STM32WB HSE tune
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2023-10-25 05:09 AM - edited 2023-10-25 05:33 AM
Hi,
What error on HSE frequency is acceptable by STM32WB35? More than 1 kHz can disturb connection process (its interrupted or it's slow than usual on some phones) or can cause unexpected disconnection?
Does this affect the range of the advertisement ?
Best,
msemegen
Solved! Go to Solution.
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BLE
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STM32WB series
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2023-10-26 08:06 AM
Are you using 802.15.4? If so, then no.
Even if you're just using BLE, if it were my product, I wouldn't ship something that had 47 ppm off if the limit was ±50 ppm. Things will drift with time and temperature.
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2023-10-25 08:02 PM
Per the datasheet:
50 ppm for Bluetooth Low Energy, 40 ppm for 802.15.4 and when both Bluetooth Low Energy and 802.15.4 are used.
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2023-10-25 10:54 PM
According to this calculator https://www.everythingrf.com/rf-calculators/ppm-to-hz-calculator currently we are at 57 ppm level (~18000 Hz). Using hse tune techniques we can lower it to 47 ppm (which is a little bit lower than maximum error). 47 ppm will be good enough?
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2023-10-26 08:06 AM
Are you using 802.15.4? If so, then no.
Even if you're just using BLE, if it were my product, I wouldn't ship something that had 47 ppm off if the limit was ±50 ppm. Things will drift with time and temperature.