TCS37717 TAOS | Alldatasheet
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ams Datasheet, Confidential Page 1 [v1-20] 2014-Aug-06 Document Feedback TCS3771 Color Light-To-Digital Converter with Proximity Sensing The TCS3771 family of devices provides red, green, blue, and clear (RGBC) light sensing an d proximity detection (when coupled with an external IR LED). They detect light intensity under a variety of lighting conditions and through a variety of attenuation materials. The proximity detection feature allows a large dynamic range of operation for use in short distance detection behind dark glass such as in a cell phone or for longer distance measurements for applications such as presence detection for monitors or lapt ops. The programmable proximity detection enables continuous measurements across the entire range. In addition, an internal state machine provides the ability to put the device into a low power mode in between RGBC and proximity measurements providing very low average power consumption. The TCS3771 is directly useful in lighting conditions containing minimal IR content such as LED RGB backlight control, reflected LED color sampler, or fluorescent light color temperature detector. With the addition of an IR blocking filter, the device is an excellent ambient light sensor, color temperature monitor, and general purpose color sensor. The proximity function is targeted specifically towards battery-powered mobile devices, LCD monitor, laptop, and flat-panel television applications . In cell phones, the proximity detection can detect when the user positions the phone close to their ear. The device is fast enough to provide proximity information at a high repetition rate needed when answering a phone call. It can also detect both close and far distances so the application can implement more complex algorithms to provide a more robust interface. In laptop or monitor applications, the product is se nsitive enough to determine whether a user is in front of the laptop using the keyboard or away from the desk. This provides both improved green power saving capability and the added security to lock the computer when the user is not present. Ordering Information and Content Guide appear at end of datasheet. General Description
Page 2 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − General Description Key Benefits & Features The benefits and features of the TCS3771 are listed below: Figure 1: Added Value of using TCS3771
Applications
The applications of TCS3771 include:
- R G B L E D B a c k l i g h t C o n t r o l
- Ambient Color Temperature Sensing
- Cell Phone Touch Screen Disable
- Notebook/Monitor Security
- Automatic Menu Popup
- Industrial Process Control
- Medical Diagnostics Benefits Features Single Device reduces board space RGB Color Sens ing and Proximity Detection in a Single Device Enables both Correlated Color Temperature and Ambient Light Sensing across wide range of lighting condition
- Programmable Analog Gain, Integration Time, and Interrupt Function with Upper and Lower Thresholds
- Resolution Up to 16 bits
- Very High Sensitivity - Ideally Suited for Operation Behind Dark Glass
- Up to 1,000,000:1 Dynamic Range Enables versatile Infra-red proximity based object detection Proximity Detection
- Programmable Number of IR Pulses, Current Sink for the IR LED - No Limiting Resistor Needed, and Interrupt Function with Upper and Lower Thresholds
- Covers a 2000:1 Dynamic Range Low power wait state programmability reduces average power consumption Low Power Wait State
- 65μA Typical Current
- Wait Timer is Programmable from 2.4ms to > 7 seconds Digital interfaces are less susceptible to noise I 2C Interface Compatible
- Up to 400kHz (I 2C Fast Mode) Reduces micro-processor Interrupt Overhead with both up persist and no-persist interrupt thresholds Dedicated Interrupt Pin Enables drop-in and foot-print compatible solutions Pin and Register Set Compatible with the TCS3x7x Family of Devices Reduces board space requirements while simplifying designs Small 2mm × 2.4mm Dual Flat No-Lead Package Low power sleep state reduces average power consumption Sleep Mode - 2.5μA Typical Current
ams Datasheet, Confidential Page 3 [v1-20] 2014-Aug-06 Document Feedback TCS3771 − General Description End Products and Market Segments
- HDTVs, Mobile Handsets, Ta blets, Laptops, Monitors, PMP (Portable Media Payers)
- Medical and Commercial Instrumentation
- Consumer Toys
- Industrial/Commercial Lighting Block Diagram The functional blocks of this device for reference are shown below: Figure 2: TCS3771 Block Diagram
Page 4 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − Detailed Description The TCS3771 light-to-digital device contains a 4 × 4 photodiode array, integrating amplifiers, ADCs, accumulators, clocks, buffers, comparators, a state machine, and an I 2C interface. The 4 × 4 photodiode array is composed of red-filtered, green-filtered, blue-filtered, and clear photodiodes - four of each type. Four integrating ADCs simultaneously convert the amplified photodiode currents to a digital value providing up to 16 bits of resolution. Upon completion of the conversion cycle, the conversion result is transferred to the data registers. The transfers are double-buffered to ensure that the integrity of the data is maintained. Communication to the device is accomplished through a fast (up to 400kHz), two-wire I 2C serial bus for easy connection to a microcontroller or embedded controller. The TCS3771 provides a separate pin for level-style interrupts. When interrupts are enabled and a preset value is exceeded, the interrupt pin is asserted an d remains asserted until cleared by the controlling firmware. The interrupt feature simplifies and improves system efficiency by eliminating the need to poll a sensor for a light intensity or proximity value. An interrupt is generated when the value of an RGBC or proximity conversion exceeds either an upper or lower threshold. In addition, a programmable interrupt persistence feature allows the user to determine how many consecutive exceeded thresholds are necessary to trigger an interrupt. Interrupt thresholds and persistence settings are configured independently for both RGBC and proximity. Proximity detection requires only a single external IR LED. An internal LED driver can be configured to provide a constant current sink of 12.5mA, 25mA, 50mA or 100mA of current. No external current limiting resistor is required. The number of proximity LED pulses can be programmed from 1 to 255 pulses. Each pulse has a 14μs period. This LED current coupled with the programmable number of pulses provides a 2000:1 contiguous dynamic range. Detailed Description
Page 6 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − Absolute Maximum Ratings Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” on page 7 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Figure 5: Absolute Maximum Ratings over Operating Free-Air Temperature Range (unless otherwise noted) Note(s) and/or Footnote(s): 1. All voltages are with respect to GND. Symbol Parameter Min Max Unit VDD Supply voltage (1) 3.8 V VO Digital output voltage range -0.5 3.8 V IO Digital output current -1 20 mA Tstg Storage temperature range -40 85 °C ESD tolerance, human body model 2000 V Absolute Maximum Ratings
Page 8 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − Electrical Characteristics Figure 8: Optical Characteristics, V DD = 3V, TA = 25°C, Gain = 16, ATIME = 0xF6 (unless otherwise noted) (1) Note(s) and/or Footnote(s): 1. The percentage shown represents the rati o of the respective red, green, or blue channel value to the clear channel value. 2. The 465nm input irradiance is supp lied by an InGaN light-emitting diode with the following characteristics: dominant wavelength λ D = 465nm, spectral halfwidth Δλ½ = 22nm, and luminous efficacy = 75lm/W. 3. The 525nm input irradiance is supp lied by an InGaN light-emitting diode with the following characteristics: dominant wavelength λ D = 525nm, spectral halfwidth Δλ½ = 35nm, and luminous efficacy = 520lm/W. 4. The 625nm input irradiance is supp lied by a AlInGaP light-emitting diode with the following characteristics: dominant wavelength λ D = 625nm, spectral halfwidth Δλ½ = 9nm, and luminous efficacy = 155lm/W. Parameter Test Conditions Red Channel Green Channel Blue Channel Clear Channel Unit Min Typ Max Min Typ Max Min Typ Max Min Typ Max Re Irradiance responsivity λD = 465nm, (2) 0% 15% 10% 42% 65% 88% 19.2 24 28.8 counts/ λD = 625nm, (4) 85% 110% 0% 15% 5% 25% 27.2 34 40.8
ams Datasheet, Confidential Page 9 [v1-20] 2014-Aug-06 Document Feedback TCS3771 − Electrical Characteristics Figure 9: RGBC Characteristics, V DD = 3V, TA = 25°C, AGAIN = 16, AEN = 1 (unless otherwise noted) Parameter Test Conditions Min Typ Max Unit Dark ADC count value E e = 0, AGAIN = 60×, ATIME = 0xD6 (100ms) 01 5 c o u n t s ADC integration time step size ATIME = 0xFF 2.27 2.4 2.56 ms ADC number of integration steps 1 256 steps ADC counts per step 0 1024 counts ADC count value ATIME = 0xC0 (153.6ms) 0 65535 counts Gain scaling, relative to 1× gain setting 4× 3.8 4 4.2 %16× 15 16 16.8 60× 58 60 63
ams Datasheet, Confidential Page 11 [v1-20] 2014-Aug-06 Document Feedback TCS3771 − Electrical Characteristics Figure 12: Note(s) and/or Footnote(s): 1. Specified by design and characterization; not production tested. Symbol Parameter (1) Test Conditions Min Typ Max Unit f(SCL) Clock frequency (I2C only) 04 0 0 k H z 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 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 tF Clock/data fall time 300 ns tR Clock/data rise time 300 ns Ci Input pin capacitance 10 pF
Page 12 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − Parameter Measurement Information Figure 13: Timing Diagrams Parameter Measurement Information
ams Datasheet, Confidential Page 15 [v1-20] 2014-Aug-06 Document Feedback TCS3771 − Typical Characteristics Figure 18: Responsivity Temperature Coefficient λ - Wavelength - nm Temperature Coefficient - ppm/°C
Page 16 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − Principles of Operation System State Machine The TCS3771 provides control of RGBC, proximity detection, and power management functionality through an internal state machine ( Figure 19 ). After a power-on-reset, the device is in the sleep mode. As soon as the PON bi t is set, the device will move to the start state. It will then continue through the Prox, Wait, and RGBC states. If these states are enabled, the device will execute each function. If the PON bit is set to 0, the state machine will continue until all conversions are completed and then go into a low power sleep mode. Figure 19: Simplified State Diagram Note(s): In this document, the nomenclature uses the bit field name in italics followed by the register number and bit number to allow the user to easily identify the register and bit that controls the function. For example, the power on (PON) is in register 0, bit 0. This is represented as PON (r0:b0) . Principles of Operation
ams Datasheet, Confidential Page 17 [v1-20] 2014-Aug-06 Document Feedback TCS3771 − Principles of Operation RGBC Operation The RGBC engine contains RGBC gain control (AGAIN) and four integrating analog-to-digital converters (ADC) for the RGBC photodiodes. The RGBC integrat ion time (ATIME) impacts both the resolution and the sensit ivity of the RGBC reading. Integration of all four channels occurs simultaneously and upon completion of the conversion cycl e, the results are transferred t o t h e c o l o r d a t a r e g i s t e r s . T h i s d a t a i s a l s o r e f e r r e d t o a s c h a n n e l count. The transfers are double-b uffered to ensure that invalid data is not read during the transf er. After the transfer, the device automatically moves to the next state in accordance with the configured state machine. Figure 20: RGBC Operation The registers for programming the integration and wait times are a 2’s compliment values. The actual time can be calculated as follows: ATIME = 256 - Integration Time / 2.4ms Inversely, the time can be calculated from the register value as follows: Integration Time = 2.4ms × (256 - ATIME) For example, if a 100-ms integration time is needed, the device needs to be programmed to: 256 - (100 / 2.4) = 256 - 42 = 214 = 0xD6 Conversely, the programmed value of 0xC0 would correspond to: (256 - 0xC0) × 2.4 = 64 × 2.4 = 154ms
ams Datasheet, Confidential Page 19 [v1-20] 2014-Aug-06 Document Feedback TCS3771 − Principles of Operation The LED drive current is controlled by a regulated current sink on the LDR pin. This feature eliminates the need to use a current limiting resistor to control LED current. The LED drive current can be configured for 12.5mA, 25mA, 50mA, or 100mA. For higher LED drive requirements, an external P-FET transistor can be used to control the LED current. The number of LED pulses can be programmed to any value between 1 and 255 pulses as needed. Increasing the number of LED pulses at a given current will increase the sensor sensitivity. Sensitivity grows by the square root of the number of pulses. Each pulse has a 14μs period. Figure 23: Proximity IR LED Waveform The proximity integration time (PTI ME) is the period of time that the internal ADC converts the analog signal to a digital count. It is recommend that this be set to a minimum of PTIME = 0xFF or 2.4ms.
Page 20 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − Principles of Operation The combination of LED power and number of pulses can be used to control the distance at which the sensor can detect proximity. Figure 24 shows an example of the distances covered with settings such that each curve covers 2× the distance. Counts up to 64 pulses provide a 16× range. Figure 24: Proximity ADC Count vs. Relative Distance Interrupts The interrupt feature simplifies and improves system efficiency by eliminating the need to poll the sensor for light intensity or proximity values outside of a user-defined range. While the interrupt function is always enabled and it’s status is available in the status register (0x13), th e output of the interrupt state can be enabled using the proxim ity interrupt enable (PIEN) or RGBC interrupt enable (AIEN) fields in the Enable Register (0x00). Four 16-bit interrupt threshold registers allow the user to set limits below and above a desired light level and proximity range. An interrupt can be generated when the RGBC Clear data (CDATA) falls outside of the desired light level range, as determined by the values in the RGBC interrupt low threshold registers (AILTx) and RGBC inte rrupt high threshold registers (AIHTx). Likewise, an out-of-ran ge proximity interrupt can be generated when the proximity data (PDATA) falls below the
ams Datasheet, Confidential Page 21 [v1-20] 2014-Aug-06 Document Feedback TCS3771 − Principles of Operation proximity interrupt low threshold (PILTx) or exceeds the proximity interrupt high threshold (PIHTx). It is important to note that the low threshold valu e must be less than the high threshold value for proper operation. To further control when an interrupt occurs, the device provides a persistence filter. The persiste nce filter allows the user to specify the number of consec utive out-of-range RGBC or proximity occurrences before an interrupt is generated. The persistence register (0x0C) allows the user to set the RGBC persistence (APERS) and the pr oximity persistence (PPERS) values. See the persistence register for details on the persistence filter values. Once the persistence filter generates an interrupt, it will continue un til a special function interrupt clear command is received (see “Command Register” on page 26 ). Figure 25: Programmable Interrupt
ams Datasheet, Confidential Page 23 [v1-20] 2014-Aug-06 Document Feedback TCS3771 − Principles of Operation I2C Protocol Interface and control are accomplished through an I 2C serial compatible interface (standard or fast mode) to a set of registers that provide access to device cont rol functions and output data. The devices support the 7-bit I 2C addressing protocol. The I 2C standard provides for three types of bus transaction: read, write, and a combined protocol ( Figure 27 ). During a write operation, the first byte written is a command byte followed by data. In a combined protocol, the first byte written is the command byte followed by reading a series of bytes. If a read command is issued, the register address from the previous command will be used for data access. Likewise, if the MSB of the command is not set, the device will write a series of bytes at the address stored in the last valid command with a register address. The command byte contains either control information or a 5-bit register address. The control commands can also be used to clear interrupts. The I 2C bus protocol was developed by Philips (now NXP). For a complete description of the I 2C protocol, please review the NXP I 2C design specification at http://www.i2c-bus.org/references . Figure 27: I2C Protocols … Continuation of protocol W Write (0) Sr Repeated Start Condition S Start Condition N Not Acknowledged (1) A Acknowledge (0) Master-to-Slave Slave-to-Master R Read (1) P Stop Condition S Slave Address W A Command Code R A 11 1 1 178 I2C Read Protocol - Combined Format A Slave Address Sr A Data AData P ... S Slave Address R A Data A P 11 1 1 178 I2C Read Protocol ...A Data WS Slave Address A Command Code A P 11 1 1 178 I2C Write Protocol ...A Data Byte
Page 24 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − Principles of Operation Register Set The TCS3771 is controlled and mo nitored by data registers and a command register accessed th rough 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 28 . Figure 28: Register Address Address Register Name R/W Register Function Reset Value -- COMMAND W Specifies register address 0x00 0x00 ENABLE R/W Enables states and interrupts 0x00 0x01 ATIME R/W RGBC ADC time 0xFF 0x02 PTIME R/W Proximity ADC time 0xFF 0x03 WTIME R/W Wait time 0xFF 0x04 AILTL R/W RGBC interrupt low threshold low byte 0x00 0x05 AILTH R/W RGBC interrupt low threshold high byte 0x00 0x06 AIHTL R/W RGBC interrupt high threshold low byte 0x00 0x07 AIHTH R/W RGBC interrupt hi gh threshold high byte 0x00 0x08 PILTL R/W Proximity interrupt low threshold low byte 0x00 0x09 PILTH R/W Proximity interrupt low threshold high byte 0x00 0x0A PIHTL R/W Proximity interrupt high threshold low byte 0x00 0x0B PIHTH R/W Proximity interrupt high threshold high byte 0x00 0x0C PERS R/W Interrupt persistence filters 0x00 0x0D CONFIG R/W Configuration 0x00 0x0E PPCOUNT R/W Proximity pulse count 0x00 0x0F CONTROL R/W Gain control register 0x00 0x12 ID R Device ID ID 0x13 STATUS R Device status 0x00 0x14 CDATA R Clear ADC low data register 0x00 0x15 CDATAH R Clear ADC high data register 0x00 0x16 RDATA R Red ADC low data register 0x00 0x17 RDATAH R Red ADC high data register 0x00 0x18 GDATA R Green ADC low data register 0x00
ams Datasheet, Confidential Page 25 [v1-20] 2014-Aug-06 Document Feedback TCS3771 − Principles of Operation The mechanics of accessing a spec ific register depends on the specific protocol used. See the section on I 2C protocols on the previous pages. In general, the Command register is written first to specify the specific control/ status register for following read/write operations. 0x19 GDATAH R Green ADC high data register 0x00 0x1A BDATA R Blue ADC low data register 0x00 0x1B BDATAH R Blue ADC high data register 0x00 0x1C PDATA R Proximity ADC low data register 0x00 0x1D PDATAH R Proximity ADC high data register 0x00 Address Register Name R/W Register Function Reset Value
Page 26 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − Principles of Operation Command Register The Command Registers specifie s the address of the target register for future write and read operations. Figure 29: Command Register 76 5 43210 COMMAND TYPE ADD Field Bits Description COMMAND 7 Select Command Register. Must write as 1 when addressing Command Register. TYPE 6:5 Selects type of transaction to follow in subsequent data transfers: Field Value Integration Time
00 Repeated byte protocol transaction
01 Auto-increment protocol transaction
10 Reserved - Do not use
11 Special function - See description below
Byte protocol will repeatedly read the same register with each data access. Block protocol will provide auto-increment function to read successive bytes. ADD 4:0 Address field/special function field. Depending on the transaction type, see above, this field either specifies a special function command or selects the specific control-status-register for following write and read transactions. The field values listed below apply only to special function commands: Field Value Read Value
00000 Normal - no action
00101 Proximity interrupt clear
00110 RGBC interrupt clear
00111 Proximity and RGBC interrupt clear
other Reserved — Do not write RGBC/Proximity Interrupt Clear. Clears any pending RGBC/Proximity interrupt. This special function is self clearing.
ams Datasheet, Confidential Page 27 [v1-20] 2014-Aug-06 Document Feedback TCS3771 − Principles of Operation Enable Register (0x00) The Enable Register is used primarily to power the TCS3771 device on and off, and enable fu nctions and interrupts as shown in Figure 30 . Figure 30: Enable Register Note(s) and/or Footnote(s): 1. A minimum interval of 2.4ms must pass after PON is asserted be fore either a proximity or an RGBC can be initiated. This requ ired time is enforced by the hardware in case s where the firmware does not provide it. 7 6 543210 Reserved PIEN AIEN WEN PEN AEN PON Field Bits Description Reserved 7:6 Reserved. Write as 0. PIEN 5 Proximity interrupt enable. When asserted, permits proximity interrupts to be generated. AIEN 4 RGBC interrupt enable. When asserted, permits RGBC interrupts to be generated. WEN 3 Wait enable. This bit activates the wait feature. Writing a 1 activates the wait timer. Writing a 0 disables the wait timer. PEN 2 Proximity enable. This bit activates the proximity function. Writing a 1 enables proximity. Writing a 0 disables proximity. AEN 1 RGBC enable. This bit actives the two-channel ADC. Writing a 1 activates the RGBC. Writing a 0 disables the RGBC. PON (1) 0 Power ON. This bit activates the internal oscillator to permit the timers and ADC channels to operate. Writing a 1 activates the oscillator. Writing a 0 disables the oscillator. During reads and writes over the I2C interface, this bit is temporarily overridden and the oscillator is enabled, independent of the state of PON.
Page 30 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − Principles of Operation Proximity Interrupt Threshold Registers (0x08 − 0x0B) The Proximity Interrupt Threshold Registers provide the values to be used as the high and low trigger points for the comparison function for interrupt generati on. If the value generated by proximity channel crosses below the lower threshold specified, or above the higher threshold, an interrupt is signaled to the host processor. Figure 35: Proximity Interrupt Threshold Register Register Address Bits Description PILTL 0x08 7:0 Proximity ADC channel low threshold lower byte PILTH 0x09 7:0 Proximity ADC channel low threshold upper byte PIHTL 0x0A 7:0 Proximity ADC channel high threshold lower byte PIHTH 0x0B 7:0 Proximity ADC channel high threshold upper byte
ams Datasheet, Confidential Page 31 [v1-20] 2014-Aug-06 Document Feedback TCS3771 − Principles of Operation Persistence Register (0x0C) The Persistence Register controls the filtering interrupt capabilities of the device. Configurable filtering is provided to allow interrupts to be generated after each integration cycle or if the integration has produced a result that is outside of the values specified by the threshol d register for some specified amount of time. Separate filtering is provided for proximity and the RGBC clear channel. Figure 36: Persistence Register 7 6 543210 PPERS APERS Field Bits Description PPERS 7:4 Proximity interrupt persistence. Controls rate of proximity interrupt to the host processor. Field Value Meaning Interrupt Persistence Function 0000 ---- Every proximity cycl e generates an interrupt 0001 1 1 proximity value out of range 0010 2 2 consecutive proximity values out of range 1111 15 15 consecutive proximity values out of range
Page 32 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − Principles of Operation APERS 3:0 Interrupt persistence. Controls rate of interrupt to the host processor. Field Value Meaning Interrupt Persistence Function
0000 Every Every RGBC cycle generates an interrupt
0001 1 1 clear channel value outside of threshold range 0010 2 2 clear channel consecutive values out of range 0011 3 3 clear channel consecutive values out of range 0100 5 5 clear channel consecutive values out of range 0101 10 10 clear channel consecutive values out of range 0110 15 15 clear channel consecutive values out of range 0111 20 20 clear channel consecutive values out of range 1000 25 25 clear channel consecutive values out of range 1001 30 30 clear channel consecutive values out of range 1010 35 35 clear channel consecutive values out of range 1011 40 40 clear channel consecutive values out of range 1100 45 45 clear channel consecutive values out of range 1101 50 50 clear channel consecutive values out of range 1110 55 55 clear channel consecutive values out of range 1111 60 60 clear channel consecutive values out of range Field Bits Description
Page 34 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − Principles of Operation Control Register (0x0F) The Control Register provides eight bits of miscellaneous control to the analog block. These bits typically control functions such as gain setti ngs and/or diode selection. Figure 39: Control Register 76 5 43210 PDRIVE PDIODE Reserved AGAIN Field Bits Description PDRIVE 7:6 LED Drive Strength. Field Value LED Strength 00 100mA 01 50mA 10 25mA 11 12.5mA PDIODE 5:4 Proximity Diode Select. Field Value Diode Selection
00 Reserved
01 Proximity uses the clear (broadband) diode
10 Proximity uses the IR diode
11 Proximity uses both the clear diode and the red diode
Reserved 3:2 Reserved. Write bits as 0. AGAIN 1:0 RGBC Gain Control. Field Value RGBC Gain Value 00 1× gain 01 4× gain 10 16× gain 11 60× gain
Page 38 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − Application Information VBUS in the above figures refers to the I 2C bus voltage which is either V DD or 1.8V. Be sure to apply the specified I 2C bus voltage shown in the Available Options table for the specific device being used. The I 2C signals and the Interrupt are open-drain outputs and require pull−up resistors. The pull-up resistor (RP) value is a function of the I 2C bus speed, the I 2C bus voltage, and the capacitive load. The ams EVM running at 400kbps, uses 1.5kΩ resistors. A 10kΩ pull-up resist or (RPI) can be used for the interrupt line. PCB Pad Layout Suggested PCB pad layout guidelines for the Dual Flat No-Lead (FN) surface mount package are shown in Figure 46 . Figure 46: Suggested FN Package PCB Layout Note(s) and/or Footnote(s): 1. All linear dimensions are in millimeters. 2. This drawing is subject to change without notice. 3. Pads can be extended further if hand soldering is needed.
ams Datasheet, Confidential Page 39 [v1-20] 2014-Aug-06 Document Feedback TCS3771 − Packaging Mechanical Data Figure 47: Package FN - Dual Flat No-Lead Packaging Configuration Note(s) and/or Footnote(s): 1. All linear dimensions are in micrometers. 2. The die is centered within the package within a tolerance of ±75μm. 3. Package top surface is molded with an electrically nonconduct ive clear plastic compound having an index of refraction of 1.5 5. 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. Packaging Mechanical Data
Page 40 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − Packaging Mechanical Data Figure 48: Package FN Carrier Tape Note(s) and/or Footnote(s): 1. All linear dimensions are in millimeters. Di mension tolerance is ±0.10mm unless otherwise noted. 2. The dimensions on this drawing are for illustrative purpos es only. Dimensions of an actual carrier may vary slightly. 3. Symbols on drawing A o, Bo, and K o 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.
Page 42 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − 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 previous ly absorbed into the package. To ensure the package 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 called a moisture barrier bag with silica gel to protect them from ambient moisture during shipping, handling, and storage before use. 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: 5°C to 50°C
- Relative Humidity: 60% maximum
- Total Time: 12 months from the date code on the aluminized envelo pe - if unopened
- Opened Time: 168 hours or fewer Rebaking will be required if the devices have been stored unopened for more than 12 months or if the aluminized envelope has been open for more than 168 hours. If rebaking is required, it should be done at 50°C for 12 hours.
ams Datasheet, Confidential Page 43 [v1-20] 2014-Aug-06 Document Feedback TCS3771 − Ordering & Contact Information Figure 51:
Ordering Information
Note(s) and/or Footnote(s): 1. Contact ams for availability. 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 Unterpremstaetten
Austria, Europe Tel: +43 (0) 3136 500 0 Website: www.ams.com Device Address Package - Leads Interface Description Ordering Number TCS37711 (1) 0x39 FN-6 I2C Vbus = VDD Interface TCS37711FN TCS37713 (1) 0x39 FN-6 I2C Vbus = 1.8V Interface TCS37713FN TCS37715 0x29 FN-6 I2C Vbus = VDD Interface TCS37715FN TCS37717 0x29 FN-6 I2C Vbus = 1.8V Interface TCS37717FN Ordering & Contact Information
Page 44 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − 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 specif ied 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 unde rway to better integrate information from third parties. ams AG has taken and continues to take reasonable steps to prov ide 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
ams Datasheet, Confidential Page 45 [v1-20] 2014-Aug-06 Document Feedback TCS3771 − Copyrights & Disclaimer Copyright ams AG, Tobelbader Strasse 30, 8141 Unterpremstaetten, 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 appe aring in its General Terms of Trade. ams AG makes no warranty, express, statutory, implied, or by description regarding th e information set forth herein. ams AG reserves the right to ch ange 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 wa rranties, 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 th ird party shall arise or flow out of ams AG rendering of technical or other services. Copyrights & Disclaimer
Page 46 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − 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
ams Datasheet, Confidential Page 47 [v1-20] 2014-Aug-06 Document Feedback TCS3771 − Revision Information Note(s) and/or Footnote(s): 1. Page numbers for the previous version may diff er from page numbers in the current revision. Changes from 1-10 (2014-Jun-20) to current revision 1-20 (2014-Aug-06) Page(1) Updated Figure 1 2 Updated Figure 51 43 Revision Information
Page 48 ams Datasheet, Confidential Document Feedback [v1-20] 2014-Aug-06 TCS3771 − Content Guide
1 General Description
2 Key Benefits & Features
2 Applications
3 End Products and Market Segments
3 Block Diagram
4 Detailed Description
5 Pin Assignments
6A b s o l u t e M a x i m u m R a t i n g s