topic Re: LPC812 can not work at 1.8V in LPC Microcontrollers

LPC812 can not work at 1.8V

wwz — Thu, 15 Jun 2023 07:12:27 GMT

hello everyone,

According to the user manual, lpc812 can work at 1.8v-3.6v, but the test results of my side will not work when the voltage is lower than 2.6v, and the BOD function is also disabled. Do I need any special Settings if I want to use 1.8v?

thanks

Re: LPC812 can not work at 1.8V

xiangjun_rong — Thu, 15 Jun 2023 09:15:12 GMT

Hi,

Can you give us more information for example, how do you know that the LPC812 does not work when the VDD is 2.6V?

Pls use the LED blinky example in SDK and impress 2.6V to the VDD, does the LED still toggle?

If the BOD is disabled, I do not think there is special configuration if you use low voltage VDD.

In 2.6V, if you press Reset, can the board work?

XiangJun Rong

Re: LPC812 can not work at 1.8V

wwz — Thu, 15 Jun 2023 09:46:00 GMT

Hi,

Thanks for the quick response, i have found the problem, it is caused by an external reset chip.but i have another quesiton: for the BOD reset level 0, LPC812 has no description of reset level 0 ,but LPC824 has the description of reset levle 0，Is it the same as LPC824?

thanks & best regards！

Re: LPC812 can not work at 1.8V

xiangjun_rong — Fri, 16 Jun 2023 02:15:35 GMT

Hi,

I suppose that there is not reset level 0 for both LPC82x and LPC81x, there are Reset level 1,2,3, which corresponds to different Reset threshold voltage.

For LPC81x:

The corresponding threshold voltage for LPC81x is defined in data sheet of LPC81x:

Hope it can help you

XiangJun Rong

Re: LPC812 can not work at 1.8V

wwz — Fri, 16 Jun 2023 04:01:09 GMT

Hi,

OK,

thanks