Must LPS25HB reserved pin 3 be grounded?

[MStro.1]

Pin 3 which is reserved should be grounded according to the data sheet but was left floating on our boards. May this be the cause of SPI issues? Regardless of what we read or write, we see LPS25HB output 0xff11 on SDO. LPS25HB outputs data on falling edge of SCL, so the device seem to be somewhat alive.

[Eleon BORLINI]

Hi @MStro.1​ , unfortunately the pin 3 must be connected to GND or properly managed to GND by the application processor at startup, as reported in the datasheet. This because of reserved features of the LPS25HB product. Would it be difficult for you to slightly change your application layout? Regards

[MStro.1]

Hi Elon,

Thanks for your answer!

We have a batch of PCB's with quite expensive components which have pin 3 floating. Is there any undocumented workaround so we don't have to dispose of our boards?

Thanks in advance!

[Eleon BORLINI]

Hi @MStro.1​ , I understand... unfortunately there is no workaround such a soft "disable pin" or "activate pull-down" :( I' afraid you should find a way to patch the pcb via hardware connection, or with a pull down resistor... Btw, can you check if setting the Vdd e.g. at 3.3V and the VddIO at 1.8V the issue can be reduced? Regards