ta6038fng TOSHIBA Semiconductor CORPORATION, ta6038fng Datasheet - Page 4

• Manufacturer Part Number: ta6038fng
• Description: Shock Sensor Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Application Note
Qs (pC/G)
sensor
Shock
pins 2 and 3.
Figure 1 shows the configuration of G-Force sensor amplifier. The shock sensor is connected between the
< How to output 0 or 1 from the pin 10 to detect whether there is a shock or not. >
a. Setting gain: C1 = C2 (pF), R1 (kΩ), R2 (kΩ)
b. Setting the frequency (Hz) of HPF: Setting C3 (µF), R1 (kΩ)
c. Setting the frequency (kHz) of LPF: Setting C4 (pF), R2 (kΩ)
< How to output the voltage according to the shock through the pin 7. >
a. Setting gain: C1 = C2 (pF), R1 (kΩ), R2 (kΩ)
Vsystem (mV/G). –
C1
C1
fc
fc
Qs
Qs
C1
– Using a sensor with the sensitivity Qs (pC/G) to detect the shock g (G). –
C1
– Using a sensor with the sensitivity Qs (pC/G), and assuming the shock sensitivity of the system is
(Hz)
(kHz)
2
3
=
=
×
×
Figure 1 The Configuration of G-Force Sensor Amplifier
g
C2
C2
2
50MΩ
50MΩ
×
×
C
C
=
=
=
=
1
2
2
5
2
×
×
Qs
Vsystem
2
×
0.04
5
×
R2
R1
1
4
π
Qs
×
×
π
×
g
R2
R1
×
1
R1
=
×
1
R2
LPF
Vsystem
R2
R1
×
=
×
×
C3
0.4
C4
R2
R1
×
(V)
×
10 3
×
×5
×
10
10 6
10 3
4
(pF)
(mV/G)
9
C
3
4
R
1
1.3 V
C1
C3
C4
C1
8
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: Setting the frequency to 5 kHz with
R2 = 100 (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).
=
=
=
=
C2
C2
2
2
×
×
C
R
=
=
4
2
π
π
×
0.34
×
0.34
200
1
1
10
100
0.04
×
7
×
×
×
20
5
100
5
1.7 V
0.9 V
10
×
×
×
100
10 3
10 6
10
×
10
=
=
=
4
425
0.8
318
=
170
TA6038FN/FNG
(
(pF)
µ
(pF)
F)
(pF)
2003-11-25
10