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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.
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