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TDA7561

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TDA7561 Software specifications
Doc ID 8326 Rev 6 19/27
7 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
X = 0 Write to device
X = 1 Read from device
If R/W = 0, the µP sends 2 "Instruction Bytes": IB1 and IB2.
D7 D0
1101100XD8 Hex
Table 6. IB1
Bit Instruction decoding bit
D7 X
D6
Diagnostic enable (D6 = 1)
Diagnostic defeat (D6 = 0)
D5
Offset detection enable (D5 = 1)
Offset detection defeat (D5 = 0)
D4
Front channel
Gain = 26dB (D4 = 0)
Gain = 12dB (D4 = 1)
D3
Rear channel
Gain = 26dB (D3 = 0)
Gain = 12dB (D3 = 1)
D2
Mute front channels (D2 = 0)
Unmute front channels (D2 = 1)
D1
Mute rear channels (D1 = 0)
Unmute rear channels (D1 = 1)
D0 X
Software specifications TDA7561
20/27 Doc ID 8326 Rev 6
If R/W = 1, the TDA7561 sends 4 "Diagnostics Bytes" to µP: DB1, DB2, DB3 and DB4.
Table 7. IB2
Bit Instruction decoding bit
D7 X
D6 Used for testing
D5 Used for testing
D4
Standby on - Amplifier not working - (D4 = 0)
Standby off - Amplifier working - (D4 = 1)
D3
Power amplifier mode diagnostic (D3 = 0)
Line driver mode diagnostic (D3 = 1)
D2 X
D1 X
D0 X
Table 8. DB1
Bit Instruction decoding bit
D7 Thermal warning active (D7 = 1)
D6
Diag. cycle not activated or not terminated (D6 = 0)
Diag. cycle terminated (D6 = 1)
D5 X
D4
Channel LFTurn-on diagnostic (D4 = 0)
Permanent diagnostic (D4 = 1)
D3
Channel LF
Normal load (D3 = 0)
Short load (D3 = 1)
D2
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)
D1 Channel LFNo short to Vcc (D1 = 0)Short to Vcc (D1 = 1)
D0 Channel LFNo short to GND (D1 = 0)Short to GND (D1 = 1)
TDA7561 Software specifications
Doc ID 8326 Rev 6 21/27
Table 9. DB2
Bit Instruction decoding bit
D7
Offset detection not activated (D7 = 0)
Offset detection activated (D7 = 1)
D6 X
D5 X
D4
Channel LRTurn-on diagnostic (D4 = 0)
Permanent diagnostic (D4 = 1)
D3
Channel LRNormal load (D3 = 0)
Short load (D3 = 1)
D2
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)
D1
Channel LR
No short to Vcc (D1 = 0)
Short to Vcc (D1 = 1)
D0
Channel LR
No short to GND (D1 = 0)
Short to GND (D1 = 1)
Table 10. DB3
Bit Instruction decoding bit
D7 Standby status (= IB1 - D4)
D6 Diagnostic status (= IB1 - D6)
D5 X
D4
Channel RFTurn-on diagnostic (D4 = 0)
Permanent diagnostic (D4 = 1)
D3
Channel RFNormal load (D3 = 0)
Short load (D3 = 1)
D2
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)
D1
Channel RFNo short to Vcc (D1 = 0)
Short to Vcc (D1 = 1)
D0
Channel RFNo short to GND (D1 = 0)
Short to GND (D1 = 1)
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TDA7561

Mfr. #:
Buy TDA7561
Manufacturer:
STMicroelectronics
Description:
Audio Amplifiers Quad Power Amplifier
Lifecycle:
New from this manufacturer.
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