AK4182A Datasheet, PDF (10/18 Pages) Asahi Kasei Microsystems – Touch Screen Controller

ASAHI KASEI


■ Թ౓ଌఆ
μΠΦʔυͷಛੑ͸ɺҎԼͷࣜͰۙࣅग़དྷ·͢ɻ
i_D = I₀exp(v_D/V_T) (ͨͩ͠ V_T = kT/q)
<1>
I₀: ҉ిྲྀ
q : 1.602189×10^-19 (ిࢠͷిՙ)
k : 1.38054×10^-23(ϘϧπϚϯఆ਺)
v_D: μΠΦʔυ઀߹ిѹ
T: ઈରԹ౓
μΠΦʔυ઀߹ిѹ͸Թ౓ʹൺྫ͢ΔͨΊɺ͜ͷిѹΛଌఆ͢Δ͜ͱͰԹ౓Λ஌Δ͜ͱ͕ՄೳͰ͢ɻ
[AK4182A]
Temp.
iD1
Sensor
iD2
=I
= 91 x I
TEMP0
TEMP1
Figure 5 Թ౓ଌఆճ࿏
AK4182A͸ɺFigure 5 ͷΑ͏ʹҟͳΔ 2 छྨͷిྲྀΛग़ྗ͢Δఆిྲྀճ࿏ͱμΠΦʔυΛ಺ଂ͓ͯ͠Γɺ2 छྨͷํ๏
ʢ̍ճมࣜํ׵ɺ2 ճมࣜํ׵ʣͰԹ౓ଌఆΛߦ͏͜ͱ͕ՄೳͰ͢ɻ
̎ճมͰࣜํ׵͸ɺ2 छྨͷҟͳΔిྲྀʹର͢ΔμΠΦʔυ઀߹ిѹΛଌఆ͢Δ͜ͱͰɺ༧ΊɺಛఆԹ౓ʹର͢ΔϦϑ
ΝϨϯεిѹΛ஌Δ͜ͱͳ͘ɺ௚઀ઈରԹ౓Λ஌Δ͜ͱ͕ՄೳͰ͢ɻ
<1>ࣜΑΓ
(i_D2 / i_D1) = exp {(V(91 x I) – V(I))/V_T} ͨͩ͠ N = (i_D2 / i_D1) = 91 (ిྲྀൺ)
T°C = ΔVbe * q / (k * ln N) – 273
ΔVbe = V(91 x I) – V(I)
T°C = 2.573×10³ × ΔVbe – 273
͋ΔԹ౓ͰμΠΦʔυ઀߹ిѹ͕෼͔͍ͬͯΔ৔߹͸ɺ<2>ࣜΑΓ 1 ճͷଌఆͰ΋ࡏݱͷԹ౓Λ஌Δ͜ͱ͕ՄೳͰ͢ɻ
T = (k/q)* v_D/ln(i_D/I₀)
<2>
MS0482-J-01




2007/12