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Application Notes/
Technical Brief
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AN512
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Title:
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Implementing Ohmmeter/Temperature Sensor
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Name:
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AN512
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Date:
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8/26/97
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Author:
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Doug Cox
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Description:
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This application note describes a method forimplementing an ohmmeter or resistance type temperature sensor using the PIC16C5X series of
microcontrollers. The ohmmeter requires only two external components and is software and hardware configurable for resistance measurement with resolutions from 6-bits to 10-bits with measurement times of 250 ms (6-bits at 8 MHz) or longer. This method uses a software calibration technique that compensates for voltage, time, and temperature drift as well as component errors. PIC16C5X microcontrollers are ideal for simple analog applications because: ? Very low cost ? Few external components required ? Fully programmable. PIC16C5X Microcontrollers are offered as One Time Programmable (OTP) EPROM devices. ? Available off the shelf from distributors ? Calibration in software for improved measurement accuracy ? Power savings using PIC16C5X?s Sleep mode. ? PIC16C5X?s output pins have large, current source/sink capability to drive LED?s directly.
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Keywords:
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PIC16C5X, Temperature Sensor, Ohmmeter
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