參數(shù)資料
型號(hào)： TDA7405TR
廠商： STMICROELECTRONICS
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP44
封裝： 10 X 10 MM, ROHS COMPLIANT, TQFP-44
文件頁(yè)數(shù)： 33/58頁(yè)
文件大?。?/td> 762K
代理商： TDA7405TR
39/57
TDA7405
12
IC BUS INTERFACE
12.1 Interface Protocol
The interface protocol comprises:
-a start condition (S)
-a chip address byte (the LSB bit determines read / write transmission)
-a subaddress byte
-a sequence of data (N-bytes + acknowledge)
-a stop condition (P)
S = Start
R/W ="0" -> Receive-Mode (Chip could be programmed by P)
"1" -> Transmission-Mode (Data could be received by P)
ACK = Acknowledge
P = Stop
MAX CLOCK SPEED 500kbits/s
12.1.1Auto increment
If bit I in the subaddress byte is set to "1", the autoincrement of the subaddress is enabled.
12.1.2TRANSMITTED DATA (send mode)
SM = Soft mute activated
ST = Stereo
P = Pause
X = Not Used
The transmitted data is automatically updated after each ACK. Transmission can be repeated without new chi-
paddress.
12.1.3Reset Condition
A Power-On-Reset is invoked if the Supply-Voltage is below than 3.5V. After that the following data is written
automatically into the registers of all subaddresses :
The programming after POR is marked bold-face / underlined in the programming tables.
With this programming all the outputs are muted to VREF (VOUT= VDD/2).
CHIP ADDRESS
SUBADDRESS
DATA 1 ... DATA n
MSB
LSB
MSB
LSB
MSB
LSB
S 1 0 0 0 1 1 0 R/W ACK
C AZ
I
AA
AAA
ACK
DATA
ACK
P
MSB
LSB
XX
X
P
ST
SM
MSB
LSB
11
1
0
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