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12048231 Rev. 00 (Draft)
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4.25. System-Fan Connectors
Reference Designator:
– J9, J10, J11, J12
2.54mm Pitch wire-to-board vertical header, with friction lock, 4 Circuits
Description
The eDM-CB-SM-IPCS provides four system fan connectors for thermal regulation.
TACHIN[0..3]: each of TACHIN signals is separately connected to the board controller. The board controller
observing the rotation speed and forwarding the middle value of the all four TACHIN signal to the SMARC
module.
PWM[0..3]: the SMARC PWM signal from module is 1:1 forwarded to each system fan. The rotation speed
must be approximately equal if the same type of the system fan is used in design.
Interfaces used
FAN_PWMx output signal from the STM32 board controller
FAN_TACHINx input signal to the STM32 board controller
Connector drawing and contact-numbering scheme
Figure 34 Connector
– J9, J10, J11, J12
Pinout
J9
J10
J11
J12
Pin
Signal / Function
Pin Type
Signal Description
1
Ground
GND
Fan ground
2
V_12V0_S0_FAN
Power
12V fan power supply, max. current 150mA for each FAN
3
FAN_TACHIN0x
I (1.8V - 5V)
Input for rotation counter
4
FAN_PWMx output signal
O (5V)
PWM for fan-speed control (optional 3.3V)