LPC845M301JHI33 ADC is Not Working

srchethan — Sat, 28 Nov 2020 11:59:18 GMT

Will you please help?

I am using LPC845 33 pin chip. Properly connected VREFP and VREFN
I am giving an input of 1.7V to PIO0_21(ADC_5), pin 28

When tried to initialise the ADC, first ensuring IOCON PIO0_21 is set for no-pull-up and no-pull-down
and then assigning ADC_5 through SWM, the voltage goes to 0.3V

Even if I proceed to calibrate and read, I get a low value of 0x19

I tried changing the sequence of initializing SWM and then IOCON, and this time
first I get some 1.7V but the moment the IOCON is loaded, the voltage drops.

To avoid any problem related to library, I even tried using all register addresses and bit values directly

No change in the result.

I had tried SDK 2.5 and 2.8 versions both. I need some help very much, please.

Re: LPC845M301JHI33 ADC is Not Working

Alice_Yang — Mon, 30 Nov 2020 07:48:14 GMT

Hello srchethan,

About configure ADC pins and other configurations related ADC, please first

have a look at the ADC demo under SDK, use the latest version.

Regards,

Alice

topic LPC845M301JHI33 ADC is Not Working in Processor Expert Software

LPC845M301JHI33 ADC is Not Working

Re: LPC845M301JHI33 ADC is Not Working