TDA7448 STMicroelectronics, TDA7448 Datasheet - Page 6

• Manufacturer Part Number: TDA7448
• Description: IC, VOLUME CNTRL, 6CH, 20SO
• Manufacturer: STMicroelectronics

Specifications of TDA7448

• Audio Control Type: Volume
• Control Interface: I2C
• Operating Temperature Range: 0°C To +70°C
• Audio Ic Case Style: SO
• No. Of Pins: 20
• Svhc: No SVHC (15-Dec-2010)
• Base Number: 7448
• Control / Process: RoHS Compliant
• Supply Voltage Range: 4.75V To 10V
• Rohs Compliant: Yes

TDA7448
5
Interface Protocol
The interface protocol comprises:
ACK = Acknowledge;
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.
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.
5.2 DATA BYTES
Address= 88 (HEX) (10001000): ADDR open; 8A (HEX) (10001010): connect to supply
Table 6. FUNCTION SELECTION: subaddress
B=1: INCREMENTAL BUS; ACTIVE
B=0: NO INCREMENTAL BUS
X= DON’T CARE
6/14
MSB
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))
D7
X
X
X
X
X
X
X
X
SOFTWARE SPECIFICATION
S
S
S
MSB
MSB
MSB
1
1
1
D6
X
X
X
X
X
X
X
X
0
0
0
CHIP ADDRESS
D96AU420
CHIP ADDRESS
CHIP ADDRESS
D96AU421
D96AU422
0
0
0
0
0
0
D5
X
X
X
X
X
X
X
X
1
1
1
0
S = Start;
0
0
0
0
0
LSB
LSB
LSB
D4
0
B
B
B
B
B
B
B
B
0
0
ACK
ACK
ACK
MSB
MSB
MSB
X
D3
X
X
0
0
0
0
0
0
0
0
X
P = Stop;
X
X
SUBADDRESS
X
SUBADDRESS
SUBADDRESS
X
X
B
0
1
D2
0
0
0
0
1
1
1
1
D3
D3
DATA
D2 D1 D0
D2 D1 D0
D1
LSB
A = Address;
0
0
1
1
0
0
1
1
LSB
LSB
ACK
ACK
ACK
MSB
LSB
D0
MSB
MSB
0
1
0
1
0
1
0
1
DATA 1 to DATA n
DATA 1 to DATA n
SPEAKER ATTENUATION OUT 1
SPEAKER ATTENUATION OUT 2
SPEAKER ATTENUATION OUT 3
SPEAKER ATTENUATION OUT 4
SPEAKER ATTENUATION OUT 5
SPEAKER ATTENUATION OUT 6
NOT USED”
NOT USED
B = Auto Increment
DATA
DATA
DATA
DATA
SUBADDRESS
LSB
LSB
LSB
ACK
ACK
ACK
P
P
P