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Signal Descriptions and Connector/Pin Assignments
Signal
I
2
C Serial Clock
I
2
C Serial Data
Address 1
Address 0
DC Return (ground)
CAN HIGH
CAN LOW
-RS
+RS
PF/PG
RE
12V Auxiliary
(12VAUX) / FAN
Controlled Output
5VSB
Tachometer Input
Table 3 Signal Descriptions and Connector/Pin Assignments
706679 Rev 09-26-18
Description/Remarks
Provides PMBus control/status interface. Pulled-up to 3.3V by a
4.7K resistor. Maximum frequency is 100Khz.
Provides PMBus control/status interface. Pulled-up to 3.3V by a
4.7K resistor.
High-true address selection input (2 bits: 0, 1).
High-true address selection input (2 bits: 0, 1).
XL270 circuit return for all outputs and status/control signals. (RTN)
HIGH data line for CAN (Controller area Network)
communications (for current sharing and service use)
LOW data line for CAN (Controller area Network)
communications (for current sharing and service use)
Remote sense for RTN
Remote sense for VOUT (compensates for load-cable drop)
A high-logic level (≈4.5V) indicates the output power is in
regulation for at least the next 2ms.
Remote Enable Input
Provides 0.5A at 12V. Uses RTN for its return.
With the PMBUS command, this output can switch on and off with
a preprogrammed duty cycle to control fan speed.
Provides 1A at 5V. Uses RTN for its return.
The tachometer output of a single fan may be connected to this
input. The loss of the tachometer signal is detected and can be
reported over the optional serial data interface.
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