PixArt Imaging Inc.
ADBS-A350 Optical Finger Navigation
Example: Single Byte Read from Sensor Register
The sensor reads a value 0x01from the register address 0x02 in the following illustration. Again, the example ADBS-A350
address is 0x57.
ADBS
Address 0 x 57
Register Address
0 x 02
Packet
number
1
2
Packet
type
DA
RA
7
0
0
7
0
SDA
START
1010111
0 0000010
host
R/W
ai
SDA
ADBS
ACK
ACK
ADBS
Address 0 x 57
Data 0 x 01
4
Packet
3
number
Host could
also drive
another
START
condition
instead of a
STOP
Packet
type
DA
DP
7
0
1
SDA
START 1010 111
NAK STOP
host
R/W
7
0
SDA
condition
ACK
00000001
ADBS
Figure 23. TWI single byte read
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PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
23
PIXART [ PIXART IMAGING INC. ]
