L7250 datasheet(41/46 Pages) STMICROELECTRONICS

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L7250

4.5 Shock Sensor

This block takes input from a piezoelectric or charging mode shock sensor element (selectable using the SPI

bit ShockConf -> Reg02H, bit 7 ), and includes external filtering capability. A digital latched signal is available

on SkDout pin if the Sken bit (from SPI) is set to 1 otherwise the SkDout pin is transparent to the shock signal.

If the output signal has been latched, a pulse to zero of the Sken bit it is necessary to clear it.

The shock sensor element will be connected to the Skin and VREF25.

Figure 19. Piezoelectric Shock Sensor typical application block diagram (Reg02H->bit7=0)

Figure 20. Charging Shock Sensor typical application block diagram (Reg02H->bit7=1)

24 SkO ut

Sk F o u t

25 SkF in

V ref25+ V thH

V ref25-V thL

Sk D o u t

Vre f2 5

Sk in

Vref25

S kE n (fro m S PI)

R1 e x t

C1 ex t

C2 ex t

R2 ex t

10M

24 SkO ut

S k F out

25 SkFin

V ref25+V thH

V ref25-V thL

S k D out

Vre f2 5

Sk in

Vref25

S kE n (from SP I)

R1 ex t

C1 ex t

C2 ex t

R2 e x t

Vref25

CSex t

RSex t

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