topic Re: LPC55S69 : wakeup ADC for temperature measurement in LPC Microcontrollers

LPC55S69 : wakeup ADC for temperature measurement

EugeneHiihtaja — Tue, 10 Mar 2020 09:47:24 GMT

Hi !

Temperature measurement in SDk example wakeup only 2 components in PMC:

/* Disable LDOGPADC power down */
POWER_DisablePD(kPDRUNCFG_PD_LDOGPADC);
/* Disable Temperature sensor power down. */
POWER_DisablePD(kPDRUNCFG_PD_TEMPSENS);

Can it be so that we need one more line :

POWER_DisablePD(kPDRUNCFG_PD_GPADC);

Could you suggest right domains for temperature measurement only ?

I should measure temperature only few times per minute and would like to conserve energy as well.

What I should disable for be sure if all components what are involved in temperature measurements are not consume nothing. Or for better stability of temperature sensor I should keep it always ON ?

From other side I have PowerDown mode on sometines and during this mode, almost everything is powerd off automatically.

I assume, I can disable temp sensor all the time and enable it only for few ms when temperature result is really need.

Regards,

Eugene

Re: LPC55S69 : wakeup ADC for temperature measurement

xiangjun_rong — Fri, 13 Mar 2020 12:01:40 GMT

Hi, Eugene,

This is the components power down setting register.

But the temperature senor power down bit is reserved in the UM11126.pdf.

I think you should not power down the temperature sensor if you use it, because the temperature takes time to have the have temperature voltage stable.

XiangJun Rong

Re: LPC55S69 : wakeup ADC for temperature measurement

EugeneHiihtaja — Fri, 13 Mar 2020 12:19:20 GMT

Hi xiangjun.rong‌ !

So I shouldn't powerdown temperature sensor, but I can powerdown ADC and LDO ADC.

Is this so ?

Regards.

Eugene

Re: LPC55S69 : wakeup ADC for temperature measurement

xiangjun_rong — Fri, 13 Mar 2020 12:24:05 GMT

Hi, Eugene,

Yes, You shouldn't powerdown temperature sensor, but you can powerdown ADC and LDO ADC.

XiangJun Rong