Fortec Star CM1-BT1, Manual

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38 Module Description
3.17 FAN Interface
The module provides a system fan interface controlled by SEMA. The interface is located to the
left of the COM3 header and consists of a Hirose DF13-4, 1.25 mm pitch 1*4 header.
3.18 Battery Interface
The battery interface provides connection for an external battery to backup the RTC (real time
clock). The interface is located next to the SATA1 connector and consists of an SMP
, W125-0210-
310-Z
, 1.25 mm pitch 1*2 header.
Table 3-19: Fan Signal Definitions (CN27)
Pin Signal Connector
1 Speed (PWM out, 5V, 2k2 pull
up included)
2 Tacho (pull up 10k to3.3V
included)
3 GND
4 +V5P0S (default)
+V12P0ATX (on request)
The RTC has an expected current draw of 6

A at room temperature, with +3.0V. The
battery is used only when power is not applied to the board.
Table 3-20: Battery Signal Definitions (BAT1)
Pin Signal Connector
1 V_BATT
2 GND
FAN
1
BAT1
1