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3.3.14 FAN Connectors
4-Wire FAN Connector
CN33
Pin
Signal
1
GND
2
FAN_POWER
3
FAN_TACHO_IN
4
FAN_PWM
3-Wire FAN Connector
CN34
Pin
Signal
1
GND
2
FAN_POWER
3
FAN_TACHO_IN
Please refer to chapter 5.1 for considerations about thermal dissipation.
FAN_POWER: +12V
derived power rail for FAN, managed by the embedded microcontroller via PWM signal
IN
FAN_TACHO_IN: tachometric input from the fan to the embedded microcontroller, +3.3V_RUN electrical level signal with 10kΩ pull-up resistor.
FAN_PWM: PWM output from the embedded microcontroller to the FAN (4-pin connector only).
3.3.15 Recovery Switch
In some cases, a wrong configuration of BIOS parameters could lead the module in an unusable state (i.e. no video output, all USB HID devices disabled).
For these cases, on the board it has been placed a 3-way switch SW1 which can be used to restore the BIOS to factory default configuration. To do
so, it is necessary to place the contact of the switch in 1-2 position, then turn on the module, wait until the board resets itself then turn off the board.
The contact MUST be now placed back to 2-3 position.
During normal use, the contact MUST be always placed in 2-3 position.
SBC-C90
SBC-C90 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by C.M. Copyright © 2021 SECO S.p.A.
Depending on the usage model of SBC-C90, for critical applications/environments on SBC-C90 it is available a 4-pin
dedicated connector for an external +12V
The default FAN Connector is a 4-pin single line SMT connector, type HR p/n A1250WRA-S-
04PNLNG1G00R or equivalent, with pinout shown in the table on the left.
Alternatively, as a factory option, the SBC-C90 module can be equipped with a 3-pin single line SMT connector, type
MOLEX 53261-0371 or equivalent, with pinout shown in the table on the left.
Mating connector: MOLEX 51021-0300 receptacle with MOLEX 50079-8000 female crimp terminals.
Please be aware that the use of an external fan depends strongly on customer's application/installation.
FAN.
DC
38
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