AV2636

Product Datasheet

SERIAL CONTROL INTERFACE

The AV2636 supports a 2-wire I

pulled high, the FMTC and FMTD pins function as SCL and SDA. Where SCL is serial clock input and

SDA is serial data input and output. The internal control registers can be programmed through the

interface.

The chip ID for the AV2636 is a 7-bit hexadecimal number “32hex”. The protocol for write operation

consists of sending 3 bytes of data to the AV2636 at SDA pin. Following each byte is the acknowledge bit

generated by the AV2636. The first byte is the 7-bit chip ID followed by the read/write bit (read is logic

high and write is logic low). The second byte is control register address. The third byte is control register

data. The following diagram shows a “write” sequence and timing of control register address 00H and

data 30H.

SDA

SCL

START CA6

CA0 R/W ACK A7 A6 A5 A4 A3 A2 A1 A0 ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK STOP

0

1

1

0

0

1

1

Chip ID:

CA[6:0] = 0110010

Register Address: A[7:0] = 00H

Data:

D[7:0] = 30H

Timing specifications

STOP

START

STOP

START

SDA

SCL

Symbol

Descriptions

Min

Max

Units

SCL clock frequency

100

kHz

START condition SDA setup time

4.7

µs

START condition SDA hold time

4.0

µs

STOP condition SDA setup time

4.0

µs

SCL low pulse time

4.7

µs

SCL high pulse time

4.0

µs

tr

SCL and SDA rise time

1.0

µs

tf

SCL and SDA fall time

0.3

µs

Data setup time

250

ns

Data hold time

0

ns

Bus free time

4.7

µs

AVS Technology, Inc.

9-16

August 18, 2004

www.avstech.com