Datasheet

TDA7309
8/14
4 SOFTWARE SPECIFICATION
4.1 Interface Protocol
The interface protocol comprises:
■ A start condition (s)
■ A chip address byte, containing the TDA7309 address (the 8th bit of the byte must be 0).
The TDA7309 must always acknowledge at the end of each transmitted byte.
■ A sequence of data (N-bytes + acknowledge)
■ A stop condition (P)
Figure 19.
ACK = Acknowledge
S = Start
P = Stop
MAX CLOCK SPEED 400kbits/s
Table 7. Chip address
Table 8. Function Codes
Table 9. Channel Abilitation Codec
MSB LSB
00110010pin address open
00110000pin address close to ground
MSBF6F5F4F3F2F1LSB
VOLUME 0XXXXXXX
MUTE/LOUD 1 0 0 X X X X X
INPUTS 1 0 1 X X X X X
CHANNEL 1 1 0 X X X X X
MSB F6 F5 F4 F3 F2 F1 LSB FUNCTION
1 1 0 channel
XXX0 0RIGHT
XXX0 1LEFT
XXX1 0BOTH
XXX1 1BOTH