AR0330 Datasheet, PDF (62/77 Pages) ON Semiconductor – CMOS Digital Image Sensor

AR0330: 1/3-Inch CMOS Digital Image Sensor
Two-Wire Serial Register Interface
Single READ From Random Location
This sequence (Figure 42) 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-acknowl-
edge bit followed by a stop condition. Figure 42 shows how the internal register address
maintained by the AR0330 is loaded and incremented as the sequence proceeds.
Figure 42: 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 43) performs a read using the current value of the AR0330 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 43: Single READ From Current Location
Previous Reg Address, N
S Slave Address 1 A Read Data
AP
Reg Address, N+1
N+2
S Slave Address 1 A Read Data A P
AR0330_DS Rev. U Pub. 4/15 EN
62
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