TDA7561 Software specifications
All the functions of the TDA7561 are activated by I
2
C interface.
The bit 0 of the "Address byte" defines if the next bytes are write instruction (from µP to
TDA7561) or read instruction (from TDA7561 to µP).
Chip address
D0
X D8 Hex
D7
1 1 0 1 1 0
X = 0 Write to device
X = 1 Read from device
If R/W = 0, the µP sends 2 "Instruction Bytes": IB1 and IB2.
Table 6.
Bit
D7
D6
D5
D4
D3
D2
D1
D0
IB1
X
Diagnostic enable (D6 = 1)
Diagnostic defeat (D6 = 0)
Offset detection enable (D5 = 1)
Offset detection defeat (D5 = 0)
Front channel
Gain = 26dB (D4 = 0)
Gain = 12dB (D4 = 1)
Rear channel
Gain = 26dB (D3 = 0)
Gain = 12dB (D3 = 1)
Mute front channels (D2 = 0)
Unmute front channels (D2 = 1)
Mute rear channels (D1 = 0)
Unmute rear channels (D1 = 1)
X
Instruction decoding bit
0
Doc ID 8326 Rev 6 19/27
Software specifications TDA7561
Table 7.
Bit
D7
D6
D5
D4
D3
D2
D1
D0
IB2
Instruction decoding bit
X
X
X
X
Used for testing
Used for testing
Standby on - Amplifier not working - (D4 = 0)
Standby off - Amplifier working - (D4 = 1)
Power amplifier mode diagnostic (D3 = 0)
Line driver mode diagnostic (D3 = 1)
If R/W = 1, the TDA7561 sends 4 "Diagnostics Bytes" to µP: DB1, DB2, DB3 and DB4.
Table 8.
Bit
D7
D6
D5
D4
D3
D2
D1
D0
DB1
Instruction decoding bit
Thermal warning active (D7 = 1)
Diag. cycle not activated or not terminated (D6 = 0)
Diag. cycle terminated (D6 = 1)
X
Channel LFTurn-on diagnostic (D4 = 0)
Permanent diagnostic (D4 = 1)
Channel LF
Normal load (D3 = 0)
Short load (D3 = 1)
Channel LFTurn-on diag.: No open load (D2 = 0)
Open load detection (D2 = 1)
Offset diag.: No output offset (D2 = 0)
Output offset detection (D2 = 1)
Channel LFNo short to Vcc (D1 = 0)Short to Vcc (D1 = 1)
Channel LFNo short to GND (D1 = 0)Short to GND (D1 = 1)
20/27 Doc ID 8326 Rev 6
TDA7561
Table 9.
Bit
D7
D6
D5
D4
D3
D2
D1
D0
DB2
Instruction decoding bit
Offset detection not activated (D7 = 0)
Offset detection activated (D7 = 1)
X
X
Channel LRTurn-on diagnostic (D4 = 0)
Permanent diagnostic (D4 = 1)
Channel LRNormal load (D3 = 0)
Short load (D3 = 1)
Channel LRTurn-on diag.: No open load (D2 = 0)
Open load detection (D2 = 1)
Permanent diag.: No output offset (D2 = 0)
Output offset detection (D2 = 1)
Channel LR
No short to Vcc (D1 = 0)
Short to Vcc (D1 = 1)
Channel LR
No short to GND (D1 = 0)
Short to GND (D1 = 1)
Table 10.
DB3
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Instruction decoding bit
Standby status (= IB1 - D4)
Diagnostic status (= IB1 - D6)
X
Channel RFTurn-on diagnostic (D4 = 0)
Permanent diagnostic (D4 = 1)
Channel RFNormal load (D3 = 0)
Short load (D3 = 1)
Channel RF
Turn-on diag.: No open load (D2 = 0)
Open load detection (D2 = 1)
Permanent diag.: No output offset (D2 = 0)
Output offset detection (D2 = 1)
Channel RFNo short to Vcc (D1 = 0)
Short to Vcc (D1 = 1)
Channel RFNo short to GND (D1 = 0)
Short to GND (D1 = 1)
Software specifications
Doc ID 8326 Rev 6 21/27
Software specifications
Table 11.
DB4
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Instruction decoding bit
X
X
X
Channel RR
Turn-on diagnostic (D4 = 0)
Permanent diagnostic (D4 = 1)
Channel RR
Normal load (D3 = 0)
Short load (D3 = 1)
Channel RR
Turn-on diag.: No open load (D2 = 0)
Open load detection (D2 = 1)
Permanent diag.:No output offset (D2 = 0)
Output offset detection (D2 = 1)
Channel RRNo short to Vcc (D1 = 0) Short to Vcc (D1 = 1)
Channel RRNo short to GND (D1 = 0) Short to GND (D1 = 1)
TDA7561
22/27 Doc ID 8326 Rev 6
