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PFS154 Datasheet(PDF) 47 Page - PADAUK Technology.

Part # PFS154
Description  8bit MTP Type IO controller
PDF  91 Pages
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Manufacturer  PADAUK [PADAUK Technology.]
Direct Link  http://www.padauk.com.tw/
Logo PADAUK - PADAUK Technology.

PFS154 Datasheet(HTML) 47 Page - PADAUK Technology.

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PFS154
8bit MTP Type IO Controller
©Copyright 2020, PADAUK Technology Co. Ltd
Page 47 of 91
PDK-DS-PFS154_CN_V105 –Jun. 9, 2020
5.12.3 Using the comparator and band-gap 1.20V
The internal band-gap module provides a stable 1.20V output, and it can be used to measure the external
supply voltage level. The band-gap 1.20V is selected as minus input of comparator and Vinternal R is selected
as plus input, the supply voltage of Vinternal R is VDD, the VDD voltage level can be detected by adjusting the
voltage level of Vinternal R to compare with band-gap. If N (gpcs[3:0] in decimal) is the number to let Vinternal R
closest to band-gap 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)
….
if
(GPC_Out)
// or GPCC.6
{
// when VDD﹥4V
}
else
{
// when VDD﹤4V
}



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