AN4650 datasheet(33/102 Pages) STMICROELECTRONICS

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AN4650

Reading output data

102

3.7

Gyroscope edge-sensitive/level-sensitive/impulse-sensitive

data enable (DEN)

The LSM6DS3 allows external trigger level recognition by configuring the TRIG_EN, LVLen

and LVL2_EN bits of the CTRL6_C register (Table 21). The default value for these three bits

is 0 (external trigger is disabled). Three different trigger modes can be used: edge-, level-, or

impulse-sensitive trigger; the Data Enable (DEN) input signal is driven on the INT2 pin,

which is configured as an input pin when one of the gyroscope trigger modes is enabled.

Edge-sensitive and impulse-sensitive triggers need both accelerometer and gyroscope

sensors to be active (not in Power-Down mode) and configured with the same output data

rate value. The level-sensitive trigger can also work with only the gyroscope in active mode,

regardless of the selected gyroscope ODR.

3.7.1

Edge-sensitive trigger

The edge-sensitive trigger is enabled when the TRIG_EN bit of CTRL6_C register is set to 1

and the LVLen and LVL2_EN bits are set to 0. Furthermore, both accelerometer and

gyroscope sensors have to be in active mode and configured with the same ODR value.

Once enabled, the gyroscope output registers are updated with the next generated X, Y, Z

gyroscope data at the rising edge of the DEN (INT2 pin) input signal. If no rising edge

occurs, the gyroscope output registers are not updated.

Figure 7. Data synchronization: edge-sensitive

Table 21. DEN configurations

TRIG_EN

LVLen

LVL2_EN

Function

Edge-sensitive

Level-sensitive

Impulse-sensitive

AN4650 Datasheet(PDF) 33 Page - STMicroelectronics