VT5376

Interface

9/30

4

Interface

The interface is 400 kHz I2C, with very fast polling rate for high CPI applications (down to

1 ms period).

4.1

Protocol

Figure 3.

Serial interface data transfer protocol

4.2

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.

VT5376 serial interface address

The byte following the address byte contains the address of the first data byte (also referred

to as the index).

12

7

8

A

Start condition

Stop condition

SDA

SCL

Acknowledge

P

S

3

4

56

Address or data byte

MSB

LSB

001

00

00

R/W