read device id of fxos8700,but always return 0

[sofia_0571]

@all

before read device id, microchip set fxos8700 rst pin to low.i cannot found issues where is it.

tks.

[sofia_0571]

by the way use i2c interface to read/write data.

just now read https://www.nxp.com/docs/en/errata/FXOS8700CQER.pdf  .i2c have same issue? tks.

[TomasVaverka]

Hi David,

Do you have a logic analyzer or an oscilloscope to see what is going on the bus?

Please make sure you are using a correct I2C slave address depending on the voltage on SA0 and SA1 pins:

In my example below, both SA0 and SA1 pins are connected to GND which translates to 0x3C (0x1E << 1) for a write and 0x3D ((0x1E << 1) | 0x01) for a read.

I hope it helps.

Best regards,

Tomas