AN4650 datasheet(34/102 Pages) STMICROELECTRONICS

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Reading output data

AN4650

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DocID027415 Rev 1

3.7.2

Level-sensitive trigger stamping

The level-sensitive trigger is enabled when the LVLen bit of the CTRL6_C register is set to 1

and the TRIG_EN and LVL2_EN bits are set to 0.

Once enabled, the LSB of the generated gyroscope X, Y, Z output data is replaced with the

current DEN (INT2 pin) level.

Figure 8. Data synchronization: level-sensitive

3.7.3

Impulse-sensitive trigger stamping

The impulse-sensitive trigger is enabled when the LVLen and LVL2_EN bits of the

CTRL6_C register are set to 1 and the TRIG_EN bit is set to 0. Furthermore, both

accelerometer and gyroscope sensors have to be in active mode and configured with the

same ODR value.

The impulse-sensitive trigger is similar to the level-sensitive trigger and has to be used if the

duration of the DEN pulse is shorter than the selected gyroscope ODR. Once enabled, the

LSB bit of the gyroscope X, Y, Z output data generated after the pulse is set to 1; if no pulse

occurs, the LSB bit of the next generated gyroscope X, Y, Z output data is set to 0.

3.8

Gyroscope axes orientation

Axes orientation and sign of the gyroscope sensor can be changed by software using the

ORIENT_CFG_G register, as illustrated in Figure 9.

Figure 9. Gyroscope axes orientation and sign configuration

The Orient_[2:0] bits of the ORIENT_CFG_G register allows driving the pitch, roll and yaw

physical axes to the X, Y and Z output registers as indicated in Table 23.

AN4650 Datasheet(PDF) 34 Page - STMicroelectronics