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AN2452 Datasheet(PDF) 4 Page - STMicroelectronics

Part # AN2452
Description  STW8110x evaluation board and graphical user interface
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2452 Datasheet(HTML) 4 Page - STMicroelectronics

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Figure 1.
Main form
6.
Swallow counter A: 5-bit counter.
7.
VCO calibrator:
–
Last calibration Fvco: contains the last calibration data (VCO and frequency of
calibration).
–
Calibrator ON/OFF.
–
The maximum allowed Fpfd during calibration is 1 MHz. If Fpfd > 1 MHz, the device
is programmed in two steps:
a) Device is programmed forcing calibration with the maximum Fpfd ≤1MHz
(Fpfd = Fref / R ≤1 MHz ==> R ≥ Fref / 10
6).
b) Device is programmed with the desired Fpfd.
Example with Fref = 76.8 MHz:
Desired values:
- Fpfd = 1200 kHz
- R = Fref / Fpfd = 64
Forced values:
- R' =
⎡Fref / 106⎤ = ⎡76.8⎤ = 77
- F'pfd = Fref / R' = 997.403 kHz
Device programming in two steps:
a) Device is programmed with Fpfd = 997.403 kHz and Calibrator ON.
b) Device is programmed with Fpfd = 1200 kHz and Calibrator OFF.
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