SC7315 datasheet(8/13 Pages) SILAN

8 / 13 page

SC7315

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.0

2004.08.03

Http: www.silan.com.cn

Page 8 of 13

Fig. 19 Acknowledge on the I

2C BUS

6. Transmission without acknowledge

Avoiding to detect the acknowledge of the audioprocessor, the microprocessor can use a simpler transmission:

simply it waits one clock without checking the slave acknowledgig, and sends the new data.

This approach of course is less protected from mis-working and decreases the noise immunity.

SOFTWARE SPECIFICATION

1. Interface protocol

The interface protocol comprises:

• A start conditions

• A chip address byte, containing the SC7315 address(the 8th bit of the bytes must be 0). The SC7315 must

always acknowledge at the end of each transmitted byte.

• A sequence of data(N-bytes + acknowledge)

• A stop condition (P)

S 1

ACK

DATA

ACK

DATA

MSB

LSB

SC7315 address

MSB

LSB

MSB

LSB

ACK

Data Transferred

(N-Bytes + Acknowledge)

ACK: Acknowledge

S: Start

P: Stop

Max clock speed: 100kbits/sec

2. Chips address

1 (MSB)

0 (LSB)

3. Data bytes

MSB

LSB

Function

Volume Control

Speaker ATT L

Speaker ATT R

Loudness control

Bass control

Treble control

Note: Ax=1.25dB steps;Bx=10dB steps;Cx=2dB steps;Gx=3.75dB steps;*=no effect.

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