LSM330 datasheet(28/75 Pages) STMICROELECTRONICS

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Functionality

LSM330

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DocID023426 Rev 3

4.3.8

Level-sensitive / edge-sensitive data enable

The LSM330 allows external trigger level recognition through the enabling of the EXTRen

and LVLen bits in the CTRL_REG2_G register. Two different modes can be used: level-

sensitive or edge-sensitive trigger.

Figure 12. Level-sensitive trigger stamping (LVLen = 1; EXTRen = 0)

4.3.9

Level-sensitive trigger stamping

Once enabled, the DEN level replaces the LSb of the X, Y or Z axes, configurable through

the Xen, Yen, Zen bits in the CTRL_REG1_G register. Data is stored in the FIFO with the

internally-selected ODR.

4.3.10

Edge-sensitive trigger

Once enabled by setting EXTRen = 1, FIFO is filled with the pitch, roll and yaw data on the

rising edge of the DEN input signal. When selected ODR is 800 Hz, the maximum DEN

sample frequency is fDEN = 1/TDEN = 400 Hz.

xi(15-1)

xi,yi,zi

yi(15-0)

Zi(15-0)

xi-N+1

(15-1)

yi-N+1

(15-0)

zi-N+1

(15-0)

xi(15-0)

xi,yi,zi

yi(15-1)

Zi(15-0)

xi(15-0)

xi,yi,zi

yi(15-0)

Zi(15-1)

xi-N+1

(15-0)

yi-N+1

(15-0)

zi-N+1

(15-1)

xi-N+1

yi-N+1

Zi-N+1

(15-0)

(15-1)

(15-0)

Level-sensitive

Trigger enabled

on X-Axis

Level-sensitive

Trigger enabled

on Y-axis

Level-sensitive

Trigger enabled

on Z-axis

Xen=1,Yen=Zen=0

Yen=1, Xen=Zen=0

Zen=1, Xen=Yen=0

AM10162V1

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