AV2188

June 2, 2000

9-20

INFINITE ZERO DETECTION

The AV2188 has an Infinite Zero Detection circuit which detects zero in the Audio Serial Port that lasts for

approximately 0.5 sec. By default, the zero detection circuit is on. To disable this feature, bit 7 of the programmable

register TREG1[7] must be programmed to a “one”.

SERIAL COMMAND PORT

The user can use the pin to select the chip operation or by programming the internal control registers through the 7

bit address I

3 byte data to AV2188, following each byte are the acknowledges generated by AV2188. The first byte is the 7-bit

Chip Address followed by the read/write bit (read is high write is low). The second byte is the control register

address. The third byte is the control register data.

Upon power up, all programmable registers are set to default values. Figure 4 describes the serial command port

timing relationship.

Figure 4. Serial Command Port Timing

R/W ACK

A7

A0

D0

ACK

D7

ACK

Start

Stop

CA6

CA0

11

1

Chip adrress: CA<6:0> = 31H

Register address: A<7:0> = 00H

DATA: D<7:0> = 30H

SDA

SCL