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User Manual
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V 1.0
2021-08-25
XDPP1100 technical reference manual
Digital power controller
Fan support
13.4
Fan PMBus commands
Table 84
Fan PMBus commands
Peripheral
Field name
Access
Address
Bits
Description
FAN_CONFIG_1_2
RW
Byte
3Ah
[7]
FAN1 enable.
0: FAN1 disabled
1: FAN1 enabled
[6]
FAN1 control mode select. Not
supported by default FW patch. Set
to 0 for correct functioning of
FAN_COMMAND_1 when in duty-
cycle mode as selected by register
fan_mode.
[5:4]
FAN1 tachometer pulses per
revolution (ppr).
0: 1 ppr
1: 2 ppr
2: 3 ppr
3: 4 ppr
[3]
FAN2 enable.
0: FAN2 disabled
1: FAN2 enabled
[2]
FAN2 control mode select. Not
supported by default FW patch. Set
to 0 for correct functioning of
FAN_COMMAND_2 when in duty-
cycle mode as selected by register
fan_mode.
[1:0]
FAN2 tachometer pulses per
revolution (ppr).
0: 1 ppr
1: 2 ppr
2: 3 ppr
3: 4 ppr
FAN_COMMAND_1 RW
Word
3Bh
[15:0]
FAN1 fractional duty cycle when in
duty-cycle mode as selected by
register fan_mode. Format is
LINEAR11 with exponent of -8
recommended.
C000h = 0/256 = 0.0 percent
C001h = 1/256 = 0.390625 percent
C002h = 2/256 = 0.78125 percent
…
C0FEh = 254/256 = 99.21875 percent
C0FFh = 256/256 = 100 percent
(note FFh case overrides to 100
percent duty)
FAN_COMMAND_2 RW
Word
3Ch
[15:0]
FAN2 fractional duty cycle when in
duty-cycle mode as selected by