nRF51822 ADC battery level detection example question

RE: nRF51822 ADC battery level detection example question

hawk — Thu, 21 Jan 2016 08:30:43 GMT

if vdd is used， vdd_test ＊ 1/3 ＝ vbg * result_value/ 255, vdd_test=1.2v *( result_value/255) *3, so i read result_value in order to monitor/caculate the vdd_test value?

RE: nRF51822 ADC battery level detection example question

hawk — Thu, 21 Jan 2016 08:16:35 GMT

if vdd is used， vdd_test ＊ 1/3 ＝ vbg * result_value/ 255, vdd_test=1.2v *( result_value/255) *3,

so i read result_value in order to monitor the vdd_test value?

RE: nRF51822 ADC battery level detection example question

Sam Wei Quan — Thu, 27 Jun 2013 08:03:10 GMT

Thank for the fast reply :)

RE: nRF51822 ADC battery level detection example question

Ole Morten — Thu, 27 Jun 2013 07:49:07 GMT

As you can see, the INPSEL field is set to be the supply. If you take a look at the description of the CONFIG register in the reference manual, you can see that the PSEL field is used only if the INPSEL is set to one of the fields where the description says it will be used. For both the Supply values, the VDD is used as an input, and the PSEL field is not used.