MM9Z1_638, Voltage measurement by Vsense0 input

[Boris_Bloxsberg]

Hi,

I want to measure a temperature by a voltage divider and the VSENSE0 input but I´m not sure about the supply voltage of the voltage divider. 

My questions are:

- Is the vsense0 input an "absolute" input? 

- Is the vsens0 an "relative" input and what is the reference voltage?

I just found the following picture in the manual (page ), but no Vref value.

Regards

[Boris_Bloxsberg]

Dear Tomas,

thanks for the reply. I know for the PTBX inputs I don´t need to know the supply voltage, because the input voltage is supplied/generated by vdda (relative input). The questions is, what suppy voltage could I use for the Vsense0 input with a input range of 0 to 10Volts. Do you mean it doesnot matter because its an absolut input?

regards

[TomasVaverka]

Hi,

Best regards,

Tomas

[TomasVaverka · Accepted solution]

Hi,

There is no need to know the Vref value of VSENSE.

The measured selected (based on VSSEL and VSEx bits of the GPIO_VSENSE register) voltage can be calculated as follows:

1. VSENSEx: V = ACQ_VOLT[15:0] x VSxRO

2. PTBx: V = ACQ_VOLT[15:0] x PTB0-4VRES

Best regards,

Tomas