How to auto power on without power key » History » Revision 3
Revision 2 (Lion Wang, 08/06/2021 05:07 PM) → Revision 3/4 (Lion Wang, 08/09/2021 05:16 PM)
h1. How to auto power on without power key 1.When system starting up, (1) R1022 and R1021 form a bias voltage to turn when turning on, so that Q1003 is turned on Q1003. 2.After (2) After 2.5 seconds, the software controls HDMI_LEVEL_EN from Low to High to turn on Q1002 and & turn Q1003 off Q1003. 3.The (3) The production line can disable be Disable auto-power on circuit by short-circuiting TP1003 and TP1004. !{width: 40%}auto_poweron.png!