vt5376 STMicroelectronics, vt5376 Datasheet - Page 9

• Manufacturer Part Number: vt5376
• Description: Ultra-low Power Laser Motion Sensor For Laser Mouse Applications
• Manufacturer: STMicroelectronics

VT5376
4
4.1
4.2
Interface
The interface is 400 kHz I2C, with very fast polling rate for high CPI applications (down to
1 ms period).
Protocol
Figure 3.
Data format
Information is packed in 8-bit packets (bytes) always followed by an acknowledge bit. The
internal data is produced by sampling sda at a rising edge of scl . The external data must be
stable during the high period of scl . The exceptions to this are start (S) or stop (P) conditions
when sda falls or rises respectively, while scl is high.
The first byte contains the device address byte which includes the data direction read, (r) ,
~write , (~w), bit.
Figure 4.
The byte following the address byte contains the address of the first data byte (also referred
to as the index ).
SDA
SCL
Start condition
S
Serial interface data transfer protocol
VT5376 serial interface address
MSB
1
0
2
Address or data byte
0
3
4
1
5
0
6
0
7
0
LSB
8
0
Stop condition
R/W
A
Acknowledge
Interface
P
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