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TDA7808 bảng dữ liệu(PDF) 26 Page - STMicroelectronics

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TDA7808 bảng dữ liệu(HTML) 26 Page - STMicroelectronics

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I2C bus interface
TDA7808
26/39
DS12230 Rev 4
9
I2C bus interface
Data transmission from microprocessor to the TDA7808 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 protocol used for the bus is depicted in Figure 31 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 31. 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 1101111 is available.



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