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Fan Connectors
The S2895 uses the standard 4-wire cooling fan connector pin-out. The
connector is keyed to prevent damage to the mainboard and fan due to
misalignment during insertion. Fans are 12V nominally rated with fan speed
modulated by the control signal. The Sense signal is a fan tachometer output
signal with two pulses per revolution. The Control signal is a 25KHz Pulse Width
Modulated (PWM) signal from the baseboard control circuitry.
The 4-wire fan is forward and backward compatible to the 3-wire fan. This
means an older 3-wire fan will plug into a 4-wire fan header. However, there is
no speed control for a wire fan. It will always run at full RPM
1 2 3 4
©©©©
Pin1=GROUND
Pin2= +12v
Pin3= Tachometer
Pin4= Speed Control
Hardware Monitor
Temperature senor
Senor chip: LM95221 (SMB address: 010 1011x)
CPU1 temperature: U92 pin1, 2
CPU2 temperature: U92 pin3, 4
FAN speed detect and control
CPU1 FAN
CPU2 FAN
FAN 1
FAN 2
FAN 3
FAN 4
Use these headers to connect the processor or
chassis cooling fan to your motherboard to keep the
system stable and reliable.
* For 3-pin fans connect to pin 1-3.
CPU1 FAN PWM: SIO PIN34 GP11
CPU1 FAN TACH: SIO PIN7 GP85
CPU2 FAN PWM: SIO PIN43 GP22
CPU2 FAN TACH: SIO PIN110 FAN_TACH4
FAN1 PWM: CK804 PINAB4 FANCTL1
FAN1 TACH: CK804 PINAA3 FANRPM
FAN2 PWM: SIO PIN104 GP74
FAN2 TACH: SIO PIN35 FAN_TACH2
FAN3 PWM: SIO PIN104 GP74
FAN3 TACH: SIO PIN103 FAN TACH3
FAN4 PWM: CK804 PINAA2 FANCTL0
FAN4 TACH: CK804 PINAA3 FANRPM
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