TDA7409 Datasheet, PDF (15/25 Pages) STMicroelectronics – CARRADIO-SIGNAL-PROCESSOR

TDA7409
2.0 I²C BUS INTERFACE
2.1 Interface Protocol
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)
s the max. CLOCK SPEED is 500kbits/s
CHIP ADDRESS
SUBADDRESS
DATA 1 to DATA n
MSB
LSB
MSB
LSB
MSB
LSB
S 1 0 0 0 1 0 0 R/W ACK I3 I2 I1 I0 A3 A2 A1 A0 ACK
ACK
ACK P
D99AU1044
S = Start
R/W ="0" -> Receive-Mode (Chip could be programmed by P)
"1" -> Transmission-Mode (Data could be received by P)
ACK = Acknowledge
P = Stop
2.2 TRANSMITTED DATA (send mode)
MSB
LSB
X
X
X
X
X
X
X
SM
SM = Soft mute activated
X = Not Used
The transmitted data is automatic updated after each ACK. Transmission can be repeated without new chipaddress.
2.3 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
1
1
1
1
1
LSB
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).
Note : All the blank bits in the following tables are "don't care"-bits.
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