52840 SCH Review

RE: 52840 SCH Review

zz19930722 — Tue, 22 Nov 2022 08:32:48 GMT

ok,I got it.Thank you very much!

RE: 52840 SCH Review

Bendik Heiskel — Tue, 22 Nov 2022 08:17:31 GMT

If there are high frequency signals on the pins marked low frequency there will be noise on the radio transmission and the RX sensitivity will be worsen. This means that if pins marked low frequency is used for QSPI, and there is communication happening on the QSPI lines while a radio event is happening the wireless performance will be reduced.

RE: 52840 SCH Review

zz19930722 — Tue, 22 Nov 2022 07:01:02 GMT

If the QSPI peripheral is not used simultaneously as the radio any of the pins can be used

What does this mean, doesn't the QSPI peripheral communicate with the radio device just fine?
Our module is a wireless communication module.

RE: 52840 SCH Review

zz19930722 — Tue, 22 Nov 2022 02:19:41 GMT

If the QSPI peripheral is not used simultaneously as the radio any of the pins can be used

What does this mean, doesn't the QSPI peripheral communicate with the radio device just fine?
Our module is a wireless communication module.

RE: 52840 SCH Review

Bendik Heiskel — Mon, 21 Nov 2022 15:12:01 GMT

Hi,

[quote user=""]We plan to use the 52840 to make a module with an external flash, if we apply the QSPI peripheral, must we use the P0.23,P1.00,P0.21,P0.25,P0.19 pins recommended in the specification?[/quote]

Any of the pins not labeled "Standard drive, low frequency I/O only" can be used for QSPI. If the QSPI peripheral is not used simultaneously as the radio any of the pins can be used.

[quote user=""]2. please help me to check the schematic design reasonableness, is it OK to choose these pins for QSPI?[/quote]

The pins used for QSPI in the schematic is OK to use.

C14 and C15 must be changed to 1uF, other than this the schematic looks good.

Best regards,

Bendik