6

Features

6.1

Self-test mode

In self-test mode the mechanical element is stimulated by electrostatic force to obtain an equivalent input force

applied to the sensor. This equivalent input force applied has to be comparable with the full-scale range in order

to have an effective self-test mode.

The self-test mode can be enabled using the I²C interface, setting the ST bit in register TEST_REG (0Bh) to 1.

For the self-test values of each axis please refer to Table 2. Mechanical characteristics.

6.2

Power cycle/reset information

6.2.1

TDM interface power-on sequence

In TDM, the AIS25BA starts in disabled mode with the following sequence.

The TDM interface must be activated explicitly with I²C configuration. The first 3 samples after the enabling of

the TDM may be invalid samples due to the fact that the interface should sync on the external WCLK. The

samples will be invalid also after any subsequent disable-enable transition that may happen. TDM protocol can be

changed on the fly, but also in this case the first 3 samples after the TDM configuration change will be invalid.

AIS25BA

Features

DS14019 - Rev 1

page 16/31