TDA7402 Datasheet, PDF (40/59 Pages) STMicroelectronics – CARRADIO SIGNAL PROCESSOR

TDA7402
9.0 I C BUS INTERFACE
9.1 Interface Protocol
s The interface protocol comprises:
s a start condition (S)
s a chip address byte (the LSB bit determines read / write transmission)
s a subaddress byte
s a sequence of data (N-bytes + acknowledge)
s a stop condition (P)
CHIP ADDRESS
SUBADDRESS
DATA 1....DATA n
MSB
LSB
MSB
LSB
MSB
S 1 0 0 0 1 1 0 R/W ACK C AZ I A A A A A ACK
S = Start
R/W = ”0” -> Receive-Mode (Chip could be programmed by µP)
”1” -> Transmission-Mode (Data could be received by µP)
ACK = Acknowledge
P = Stop
MAX CLOCK SPEED 500kbits/s
DATA
LSB
ACK P
9.2 Auto increment
If bit I in the subaddress byte is set to ”1”, the autoincrement of the subaddress is enabled.
9.3 TRANSMITTED DATA (send mode)
MSB
LSB
X X X X X P ST SM
SM = Soft mute activated
ST = Stereo
P = Pause
X = Not Used
The transmitted data is automatically updated after each ACK.
Transmission can be repeated without new chipaddress.
9.4 Reset Condition
A Power-On-Reset is invoked if the Supply-Voltage is below than 3.5V. After that the following data is written
automatically into the registers of all subaddresses :
MSB
LSB
1 1111 1 1 0
The programming after POR is marked bold-face / underlined in the programming tables.
With this programming all the outputs are muted to V_REF (V_OUT= V_DD/2).
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