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PAC2000S12-B1 PSU
10.2.2 I2C Bus Timeout
The I2C program of the PSU is reset to 0 if the PSU detects that the SCL or SDA data line is held low
for more than 300 ms.
10.3 Network Layer Protocol
10.3.1 Addressing Mode of a Slave Device
The module serves as a slave device. The address is identified by the hardware and allocated
statically. The master device accesses each slave device by addressing according to the slave device
address determined by the hardware.
10.3.2 Data Packet Verification Mode
To ensure data integrity and accuracy during communication, the PSU uses the 8-bit CRC checksum
mechanism.
The last byte of each sent and received signal is the CRC code of this signal.
●
When the master device sends data to a slave device, PEC (CRC) contains the address byte,
read/write bit, command byte, and multiple pieces of data to be sent.
●
The master device obtains data from a slave device: PEC (CRC) sent by the slave device contains
the address bytes obtained by the slave device, read/write bits, command codes, and data bytes
sent by the slave device.
10.3.3 CRC Generation Rules
The generator polynomial is x
10.3.4 Data Transmission
PMBus communication supports 10 data formats in total. All data formats adopt PEC verification.
Technical Manual
8
2
1
+ x
+ x
+ 1, and the CRC code is 100000111.
10 Communication
46
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