Analog Comparator - Freescale
Analog Comparator - Freescale
Analog Comparator - Freescale
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Implementation<br />
Emulated ADC Example using <strong>Analog</strong> <strong>Comparator</strong><br />
►Define sampling time and timer<br />
resolution<br />
►Define RC time constant<br />
►Construct lookup table<br />
►Define bus frequency<br />
►Calibration<br />
Step =<br />
Code =<br />
VDD<br />
255<br />
ADCin –<br />
<strong>Freescale</strong> and the <strong>Freescale</strong> logo are trademarks of <strong>Freescale</strong> Semiconductor, Inc. All other product or service names are<br />
the property of their respective owners. © <strong>Freescale</strong> Semiconductor, Inc. 2007-2008. 29<br />
Step<br />
Step<br />
2<br />
+ 1 ; ADCin ≥<br />
0 ; ADCin <<br />
Non-Linearity Compensation Lookup Table<br />
Step<br />
Step<br />
Time (us) ADC In Timer Count Linear ADC<br />
Code<br />
0 0 0 0<br />
4 0.09 1 5<br />
8 0.18 2 10<br />
12 0.26 3 14<br />
16 0.35 4 18<br />
| | | |<br />
1016 4.95 254 253<br />
1020 4.95 255 253<br />
2<br />
2<br />
TM
Change language