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TA6038FNG Fiches technique(PDF) 4 Page - Toshiba Semiconductor

No de pièce TA6038FNG
Description  Shock Sensor IC
Download  10 Pages
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Fabricant  TOSHIBA [Toshiba Semiconductor]
Site Internet  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TA6038FNG Fiches technique(HTML) 4 Page - Toshiba Semiconductor

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TA6038FN/FNG
2003-11-25
4
Application Note
Figure 1 shows the configuration of G-Force sensor amplifier. The shock sensor is connected between the
pins 2 and 3.
< How to output 0 or 1 from the pin 10 to detect whether there is a shock or not. >
– Using a sensor with the sensitivity Qs (pC/G) to detect the shock g (G). –
a. Setting gain: C1 = C2 (pF), R1 (kΩ), R2 (kΩ)
(V)
0.4
R1
R2
5
2
C1
g
Qs
=
×
×
×
×
R1
R2
0.04
g
Qs
C2
C1
×
×
=
=
(pF)
425
10
100
0.04
5
0.34
C2
C1
=
×
×
=
=
b. Setting the frequency (Hz) of HPF: Setting C3 (
µF), R1 (kΩ)
103
C3
R1
2
1
(Hz)
fc
×
×
×
π
×
=
F)
(
0.8
103
20
10
2
1
C3
µ
=
×
×
×
π
×
=
c. Setting the frequency (kHz) of LPF: Setting C4 (pF), R2 (kΩ)
106
C4
R2
2
1
(kHz)
fc
×
×
×
π
×
=
(pF)
318
106
5
100
2
1
C4
=
×
×
×
π
×
=
< How to output the voltage according to the shock through the pin 7. >
– Using a sensor with the sensitivity Qs (pC/G), and assuming the shock sensitivity of the system is
Vsystem (mV/G). –
a. Setting gain: C1 = C2 (pF), R1 (kΩ), R2 (kΩ)
(mV/G)
103
Vsystem
R1
R2
5
2
C1
Qs
×
=
×
×
×
(pF)
10
R1
R2
Vsystem
Qs
C2
C1
4
×
×
=
=
(pF)
170
10
10
100
200
0.34
C2
C1
=
×
×
=
=
4
Figure 1
The Configuration of G-Force Sensor Amplifier
1
LPF
2
Shock
sensor
9
8
0.9 V
1.7 V
3
4
C1
C2
50M
50M
1.3 V
10
×5
Qs (pC/G)
R1
C3
C4
R2
7
Example: Detecting 5 (G)-shock using a sensor
with Qs = 0.34 (pC/G), R1 = 10 (kΩ), R2 = 100 (kΩ).
Example: Setting the frequency to 20 Hz with
R1 = 10 (kΩ).
Example: Designing the system with 200 (mV/G)
by using a sensor that Qs = 0.34 (pC/G),
R1 = 10 (kΩ), R2 = 100 (kΩ).
Example: Setting the frequency to 5 kHz with
R2 = 100 (kΩ).


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