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Added PWM fan schematic

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Aditya Prayoga 2020-03-16 13:11:25 +07:00
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docs/helios64/fan.md
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## PWM Fan
## PWM Introduction
Please kindly review the [pwm pages](/helios4/pwm) from the Helios4 device.
Basically the PWM mechanisms of Helios64 board is same with Helios4.
Basically the PWM mechanism of Helios64 board is same with Helios4.
---TBU---
## Fan Control Schematic
### Fan Specification in Helios64
![!Fan Control Schematic](img/fan/fan_control_schematic.png)
**Remarks**
| Description | Header P7 | Header P6 | Remarks |
|-----------|---------|-----------|---------|
| PWM pin | PWM0 | PWM1 | 5V tolerant |
| SENSE pin | GPIO4_C5 | GPIO4_C7 | no kernel module/userspace apps that make use of this pin yet |
| PWM Frequency | 25 kHz | 25 kHz | defined in device tree |
## Fan Specification in Helios64
Coming Soon.
### Use Case in Linux
## Use Case in Linux
Coming Soon.

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