Data Sheet

ManualsBrandsPimoroni ManualsInfrared & Light SensorsBH1745 Luminance and Colour Sensor

○Product structure：Silicon monolithic integrated circuit. ○This product is not designed protection against radioactive rays.

○This product does not include laser transmitter. ○This product does not include optical load.

○This product includes Photo detector, ( Photo Diode ) inside of it.

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TSZ02201-0M3M0F616080-1-2

23.May.2016 Rev.002

TSZ22111・14・001

www.rohm.com

Ambient light sensor ICs

Digital 16bit Serial Output Type

Color Sensor IC

BH1745NUC

General Description

BH1745NUC is digital color sensor IC with I2C bus

interface. This IC senses Red, Green and Blue light

(RGB) and converts them to digital values. The high

sensitivity, wide dynamic range and excellent Ircut

characteristics makes this IC the most suitable to obtain

the illuminance and color temperature of ambient light

for adjusting LCD backlight of TV, mobile phone and

tablet PC. It is possible to detect very wide range light

intensity. (0.005 – 40k lx)

Features

 The Excellent Ircut Characteristics with an Ircut Filter

 The High Sensitivity and Wide Dynamic Range

(0.005 – 40k lx)

 Supports Low Transmittance (Dark) Window

 Correspond to I

C Bus Interface ( f/s mode support )

 Low Current by Power Down Function

 Rejecting 50Hz/60Hz Light Noise

 Correspond to 1.8V Logic Interface

 Programmable Interrupt Function

 It is possible to select 2 type of I

C bus slave address.

(ADDR =’L’: “0111000”, ADDR =’H’: “0111001”)

Applications

LCD TV, Mobile phone, NOTE PC, Tablet PC, Portable

game machine, Digital camera, Digital video camera,

PDA, LCD display

Key Specifications

 VCC Voltage Range: 2.3V to 3.6V

 Maximum Sensitivity: 0.005Lx/step

 Current Consumption: 130μA (Typ)

 Standby Mode Current: 0.8μA (Typ)

 Operating Temperature Range: -40°C to +85°C

Package(s) W(Typ) x D(Typ) x H(Max)

WSON008X2120 2.10mm x 2.00mm x 0.6mm

Typical Application Circuits

WSON008X2120

SDA

SCL

2.3V – 3.6V

Micro

Controller

Baseband

Processor

INT

TEST

1.65V – 5.5V

(ex. 0.1µF)

SDA

VCC

ADC

BLUERED GREEN

IRCUT FILTER

ADC

CLEAR

OSC POR

GND

SCL

INT

TEST

ADC Logic

C Interface

INT Interface

ADDR

SDA

VCC

ADC

BLUERED GREEN

IRCUT FILTER

ADC

CLEAR

OSC POR

GND

SCL

INT

TEST

ADC Logic

C Interface

INT Interface

ADDR

1.8V – 3.6V

Datashee

Summary of content (23 pages)

PAGE 1
Datasheet Ambient light sensor ICs Digital 16bit Serial Output Type Color Sensor IC BH1745NUC General Description Key Specifications BH1745NUC is digital color sensor IC with I2C bus interface. This IC senses Red, Green and Blue light (RGB) and converts them to digital values.
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BH1745NUC Pin Configuration TOP VIEW ADDR 1 8 NC VCC 2 7 INT GND 3 6 SDA TEST 4 5 SCL Pin Description Pin No. Pin Name Function 2 1 ADDR 2 VCC I C bus slave address terminal Power supply terminal 3 GND GND terminal 4 TEST Test terminal. Connect to GND. 5 SCL I C bus Interface SCL terminal. 6 SDA 7 INT 8 NC I C bus Interface SDA terminal. Nch open drain output. Interrupt setting is defined by internal register. Register value is 2 possible to configure by I C bus.
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BH1745NUC Absolute Maximum Ratings (Ta = 25°C) Parameter Symbol Rating Unit VCCMAX -0.3 to +4.5 V VADDRMAX,VSDAMAX, VSCLMAX, VTESTMAX -0.3 to +4.5 V VINTMAX 7 V Operating Temperature TOPR -40 to +85 °C Storage Temperature TSTG -40 to +100 °C INT, SDA Sink Current IMAX 7 mA Power Dissipation PD 0.40 VCC, Supply Voltage ADDR, SDA, SCL, TEST Terminal Voltage INT Terminal Voltage (Note 1) W (Note 1) Reduce by 5.33mW/°C over 25°C, when mounted on 2-layer PCB of 114.3mm × 76.
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BH1745NUC 2 I C Bus Timing Characteristics (Unless otherwise specified VCC=2.5V Ta=25°C) Parameter Symbol Min Typ Max Unit fSCL 0 － 400 kHz tHD;STA 0.6 －－ µs 2 tLOW 1.3 －－ µs 2 tHIGH 0.6 －－ µs tSU;STA 0.6 －－ µs 2 tHD;DAT 0 －－ µs 2 tSU;DAT 100 －－ ns 2 tSU;STO 0.6 －－ µs tBUF 1.3 －－ µs 2 tVD;DAT －－ 0.9 µs 2 tVD;ACK －－ 0.
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BH1745NUC Typical Performance Curves 1.0 10 Blue Green 8 Red Calculated Illuminance [lx] Sensitivity Ratio 0.8 0.6 0.4 Clear 0.2 4 2 0.0 400 6 0 500 600 700 800 900 Wavelength [nm] 1000 1100 -40 0 20 40 Ta [ ℃ ] 60 80 100 Figure 2. Temperature Dependency of Dark ( 0 lx ) Sensor out from RGBC (MODE_CONTROL2=10h) Figure 1. RGBC Spectral Response 1.2 1.2 1.0 1.0 0.8 0.8 - 0.6 1pin + Ratio Ratio -20 0.4 0.6 0.4 - - - + + 1pin + 0.2 0.2 0.0 0.
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BH1745NUC Typical Performance Curves - continued 8000 Fluorescent Light White LED 1.00 7000 1.06 Incandescent Light (Dimming) 0.98 Halogen Light 1.06 White LED 1.03 Calculated CCT [K] Fluorescent light Incandescent Light 6000 5000 4000 Incandescent light Halogen light 3000 Incandescent light (Dimming) 2000 0.0 0.5 1.0 1.5 2.0 4000 6000 8000 CCT [K] Ratio Figure 5. Light Source Dependency of lx calculation from RGBC (Fluorescent Light is set to “1”) www.rohm.
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BH1745NUC Command Set Address TYPE Default Register Name Register Function 40h RW 0Bh SYSTEM_CONTROL System control 41h RW 00h MODE_CONTROL1 Function setting 42h RW 00h MODE_CONTROL2 Function setting 44h RW 00h MODE_CONTROL3 Function setting 50h R 00h RED_DATA_LSBs Low byte of RED 51h R 00h RED_DATA_MSBs High byte of RED 52h R 00h GREEN_DATA_LSBs Low byte of GREEN 53h R 00h GREEN_DATA_MSBs High byte of GREEN 54h R 00h BLUE_DATA_LSBs Low byte of BLUE 55h R
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BH1745NUC ○ MODE_CONTROL2 ( 42h ) Field Bit TYPE 7 R Reserved 6:5 RW RGBC_EN 4 RW Reserved 3:2 RW ADC GAIN 1:0 RW VALID Description 0 : RGBC data is not updated after last writing MODE_CONTROL1,2,3 register or last reading MODE_CONTROL2 register. 1 : RGBC data is updated after last writing MODE_CONTROL1,2,3 register or last reading MODE_CONTROL2 register. Write 00 0 : RGBC measurement is inactive and becomes power down. 1 : RGBC measurement is active.
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BH1745NUC ○ CLEAR_DATA_LSBs( 56h ) Register TYPE CLEAR_DATA_LSBs R 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 2 2 2 2 2 2 2 2 0 Default value 00h ○ CLEAR_DATA_MSBs( 57h ) Register TYPE CLEAR_DATA_MSBs R 7 2 15 6 2 14 5 2 13 4 2 12 3 2 11 2 2 10 1 0 9 2 2 8 Default value 00h ○ DINT_DATA_LSBs( 58h ) Register TYPE Reserved R 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 2 2 2 2 2 2 2 2 0 Default value 00h ○ DINT_DATA_MSBs( 59h ) Register TYPE Reserved R 7 2
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BH1745NUC ○ TH_LSBs ( 62h ) Register TH_LSBs TYPE RW 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 2 2 2 2 2 2 2 2 0 Default value FFh ○ TH_MSBs ( 63h ) Register TH_MSBs TYPE RW 7 2 15 6 2 14 5 2 13 4 2 12 3 2 11 2 2 10 1 0 9 2 2 8 Default value FFh ○ TL_LSBs ( 64h ) Register TL_LSBs TYPE RW 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 2 2 2 2 2 2 2 2 0 Default value 00h ○ TL_MSBs ( 65h ) Register TL_MSBs TYPE RW 7 2 15 6 2 14 5 2 13 4 2 12 3 2 11 2 2 10
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BH1745NUC Explanation of Software Reset Command All registers are reset and BH1745NUC becomes power down by Software reset command. Explanation of Accessing MODE_CONTROL If master Writes to MODE_CONTROL1(41h), MODE_CONTROL2(42h) and MODE_CONTROL3(44h) register, RGBC measurement currently in progress is interrupted immediately and re-started from the beginning, and VALID register returns to ‘L’. When the re-started measurement is finished, VALID register turns to ‘H’.
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BH1745NUC 2 I C Bus Communication 1) Slave address "0111000" (ADDR = ‘L’) or “0111001” (ADDR = ‘H’) 2) Main write format 1. Case of Indicate register address ST 2.
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BH1745NUC Interrupt Function Interrupt function compares the measurement result selected from RGBC data by INT SOURCE register (60h<3:2>) to preset interrupt threshold level. Interrupt status is monitored by INT pin. Interrupt function is able to be controlled by INTERRUPT register (60h). Interrupt persistence is defined at PERSIST register (61h). INT pin is Nch open drain terminal so this terminal should be pull-up to some kind of voltage source by an external resister.
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BH1745NUC I/O Equivalent Circuit PIN No. 1 Pin Name ADDR Equivalent Circuit VCC 2 VCC 3 GND 4 TEST 5 SCL 6 SDA 7 INT 8 NC www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 14/19 TSZ02201-0M3M0F616080-1-2 23.May.2016 Rev.
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BH1745NUC Operational Notes 1. Reverse Connection of Power Supply Connecting the power supply in reverse polarity can damage the IC. Take precautions against reverse polarity when connecting the power supply, such as mounting an external diode between the power supply and the IC’s power supply terminals. 2. Power Supply Lines Design the PCB layout pattern to provide low impedance supply lines.
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BH1745NUC Operational Notes – continued 11. Unused Input Terminals Input terminals of an IC are often connected to the gate of a MOS transistor. The gate has extremely high impedance and extremely low capacitance. If left unconnected, the electric field from the outside can easily charge it. The small charge acquired in this way is enough to produce a significant effect on the conduction through the transistor and cause unexpected operation of the IC.
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BH1745NUC Ordering Information B H 1 7 4 5 Part Number N U C - Package NUC : WSON008X2120 E2 Packaging and forming specification E2: Embossed tape and reel Marking Diagram WSON008X2120(TOP VIEW) Part Number Marking A C 1 PIN MARK LOT Number Optical design for the device 2mm 1mm 1.05mm 2.1mm 0.29mm sensitive area 0.6 x 0.6mm www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 17/19 TSZ02201-0M3M0F616080-1-2 23.May.2016 Rev.
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BH1745NUC Physical Dimension, Tape and Reel Information Package Name www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 WSON008X2120 18/19 TSZ02201-0M3M0F616080-1-2 23.May.2016 Rev.
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BH1745NUC Revision History Date Revision Changes 30.Jun.2014 001 New Release 23.May.2016 002 Correct description of VALID register. Correct register name. Correct “Operational Notes”. www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 19/19 TSZ02201-0M3M0F616080-1-2 23.May.2016 Rev.
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Notice Precaution on using ROHM Products 1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment, OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.).
PAGE 21
Precautions Regarding Application Examples and External Circuits 1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the characteristics of the Products and external components, including transient characteristics, as well as static characteristics. 2. You agree that application notes, reference designs, and associated data and information contained in this document are presented only as guidance for Products use.
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Datasheet General Precaution 1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents. ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny ROHM’s Products against warning, caution or note contained in this document. 2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior notice.
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