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AN4494 датащи(PDF) 18 Page - STMicroelectronics

номер детали AN4494
подробное описание детали  Bringing up the BlueNRG and BlueNRG-MS devices
PDF  34 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4494 датащи(HTML) 18 Page - STMicroelectronics

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IFR configuration
AN4494
4.6
Expected results
The measured value must be compensated in order to consider the variations of the power
supply, temperature and the crystal tolerance:
XTAL_startup = XTAL_startup(measured)*1.2*1.1*1.2 = 1.584* XTAL_startup (measured)
The first coefficient (1.2) can be omitted if the test is performed at the minimum operative
voltage.
Finally, to find the HS_STARTUP_TIME value that must be set up in the IFR, use this
formula:
HS_STARTUP_TIME = 110 µs + MAX {XTAL_startup, (0.56*XTAL_startup+304)}
4.7
Note
Examples:
XTAL_startup = 300 µs → HS_STARTUP_TIME = 680 µs
XTAL_startup = 700 µs → HS_STARTUP_TIME = 1219 µs
4.8
Other
N/A.
18/34
DocID026361 Rev 3



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