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TB004

Title
Title
Automatic Calibration of the WDT Time-out Period
Name
Name
TB004
Date
Date
06/24/2015
Application Categories
Application Categories
Algorithms (Building Blocks) / Calibration
Peripheral / 8 16 Timer
Product Categories
Product Categories
8-bit MCU
Description
Description
The WDT timer is a simple RC timer with a typical time-out period of about 18 ms. This time-out period is dependent on Voltage, Temperature and Silicon process variations. Hence the tolerance on the time-out period is very wide: Min. of 9 ms to a Max. of 33 ms (please refer to appropriate datasheet for device dependent value). There are applications where an additional timer would be useful as an approximate time keeper, hence getting a more precise value of the WDT time-out is useful. This Tech Brief implements an automatic calibration of the WDT time-out period on start-up.