L3GD20H datasheet(25/52 Pages) STMICROELECTRONICS

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L3GD20H

Digital main blocks

4.3

Level-sensitive/edge sensitive/impulse sensitive data enable

L3GD20H allows external trigger level recognition through enabling EXTRen and LVLen bits

into CTRL2 (21h) and IMPen bit into CTRL4 (23h). Three different modes can be used:

level, edge or impulse sensitive trigger.

Figure 15. Trigger stamping

4.3.1

Level sensitive trigger stamping

Level sensitive trigger can be enabled by setting to ‘1’ the LVLen bit into CTRL2 (21h) while

EXTRen bit into CTRL2 (21h) and IMPen bit into CTRL4 (23h) have to be set to ‘0’.

Once enabled, DEN level replaces the LSB of X, Y or Z axes configurable through Xen, Yen,

Zen bits into CTRL1 (20h). Data is stored inside the FIFO with the internal selected ODR.

4.3.2

Edge sensitive trigger

Edge sensitive trigger can be enabled by setting to ‘1’ the EXTRen bit into CTRL2 (21h)

while LVLen bit into CTRL2 (21h) and IMPen bit into CTRL4 (23h) have to be set to ‘0’.

Table 9. Trigger stamping mode

LVLen

EXTRen

IMPen

Trigger stamping mode

Level sensitive trigger

Edge sensitive trigger

Impulse sensitive trigger

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 Y-axis

Yen=1, Xen=Zen=0

Level-sensitive

Trigger enabled

on X-Axis

Xen=1,Yen=Zen=0

Level-sensitive

Trigger enabled

on Z-axis

Zen=1, Xen=Yen=0

GAMS290120131645FSR

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