ADC Channel number pin assign

RE: ADC Channel number pin assign

hanmanthm — Fri, 27 Apr 2018 09:25:55 GMT

nagarajcan you please tell me how to configure and read the ADC channel(Example ADXl335)

RE: ADC Channel number pin assign

haakonsh — Wed, 28 Feb 2018 09:08:26 GMT

You have to ask Laird, or test each AIN pin for yourself.

RE: ADC Channel number pin assign

nagaraj — Wed, 28 Feb 2018 06:28:44 GMT

Hi Haakonsh,

I have already worked on the nRF51822 ADC (On PCA 10004 board) and I know how to configure and read the ADC channel. Thanks for the SAADC example, but in the BL600 module the manufacturer has not mentioned the ADC channel no for the pin 2,4,5,6,7,8 and 9th in the module. Now to read the ADC value first I need to configure the ADC channel, in this case I don't know the module pin 2 is connected to which ADC channel on the nRF51822 IC. I would like to know the module pin vs nRF51822 pin connection for configuring ADC channel.

Thanks,

Nagaraj

RE: ADC Channel number pin assign

haakonsh — Tue, 27 Feb 2018 15:04:53 GMT

Hey nagaraj,

A channel has two inputs, one 'positive' and one 'negative'. In single ended mode the negative input is 'disconnected', this means that it is connected to ground. The positive input can be connected to any given analog input pin.
In differential mode the positive and negative inputs are connected to any given analog input pin.
In short the analog input pins are multiplexed.

See the SAADC documentation and SAADC HAL and driver API reference, as well as the SAADC Example.

Cheers,

Håkon.