TDA744813TR View Datasheet(PDF) - STMicroelectronics
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Description
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TDA744813TR Datasheet PDF : 14 Pages
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TDA7448
5 SOFTWARE SPECIFICATION
Interface Protocol
The interface protocol comprises:
■ A start condition (S)
■ A chip address byte, containing the TDA7448 address
■ A subaddress bytes
■ A sequence of data (N byte + acknowledge)
■ A stop condition (P))
CHIP ADDRESS
SUBADDRESS
DATA 1 to DATA n
MSB
LSB
MSB
LSB
MSB
S 1 0 0 0 1 0 0 0 ACK X X X B
DATA
ACK
D96AU420
ACK = Acknowledge; S = Start;
P = Stop;
A = Address;
DATA
LSB
ACK P
B = Auto Increment
5.1 EXAMPLES
5.1.1 No Incremental Bus
The TDA7448 receives a start condition, the correct chip address, a subaddress with the B = 0 (no incremental
bus), N-data (all these data concern the subaddress selected), a stop condition.
CHIP ADDRESS
SUBADDRESS
DATA
MSB
LSB
MSB
LSB
MSB
S 1 0 0 0 1 0 0 0 ACK X X X 0 D3 D2 D1 D0 ACK
D96AU421
DATA
LSB
ACK P
5.1.2 Incremental Bus
The TDA7448 receivea start conditions, the correct chip address, a subaddress with the B = 1 (incremental bus):
now it is in a loop condition with an autoincrease of the subaddress whereas SUBADDRESS from "XXX1000"
to "XXX1111" of DATA are ignored.The DATA 1 concern the subaddress sent, and the DATA 2 concern the
subaddress sent plus one in the loop etc, and at the end it receivers the stop condition.
CHIP ADDRESS
SUBADDRESS
DATA 1 to DATA n
MSB
LSB
MSB
LSB
MSB
S 1 0 0 0 1 0 0 0 ACK X X X 1 D3 D2 D1 D0 ACK
D96AU422
DATA
LSB
ACK P
5.2 DATA BYTES
Address= 88 (HEX) (10001000): ADDR open; 8A (HEX) (10001010): connect to supply
Table 6. FUNCTION SELECTION: subaddress
MSB
D7
D6
D5
D4
D3
D2
X
X
X
B
0
0
X
X
X
B
0
0
X
X
X
B
0
0
X
X
X
B
0
0
X
X
X
B
0
1
X
X
X
B
0
1
X
X
X
B
0
1
X
X
X
B
0
1
LSB
D1
D0
SUBADDRESS
0
0 SPEAKER ATTENUATION OUT 1
0
1 SPEAKER ATTENUATION OUT 2
1
0 SPEAKER ATTENUATION OUT 3
1
1 SPEAKER ATTENUATION OUT 4
0
0 SPEAKER ATTENUATION OUT 5
0
1 SPEAKER ATTENUATION OUT 6
1
0 NOT USED”
1
1 NOT USED
B=1: INCREMENTAL BUS; ACTIVE
B=0: NO INCREMENTAL BUS
X= DON’T CARE
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