PFS122 datasheet(39/93 Pages) PADAUK

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39 / 93 page

PFS122

8bit MTP MCU with 12-bit R-Type ADC

Page 39 of 93

PDK-DS-PFS122-EN_V000-May 28, 2020

5.5.3

Using the comparator and bandgap 1.20V

The internal bandgap module can provide 1.20 volt, it can measure the external supply voltage level. The

bandgap 1.20 volt is selected as minus input of comparator and Vinternal R is selected as plus input. The

supply voltage of Vinternal R is VDD, and the VDD voltage level can be detected by adjusting the voltage level

of Vinternal R to compare with bandgap. If N (gpcs[3:0] in decimal) is the number to let Vinternal R closest to

bandgap 1.20 volt, the supply voltage VDD can be calculated by using the following equations:

For using Case 1: VDD = [ 32 / (N+9) ] * 1.20 volt ;

For using Case 2: VDD = [ 24 / (N+1) ] * 1.20 volt ;

For using Case 3: VDD = [ 40 / (N+9) ] * 1.20 volt ;

For using Case 4: VDD = [ 32 / (N+1) ] * 1.20 volt ;

Case 1:

$ GPCS VDD*12/40;

4.0V * 12/40 = 1.2V

$ GPCC Enable, BANDGAP, P_R;

- input: BANDGAP, + input: P_R(

Vinternal R)

….

(GPC

_Out)

// or GPCC.6

{

when VDD﹥4V

}

else

{

when VDD﹤4V

}

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