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L3GD20H データシート(PDF) 25 Page - STMicroelectronics

部品番号 L3GD20H
部品情報  MEMS motion sensor: three-axis digital output gyroscope
PDF  52 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L3GD20H データシート(HTML) 25 Page - 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
1
0
0
Level sensitive trigger
0
1
0
Edge sensitive trigger
1
0
1
Impulse sensitive trigger
xi(15-1)
xi,yi,zi
D
E
N
yi(15-0)
Zi(15-0)
xi-N+1
N
D
E
(15-1)
yi-N+1
(15-0)
zi-N+1
(15-0)
xi(15-0)
xi,yi,zi
D
E
N
yi(15-1)
Zi(15-0)
xi(15-0)
xi,yi,zi
N
D
E
yi(15-0)
Zi(15-1)
xi-N+1
N
D
E
(15-0)
yi-N+1
(15-0)
zi-N+1
(15-1)
xi-N+1
N
D
E
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
d
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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