AK4184A Datasheet, PDF (19/36 Pages) Asahi Kasei Microsystems – TSC with Keypad Scanner and GPIO Expander

[AK4184A]
■ ϖϯׂΓࠐΈ



ϖϯׂΓࠐΈ͸ɺϖϯ͕λονεΫϦʔϯʹ઀৮ͨ͜͠ͱΛ஌ΒͤΔػೳͰɺA/D ίϯόʔλ͕ύϫʔμ΢
ϯঢ়ଶͷ࣌ʹಈ࡞͠·͢ɻׂΓࠐΈΠωʔϒϧͷঢ়ଶͰ͸ɺYN pin ͸ GND ʹ઀ଓ͠·͢ɻ·ͨɺXP pin ͸ɺ
಺෦఍߅(Ri: typ.50KΩ)ͰϓϧΞοϓঢ়ଶʹͳΓ·͢ɻ·ͨɺPENIRQN pin ͸ɺ಺෦Ͱ XP pin ͱ઀ଓ͞Ε·͢ɻ
ϖϯ౳ʹΑΓλονεΫϦʔϯ͕ԡ͞ΕΔͱɺλονεΫϦʔϯͷ 2 ຕͷγʔτ͕઀ଓ͢ΔͨΊɺ(AVDD)---
(Ri)--- (XP) -- (λονεΫϦʔϯ) -- (YN)ܦ༝Ͱిྲྀ͕ྲྀΕ·͢ɻλονεΫϦʔϯͷ఍߅͸ɺҰൠʹ਺ඦ Ω
ͳͷͰɺPENIRQN pin ͸ “L” ʹͳΓ·͢ɻϖϯΛ཭͢ͱ 2 ຕͷγʔτ͕઀ଓ͕੾ΕΔͨΊిྲྀ͕ྲྀΕͳ͘ͳ
ΓɺPENIRQN pin ͸ “H” ʹͳΓ·͢ɻPENIRQN pin ͸ɺόοϑΝग़ྗͰ͢ɻϑϧεέʔϧ͸ɺIOVDD نͰఆ
͞Ε·͢ɻ
λονεΫϦʔϯίϚϯυΛॻ͖ࠐΜͩ৔߹ɺ
PD = “1” ઃఆ࣌͸ɺϖϯׂΓࠐΈ͸ແޮͱͳΓϖϯλονʹؔ܎ͳ͘ৗʹ “H” ʹͳΓ·͢ɻ
PD = “0” ઃఆ࣌͸ɺ3SCLK ↓͔ΒCSN ↑ͷ۠ؒ(Figure 7)͸ɺϖϯλονʹؔ܎ͳ͘ৗʹ “H” ʹͳΓ·͢ɻͦΕ
Ҏ֎ͷؒظ͸ɺϖϯׂΓࠐΈ͕༗ޮͱͳΓɺϖϯλον͍ͯ͠Δ৔߹͸ “L”ɺ͍ͯ͠ͳ͍৔߹͸ “H” ʹͳΓ
·͢ɻ
·ͨɺλονεΫϦʔϯίϚϯυҎ֎ͷϨδελॻ͖ࠐΈಡΈग़͠ίϚϯυ͕ൃߦ͞Εͨ৔߹͸ɺҰ൪࠷৽
ͷ PD bit ͷઃఆ஋ʹΑΓ PENIRQN pin ͷಈ࡞͕ܾ·Γ·͢ɻ
λονύωϧϒϩοΫΛύϫʔμ΢ϯ(TPPD bit = “1”,Table 38)͢Δࣄ͕ՄೳͰɺ͜ͷঢ়ଶͰ͸શͯͷυϥΠό
͕ΦϑʹͳΓɺϖϯׂΓࠐΈ͕ແޮʹͳΓ·͢ɻϖϯμ΢ϯ࣌ʹ͓͍ͯ΋λονύωϧܦ༝Ͱిྲྀ͕ྲྀΕΔ
͜ͱ͸͋Γ·ͤΜɻ
IOVDD
Ri =
50kΩ
AVDD
EN
Driver OFF
PENIRQN
AVDD
XP
YN
Driver ON
Figure 10. ϖϯׂΓࠐΈճ࿏
MS0947-J-00
-19-
2008/04