How to auto power on without power key » History » Version 4
Lion Wang, 11/11/2021 02:53 PM
| 1 | 1 | Lion Wang | h1. How to auto power on without power key |
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| 3 | 3 | Lion Wang | 1.When system starting up, R1022 and R1021 form a bias voltage to turn on Q1003. |
| 4 | 4 | Lion Wang | 2.After 2.5 seconds, the software controls HDMI_LEVEL_EN(GPIO) from Low to High to turn on Q1002 and turn off Q1003. |
| 5 | 3 | Lion Wang | 3.The production line can disable auto-power on circuit by short-circuiting TP1003 and TP1004. |
| 6 | 1 | Lion Wang | |
| 7 | 2 | Lion Wang | !{width: 40%}auto_poweron.png! |