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NRF7002-QFAA-R Fiches technique(PDF) 13 Page - Nordic Semiconductor

No de pièce NRF7002-QFAA-R
Description  nRF7002
PDF  61 Pages
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Fabricant  NORDIC [Nordic Semiconductor]
Site Internet  https://www.nordicsemi.com/
Logo NORDIC - Nordic Semiconductor

NRF7002-QFAA-R Fiches technique(HTML) 13 Page - Nordic Semiconductor

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Power and clock management
over temperature. The crystal tolerance (that is, accuracy at room temperature) is less important since this
will be trimmed out by the crystal oscillator trim function (up to ± 20 ppm). The crystal oscillator/crystal is
typically trimmed by transmitting Wi-Fi packets through the antenna connector and using a Vector Signal
Analyzer (VSA) to measure the frequency offset. Alternatively, a generic spectrum analyser can be used to
measure the frequency offset on a transmitted Carrier Wave (CW).
The RTC is automatically calibrated against the trimmed 40 MHz crystal oscillator reference at runtime,
and as such nothing needs to be done on the production line. During sleep, the RTC clocked wakeup
timer is used to time wakeup intervals (since the last Delivery Traffic Indication Message (DTIM) beacon in
regular Wi-Fi Power Save), and as such any residual inaccuracy is not accumulated.
4486_184 v1.0
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