The Shutdown Current is Fluctuating [shutdown的电流是波动的 ]

[YUNLEI]

Hi,

The chip I am using is STM32WB55RGV6. I put it into shutdown mode and tested its current. I am using instrument room N6705C for power supply, with a voltage set to 3.3V for testing. The test result is an average current chamber of a few nA, but the waveform of the current is fluctuating, and the maximum current will look like 5uA. Is this normal?What should the current waveform look like in a normal shutdown mode？

It can be confirmed that there are basically no external connections to the IO port, and they are all configured in analog mode. I am using an inductor of 2.2uH.

Thanks.

你好，

我是用的芯片是STM32WB55RGV6，我让它进入shutdown模式并且测试了它的的电流。我是用的仪器室N6705C，使用它供电，电压设置为3.3V测试。测试结果就是平均的电流室几nA，但是电流的波形是跳动的，最大电流会有5uA样子，这是正常的吗？正常的shutdown模式的电流波形应该是什么样子的呢？

可以确定的是IO口基本没有外部的连接，都配置成了模拟状态，我是用的电感是2.2uH。

[STTwo-32 · Accepted solution]

Hello @YUNLEI 

I think this is due to the noise coming from the power supplier. 

Bets Regards.

STTwo-32

[YUNLEI]

Hi,

Thans for you reply,

I'm sorry, I just accidentally clicked the resolved button.

You think is the noise which is form the power supplier, can you provide a specific introduction.I have tested the nucleu board MB1355D which has this issue also.

Thanks

[STTwo-32]

Hello @YUNLEI 

Could you try using a power supply with a very reduced Noise. I think that should solve the issue.

Best Regards.

STTwo-32 

[YUNLEI]

Hi,

I will have a try,

Thanks for you reply.