LPUART consumes extra 3mA while STOP2 mode

[Charles_Li]

I'm using STM32WB55. The reference example is BLE_p2pServer with custom modifications. The power consumption of STOP2 mode ( by enabling CFG_LPM_SUPPORTED ) is around 6mA (board level), and it will be around 9mA after LPUART is enabled with RCC_LPUART1CLKSOURCE_HSI. Is that reasonable?

If (3.85+5.25)*64 is the correct extra current consumption of LPUART in STOP mode?

 

[Sarra.S]

Hello @Charles_Li,

The calculated extra current is in the range of 0.576mA, yes, which is significantly lower than the observed increase of 3mA. Is there any other active peripherals? 

This application note is however worth checking: How to optimize LPUART power consumption on STM32 MCUs