SensorsのトピックRe: FXPS7115D4

FXPS7115D4

Fast — Tue, 03 Feb 2026 20:50:30 GMT

Has anyone got a working FXPS7115D4?

I think "7.5.5.3 SPI error
The following external SPI conditions result in a SPI error:

• The number of SCLK rising edges detected while SS_B is asserted is not equal to 16"

An example command and response would be great.

Re: FXPS7115D4

Fast — Tue, 20 Jul 2021 09:24:12 GMT

OK go sideways shame app notes are rarely listed in datasheet. Which I think us engineers is nearly a requirement as complexity increases.

AN12731 8-bit CRC calculation procedure using SPI communication for the FXPS7xxxD4 pressure sensor

Re: FXPS7115D4

TomasVaverka — Tue, 20 Jul 2021 11:00:45 GMT

Hello Richard,

Please find attached an example project which simply reads the pressure and temperature registers. The project uses the KE15Z MCU as this is what we are targeting for our evaluation HW.

Pre-Requisite tool to be installed before running the project: MCUXpresso IDE, Serial terminal (e.g. Tera Term).

SDK requirement: Download and import FRDMKE15 SDK into MCUXpresso. Here is some sample educational video.

Importing example project: Once you have installed SDK, simply drag ‘.project’ file into MCUXpresso’s ‘Project Explorer’ tab.

Best regards,

Tomas

Re: FXPS7115D4

Fast — Tue, 20 Jul 2021 12:56:07 GMT

Sorry Tomas that does not help.

I can read TEMP sucesfully.

Yet a read of register $62 followed by $63, appears to return an extended sign byte and lower byte data for something.

What registers should I read, or have I missed some configuration or initialization process?

Re: FXPS7115D4

Fast — Tue, 20 Jul 2021 14:43:22 GMT

OK so need to point SNSDATA0 at pressure signal, strange to default to nowhere.

Now a signal that responds, typical result 0x7CE5 how does this make ~ 101kPa?

( 31,981 - 25,536 ) / 93.34 = 69kPa barometer on wall says 101kPa !! where have I gone wrong?

Re: FXPS7115D4

Fast — Wed, 21 Jul 2021 14:28:52 GMT

There is no response to 7.5.3.3 Sensor data request commands, always 0x0C0003D4.

What is wrong? all status registers good.

Re: FXPS7115D4

Fast — Wed, 21 Jul 2021 14:46:33 GMT

Ah! SID0_EN must be set = 1, another strange setting.

Re: FXPS7115D4

Fast — Wed, 21 Jul 2021 16:04:21 GMT

OK sum 12bit data 01 1001 011 00 not on nibble boundary

(1,692 – ( -1566))/46.67 = 69.8kPa and it is 102.5kPa today!

And yes I have checked part number on device.

Re: FXPS7115D4

Fast — Thu, 22 Jul 2021 09:48:16 GMT

Very sorry Tomas I must have damaged part!

Had 2nd part fitted and all good untrimmed error 0.4kPa.

I had applied pressure using a pipe and syringe to sensor and could easily exceed the low Pmax 150kPa.