SBC WakeUp

[shiqi_seventeen]

A one-time write can turn off the power, but the current issue with wakeup is that it cannot wake up the SBC. Before turning off the LDO power supply, I set up a wakeup source, but the test was unsuccessful.

There are two questions to solve:

1.Are there any prerequisites for setting up a wakeup source?

2.What wake-up source does the low-power mode SBC default to by default?

[guoweisun]

Which part do you mean? please give the full part number here.

[shiqi_seventeen]

The current situation is that as long as I enable the configuration of M_ WIO_ The wake1 wake-up source (high-level wake-up) in CFG (0x10) cannot turn off the power supply of SBC even after SPI configuration enters LPOFF mode.

[guoweisun]

现在的问题是SBC 在LPOFF mode下也不能OFF掉LDO1,LDO2？

如果是这样的话，你能确定SBC的工作状态吗？

[shiqi_seventeen]

是的，已经进入了lpoff模式了

[shiqi_seventeen]

我已经确保了wake1 是低电平的情况下，才进入LPOFF模式

[guoweisun]

VPRE还有电平吗？因为我怀疑您进去了standby模式而不是LPOFF 模式，参考下面进入LPOFF步骤：

The LPOFF mode is intended to place the system in a fully OFF state with no system
supplies active. Logic circuitry is supplied internally to allow proper wake up from any of
the available wake-up mechanisms, with the minimum current consumption possible.
To enter LPOFF some conditions and commands are required. You can send a SPI
request to go to LPOFF mode from INIT_FS or during Normal mode. Two commands
must be sent, the second command (FS go LPOFF) must be sent within 10ms after the
first command (PRE LPOFF) is sent.
Write the below commands to FS_LP_REQ[7:0]
1. 0xA5 --> transition to PRE LPOFF
2. 0x5A --> Transition to FS go LPOFF
Before sending the request, you must select the way to wake up from LPOFF mode:
The wake up signals must be enabled through the register showed in the previous figure.
The wake up pins can detect HIGH/LOW levels and rising/falling edges.

[shiqi_seventeen]

I am using FS2633