LTR-381RGB-WA

Optical Sensor Product Data Sheet LTR-381RGB-WA Spec No. :DS86-2017-0037 Effective Date: 03/03/2018 Revision: - LITE-ON DCC RELEASE BNS-OD-FC001/A4 LITE-ON Technology Corp. / Optoelectronics No.90,Chien 1 Road, Chung Ho, New Taipei City 23585, Taiwan, R.O.C. Tel: 886-2-2222-6181 Fax: 886-2-2221-1948 / 886-2-2221-0660 http://www.liteon.com/opto OPTICAL SENSOR LTR-381RGB-WA Features Description The LTR-381RGB-WA is an integrated low voltage I2C ambient light sensor (ALS) and a color sensor (CS) in a single 2x2mm miniature ChipLED lead-free surface mount • I2C interface (Standard mode @100kHz or Fast mode @400kHz) • Ambient Light / Advanced RGB in ultra-small chipled package package. • With the advanced RGB color sensor, this sensor converts light (Red, Green, Blue, and IR) intensity to a digital output signal capable of direct I2C interface. The ALS provides a linear response over a wide dynamic range, which is well suited to applications under very low or bright ambient Very low power consumption with sleep mode capability • Operating voltage ranges: 1.7V to 3.6V • Operating temperature ranges: -40 to +85 ºC • Built-in temperature compensation circuit • Programmable interrupt function for ALS with upper • RoHS and Halogen free compliant • RGB/ALS Features and lower thresholds brightness. The sensor has a programmable interrupt with hysteresis to response to events and that removes the need to poll the sensor for a reading which improves system efficiency.
16 to 20 bits effective resolution This CMOS design and factory-set one time trimming
Wide dynamic range with linear response capability ensure minimal sensor-to-sensor variations for
Close to human eye spectral response ease of manufacturability to the end customers.
Automatic rejection for 50Hz/60Hz lighting flicker Application Control brightness and color of display panel in mobile, computing, and consumer devices. Ordering Information Part Number Packaging Type Package Quantity LTR-381RGB-WA Tape and Reel 6-pin chipled package 2500 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 Confidential 1/34 OPTICAL SENSOR LTR-381RGB-WA 1. Outline Dimensions Confidential 2/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA 2. Functional Block Diagram LTR-381RGB-WA contains different photodiodes for ALS/CS (red, green, blue, and IR channel) measurement. The photodiode currents are converted to digital values by ADCs. The sensor also includes some peripheral circuits such as an internal oscillator, a current source, voltage reference, and internal fuses to store trimming information. Confidential 3/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA 3. Application Circuit I/O Pins Configuration Table Pin 1 I/O Type Symbol Description Supply VDD Power Supply Voltage NC Reserved for internal test. Do not connect at application circuit level. 2 3 Ground GND Ground 4 I SCL* I2C serial clock. This pin is an open drain input. 5 O INT* Level Interrupt Pin. This pin is an open drain output. 6 I/O SDA* I2C serial data. This pin is an open drain input / output. * Note: For noisy environment, add 10pF capacitor from signal to GND for additional noise filtering. Recommended Application Circuit Components Component Recommended Value Rp1, Rp2, Rp3 [1] 1 kΩ to 10 kΩ C1 0.1uF C2 1uF Notes: [1] Selection of pull-up resistors value is dependent on bus capacitance values. For more details, please refer to I2C Specifications: http://www.nxp.com/documents/user_manual/UM10204.pdf Confidential 4/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA 4. Rating and Specification 4.1. Absolute Maximum Rating at Ta=25°C Parameter Symbol Min. Supply Voltage VDD Digital Voltage Range SCL, SDA, INT Storage Temperature Tstg Electrostatic Discharge Protection Note 1 (Human Body Model JESD22-A114) VHBM Max. Unit 3.63 V -0.5 3.63 V -40 95 °C 2000 V Note: 1. ESD VHMB for pin 2 (NC) is 1000V. This pin is reserved for internal test, do not connect at application circuit level. 2. Exceeding these ratings could cause damage to the sensor. All voltages are with respect to ground. Currents are positive into, negative out of the specified terminal. 4.2. Recommended Operating Conditions Description Symbol Min. VDD Interface signal input high Interface signal input low Supply Voltage Operating Temperature Typ. Max. Unit 1.7 3.6 V VI2Chigh 1.5 VDD V VI2Clow 0 0.4 V Tope -40 85 °C 4.3. Electrical Specifications (VDD = 3.0V, Ta=25°C , unless otherwise noted) Parameter Min. Typ. Max. Unit Condition ALS Active Supply Current 120 uA Default duty cycle, VDD=3.0V, Gain 3x CS Active Supply Current 120 uA Default duty cycle, VDD=3.0V Standby Current 1.2 uA Standby Mode Wakeup Time from Standby 0.5 ms From Standby to Active mode where measurement can start Confidential 10 5/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA 4.4. Characteristics Ambient Light/Color Sensor (VDD = 3.0V, Ta=25°C, unless otherwise noted) Parameter Min. ALS/CS Resolution Typ. 16 Dark Level Count 0 Lux Accuracy -10 Max. Unit Condition 20 Bit 5 Count +10 % Direct illumination Based on XYZ coordinate, no window. Programmable for 16, 17, 18, 19, 20 Bit 0 Lux, 18-bit resolution Color temperature Accuracy -5 +5 % 50/60 Hz flicker noise error -5 +5 % Temperature Dependency -0.25 +0.25 %/°C Voltage Dependency -5 +5 % At 100 Lux, At operating voltage ranges Integration time 25 400 ms With 50/60Hz Rejection At 100 Lux 4.5. Typical Device Parameter (VDD = 3.0V, Ta=25°C, Default power-up settings, unless otherwise noted) RGB Spectral Response Spectral Response of RGB Confidential Angular of Incidence ALS Sensitivity vs. Angular of Incidence 6/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA 4.8. AC Electrical Characteristics All specifications are at VBus = 1.7V, Tope = 25°C, unless otherwise noted. Symbol Parameter f SCL SCL clock frequency Min. 1 Max. Unit 400 kHz Bus free time between a STOP and START condition t BUF 1.3 us Hold time (repeated) START condition. After this period, the first clock pulse is generated t HD ; STA 0.6 us LOW period of the SCL clock t LOW 1.3 us HIGH period of the SCL clock t HIGH 0.6 us Set-up time for a repeated START condition t SU ;STA 0.6 us Set-up time for STOP condition t SU ; STO 0.6 us Rise time of both SDA and SCL signals tr 30 300 ns Fall time of both SDA and SCL signals tf 30 300 ns Data hold time t HD ; DAT 0.3 0.9 us Data setup time t SU ; DAT 100 Pulse width of spikes which must be suppressed by the input filter t SP 0 ns 50 ns Definition of timing for I2C bus Confidential 7/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA 5. Principle of Operation I2C Protocols ．I2C Write Protocol (type 1): ．I2C Write Protocol (type 2): ．I2C Read Protocol: Confidential 8/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA ．I2C Read (Combined format) Protocol: A S P W Acknowledge (0 for an ACK) Start condition Stop condition Write (0 for writing) Slave-to-master N Sr Non-Acknowledge(1 for an NACK) Repeated Start condition R Read (1 for read) Master-to-Slave I2C Slave Address The device has a 7-bit slave address of 0x53. A read/write bit should be appended to the slave address by the master device to properly communicate with the device. I2C Slave Address (Default) (0x53) W/R Command Type Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Write 1 0 1 0 0 1 1 0 0xA6H Read 1 0 1 0 0 1 1 1 0xA7H Confidential value 9/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA 6. Register Set Addr R/W 0x00 RW 0x01~0x03 R 0x04 R/W 0x05 R/W 0x06 R Register Name Reset Value Description MAIN_CTRL Operation mode control, SW reset Reserved -- 0x00 ALS_CS_MEAS_RATE ALS/CS measurement rate and resolution in Active Mode -0x22 ALS_CS_GAIN ALS/CS analog Gain 0x01 PART_ID Part number ID and revision ID 0xC2 0x20 0x07 R MAIN_STATUS Power-On status, Interrupt status, Data status 0x08~0x09 R Reserved -- 0x0A R CS_DATA_IR_0 CS IR ADC measurement data,LSB 0x00 0x00 -- 0x0B R CS_DATA_IR_1 CS IR ADC measurement data 0x0C R CS_DATA_IR_2 CS IR ADC measurement data, MSB 0x00 0x0D R CS_DATA_GREEN_0 CS green / ALS ADC measurement data, LSB 0x00 0x0E R CS_DATA_GREEN_1 CS green / ALS ADC measurement data 0x00 0x0F R CS_DATA_GREEN_2 CS green / ALS ADC measurement data, MSB 0x00 0x10 R CS_DATA_BLUE_0 CS blue ADC measurement data, LSB 0x00 0x11 R CS_DATA_BLUE_1 CS blue ADC measurement data 0x00 0x12 R CS_DATA_BLUE_2 CS blue ADC measurement data, MSB 0x00 0x13 R CS_DATA_RED_0 CS red ADC measurement data, LSB 0x00 0x14 R CS_DATA_RED_1 CS red ADC measurement data 0x00 0x00 0x15 R CS_DATA_RED_2 CS red ADC measurement data, MSB 0x16~0x18 R Reserved -- 0x19 R/W INT_CFG Interrupt configuration 0x10 0x00 -- 0x1A R/W INT_PST Interrupt persist setting 0x1B~0x20 R Reserved -- 0x21 R/W ALS_THRES_UP_0 ALS interrupt upper threshold, LSB 0xFF 0x22 R/W ALS_THRES_UP_1 ALS interrupt upper threshold, intervening bits 0xFF 0x23 R/W ALS_THRES_UP_2 ALS interrupt upper threshold, MSB 0x0F 0x24 R/W ALS_THRES_LOW_0 ALS interrupt lower threshold, LSB 0x00 0x25 R/W ALS_THRES_LOW_1 ALS interrupt lower threshold, intervening bits 0x00 0x26 R/W ALS_THRES_LOW_2 ALS interrupt lower threshold, MSB 0x00 Confidential -- 10/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA MAIN_CTRL Register (0x00) (Read/Write) This register controls the operation modes of CS/ALS, which can be set to either standby or active mode. When writing to this register, it will cause a stop to any ongoing measurements (CS/ALS) and start new measurement. 0x00 MAIN_CTRL (default = 0x00) B7 B6 B5 Reserved Field Bits Default Reserved 7:5 000 SW Reset 4 0 Reserved 3 0 CS Mode 2 0 ALS/CS Enable 1 0 Reserved 0 0 Confidential B4 B3 B2 B1 B0 SW Reset Reserved CS Mode ALS CS Enable Reserved Description -- Must write 000 0 Software reset is NOT triggered (default) 1 Software reset is triggered -0 Must write 0 ALS mode: ALS, IR and Temperature Compensation Channels activated (default) 1 CS mode: All Light Sensor channels activated (RGB+IR+COMP) 0 ALS standby (default) 1 ALS active -- Must write 0 11/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA ALS_CS_MEAS_RATE Register (0x04) (Read/Write) This register controls ALS/CS measurement resolution, Gain setting and measurement rate. When the measurement rate is programmed to be faster than possible for the programmed ADC measurement, the rate will be lowered than programmed (maximum speed). 0x04 ALS_CS_MEAS_RATE (default = 0x22) B7 B6 Reserved B5 B4 ALS/CS Resolution/Bit Width Field Bits Default Description Reserved 7 0 Must write 0 ALS/CS Resolution 6:4 010 ALS/CS Measurement Rate Confidential 3 2:0 0 010 B2 Reserved B1 B0 ALS/CS Measurement Rate 000 20 Bit, Conversion time = 400ms 001 010 011 100 19 Bit, Conversion time = 200ms 18 Bit, Conversion time = 100ms(default) 17 Bit, Conversion time = 50ms 16 Bit, Conversion time = 25ms 101/110/111 Reserved B3 Reserved Must write 0 000 001 010 011 100 101 110/111 25ms 50ms 100ms (default) 200ms 500ms 1000ms 2000ms 12/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA ALS_CS_GAIN Register (0x05) (Read/Write) This register controls ALS/CS measurement Gain Range. 0x05 ALS_CS_GAIN (default = 0x01) B7 B6 B5 B4 B3 B2 Reserved Field Bits Default Reserved 7:3 00000 ALS/CS Gain Range 2:0 B1 B0 ALS/CS Gain Range Description Must write 00000 001 000 Gain Range: 1 001 Gain Range: 3 (default) 010 Gain Range: 6 011 Gain Range: 9 100 Gain Range: 18 PART_ID Register (0x06) (Read Only) This register defines the part number and revision identification of the sensor. 0x06 PART_ID (default = 0xC2) B7 B6 B5 B4 Part Number ID Field Bits Default Part Number ID 7:4 1100 Part Number ID Reserved 3:0 0010 -- Confidential B3 B2 B1 B0 Reserved Description 13/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA MAIN_STATUS Register (0x07) (Read Only) This register stores the information about the ALS/CS interrupts and data status. The interrupt status in Bit 4 determines if the ALS/CS interrupt criteria are met in Normal Interrupt Mode: It triggers when the CS/ALS is above the upper or below the lower threshold for a specified number of consecutive measurements in respective interrupt persist settings. For details interrupt behavior, refer to Section 10. 0x07 MAIN_STATUS (default = 0x00) B7 B6 Reserved B5 B4 B3 Power ON Status ALS/CS Interrupt Status ALS/CS Data Status Field Bits Default Reserved 7:6 00 5 1 1 ALS/CS Interrupt Status CS/ALS Data Status Reserved Confidential 4 3 2:0 0 B1 B0 Reserved Description 0 Power On Status B2 Normal Part went through a power-up event, either because the part was turned on or because there was a power supply voltage disturbance. 0 A value of 1 is the default for the first register read after power-on-reset. The flag is cleared after the flag is read. Interrupt is NOT triggered (default) 1 Interrupt is triggered and will be cleared after read 0 CS/ALS data is old data (Data has been read) 1 CS/ALS data is new data (Data has not been read and will be cleared after read) 0 000 14/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA CS_DATA_IR Register (0x0A / 0x0B / 0x0C) (Read Only) The Color Sensor IR Channel digital output data are expressed as a 16 to 20 bit unsigned integer data. When I2C read operation is active and points to any of the register address between 0x07 and 0x18, all 3 registers will be locked until the I2C read operation has been completed or the specified address range is left. This is to ensure that the data in the registers is from the same measurement even if an additional measurement cycle ends during the read operation. New measurement data is stored into temporary registers and the CS_DATA_IR registers will be updated as soon as there is no on-going I2C read operation to the address range 0x07 to 0x18. 0x0A CS_DATA_IR_0 (default = 0x00) B7 B6 B5 B4 B3 B2 B1 B0 B2 B1 B0 B2 B1 B0 CS DATA IR, Low 0x0B CS_DATA_IR_1 (default = 0x00) B7 B6 B5 B4 B3 CS DATA IR, Middle 0x0C CS_DATA_IR_2 (default = 0x00) B7 B6 B5 B4 B3 Reserved CS DATA IR, High Field Address Bits Default CS Data IR, Low 0x0A 7:0 0000 0000 CS Data (IR) lower byte data CS Data IR, Middle 0x0B 7:0 0000 0000 CS Data (IR) Middle byte data 7:4 0000 Reserved CS Data IR, High 0x0C 3:0 0000 CS Data (IR) Higher byte data Confidential Description 15/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA CS_DATA_GREEN Register (0x0D / 0x0E / 0x0F) (Read Only) The Color Sensor Green Channel digital output data are expressed as a 16 to 20 bit unsigned integer data. When I2C read operation is active and points to any of the register address between 0x07 and 0x18, all 3 registers will be locked until the I2C read operation has been completed or the specified address range is left. This is to ensure that the data in the registers is from the same measurement even if an additional measurement cycle ends during the read operation. New measurement data is stored into temporary registers and the CS_DATA_GREEN registers will be updated as soon as there is no on-going I2C read operation to the address range 0x07 to 0x18. 0x0D CS_DATA_GREEN_0 (default = 0x00) B7 B6 B5 B4 B3 B2 B1 B0 B1 B0 B1 B0 CS DATA GREEN, Low 0x0E CS_DATA_GREEN_1 (default = 0x00) B7 B6 B5 B4 B3 B2 CS DATA GREEN, Middle 0x0F CS_DATA_GREEN_2 (default = 0x00) B7 B6 B5 B4 Reserved B3 B2 CS DATA GREEN, High Field Address Bits Default CS Data Green, Low 0x0D 7:0 0000 0000 CS Data (Green) lower byte data CS Data Green, Middle 0x0E 7:0 0000 0000 CS Data (Green) Middle byte data 7:4 0000 Reserved CS Data Green, High 0x0F 3:0 0000 CS Data (Green) Higher byte data Confidential Description 16/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA CS_DATA_BLUE Register (0x10 / 0x11 / 0x12) (Read Only) The Color Sensor Blue Channel digital output data are expressed as a 16 to 20 bit unsigned integer data. When I2C read operation is active and points to any of the register address between 0x07 and 0x18, all 3 registers will be locked until the I2C read operation has been completed or the specified address range is left. This is to ensure that the data in the registers is from the same measurement even if an additional measurement cycle ends during the read operation. New measurement data is stored into temporary registers and the CS_DATA_BLUE registers will be updated as soon as there is no on-going I2C read operation to the address range 0x07 to 0x18. 0x10 CS_DATA_BLUE_0 (default = 0x00) B7 B6 B5 B4 B3 B2 B1 B0 B1 B0 B1 B0 CS DATA BLUE, Low 0x11 CS_DATA_BLUE_1 (default = 0x00) B7 B6 B5 B4 B3 B2 CS DATA BLUE, Middle 0x12 CS_DATA_BLUE_2 (default = 0x00) B7 B6 B5 B4 B3 Reserved B2 CS DATA BLUE, High Field Address Bits Default CS Data Blue, Low 0x10 7:0 0000 0000 CS Data (Blue) lower byte data CS Data Blue, Middle 0x11 7:0 0000 0000 CS Data (Blue) Middle byte data 7:4 0000 Reserved CS Data Blue, High 0x12 3:0 0000 CS Data (Blue) Higher byte data Confidential Description 17/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA CS_DATA_RED Register (0x13 / 0x14 / 0x15) (Read Only) The Color Sensor Red Channel digital output data are expressed as a 16 to 20 bit unsigned integer data. When I2C read operation is active and points to any of the register address between 0x07 and 0x18, all 3 registers will be locked until the I2C read operation has been completed or the specified address range is left. This is to ensure that the data in the registers is from the same measurement even if an additional measurement cycle ends during the read operation. New measurement data is stored into temporary registers and the CS_DATA_RED registers will be updated as soon as there is no on-going I2C read operation to the address range 0x07 to 0x18. 0x13 CS_DATA_RED_0 (default = 0x00) B7 B6 B5 B4 B3 B2 B1 B0 B1 B0 B1 B0 CS DATA RED, Low 0x14 CS_DATA_RED_1 (default = 0x00) B7 B6 B5 B4 B3 B2 CS DATA RED, Middle 0x15 CS_DATA_RED_2 (default = 0x00) B7 B6 B5 B4 Reserved B3 B2 CS DATA RED, High Field Address Bits Default CS Data Red, Low 0x13 7:0 0000 0000 CS Data (Red) lower byte data CS Data Red, Middle 0x14 7:0 0000 0000 CS Data (Red) Middle byte data 7:4 0000 Reserved CS Data Red, High 0x15 3:0 0000 CS Data (Red) Higher byte data Confidential Description 18/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA INT_CFG Register (0x19) (Read/Write) This register controls the operation of the interrupt pin and functions. CS/ALS has independent interrupt signal and CS/ALS interrupt is active low. CS/ALS interrupt is enabled by Bit 2. 0x19 INT_CFG (default = 0x10) B7 B6 B5 Reserved B4 ALS INT SELECT B3 B2 Reserve d ALS INT PIN ENABLE Field Bits Default Description Reserved 7:6 00 Must write 00 ALS Interrupt Select 4:5 01 Reserved 3 0 ALS Interrupt Pin Enable 2 0 Reserved 1:0 Confidential 00 00 01 10 11 B1 B0 Reserved IR Channel ALS/Green Channel(default) Red Channel Blue Channel Must write 0 0 ALS interrupt disabled (default) 1 ALS interrupt enabled Must write 00 19/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA INT_PST Register (0x1A) (Read/Write) This register controls the N number of times the measurement data is outside the range defined by the upper and lower threshold limits before asserting the interrupt. 0x1A INT_PST (default = 0x00) B7 B6 B5 B4 ALS/CS Persist Field ALS/CS Persist Reserved Confidential Bits 7:4 3:0 0000 B2 B1 B0 Reserved Default 0000 B3 Description 0000 Every ALS value out of threshold range asserts an interrupt (default) 0001 2 consecutive ALS values out of threshold range assert an interrupt … … 1111 16 consecutive ALS values out of threshold range assert an interrupt 0000 Must write 0000 20/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA ALS_THRES Register (0x21 / 0x22 / 0x23 / 0x24 / 0x25 / 0x26) (Read/Write) The ALS_THRES_UP (up to 20-bits) and ALS_THRES_LOW (up to 20-bits) registers determines the upper and lower limit of the interrupt threshold value respectively. Interrupt will be triggered if measurement data in CS_DATA_GREEN registers is exceeding the upper and lower limits. 0x21 ALS_THRES_UP_0 (default = 0xFF) B7 B6 B5 B4 B3 B2 B1 B0 B1 B0 B1 B0 ALS Upper Threshold, Low 0x22 ALS_THRES_UP_1 (default = 0xFF) B7 B6 B5 B4 B3 B2 ALS Upper Threshold, Mid 0x23 ALS_THRES_UP_2 (default = 0x0F) B7 B6 B5 B4 B3 Reserved 0x24 B2 ALS Upper Threshold, High ALS_THRES_LOW_0 (default = 0x00) B7 B6 B5 B4 B3 B2 B1 B0 B1 B0 B1 B0 ALS Lower Threshold, Low 0x25 ALS_THRES_LOW_1 (default = 0x00) B7 B6 B5 B4 B3 B2 ALS Lower Threshold, Mid 0x26 ALS_THRES_LOW_2 (default = 0x00) B7 B6 B5 B4 B3 Reserved B2 ALS Lower Threshold, High Field Address Bits Default ALS Upper Threshold, Low 0x21 7:0 1111 1111 ALS upper interrupt threshold, Low byte ALS Upper Threshold, Mid 0x22 7:0 1111 1111 ALS upper interrupt threshold, Mid byte Confidential Description 21/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA 7:4 0000 Reserved 3:0 1111 ALS upper interrupt threshold, High byte 0x24 7:0 0000 0000 ALS lower interrupt threshold, Low byte ALS Lower Threshold, Mid 0x25 7:0 0000 0000 ALS lower interrupt threshold, Mid byte 7:4 0000 Reserved ALS Lower Threshold, High 0x26 3:0 0000 ALS lower interrupt threshold, High byte ALS Upper Threshold, High 0x23 ALS Lower Threshold, Low Confidential 22/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA 7 Application Information 7.1. Lux Formula Lux_Calc is the calculated lux reading based on the output ADC from ALS DATA regardless of light sources. ‫ݔݑܮ‬஼௔௟௖ = 0.74 × ‫ீܵܥ‬௥௘௘௡_஽஺்஺ ‫ܵܥ‬ூோ_஽஺்஺ × ቈ1 − ‫ܥ‬ଵ ቆ ቇ቉ × ܹி஺஼ (‫)ܶܰܫ × ܰܫܣܩ‬ ‫ீܵܥ‬௥௘௘௡_஽஺்஺ Where : 1. CS_Green_DATA = Data stored in the registers (Address: 0x0D-0x0F) 2. CS_IR_DATA = Data stored in the registers (Address: 0x0A-0x0C) 3. C1 = 0.033 constant coefficient. 4. For device under tinted window with coated-ink of flat transmission rate at 400-600nm wavelength, window factor is to compensate light loss due to the lower transmission rate from the coated-ink. a. WFAC = 1 for NO window / clear window glass. b. WFAC >1 device under tinted window glass. Calibrate under white LED. 5. The Gain factors & Integration time factors: Confidential ALS Gain GAIN Resolution (bit) / Integration Time (ms) INT X1 1 16-bit, 25ms 0.25 X3 3 17-bit, 50ms 0.5 X6 6 18-bit, 100ms 1 X9 9 19-bit, 200ms 2 X18 18 20-bit, 400ms 4 23/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA 7.2 Device Operation (State Machine and Interrupt Features) State Machine Below diagram is the main state machine of LTR-381RGB-WA. During the CS/ALS Operation, CS/ALS measurements can be activated by setting the CS_ALS_Enable bit to 1. As soon as the CS/ALS sensors become activated through an I2C command, the internal support blocks are powered on. Once the voltages and currents are settled (typically after 5ms), the state machine checks for trigger events from a measurement scheduler to start CS/ALS conversions according to the selected measurement repeat rates. Once CS_ALS_Enable is changed back to 0, a running conversion on the respective channel will be completed and the relevant ADCs and support blocks will move to power-down state. Confidential 24/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA Interrupt Features This device generates independent ALS/CS interrupt signal that can be multiplexed and output to the INT output pin. The interrupt conditions are always evaluated after completion of a new conversion of the ALS channels. ALS/CS interrupts is active low at the INT pin. ALS/CS Interrupt The ALS/CS interrupt is enabled by Bit 2 (ALS INT Pin Enabled) of INT_CFG register (0x19). The ALS/CS interrupt source can be any of the four CS channels (R, G, B and IR). The source is selected by Bit 4 and 5 (ALS INT Select) of INT_CFG register. The INT is set when the data of the selected interrupt source is above the upper or below the lower threshold for a specified number of consecutive measurements set in ALS/CS Persist in INT_PST register (0x1A). The Interrupt signal is also stored in MAIN_STATUS register (0x07) as flag bit in Bit 4 (ALS/CS INT Status). This status flag bit is cleared by reading the MAIN_STATUS register. A cleared flag will also clear the interrupt signal on the INT pin. Confidential 25/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA 8 Pseudo Codes Examples MAIN_CTRL Register // This defines the operating modes of the CS/ALS // Default settings is 0x00 (CS Mode = ALS, ALS/CS standby) Register_Addr = 0x00 // MAIN_CTRL register Command = 0x06 // ALS in Active Mode, CS mode = CS WriteByte(Slave_Addr, Register_Addr, Command); ALS_CS_MEAS_RATE Register // This controls the ALS/CS measurement resolution and measurement rate. // Default setting of the register is 0x22 (Resolution = 18 Bit, Measurement rate of 100ms) Register_Addr = 0x04 Command = 0x41 // ALS_CS_MEAS_RATE register // Resolution = 16 bit, Meas Rate =50ms // Command =0x25,Resolution = 18 bit, Meas Rate =1000ms // Command =0x02, Resolution = 20 bit, Meas Rate =100ms WriteByte(Slave_Addr, Register_Addr, Command) ALS_CS_GAIN Register // This controls the ALS/CS Gain Range. // Default setting of the register is 0x01 (Gain Range = 3) Register_Addr = 0x05 Command = 0x00 // ALS_CS_GAIN register // Gain = 1 // Command =0x04, Gain = 18 WriteByte(Slave_Addr, Register_Addr, Command) MAIN_STATUS Register (Read Only) // This Register contains the information on Interrupt, ALS/CS data status. Register_Addr = 0x07 Data = ReadByte(Slave_Addr, Register_Addr) // MAIN_STATUS register address Power_ON_Status = Data & 0x20 // If 0x20 Part went through power-up event // If 0x00 Normal // If 0x10 Interrupt triggered // If 0x00 Interrupt condition not fulfilled // If 0x08 ALS/CS data is new // If 0x00 Old (previously read) Data ALS/CS_Interrupt_Status = Data & 0x10 ALS/CS_Data_Status = Data & 0x08 CS_DATA_IR Registers (Read Only) //The register 0x0A contains CS_IR ADC lower byte data. //The register 0x0B contains CS_IR ADC 1 middle byte data. //The register 0x0C contains CS_IR ADC 2 upper byte data. //These registers should be read as a group, with the lower address being read first. Register_Addr = 0x0A Data0=ReadByte(Slave_Addr, Register_Addr) Register_Addr = 0x0B Data1=ReadByte(Slave_Addr, Register_Addr) Register_Addr = 0x0C Data2=ReadByte(Slave_Addr, Register_Addr) Confidential // CS_DATA_IR_0 low byte address // CS_DATA_IR_1 middle byte address // CS_DATA_IR_2 upper byte address 26/34 Part No. : LTR-381RGB-WA BNS-OD-FC002/A4 OPTICAL SENSOR LTR-381RGB-WA CS_IR_Data =(Data2