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TA6038FNG Fiches technique(PDF) 4 Page - Toshiba Semiconductor |
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TA6038FNG Fiches technique(HTML) 4 Page - Toshiba Semiconductor |
4 / 10 page 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 Ω 50M Ω 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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