AR0134CS_16 Datasheet, PDF (17/38 Pages) ON Semiconductor – 1/3-Inch 1.2 Mp CMOS Digital Image Sensor

AR0134CS: 1/3-Inch 1.2 Mp CMOS Digital Image Sensor
Two-Wire Serial Register Interface
Single READ from Random Location
This sequence (Figure 8 on page 17) starts with a dummy WRITE to the 16-bit address
that is to be used for the READ. The master terminates the WRITE by generating a restart
condition. The master then sends the 8-bit read slave address/data direction byte and
clocks out one byte of register data. The master terminates the READ by generating a no-
acknowledge bit followed by a stop condition. Figure 8 shows how the internal register
address maintained by the AR0134 is loaded and incremented as the sequence proceeds.
Figure 8: Single READ from Random Location
Previous Reg Address, N
Reg Address, M
M+1
S Slave Address 0 A Reg Address[15:8] A Reg Address[7:0] A Sr Slave Address 1 A
Read Data
AP
S = start condition
P = stop condition
Sr = restart condition
A = acknowledge
A = no-acknowledge
slave to master
master to slave
Single READ from Current Location
This sequence (Figure 9) performs a read using the current value of the AR0134 internal
register address. The master terminates the READ by generating a no-acknowledge bit
followed by a stop condition. The figure shows two independent READ sequences.
Figure 9: Single READ from Current Location
Previous Reg Address, N
Reg Address, N+1
N+2
S Slave Address 1 A Read Data A P
S Slave Address 1 A Read Data A P
AR0134CS/D Rev. 8, Pub. 1/16 EN
17
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