ALS-PDIC17-79NB-TR8_15 Datasheet, PDF (8/19 Pages) Everlight Electronics Co., Ltd – Digital Ambient Light Sensor

DATASHEET
SMD  I²C Digital Ambient Light Sensor
ALS-PDIC17-79NB/TR8
17
S Slave Address
(a) Send byte protocol
1
18
WR A Command Byte
0
0
11
AP
0
17
1
S Slave Address RD
1
(b) Receive byte protocol
18
A Data
0
1
1
NA P
1
17
1
1
S Slave Address RD A
1
0
(c) Receive word (two bytes) protocol
8
LS byte of ADC
18
A MS byte of ADC
0
S = start condition P = stop condition
Shaded = slave transmission
A = acknowledge NA = not acknowledge
WR = write RD= read
1
1
NA P
1
Figure 13 Communication Protocol
Communication Format
ALS-PDIC17-79NB is capable of working as an I²C slave. Address of this device on I²C bus is always 0x39
(hexadecimal number 39). Registers of the slave device can be programmed by sending commands over I²C bus.
Figure 14 shows an I²C write operation. To write to an internal register of the slave device a command must be
sent by an I²C master. As illustrated in Figure 14, the I²C write command begins with a start condition. After the start
condition, seven bits of address are sent with MSB going first. RD / WRn (=Low) command bit follows the address bits.
Upon receiving a valid address the slave device responds by driving SDA low for an ACK. After receiving an ACK, I²C
master sends eight bits of data with MSB first. Upon receiving eight bits of data the slave device generates an ACK. I²C
master terminates this write command with a stop condition.
Figure 14 I²C Timing Diagram for Send Byte Format
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