AK4184A Datasheet, PDF (14/36 Pages) Asahi Kasei Microsystems – TSC with Keypad Scanner and GPIO Expander

[AK4184A]
■ σΟδλϧ I/F
AK4184A ͸ɺSPI όεܦ༝Ͱϗετϓϩηοαͱ௨৴͠·͢ɻϗετϓϩηοα͸ɺγϦΞϧΫϩοΫʹί
ϚϯυΛಉͯ͠ظ௨৴Λ։࢝͠·͢ɻ௿ిѹͰಈ࡞͢ΔϗετϓϩηοαͱͷΠϯλʔϑΣʔεΛ༰қʹ͢
ΔͨΊʹɺσΟδλϧ I/F ݯి༻IOVDD Λ࣋ͪɺ1.6V ͔Βಈ࡞͢Δ͜ͱ͕ՄೳͰ͢ɻ
Touch Panel
AVDD=2.5V ~ 3.6V
IOVDD=1.6V~AVDD
X-Plate (Top side)
XP
XN
YN
YP
Y-Plate (Bottom side)
8 GPIO
AK4184A
IOVDD
CSN
TP Interface
SCLK
KP Interface
DIN
μP
GPIO port
DOUT
BRCONT
PENIRQN
KEYIRQN
6x5
KEYPAD
LED Driver
Figure 8. SPI ઀ଓͱೖྗσόΠε઀ଓ
Ϩδελઃఆ͸̐ઢࣜγϦΞϧ I/F pin (CSN, SCLK, DIN, DOUT pins)Ͱॻ͖ࠐΈɺಡΈग़͠Λߦ͍·͢ɻI/F
্ͷσʔλ͸ɺ੍ޚίϚϯυɺ੍ޚσʔλɺಡΈग़͠σʔλͰߏ੒͞Ε·͢ɻσʔλͷૹ৴ଆ͸ɺSCLK pin ↓
Ͱ֤ϏοτΛग़ྗ͠ɺड৴ଆ͸ SCLK pin ↑ͰऔΓࠐΈ·͢ɻCSN pin ↓ͷޙɺ࠷ॳͷ 16bit ޚ੍͕ίϚϯυͰ
͢ɻॻ͖ࠐΈͷ৔߹͸ɺଓ͚ͯ 16bit ޚ੍σʔλΛॻ͖ࠐΈ·͢ɻಡΈग़͠৔߹͸ɺ16bit σʔλΛಡΈग़͠
·͢ɻͦͷޙͷ CSN pin ↑ͰҰճͷॻ͖ࠐΈ·ͨ͸ಡΈग़͠ಈ࡞Λऴྃ͠·͢ɻSCLK pin ͷΫϩοΫεϐʔ
υ͸ɺ5MHz(max)Ͱ͢ɻRESETN pin = “L”ͰϨδελ஋͸Ϧηοτ͞Ε·͢ɻ
ޚ੍ίϚϯυͷσʔλϑΥʔϚοτ͸ɺTable 2 ʹࣔ͠·͢ɻ੍ޚίϚϯυ͸ɺMSBଆͷ 8bit͕ɺλονεΫ
Ϧʔϯ੍ޚίϚϯυɺLSBଆ 8bit͕Keypad, GPIO, LEDً౓ௐ੔ϒϩοΫΛ੍͢ޚΔίϚϯυͰߏ੒͞Ε·͢ɻ
λονεΫϦʔϯ੍ޚΛߦ͏৔߹͸ɺԼҐ 8 Ϗοτ͸ɺ“0”Λॻ͖ࠐΜͰ͍ͩ͘͞ɻͦͷଞͷϒϩοΫΛ੍ޚ
͢Δ৔߹͸ɺ্Ґ 8 Ϗοτ͸ “0”Λॻ͖ࠐΜͰԼ͍͞ɻ
λονεΫϦʔϯ੍͢ޚΔ৔߹ S bit ͸ඞͣ “1”Λઃఆ͠·͢ɻ࣍ͷ 3 ϏοτͰɺλονεΫϦʔϯଌఆ࣠ٴ
ͼύϫʔμ΢ϯͷ੍ޚΛߦ͍·͢ɻ
ͦͷଞͷϒϩοΫΛ੍͢ޚΔ৔߹͸ɺόε্ͷσʔλͷํ޲Λࣔ͢W/R bitͰ࢝·Γ·͢ɻ࣍ͷ 1bit͸ɺΞΫ
ηε͢ΔϨδελͷϖʔδΛબ୒͢ΔPAGE bitͰ͢ɻબ୒͢ΔϖʔδϏοτ͸ Table 3 ʹࣔ͠·͢ɻ࣍ͷ 6bit
ͰΞΫηε͢ΔϨδελͷΞυϨεΛબ୒͠·͢ɻΞΫηε͢ΔϖʔδͱΞυϨε͸ɺTable 4 Λࢀরͩ͘͞
͍ɻ
MS0947-J-00
-14-
2008/04