topic Re: [LPC802] Periodic peak current during LOW power down in LPC Microcontrollers

[LPC802] Periodic peak current during LOW power down

emmanuelJJ — Tue, 13 Sep 2022 15:16:29 GMT

Hi All,

I have configured my LPC802 as following before entering in power down mode

- FRO set to 9MHz and set as main clock

- LPOSC_PD is powered and BOD_PD is powered down in PDSLEEPCFG

- Only ACMP is powered down in PDRUNCFG and PDAWAKECFG

- All interrupts wake-up are disabled ==> STARTERP1 and STARTERP0 have the reset value

- All the peripheral clock are disable in SYSAHBCLKCTRL. Except for SYS, ROM, RAM0, Flash

- WKT and WDT clock are disabled in LPOSCCLKEN

- PM set to 0x2

- Write one to the SLEEPDEEP bit in the Arm Cortex-M0+ SCR register

- Use the Arm WFI instruction

With all this configuration, I have a periodic peak current of 5mA each 30ms when watching Power Measurement window.

It looks like something is running in back ground.

Any idea?

Thank a lot for your support.

Best regards,

Emmanuel

Alice_Yang — Wed, 14 Sep 2022 02:55:46 GMT

Hello,

How about run the power_mode_switch_lpc demo under SDK, does it also have periodic peak current of 5mA each 30ms ?

And what is wake-up source in your project?

Alice

emmanuelJJ — Wed, 14 Sep 2022 14:35:22 GMT

Hi Alice,

1) I don't test demo under SDK.

2) There isn't wake-up source. Everything are disable

Best regards

Emmanuel

Alice_Yang — Mon, 19 Sep 2022 09:01:58 GMT

Hello emmanuelJJ,

Sorry just from your first description it hard to identify the problem.

Alice