topic Re: LPCXpresso802 Power saving mode in LPC Microcontrollers

LPCXpresso802 Power saving mode

Babycat — Fri, 26 Mar 2021 09:48:58 GMT

Hello everyone,

May I check with you guy if there is anyone tested power saving mode with LPCXpresso802 kit?
I ran project "lpcxpresso802_power_mode_switch_lpc" and I got 4 options:

1. Sleep mode
2. Deep Sleep mode
3. Power Down mode
4. Deep power down mode

It surprised me that mode 4 (Deep power down mode) the consumption current is about 1mA which I think it is too much. I have measured on JP1 pins (3V3 source)
Any one please help to confirm?
I intend to use LPC802 for remote control, but 1mA is too much

Regards.

Re: LPCXpresso802 Power saving mode

frank_m — Fri, 26 Mar 2021 09:59:09 GMT

According to the user manual, JP7 is in the line between the user LEDs and VDD.

You would want JP1, which seems to be for such measurements.

However, I would check the schematics what current you measure in this case. Supply current for other, non-relevant parts might affect your measurement. I can't source the schematics on the fly ...

Re: LPCXpresso802 Power saving mode

Babycat — Fri, 26 Mar 2021 10:05:15 GMT

Hi Meyer

I have attached the schematic hereby,

My VOM is between 2 pins of JP1, so only MCU current should flow through it.

Please have a check the attached schematic

Regards,

Re: LPCXpresso802 Power saving mode

ZhangJennie — Mon, 29 Mar 2021 04:11:36 GMT

Hi Babycat

In addition, please make sure you DISCONNECT the board with IDE debugger when measure.

In default demo code, you need to select option 4 on hyper terminal to enter Deep power down mode. Try to revise the code to let LPC804 automatically go into deep lower down without remote control at the beginning code the main code.

download, power off and power on, Let the board run in standalone mode ( disconnect PC debugger)

Measure current again. You should be able to see consumption current down.

Have a nice day,

Jun Zhang