ALS-PDIC17-79NB-TR8 Datasheet, PDF (10/21 Pages) Everlight Electronics Co., Ltd – I2 Digital Ambient Light Sensor

Surface - Mount
I²C Digital Ambient Light Sensor
ALS-PDIC17-79NB/TR8
START
Device Address 0x39 (Hex) ^{R/W A}
Data to Master
A
STOP
SDA
(Master OUT)
A6 A5 A4 A3 A2 A1 A0 R
SDAdriven bySlave
NA
SDA
(Slave OUT)
SCL
(Master OUT)
SDAdriven byMaster
A _{D7 D6 D5 D4 D3 D2 D1 D0}
123456789123456789
Figure 13 I²C Timing Diagram for Receive Byte Format
Ambient light intensity count value can be obtained by reading registers of this device. Ambient light
intensity count is a 15-bit wide number plus a valid bit and hence word (two bytes) read operation is needed,
as shown in Figure 14. After receiving the two byte data, the I²C master terminates this transaction by issuing
a NACK command to indicate that the master only wanted to read two bytes from the device. The master
generates a stop condition to end this transaction.
START _{DeviceAddress 0x39 (Hex)} R/W A
LS byte of ADC register
A
MS byte of ADC Register
A STOP
SDA
(Master OUT)
A6 A5 A4 A3 A2 A1 A0 R
SDAdriven bySlave
A
SDAdriven bySlave
NA
SDA
(Slave OUT)
SCL
(Master OUT)
SDAdriven byMaster
A _{D7 D6 D5 D4 D3 D2 D1 D0}
D7 D6 D5 D4 D3 D2 D1 D0
123456789123456789123456789
Figure 14. I²C Timing Diagram for Receive Word Format
Everlight Electronics Co., Ltd.
Document No: DLS-xxxxxxx Rev1
10
http://www.everlight.com
Oct. 12, 2010