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PAC2000S12-B1 PSU
10.1.2 I2C Address
Addresses A2, A1, and A0 are allocated to a PSU.
PSU side:
●
A2, A1, and A0 must be pulled up to the internal voltage source through a 10-kilohm (reference
value) resistor. The voltage source must be the voltage source that supplies power to the
secondary MCU. The voltage source is supplied by the internal auxiliary power source, which is
generated by the PSU and system-side 12 V bus at the same time.
●
When power is supplied from the system side, the fuse or overcurrent/short-circuit protection
circuit must be used.
System side:
If this signal is connected to GND through a 300-ohm resistor, the address bit is 0. If this signal is
left open, the address bit is 1.
The I2C address of the PSU from high to low is A2, A1, and A0. See
Table 10-1 I2C address
PSU A2/A1/A0
0/0/0
MCU
0xB0
10.2 Data Link Layer Protocol
The link layer uses the PMBus V1.2 protocol and complies with
PMBus_Specification_Part_I_Rev_1-2_20100906 and PMBus_Specification_Part_II_Rev_1-2_20100906 .
10.2.1 Data Transmission Mode
The I2C transmission standard is used. Data transmission rate is 100 kbps. The timing definition of
lower-layer signals, such as START, STOP, R/W, ADDRESS, ACK/NACK, bus arbitration, clock
synchronization, and clock extension (except bus timeout) complies with PSMI.
the I2C data transmission mode.
Figure 10-2 I2C data transmission mode
Technical Manual
0/0/1
0/1/0
0xB2
0xB4
Table 10-1
0/1/1
1/0/0
1/0/1
0xB6
0xB8
0xBA
45
10 Communication
for details.
1/1/0
1/1/1
0xBC
0xBE
Figure 10-2
shows
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