VD5377CBSW datasheet(64/88 Pages) STMICROELECTRONICS

Part #	VD5377CBSW

Description	Ultra-low power motion sensor for optical finger navigation (OFN)

PDF	88 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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64 / 88 page

I2C interface

VD5377

64/88

Doc ID 022952 Rev 2

I2C interface

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

1ms period).

11.1

Protocol

Figure 28. Serial interface data transfer protocol

11.2

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 29. VD5377 serial interface address

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

to as the index).

Start condition

Stop condition

SDA

SCL

Acknowledge

Address or data byte

MSB

LSB

R/W

VD5377CBSW Datasheet(PDF) 64 Page - STMicroelectronics