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AN2678 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN2678
Description  Extremely accurate timekeeping over
PDF  16 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2678 Datasheet(HTML) 6 Page - STMicroelectronics

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M41T82-83-93 series RTCs
AN2678
6/16
1.5
Determining the error
The error formula, in ppm, where fm is the measured frequency, is below. When using a
frequency counter, this can be used to determine the error.
The formula below can be used to determine the error when using the microprocessor timer
to determine the period, T512, of the frequency test signal.
Equation 1
A negative ppm means the frequency is too low and the clock is slow. Conversely, a positive
ppm means the clock is fast and thus needs to be slowed down.
6
m
10
512
512
f
ppm
×
−
=
6
512
512
10
Τ
Τ
512
1
ppm
×
−
=



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