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NRF7002-CEAA-R7 Datasheet(PDF) 13 Page - Nordic Semiconductor |
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NRF7002-CEAA-R7 Datasheet(HTML) 13 Page - Nordic Semiconductor |
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13 / 69 page  Power and clock management 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 v1.2 13 |
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