MMA8451Q reset

[kubiznak_petr]

In the MMA8451 accelerometer datasheet, I did not find too much information on the device reset and startup process.

Naturally, when I reset the device (writing to the CTRL_REG2), it needs some time before it can again communicate. Can someone please describe the device reset process or at least advice on recommended delay (minimum but sufficient) before the communication can be initiated again? And is it the same for all three types - MMA8451Q, MMA8452Q and MMA8453Q? Thanks.

[TomasVaverka · Accepted solution]

Hi Petr,

A software reset can be activated by setting the RST bit in the CTRL_REG2 register in both Standby and Active modes. The boot mechanism resets all registers and loads them with their default values that are shown in Table 12 of the data sheet. It  takes approximately 350us (500us max) and is the same for all MMA845xQ accelerometers.

Let me know if you have any other questions.

Regards,

Tomas

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