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TDA7803A-QLX Datasheet(PDF) 43 Page - STMicroelectronics

Part # TDA7803A-QLX
Description  High efficiency digital input automotive quad power amplifier with built-in diagnostics features, start stop compatible
PDF  72 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7803A-QLX Datasheet(HTML) 43 Page - STMicroelectronics

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DS12195 Rev 7
43/72
TDA7803A
I2C bus interface
71
9
I2C bus interface
Data transmission from microprocessor to the TDA7803A and viceversa takes place
through the 2 wires I2C bus interface, consisting of the two lines SDA and SCL (pull-up
resistors to positive supply voltage must be connected).
When I2C bus is active, the user can select the IC's operating mode. The diagnostic cycle
results are stored into the data byte, and read the instruction and data bytes back.
The protocol used for the bus is depicted in Figure 44 and 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)
Figure 44. I2C bus protocol description
Description:
S = Start
R/W = '0' => Receive-Mode (Chip could be programmed by uP)
I = Auto increment; when 1, the address is automatically incremented for each byte
transferred
A = Acknowledge
P = Stop
MAX CLOCK SPEED 400kbit/sec
There are four I2C addresses (for PowerSO36 package): 1101100, 1101101, 1101110, 1101111.
For Flexiwatt package only the 1101100 is available.
S
A
A
P
=
1
1
0
1
1
I
=
=
GAPG1504160751PS
Data
Subaddress
Address
DATA
Address
DATA
SUBA6
DATA
SUBA5
DATA
SUBA4
Subaddress
DATA
SUBA3
DATA
SUBA2
ADD2
Data
DATA
SUBA1
ADD1
DATA
SUBA0
R/W



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