PAS005B Datasheet, PDF (36/41 Pages) Pixart Imaging Inc. – SXGA Color/Mono Digital CMOS Image Sensor

PixArt Imaging Inc.
PAS005B
CMOS Image Sensor IC
5.2.2 Slave transmits data to master (read cycle)
ƒ The sub-address was taken from previous write cycle
ƒ The sub-address is automatically increment after each byte read
ƒ Am : Acknowledge by master
ƒ Note there is no acknowledgment from master after last byte read
1ST BYTE
S
SLAVE ADDRESS
(7 BITS)
RW
A
2ND BYTE
DATA (8 BIT)
n BYTE
Am DATA Am DATA 1 P
NO ACK IN LAST
BYTE
During read cycle, the master generates start condition and then place the 1^st byte data that are combined
slave address (7 bits) with a read/write control bit to SDA line. After issue acknowledgment, 8 bits DATA was
also placed on SDA line by PAS005B. The 8 bit data was read from PAS005B internal control register that
address was assigned by previous write cycle. Follow the master acknowledgment, the PAS005B place the next 8
bits data (address is increment automatically) on SDA line and then transmit to master serially. The DATA and
Am cycles is repeat until the last byte read. After last byte read, Am is no longer generated by master but instead
by keep SDA line high. The slave (PAS005B) must releases SDA line to master to generate STOP condition.
(Please refer to Fig 5.3.)
4%"
4$-
4
4UBSU
$POEJUJPO






"EESFTT
38
"$,
GSPN
3FDFJWFS
%BUB
"$,
GSPN
3FDFJWFS
Fig 5.3 Data Transfer Format


%BUB

1
"$, 4UPQ
GSPN $POEJUJPO
3FDFJWFS
All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission.
PixArt Imaging Inc.
E-mail: [e-mail]