AK4184A Datasheet, PDF (21/36 Pages) Asahi Kasei Microsystems – TSC with Keypad Scanner and GPIO Expander

[AK4184A]
■ ΩʔύουεΩϟφ
AK4184A ͸ɺ࠷େ 6 ྻ x 5 ߦͷΩʔύουͷ઀ଓՄೳͳΠϯλʔϑΣʔεΛ͍࣋ͬͯ·͢ɻ
■ Ωʔύουଌఆγʔέϯε
KST1 bit = “0” (default)ͱ͢Δ͜ͱͰɺΩʔ଴ͪঢ়ଶͱͳΓɺΩʔύουͷԡ͠Լ͛ݕग़ʹΑΓΩʔύουଌ
ఆʹҠߦ͠·͢ɻͦͷࡍɺKST0 bit ʹΑͬͯɺϗετεΩϟϯͱΩʔϓϨεεΩϟϯͷ 2 ͭͷಈ࡞Λߦ͍·
͢ɻ
■ ϗετεΩϟϯ


KST0 bit =“1”ͷ৔߹ɺϗετεΩϟϯͱͳΓ·͢ɻΩʔύουԡ͠Լ͛ݕग़ʹΑΓɺΩʔύουׂΓࠐ
ΈΛग़ྗ(KEYIRQN pin ↓)͠ɺϗετίϚϯυ଴ͪঢ়ଶͱͳΓ·͢ɻϗετίϚϯυΛड͚औΔ·Ͱ͸಺
෦ OSC ͸ύϫʔμ΢ϯͨ͠··ͰɺΩʔεΩϟϯΛ࣮ߦ͠·ͤΜɻΩʔεΩϟϯΛ։࢝͢ΔͨΊʹ͸ɺ
KPScanInitiate ίϚϯυ(Page1ɺAddress 04H)Λॻ͖ࠐΜͰ͍ͩ͘͞ɻίϚϯυΛൃߦ͢Δͱɺ಺෦ OSC
ΛύϫʔΦϯ͠ɺσό΢ϯεεΩϟϯʹҠߦ͠·͢ɻ
■ ΩʔϓϨεεΩϟϯ


KST0 bit = “0”ͷ৔߹ɺΩʔϓϨεεΩϟϯͱͳΓ·͢ɻΩʔύουԡ͠Լ͛ݕग़ʹΑΓɺΩʔύουׂ
ΓࠐΈΛग़ྗ͠ɺࣗಈతʹ಺෦ OSC ΛύϫʔΦϯͯ͠σό΢ϯεεΩϟϯʹҠߦ͠·͢ɻ
σό΢ϯεΩʔεΩϟϯ͕ऴྃ͢ΔͱɺσʔλϨδελ(KPDATA1, KPDATA2)Λߋ৽͠ɺKEYIRQN pin Λ”H”
ʹ͠ɺϗʔϧυʹҠߦ͠·͢ɻϗʔϧυؒظதɺΩʔݕग़͸ແޮͱͳΓ·͢ɻHold ؒظதʹΩʔσʔλΛಡ
Έग़ͨ͠৔߹ɺ৽ͨʹ Hold ͚࣌ؒͩ଴ͬͯΩʔύουγʔέϯεΛऴྃ͠·͢ɻHold ؒظதʹσʔλ͕ಡΈ
ग़͞Εͳ͔ͬͨ৔߹ɺσό΢ϯεऴ͔ྃΒ Hold ܦؒ࣌աͨ࣌͠఺ͰΩʔύουγʔέϯεΛऴྃ͠·͢ɻͨ
ͩ͠ɺσʔλ͕ಡΈग़͞Ε͍ͯͳ͍৔߹͸ɺHold ܦؒ࣌աޙ΋σʔλΛಡΈग़͢·Ͱͷؒ͸ɺΩʔݕग़͸ແ
ޮͱͳΓ·͢ɻ
Hold ܦ͕ؒ࣌ա͠ɺσʔλΛಡΈग़͢͜ͱͰΩʔׂΓࠐΈ͕༗ޮʹͳΓ·͢ɻ
σʔλ͕ಡΈग़͞Ε͔ͨͲ͏͔͸ɺPage0 ͷ Address00h ͔ 01h ͷͲͪΒ͔ΛಡΈग़͢͜ͱͰೝࣝ͠·͢ɻ
σό΢ϯε࣌ؒͼٴϗʔϧυ࣌ؒ͸ Keypad Control Register(KEY)Ͱௐ੔͢Δ͜ͱ͕ՄೳͰ͢ɻ
Keypad Debounce Scan initiated by Host (Initial : KST1 bit="0", KST0 bit="1")
Ry
KEYIRQN
BUSY
CSN
DIN
DOUT
KPScanInitiate
KPScanInitiate
KPDATA1,2
KPDATA1,2
State
Key
Detect
Enable
Debounce
wait
Scan
HOLD
Key
Detect
Disable
Debounce
Scan
HOLD
Key Detect
Enable
HoldؒظதʹRead͕࣮ߦ͞ΕΔͱɺ
then wait ^{Readऴྃޙɺ࠶ͼHold࣌ؒΛ։࢝͢Δɻ}
Figure 13. Timing Diagram for keypad debounce scan initiated by Host
(Initial : key interrupt enable, wait for Host instruction)
MS0947-J-00
-21-
2008/04