Analog Comparator - Freescale
Analog Comparator - Freescale
Analog Comparator - Freescale
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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 />
<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. 27<br />
ChargeUpTime<br />
TimerResolution =<br />
2<br />
ChargeUpTime chosen to be 1ms<br />
n=8 for 8-bit timer (MTIM)<br />
TimerResolution is 3.9us (round to 4us)<br />
Max timer overflow = 255*4us= 1.02ms<br />
n –1<br />
TM
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