MMA8452Q, sensor toolbox I2C address

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MMA8452Q, sensor toolbox I2C address

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jannek
Contributor I

Hello,

Is it possible to have the MMA845xQ evaluation kit (LFSTBEB845x + LFSTBUSB) talk to

an MMA8452Q at I2C address 0x1C (SA0=0) instead of 0x1D (SA1=1)?

We have an MMA845xQ eval kit (LFSTBEB845x + LFSTBUSB) which works fine with the

bundled MMA8452Q DIL breakout board, but due to tight space constraints I'm attempting

to use the accelerometer section we've cut off of a production board.

Our board has SA0 pin grounded (trace is under the QFN package so can't cut it without

reworking), but looking at I2C comms between the evkit and the MMA8452Q it seems the

evkit expects SA0=1, even if I ground the SA0 pin (J1-7) on the DIL socket.

The NVM logger feature of the sensor toolbox is what we intended to use, in case that

makes a difference. Only 4 wires (Vdd, gnd, scl, sda) are connected to the evkit, but the target

board has bypass caps and connects all the supply/gnd pins.

Thanks,

Janne

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troydaniel
NXP Employee
NXP Employee

Hello Janne,

Unfortunately the code running on the MS08 core on the STB evaluation (middle) board is only checking the 0x1C address for the MMA845x and will not see the part if it uses the 0x1D address.

Regards,

Troy

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