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BH1726NUC Schematic ( PDF Datasheet ) - ROHM Semiconductor

Teilenummer BH1726NUC
Beschreibung Digital 16bit Serial Output Type Ambient Light Sensor IC
Hersteller ROHM Semiconductor
Logo ROHM Semiconductor Logo 




Gesamt 20 Seiten
BH1726NUC Datasheet, Funktion
Datasheet
Ambient Light Sensor IC Series
Digital 16bit Serial Output Type
Ambient Light Sensor IC
BH1726NUC
General Description
BH1726NUC is a digital Ambient Light Sensor IC with I2C
bus interface. This IC is most suitable for obtaining
ambient light data for adjusting LCD and backlight power
of TV and mobile phone. It is capable of detecting a very
wide range of illuminance.
Key Specifications
VCC Voltage Range:
2.3V to 3.6V
Detection Range:
30klx (Typ)
Current Consumption:
75μA (Typ)
Power Down Current:
0.8μA (Typ)
Operating Temperature Range: -40°C to +85°C
Features
Built-in Ircut filter
2 outputs with different spectral response
Correspond to dark window because of high sensitivity
Rejecting 50Hz/60Hz light noise
I2C bus interface (f/s mode support)
It is possible to select 2 type of I2C bus slave address.
Correspond to 1.8V logic interface
Resolution 0.0003lx/count (Typ)
(In highest gain and longest measurement time setting)
Package(s)
WSON008X2120
W(Typ) x D(Typ) x H(Max)
2.10mm x 2.00mm x 0.6mm
Applications
Mobile Phone, Tablet PC, Note PC, Portable Game
Machine, LCD TV, Digital Camera
WSON008X2120
Typical Application Circuits
0.1uF
VCC
AMP
PD0
AMP
PD1
ADC ADC Logic
+
I2C Interface
+
INT Interface
ADC
OSC
POR
ADDR TEST GND
SCL
SDA
INT
Micro
Controller
or
Baseband
Processor
Product structureSilicon monolithic integrated circuit.
This product has no 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.
.www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111 14 001
1/16
TSZ02201-0M3M0F616020-1-2
28.Apr.2016 Rev.001






BH1726NUC Datasheet, Funktion
BH1726NUC
I2C bus Slave address
The slave address is selectable from 2 addresses by ADDR pin.
ADDR
L
H
Slave Address
0101001
0111001
Register MAP(Note 1)
Register
Address
Register Name
[4:0]
-- COMMAND
0x00 CONTROL
0x01 TIMING
0x02 INTERRUPT
0x03
0x04
TH_LOW
R/W D7
W
RW 0
RW
RW 0
RW
RW
D6 D5 D4 D3 D2 D1 D0
COMMAND CODE [7:0]
0
ADC_ ADC_
INTR VALID
0
0
ADC_
EN
POWER
ITIME [7:0]
0
INT_
LATCH
INT_EN
PERSIST [3:0]
TH_LOW_data [7:0]
TH_LOW_data [15:8]
0x05
0x06
TH_HIGH
RW
RW
TH_HIGH_data [7:0]
TH_HIGH_data [15:8]
0x07 GAIN
RW 0 0 0 0 DATA0_GAIN [1:0] DATA1_GAIN [1:0]
0x12 PART ID
R
PART ID [7:0]
0x14
0x15
DATA0
R
R
DATA0_data [7:0]
DATA0_data [15:8]
0x16
0x17
DATA1
R
R
DATA1_data [7:0]
DATA1_data [15:8]
0x18 WAIT
RW 0 0 0 0 0 0
(Note1)Do not write any commands to other address except above. Do not write '1' to the field in which value is '0' in above table.
0
WAIT_
EN
COMMAND
Fields
COMMAND CODE
( 0x00 ) CONTROL
Fields
ADC_INTR
ADC_VALID
ADC_EN
POWER
Function
100_Register Address[4:0]: Command to indicate register address
111_00001: Interrupt reset (Special Command)
111_00100: Software reset (Special Command)
Don’t input the other command.
All registers are reset and this IC becomes power down state by software reset.
default value 0x00
Function
Interrupt status output (Read only register)
0 : Interrupt is inactive.
1 : Interrupt is active.
Data register(DATA0, DATA1) status output (Read only register)
0 : Data registers are not updated after last reading.
1 : Data registers are updated after last reading.
0 : ADC measurement stop.
1 : ADC measurement start.
0 : ADC power down.
1 : ADC power on.
default value 0x00
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
6/16
TSZ02201-0M3M0F616020-1-2
28.Apr.2016 Rev.001

6 Page









BH1726NUC pdf, datenblatt
BH1726NUC
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 ICs power
supply pins.
2. Power Supply Lines
Design the PCB layout pattern to provide low impedance supply lines. Furthermore, connect a capacitor to ground at
all power supply pins. Consider the effect of temperature and aging on the capacitance value when using electrolytic
capacitors.
3. Ground Voltage
Ensure that no pins are at a voltage below that of the ground pin at any time, even during transient condition.
4. Ground Wiring Pattern
When using both small-signal and large-current ground traces, the two ground traces should be routed separately but
connected to a single ground at the reference point of the application board to avoid fluctuations in the small-signal
ground caused by large currents. Also ensure that the ground traces of external components do not cause variations
on the ground voltage. The ground lines must be as short and thick as possible to reduce line impedance.
5. Thermal Consideration
Should by any chance the maximum junction temperature rating be exceeded the rise in temperature of the chip may
result in deterioration of the properties of the chip. In case of exceeding this absolute maximum rating, increase the
board size and copper area to prevent exceeding the maximum junction temperature rating..
6. Recommended Operating Conditions
These conditions represent a range within which the expected characteristics of the IC can be approximately obtained.
The electrical characteristics are guaranteed under the conditions of each parameter.
7. Inrush Current
When power is first supplied to the IC, it is possible that the internal logic may be unstable and inrush current may flow
instantaneously due to the internal powering sequence and delays, especially if the IC has more than one power
supply. Therefore, give special consideration to power coupling capacitance, power wiring, width of ground wiring, and
routing of connections.
8. Operation Under Strong Electromagnetic Field
Operating the IC in the presence of a strong electromagnetic field may cause the IC to malfunction.
9. Testing on Application Boards
When testing the IC on an application board, connecting a capacitor directly to a low-impedance output pin may
subject the IC to stress. Always discharge capacitors completely after each process or step. The IC’s power supply
should always be turned off completely before connecting or removing it from the test setup during the inspection
process. To prevent damage from static discharge, ground the IC during assembly and use similar precautions during
transport and storage.
10. Inter-pin Short and Mounting Errors
Ensure that the direction and position are correct when mounting the IC on the PCB. Incorrect mounting may result in
damaging the IC. Avoid nearby pins being shorted to each other especially to ground, power supply and output pin.
Inter-pin shorts could be due to many reasons such as metal particles, water droplets (in very humid environment) and
unintentional solder bridge deposited in between pins during assembly to name a few.
11. Unused Input Pins
Input pins 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. So unless otherwise specified, unused input pins should be connected to the
power supply or ground line.
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
12/16
TSZ02201-0M3M0F616020-1-2
28.Apr.2016 Rev.001

12 Page





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