חיישנים — 11.001 · הנדסת אלקטרוניקה ומחשבים

R(T) = R₂₅ · e^{B·( 1T − 1T₂₅ )} | T[K] = t[°C] + 273.15 | V_s = V_cc · R(T)R_s + R(T) | V_s < V_ref ⟹ ON

25 °C

10.0 kΩ

3500 K

10.0 kΩ

1.82 V

—

R(25°C) = 10 kΩ → V_s = 5 · 10 / (10 + 10) = 2.50 V

3500 · ( 1/333.15 − 1/298.15 ) = 3500 · (−0.0003524) = −1.233

R = 10 · e^−1.233 = 2.91 kΩ → V_s = 5 · 2.91 / 12.91 = 1.13 V

3500 · ( 1/313.15 − 1/298.15 ) = −0.5623 → R = 10 · e^−0.5623 = 5.70 kΩ

V_ref = 5 · 5.70 / (10 + 5.70) = 1.82 V

x(t) = X · sin(ω·t) | v(t) = ω · X · cos(ω·t) | e(t) = k · v(t) | ω = 2·π·f | T = 1f | I = UR | P = U²2 · R

1000 Hz

20 µm

2.0 mV·s/mm

4.0 V

8 Ω

—

T = 1 / 1000 = 1 ms | V_rms = 10 / √2 = 7.07 mV

A_v = 1 + 991 = 100

U = 100 · 10 mV = 1.0 V

I = 1.08 = 0.125 A

P = 1.0²2 · 8 = 62.5 mW

R(E) = R₁₀ · ( E10 )^−γ | log R = log R₁₀ − γ · log E10 | V_s = V_cc · R(E)R_s + R(E) | V_s < V_ref ⟹ ON

10 lx

20.0 kΩ

0.80

10.0 kΩ

1.99 V

—

R(10 lx) = 20 kΩ → V_s = 5 · 20 / (10 + 20) = 3.33 V

R = 20 · 10^−0.8 = 20 · 0.1585 = 3.17 kΩ

V_s = 5 · 3.17 / (10 + 3.17) = 1.20 V

R = 20 · 4^−0.8 = 20 · 0.3299 = 6.60 kΩ

V_ref = 5 · 6.60 / (10 + 6.60) = 1.99 V