AK4184A Datasheet, PDF (11/36 Pages) Asahi Kasei Microsystems – TSC with Keypad Scanner and GPIO Expander

[AK4184A]
■ λονεΫϦʔϯͷචѹݕग़
λονεΫϦʔϯͷචѹݕग़͸ɺYP pin ʹ VREF+ɺXN pin ʹ VREF-ͷిѹΛҹՃͨ͠ঢ়ଶͰɺXP pinɺYN pin
ͷిѹΛଌఆ͠ɺ̎ຕͷγʔτͷ઀৮఍߅Λࢉग़͢Δ͜ͱͰಘΒΕ·͢ɻ
͜Εʹ͸ 2 ͭͷํ๏͕͋Γ·͢ɻ
Ұͭ໨ͷํ๏͸ɺX ࣠ͷγʔτ఍߅(Rxplate)ͷΈ͕ط஌ͷ৔߹Ͱ͢ɻ͜ͷ৔߹ɺԼࣜͷΑ͏ʹɺ઀৮఍߅͕
ط஌ͷγʔτͷ࠲ඪͱɺZ1 ҐஔɺZ2 ҐஔΛٻΊΔ͜ͱͰɺ઀৮఍߅Λࢉग़Ͱ͖·͢ɻ
Rtouch = (Rxplate) * (Xposition/4096) * [(Z2/Z1) – 1]
ೋͭ໨ͷํ๏͸ɺX ࣠ɺY ࣠ͷ྆ํͷγʔτ఍߅(Rxplate, Ryplate)͕ɺط஌ͷ৔߹Ͱ͢ɻ͜ͷ৔߹ɺԼࣜͷΑ
͏ʹɺ઀৮ͨ͠ X ҐஔɺY ҐஔɺZ1 Ґஔ͔Β઀৮఍߅Λ͢·͖Ͱࢉܭɻ
Rtouch = (Rxplate * Xposition/4096) * [(4096/Z1) – 1] – Ryplate * [1 – (Yposition/4096)]
AVDD
YP-Driver SW ON
YP
AVDD
YP-Driver SW ON
YP
XP
VREF+
AIN+
ADC
VREF-
AIN-
XN
XN-Driver SW ON
YN
a) Z1-Position Measurement
Rtouch
XP
VREF+
AIN+
ADC
VREF-
AIN-
XN
XN-Driver SW ON
YN
b) Z2-Position Measurement
Figure 5. චѹଌఆճ࿏
Rtouch
MS0947-J-00
-11-
2008/04