provides the value for both the part number and
silicon revision number for that part number. It is a read-only
register whose value never changes.
Figure 35:
ID Register
76 5 4321 0
RESV GAIN
Field Bits Description
Reserved 7:3 Reserved. Write as 0.
Gain 2:0
Gain Control. Sets the analog gain of the device according to the following table.
FIELD VALUE GAIN VALUE
X00 1x
X01 8x
X10 16x
X11 111x
76 5 4321 0
PARTNO REVNO
Field Bits Description
PARTNO 7:4 Part Number Identification: field value 1000b = TSL2580, field value 1001b = TSL2581
REVNO 3:0 Revision number identification
Page 28 ams Datasheet
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TSL2580, TSL2581 − Register Set
Constant (13h)
The CONSTANT register provides a means to facilitate SMBus
block transfers that is used as the Byte Count in the SMBus
protocol. For example, all four ADC Channel Data Registers can
be read in a single SMBus block transfer if an SMBus Block Read
is initiate at address 13h. This register defaults to the constant
4, but may be set to other values depending upon the end
application. For example, if manual integration is employed and
the register is set to 5, then all four ADC Channel Data Registers
and the Manual Integration Timer Register can be read in a
single SMBus read block transaction.
Figure 36:
Constant Register
ADC Channel Data Registers (14h - 17h)
The ADC channel data are expressed as 16-bit values spread
across two registers. The ADC channel 0 data registers,
DATA0LOW and DATA0HIGH provide the lower and upper bytes,
respectively, of the ADC value of channel 0. Registers
DATA1LOW and DATA1HIGH provide the lower and upper bytes,
respectively, of the ADC value of channel 1. All channel data
registers are read-only and default to 00h on power up.
Figure 37:
ADC Channel Data Registers
76 5 4321 0
CONSTANT
Field Bits Description
CONSTANT 7:0
Constant value used as the byte count for SMBus block read/write transactions. I²C
protocol does not use the byte count field in the block transaction, so this register
should be ignored if an TSL2581 device is used.
Register Address Bits Description
DATA0LOW 14h 7:0 ADC channel 0 lower byte
DATA0HIGH 15h 7:0 ADC channel 0 upper byte
DATA1LOW 16h 7:0 ADC channel 1 lower byte
DATA1HIGH 17h 7:0 ADC channel 1 upper byte
ams Datasheet Page 29
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TSL2580, TSL2581 − Register Set
The upper byte data registers can only be read following a read
to the corresponding lower byte register. When the lower byte
register is read, the upper eight bits are strobed into a shadow
register, which is read by a subsequent read to the upper byte.
The upper register will read the correct value even if additional
ADC integration cycles end between the reading of the lower
and upper registers.
Note(s): The Read Word protocol can be used to read
byte-paired registers. For example, the DATA0LOW and
DATA0HIGH registers (as well as the DATA1LOW and DATA1HIGH
registers) may be read together to obtain the 16-bit ADC value
in a single transaction
Manual Integration Timer (18h - 19h)
The MANUAL INTEGRATION TIMER registers provide the number
of cycles in 10.9 μs increments that occurred during a manual
start/stop integration period. The timer is expressed as a 16-bit
value across two registers. See Control Register (00h) and
Timing Register (01h) for further instructions in configuring a
manual integration. The maximum time that can be derived
without an overflow is 714.3 ms.
Figure 38:
Manual Integration Timer Registers
76 5 4321 0
TIMER
Register Address Bits Description
TIMERLOW 18h 7:0 Manual Integration Timer lower byte
TIMERHIGH 19h 7:0 Manual Integration Timer upper byte
Page 30 ams Datasheet
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TSL2580, TSL2581 − Application Information: Software
Basic Operation
After applying VDD, the device will initially be in the
power-down state. To operate the device, issue a command to
access the CONTROL register followed by the data value 01h to
the CONTROL register to power up the device. The TIMING
register should be configured for the preferred integration
period, and then the ADC_EN should be set to 1 to enable both
ADC channels.
Figure 39:
State Diagram
Application Information:
Software
(ADC_EN = 1
Power =1)
EXT
PWR
POWER
DOWN
NO
YES
ACTIVE
(ADC_EN = 0
Power = 1)
ALS
(Power = 0)
ams Datasheet Page 31
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TSL2580, TSL2581 − Application Information: Software
The following pseudo code illustrates a procedure for reading
the TSL258x device (ALS) using word transactions:
Command = 0x80 //Set Command bit and Control Reg
Power_On = 0x01
//Power on device
WriteByte (Address, Command, Power_On)
Command = 0x81 //Set Command bit and ALS Timing Reg
ITIME = 0xb6 //200 ms integration cycle
//Configure ALS Timing Register for 200 ms integration cycle
WriteByte (Address, Command, ITIME)
Command = 0x80 //Set Command bit and Control Reg
ADC_En = 0x03 //Enable ADC Channels
//Keep device powered on and enable ADC prior to reading channel data
WriteByte (Address, Command, ADC_En | Power_On)
// Read ADC Channels Using Read Word Protocol - RECOMMENDED
//Address the Ch0 lower data register and configure for Read Word
Command = 0Xb4 //Set Command bit and Word bit
//Reads two bytes from sequential registers 0x14 and 0x15
//Results are returned in DataLow and DataHigh variables
ReadWord (Address, Command, DataLow, DataHigh)
Channel0 = 256 * DataHigh + DataLow
//Address the Ch1 lower data register and configure for Read Word
Command = 0xb6 //Set Command bit and Word bit
//Reads two bytes from sequential registers 0x16 and 0x17
//Results are returned in DataLow and DataHigh variables
ReadWord (Address, Command, DataLow, DataHigh)
Channel1 = 256 * DataHigh + DataLow //Shift DataHigh to upper byte
Page 32 ams Datasheet
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TSL2580, TSL2581 − Application Information: Software
Interrupts
The interrupt feature of the TSL258x device simplifies and
improves system efficiency by eliminating the need to poll the
sensor for a light intensity value. Interrupt mode is determined
by the INTR field in the INTERRUPT CONTROL Register. The
interrupt feature may be disabled by writing a field value of 00h
to the Interrupt Control Register (02h) so that polling can be
performed.
The versatility of the interrupt feature provides many options
for interrupt configuration and usage. The primary purpose of
the interrupt function is to signal a meaningful change in light
intensity. However, it can also be used as an end-of-conversion
signal. The concept of a meaningful change can be defined by
the user both in terms of light intensity and time, or persistence,
of that change in intensity. The TSL258x device implements two
16-bit-wide interrupt threshold registers that allow the user to
define thresholds above and below a desired light level. An
interrupt will then be generated when the value of a conversion
exceeds either of these limits. For simplicity of programming,
the threshold comparison is accomplished only with Channel
0. This simplifies calculation of thresholds that are based, for
example, on a percent of the current light level. It is adequate to
use only one channel when calculating light intensity
differences because, for a given light source, the channel 0 and
channel 1 values are linearly proportional to each other and
thus both values scale linearly with light intensity.
To further control when an interrupt occurs, the TSL258x device
provides an interrupt persistence feature. This feature allows
the user to specify a number of conversion cycles for which a
light intensity exceeding either interrupt threshold must persist
before actually generating an interrupt. This can be used to
prevent transient changes in light intensity from generating an
unwanted interrupt. With a value of 1, an interrupt occurs
immediately whenever either threshold is exceeded. With
values of N, where N can range from 2 to 15, N consecutive
conversions must result in values outside the interrupt window
for an interrupt to be generated. For example, if N is equal to
10 and the integration time is 402 ms, then an interrupt will not
be generated unless the light level persists for more than 4
seconds outside the threshold.
Two different interrupt styles are available: Level and SMBus
Alert. The difference between these two interrupt styles is how
they are cleared. Both result in the interrupt line going active
low and remaining low until the interrupt is cleared. A level style
interrupt is cleared by selecting the Special Function in the
COMMAND register and writing a 0 to the Interrupt Clear field
value. The SMBus Alert style interrupt is cleared by an Alert
Response as described in the Interrupt Control Register section
and SMBus specification.
To configure the interrupt as an end-of-conversion signal so
that every ADC integration cycle generates an interrupt, the
interrupt PERSIST field in the Interrupt Control Register (02h) is
ams Datasheet Page 33
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TSL2580, TSL2581 − Application Information: Software
set to 0000b. Either Level or SMBus Alert style can be used. An
interrupt will be generated upon completion of each
conversion. The interrupt threshold registers are ignored.
Calculating Lux
The TSL258x is intended for use in ambient light detection
applications such as display backlight control, where
adjustments are made to display brightness or contrast based
on the brightness of the ambient light, as perceived by the
human eye. Conventional silicon detectors respond strongly to
infrared light, which the human eye does not see. This can lead
to significant error when the infrared content of the ambient
light is high, such as with incandescent lighting, due to the
difference between the silicon detector response and the
brightness perceived by the human eye.
This problem is overcome in the TSL258x through the use of
two photodiodes. One of the photodiodes (channel 0) is
sensitive to both visible and infrared light, while the second
photodiode (channel 1) is sensitive primarily to infrared light.
An integrating ADC converts the photodiode currents to digital
outputs. Channel 1 digital output is used to compensate for the
effect of the infrared component of light on the channel 0
digital output. The ADC digital outputs from the two channels
are used in a formula to obtain a value that approximates the
human eye response in the commonly used Illuminance unit of
Lux:
Chipscale Package
For CH1/CH0 = 0.00 to 0.25 Lux = 0.105 CH0 - 0.208 CH1
For CH1/CH0 = 0.25 to 0.38 Lux = 0.1088 CH0 - 0.2231 CH1
For CH1/CH0 = 0.38 to 0.45 Lux = 0.0729 CH0 - 0.1286 CH1
For CH1/CH0 = 0.45 to 0.60 Lux = 0.060 CH0 - 0.10 CH1
For CH1/CH0 > 0.60 Lux/CH0 = 0
ODFN Package
For CH1/CH0 = 0.00 to 0.30 Lux = 0.130 CH0 - 0.240 CH1
For CH1/CH0 = 0.30 to 0.38 Lux = 0.1649 CH0 - 0.3562 CH1
For CH1/CH0 = 0.38 to 0.45 Lux = 0.0974 CH0 - 0.1786 CH1
For CH1/CH0 = 0.45 to 0.54 Lux = 0.062 CH0 - 0.100 CH1
For CH1/CH0 > 0.54 Lux/CH0 = 0
The formulas shown above were obtained by optical testing
with fluorescent and incandescent light sources, and apply only
to open-air applications. Optical apertures (e.g. light pipes) will
affect the incident light on the device.
Page 34 ams Datasheet
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TSL2580, TSL2581 − Application Information: Software
Simplified Lux Calculation
Below is the argument and return value including source code
(shown on following page) for calculating lux with the
TSL2581FN. The source code is intended for embedded and/or
microcontroller applications. All floating point arithmetic
operations have been eliminated since embedded controllers
and microcontrollers generally do not support these types of
operations. Because floating point has been removed, scaling
must be performed prior to calculating illuminance if the
integration time is not 400 msec and/or if the gain is not 1x as
denoted in the source code on the following pages
//****************************************************************************
//
// Copyright ams AG
//
// THIS CODE AND INFORMATION IS PROVIDED ”AS IS” WITHOUT WARRANTY OF ANY
// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
// PURPOSE.
//
// Module Name:
// lux.cpp
//
//****************************************************************************
#define LUX_SCALE 16 // scale by 2^16
#define RATIO_SCALE 9 // scale ratio by 2^9
//---------------------------------------------------
// Integration time scaling factors
//---------------------------------------------------
#define CH_SCALE 16 // scale channel values by 2^16
#define NOM_INTEG_CYCLE 148 // Nominal 400 ms integration. See Timing Register
//---------------------------------------------------
// Gain scaling factors
//---------------------------------------------------
#define CH0GAIN128X 107 // 128X gain scalar for Ch0
#define CH1GAIN128X 115 // 128X gain scalar for Ch1
//---------------------------------------------------
// FN Package coefficients
//---------------------------------------------------
// For Ch1/Ch0=0.00 to 0.30:
//Lux=0.130*Ch0-0.240*Ch1
// For Ch1/Ch0=0.30 to 0.38:
// Lux=0.1649*Ch0-0.3562*Ch1
//
// For Ch1/Ch0=0.38 to 0.45:
ams Datasheet Page 35
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TSL2580, TSL2581 − Application Information: Software
// Lux=0.0974*Ch0-0.1786*Ch1
//
// For Ch1/Ch0=0.45 to 0.54:
// Lux=0.062*Ch0-0.10*Ch1
//
// For Ch1/Ch0>0.54:
// Lux/Ch0=0
//
//---------------------------------------------------
#define K1C 0x009A // 0.30 * 2^RATIO_SCALE
#define B1C 0x2148 // 0.130 * 2^LUX_SCALE
#define M1C 0x3d71 // 0.240 * 2^LUX_SCALE
#define K2C 0x00c3 // 0.38 * 2^RATIO_SCALE
#define B2C 0x2a37 // 0.1649 * 2^LUX_SCALE
#define M2C 0x5b30 // 0.3562 * 2^LUX_SCALE
#define K3C 0x00e6 // 0.45 * 2^RATIO_SCALE
#define B3C 0x18ef // 0.0974 * 2^LUX_SCALE
#define M3C 0x2db9 // 0.1786 * 2^LUX_SCALE
#define K4C 0x0114 // 0.54 * 2^RATIO_SCALE
#define B4C 0x0fdf // 0.062 * 2^LUX_SCALE
#define M4C 0x199a // 0.10 * 2^LUX_SCALE
#define K5C 0x0114 // 0.54 * 2^RATIO_SCALE
#define B5C 0x0000 // 0.00000 * 2^LUX_SCALE
#define M5C 0x0000 // 0.00000 * 2^LUX_SCALE
Page 36 ams Datasheet
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TSL2580, TSL2581 − Application Information: Software
// lux equation approximation without floating point calculations
//////////////////////////////////////////////////////////////////////////////
// Routine: unsigned int CalculateLux(unsigned int ch0, unsigned int ch0, int iType)
//
// Description: Calculate the approximate illuminance (lux) given the raw
// channel values of the TSL2581. The equation if implemented
// as a piece-wise linear approximation.
//
// Arguments: unsigned int iGain - gain, where 0:1X, 1:8X, 2:16X, 3:128X
// unsigned int tIntCycles - INTEG_CYCLES defined in Timing Register
// unsigned int ch0 - raw channel value from channel 0 of TSL2581
// unsigned int ch1 - raw channel value from channel 1 of TSL2581
// unsigned int iType - package type (1:CS)
//
// Return: unsigned int - the approximate illuminance (lux)
//
//////////////////////////////////////////////////////////////////////////////
unsigned int CalculateLux(unsigned int iGain, unsigned int tIntCycles, unsigned int ch0,
unsigned int ch1, int iType)
{
//------------------------------------------------------------------------
// first, scale the channel values depending on the gain and integration time
// 1X, 400ms is nominal setting
unsigned long chScale0;
unsigned long chScale1;
unsigned long channel1;
unsigned long channel0;
// No scaling if nominal integration (148 cycles or 400 ms) is used
if (tIntCycles == NOM_INTEG_CYCLE)
chScale0 = (1 << CH_SCALE);
else
chScale0 = (NOM_INTEG_CYCLE << CH_SCALE) / tIntCycles;
switch (iGain)
{
case 0: // 1x gain
chScale1 = chScale0; // No scale. Nominal setting
break;
case 1: // 8x gain
chScale0 = chScale0 >> 3; // Scale/multiply value by 1/8
chScale1 = chScale0;
break;
case 2: // 16x gain
chScale0 = chScale0 >> 4; // Scale/multiply value by 1/16
chScale1 = chScale0;
break;
case 3: // 128x gain
chScale1 = chScale0 / CH1GAIN128X; //Ch1 gain correction factor applied
ams Datasheet Page 37
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TSL2580, TSL2581 − Application Information: Software
chScale0 = chScale0 / CH0GAIN128X; //Ch0 gain correction factor applied
break;
}
// scale the channel values
channel0 = (ch0 * chScale0) >> CH_SCALE;
channel1 = (ch1 * chScale1) >> CH_SCALE;
//------------------------------------------------------------------------
// find the ratio of the channel values (Channel1/Channel0)
// protect against divide by zero
unsigned long ratio1 = 0;
if (channel0 != 0) ratio1 = (channel1 << (RATIO_SCALE+1)) / channel0;
// round the ratio value
unsigned long ratio = (ratio1 + 1) >> 1;
// is ratio <= eachBreak?
unsigned int b, m;
switch (iType)
{
case 1: // CS package
if ((ratio >= 0) && (ratio <= K1C))
{b=B1C; m=M1C;}
else if (ratio <= K2C)
{b=B2C; m=M2C;}
else if (ratio <= K3C)
{b=B3C; m=M3C;}
else if (ratio <= K4C)
{b=B4C; m=M4C;}
else if (ratio > K5C)
{b=B5C; m=M5C;}
break;
}
unsigned long temp;
unsigned long lux;
temp = ((channel0 * b) - (channel1 * m));
// round lsb (2^(LUX_SCALE-1))
temp += (1 << (LUX_SCALE-1));
// strip off fractional portion
lux = temp >> LUX_SCALE;
return(lux);
}
Page 38 ams Datasheet
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TSL2580, TSL2581 − Application Information: Hardware
Power Supply Decoupling and Application
Hardware Circuit
The power supply lines must be decoupled with a 0.1μF
capacitor placed as close to the device package as possible
(Figure 40). The bypass capacitor should have low effective
series resistance (ESR) and low effective series inductance (ESI),
such as the common ceramic types, which provide a low
impedance path to ground at high frequencies to handle
transient currents caused by internal logic switching.
Figure 40:
Bus Pull-Up Resistors
Pull-up resistors (Rp) maintain the SDAH and SCLH lines at a
high level when the bus is free and ensure the signals are pulled
up from a low to a high level within the required rise time. For
a complete description of the SMBus maximum and minimum
Rp values, please review the SMBus Specification at:
http://www.smbus.org/specs.
For a complete description of I²C maximum and minimum Rp
values, please review the I²C Specification at:
www.nxp.com
A pull-up resistor (RPI) is also required for the interrupt (INT),
which functions as a wired-AND signal in a similar fashion to
the SCL and SDA lines. A typical impedance value between
10 kΩ and 100 kΩ can be used. Please note that while Figure 40
shows INT being pulled up to VDD, the interrupt can optionally
be pulled up to VBUS.
Application Information:
Hardware
TSL2580/
TSL2581
VBUS VDD
0.1 F
RPRP
SCL
SDA
RPI
INT
ams Datasheet Page 39
[v1-00] 2016-Apr-05 Document Feedback
TSL2580, TSL2581 − Application Information: Hardware
PCB Pad Layouts
Suggested PCB pad layout guidelines for the CS chipscale
package are shown in Figure 41.
Figure 41:
Suggested CS Package PCB Layout
Note(s):
1. All linear dimensions are in millimeters.
2. This drawing is subject to change without notice.
Suggested PCB pad layout guidelines for the Dual Flat No-Lead
(FN) surface mount package are shown in Figure 42.
Figure 42:
Suggested FN Package PCB Layout
Note(s):
1. All linear dimensions are in millimeters.
2. This drawing is subject to change without notice.
0.50
6 0.21
0.50
0.50
0.40
2.3
0.40
0.9
1.70
0.65
0.9
0.65
Page 40 ams Datasheet
Document Feedback [v1-00] 2016-Apr-05
TSL2580, TSL2581 − Mechanical Data
Figure 43:
Package CS — Six-Lead Chipscale Packaging Configuration
Note(s):
1. All linear dimensions are in micrometers. Dimension tolerance is ± 25μm unless otherwise noted.
2. Solder bumps are formed of Sn (96.5%), Ag (3%), and Cu (0.5%).
3. The top of the photodiode active area is 410μm below the top surface of the package.
4. The layer above the photodiode is glass and epoxy with an index of refraction of 1.53.
5. This drawing is subject to change without notice.
Mechanical Data
PACKAGE CS Six-Lead Chipscale Device
1250
6 100
400 50
700 55
TYP 30
500
500
375 30
500
375 30
1750
TOP VIEW
SIDE VIEW
BOTTOM VIEW
END VIEW
6 210 30
1
2
3
6
5
4
PIN OUT
BOTTOM VIEW
Lead Free
Pb
Green
RoHS
ams Datasheet Page 41
[v1-00] 2016-Apr-05 Document Feedback
TSL2580, TSL2581 − Mechanical Data
Figure 44:
Package FN — Dual Flat No-Lead Packaging Configuration
Note(s):
1. All linear dimensions are in micrometers. Dimension tolerance is ±20 μm unless otherwise noted.
2. The photodiode active area is 466 μm square and its center is 140 μm above and 20μm to the right of the package center. The die
placement tolerance is ± 75 μm in any direction.
3. Package top surface is molded with an electrically nonconductive clear plastic compound having an index of refraction of 1.55.
4. Contact finish is copper alloy A194 with pre-plated NiPdAu lead finish.
5. This package contains no lead (Pb).
6. This drawing is subject to change without notice.
PACKAGE FN Dual Flat No-Lead
203 8
6 SDA
5 INT
4 SCL
Vdd 1
ADDR SEL 2
GND 3
TOP VIEW
SIDE VIEW
BOTTOM VIEW
Lead Free
Pb
300
50
650
2000
75
2000 75
PIN 1
PIN 1
END VIEW
650 50
Seating Plane
PIN OUT
TOP VIEW
Photo-Active Area
750 150
300 50
650
Green
RoHS
Page 42 ams Datasheet
Document Feedback [v1-00] 2016-Apr-05
TSL2580, TSL2581 − Mechanical Data
Figure 45:
Package CS Carrier Tape
Note(s):
1. All linear dimensions are in millimeters. Dimension tolerance is ±0.10 mm unless otherwise noted.
2. The dimensions on this drawing are for illustrative purposes only. Dimensions of an actual carrier may vary slightly.
3. Symbols on drawing Ao, Bo, and Ko are defined in ANSI EIA Standard 481-B 2001.
4. Each reel is 178 millimeters in diameter and contains 3500 parts.
5. ams packaging tape and reel conform to the requirements of EIA Standard 481-B.
6. In accordance with EIA standard, device pin 1 is located next to the sprocket holes in the tape.
7. This drawing is subject to change without notice.
TOP VIEW
DETAIL B
DETAIL A
1.35 0.05
A
o
1.85 0.05
B
o
0.97 0.05
K
o
0.250
0.02
5 Max 5 Max
4.00
8.00
3.50 0.05
1.50
4.00
2.00 0.05
+ 0.30
− 0.10
1.75
B
B
AA
0.60
0.05
ams Datasheet Page 43
[v1-00] 2016-Apr-05 Document Feedback
TSL2580, TSL2581 − Mechanical Data
Figure 46:
Package FN Carrier Tape
Note(s):
1. All linear dimensions are in millimeters. Dimension tolerance is ±0.10 mm unless otherwise noted.
2. The dimensions on this drawing are for illustrative purposes only. Dimensions of an actual carrier may vary slightly.
3. Symbols on drawing Ao, Bo, and Ko are defined in ANSI EIA Standard 481-B 2001.
4. Each reel is 178 millimeters in diameter and contains 3500 parts.
5. ams packaging tape and reel conform to the requirements of EIA Standard 481-B.
6. In accordance with EIA standard, device pin 1 is located next to the sprocket holes in the tape.
7. This drawing is subject to change without notice.
TOP VIEW
DETAIL A
2.18 0.05
Ao
0.254
0.02
5 Max
4.00
8.00
3.50 0.05
1.50
4.00
2.00 0.05
+ 0.30
− 0.10
1.75
B
B
AA
1.00
0.25
DETAIL B
2.18 0.05
Bo
5 Max
0.83 0.05
Ko
Page 44 ams Datasheet
Document Feedback [v1-00] 2016-Apr-05
TSL2580, TSL2581 − Manufacturing Information
The package has been tested and have demonstrated an ability
to be reflow soldered to a PCB substrate. The process,
equipment, and materials used in these test are detailed below.
The solder reflow profile describes the expected maximum heat
exposure of components during the solder reflow process of
product on a PCB. Temperature is measured on top of
component. The components should be limited to a maximum
of three passes through this solder reflow profile.
Figure 47:
TSL2580/81 Solder Reflow Profile
Figure 48:
TSL2580/TSL2581 Solder Reflow Profile Graph
Note(s):
1. Not to scale - for reference only.
Parameter Reference Device
Average temperature gradient in preheating 2.5°C/s
Soak time tsoak 2 to 3 minutes
Time above 217°C t1 Max 60 s
Time above 230°C t2 Max 50 s
Time above Tpeak −10°C t3 Max 10 s
Peak temperature in reflow Tpeak 260°C (-0°C/+5°C)
Temperature gradient in cooling Max −5°C/s
Manufacturing Information
t3
t2
t1
tsoak
T3
T2
T1
Tpeak
Not to scale — for reference o
Time (s)
Temperature (C)
ams Datasheet Page 45
[v1-00] 2016-Apr-05 Document Feedback
TSL2580, TSL2581 − Manufacturing Information
Moisture Sensitivity
Optical characteristics of the device can be adversely affected
during the soldering process by the release and vaporization of
moisture that has been previously absorbed into the package
molding compound. To ensure the package molding
compound contains the smallest amount of absorbed moisture
possible, each device is dry-baked prior to being packed for
shipping. Devices are packed in a sealed aluminized envelope
with silica gel to protect them from ambient moisture during
shipping, handling, and storage before use.
CS Package
The CS package has been assigned a moisture sensitivity level
of MSL 2 and the devices should be stored under the following
conditions:
•Temperature Range: 5ºC to 50ºC
•Relative Humidity: 60% maximum
•Floor Life: 1 year out of bag at ambient < 30°C / 60% RH
Rebaking will be required if the aluminized envelope has been
open for more than 1 year. If rebaking is required, it should be
done at 90ºC for 3 hours.
FN Package
The FN package has been assigned a moisture sensitivity level
of MSL 3 and the devices should be stored under the following
conditions:
•Temperature Range: 5ºC to 50ºC
•Relative Humidity: 60% maximum
•Total Time: 6 months from the date code on the
aluminized envelope — if unopened
•Opened Time: 168 hours or fewer
Rebaking will be required if the devices have been stored
unopened for more than 6 months or if the aluminized envelope
has been open for more than 168 hours. If rebaking is required,
it should be done at 90ºC for 4 hours.
Page 46 ams Datasheet
Document Feedback [v1-00] 2016-Apr-05
TSL2580, TSL2581 − Ordering & Contact Information
Figure 49:
Ordering Information
Buy our products or get free samples online at:
www.ams.com/ICdirect
Technical Support is available at:
www.ams.com/Technical-Support
Provide feedback about this document at:
www.ams.com/Document-Feedback
For further information and requests, e-mail us at:
ams_sales@ams.com
For sales offices, distributors and representatives, please visit:
www.ams.com/contact
Headquarters
ams AG
Tobelbaderstrasse 30
8141 Premstaetten
Austria, Europe
Tel: +43 (0) 3136 500 0
Website: www.ams.com
Ordering Code Device Interface Package - Leads Package Designator
TSL2580CS TSL2580 SMBus Chipscale−6 CS
TSL2580FN TSL2580 SMBus Dual Flat No-Lead−6 FN
TSL2581FN TSL2581 I²C Dual Flat No-Lead−6 FN
Ordering & Contact Information
ams Datasheet Page 47
[v1-00] 2016-Apr-05 Document Feedback
TSL2580, TSL2581 − RoHS Compliant & ams Green Statement
RoHS: The term RoHS compliant means that ams AG products
fully comply with current RoHS directives. Our semiconductor
products do not contain any chemicals for all 6 substance
categories, including the requirement that lead not exceed
0.1% by weight in homogeneous materials. Where designed to
be soldered at high temperatures, RoHS compliant products are
suitable for use in specified lead-free processes.
ams Green (RoHS compliant and no Sb/Br): ams Green
defines that in addition to RoHS compliance, our products are
free of Bromine (Br) and Antimony (Sb) based flame retardants
(Br or Sb do not exceed 0.1% by weight in homogeneous
material).
Important Information: The information provided in this
statement represents ams AG knowledge and belief as of the
date that it is provided. ams AG 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. ams AG 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. ams AG
and ams AG suppliers consider certain information to be
proprietary, and thus CAS numbers and other limited
information may not be available for release.
RoHS Compliant & ams Green
Statement
Page 48 ams Datasheet
Document Feedback [v1-00] 2016-Apr-05
TSL2580, TSL2581 − Copyrights & Disclaimer
Copyright ams AG, Tobelbader Strasse 30, 8141 Premstaetten,
Austria-Europe. Trademarks Registered. All rights reserved. The
material herein may not be reproduced, adapted, merged,
translated, stored, or used without the prior written consent of
the copyright owner.
Devices sold by ams AG are covered by the warranty and patent
indemnification provisions appearing in its General Terms of
Trade. ams AG makes no warranty, express, statutory, implied,
or by description regarding the information set forth herein.
ams AG reserves the right to change specifications and prices
at any time and without notice. Therefore, prior to designing
this product into a system, it is necessary to check with ams AG
for current information. This product is intended for use in
commercial applications. Applications requiring extended
temperature range, unusual environmental requirements, or
high reliability applications, such as military, medical
life-support or life-sustaining equipment are specifically not
recommended without additional processing by ams AG for
each application. This product is provided by ams AG “AS IS”
and any express or implied warranties, including, but not
limited to the implied warranties of merchantability and fitness
for a particular purpose are disclaimed.
ams AG shall not be liable to recipient or any third party for any
damages, including but not limited to personal injury, property
damage, loss of profits, loss of use, interruption of business or
indirect, special, incidental or consequential damages, of any
kind, in connection with or arising out of the furnishing,
performance or use of the technical data herein. No obligation
or liability to recipient or any third party shall arise or flow out
of ams AG rendering of technical or other services.
Copyrights & Disclaimer
ams Datasheet Page 49
[v1-00] 2016-Apr-05 Document Feedback
TSL2580, TSL2581 − Document Status
Document Status Product Status Definition
Product Preview Pre-Development
Information in this datasheet is based on product ideas in
the planning phase of development. All specifications are
design goals without any warranty and are subject to
change without notice
Preliminary Datasheet Pre-Production
Information in this datasheet is based on products in the
design, validation or qualification phase of development.
The performance and parameters shown in this document
are preliminary without any warranty and are subject to
change without notice
Datasheet Production
Information in this datasheet is based on products in
ramp-up to full production or full production which
conform to specifications in accordance with the terms of
ams AG standard warranty as given in the General Terms of
Trade
Datasheet (discontinued) Discontinued
Information in this datasheet is based on products which
conform to specifications in accordance with the terms of
ams AG standard warranty as given in the General Terms of
Trade, but these products have been superseded and
should not be used for new designs
Document Status
Page 50 ams Datasheet
Document Feedback [v1-00] 2016-Apr-05
TSL2580, TSL 2581 − Revision Information
Note(s):
1. Page and figure numbers for the previous version may differ from page and figure numbers in the current revision
2. Correction of typographical errors is not explicitly mentioned.
Changes from 098 (2010-Mar) to current revision 1-00 (2016-Apr-05) Page
Content of TAOS datasheet was updated to latest ams design
Updated Key Benefits & Features 2
Revision Information
ams Datasheet Page 51
[v1-00] 2016-Apr-05 Document Feedback
TSL2580, TSL2581 − Content Guide
1 General Description
2 Key Benefits & Features
2 Applications
3 Block Diagram
4 Pin Assignments
5 Detailed Description
6Absolute Maximum Ratings
7 Electrical Characteristics
10 Parameter Measurement Information
12 Typical Characteristics
13 Principles Of Operation
13 Analog-to-Digital Converter
13 Digital Interface
14 SMBus and I²C Protocols
18 Register Set
19 Command Register
21 Control Register (0x0F)
22 Timing Register (01h)
23 Interrupt Register (02h)
26 Interrupt Threshold Register (03h - 06h)
27 Analog Register (07h)
27 ID Register (12h)
28 Constant (13h)
28 ADC Channel Data Registers (14h - 17h)
29 Manual Integration Timer (18h - 19h)
30 Application Information: Software
30 Basic Operation
32 Interrupts
33 Calculating Lux
33 Chipscale Package
33 ODFN Package
34 Simplified Lux Calculation
38 Application Information: Hardware
38 Power Supply Decoupling and Application Hardware
Circuit
39 PCB Pad Layouts
40 Mechanical Data
44 Manufacturing Information
45 Moisture Sensitivity
45 CS Package
45 FN Package
46 Ordering & Contact Information
Content Guide
