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AK4589 Datasheet, PDF (68/76 Pages) Asahi Kasei Microsystems – 2/8 CHANNEL AUDIO CODEC WITH DIR
ASAHI KASEI
[AK4589]
(2) I2CόείϯτϩʔϧϞʔυ (I2C pin = “H”)
AK4589ͷI2CόεϞʔυͷϑΥʔϚοτ͸ɺඪ४Ϟʔυ(max:100kHz)Ͱ͢ɻैͬͯߴ଎Ϟʔυ(max:400kHz)
ͷγεςϜ্Ͱ͸࢖༻Ͱ͖·ͤΜɻADC/DAC෦ͷϨδελ͸ϦʔυͰ͖·ͤΜɻ
(2)-1 σʔλసૹʹ͍ͭͯ
όε্ͷ̞̘΁ͷΞΫηεʹ͸ɺ࠷ॳʹελʔτ·ίϯσΟγϣϯΛೖྗ͠·͢ɻ࣍ʹɺ1όΠτͰߏ੒͞Ε
ΔσόΠεͷΞυϨεΛؚΜͩεϨʔϒ·ΞυϨεΛೖྗ͠·͢ɻ͜ͷ࣌ɺόε্ͷ̞̘͸͜ͷΞυϨεͱࣗ
෼ࣗ਎ͷΞυϨεΛൺֱ͠ɺΞυϨε͕Ұக̞̘ͨ͠͸ΞΫϊϦοδΛੜ੒͠·͢ɻΞυϨε͕Ұக̞ͨ͠
̘͸ɺ͜ͷޙREADຢ͸WRITEΛ࣮ߦ͠·͢ɻ໋ྩऴྃ࣌ʹ͸ɺετοϓ·ίϯσΟγϣϯΛೖྗͯ͠Լ͍͞ɻ
(2)-1-1. σʔλͷมߋ
SDAϥΠϯͷσʔλมߋ͸SCLϥΠϯ͕ “L”ͷؒʹߦͬͯԼ͍͞ɻΫϩοΫ͕ “H”ͷؒʹ͸SDAϥΠϯͷঢ়
ଶ͸ҰఆͰͳ͚Ε͹ͳΓ·ͤΜɻσʔλϥΠϯ͕ “H”ͱ “L”ͷؒͰঢ়ଶΛมߋͰ͖Δͷ͸SCLϥΠϯͷΫϩ
οΫ৴߸͕ “L”ͷ࣌ʹݶΒΕ·͢ɻSCLϥΠϯ͕ “H”ͷ࣌ʹSDAϥΠϯΛมߋ͢Δͷ͸ɺελʔτ·ίϯσΟ
γϣϯɺετοϓ·ίϯσΟγϣϯΛೖྗ͢Δͱ͖ͷΈͰ͢ɻ
SCL
SDA
DATA LINE
STABLE :
DATA VALID
CHANGE
OF DATA
ALLOWED
Figure 41. σʔλͷมߋ
(2)-1-2. ελʔτŋίϯσΟγϣϯͱετοϓŋίϯσΟγϣϯ
SCLϥΠϯ͕ “H”ͷ࣌ʹSDAϥΠϯΛ “H”͔Β “L”ʹ͢Δͱɺελʔτ·ίϯσΟγϣϯ͕࡞ΒΕ·͢ɻશͯ
ͷ໋ྩ͸ɺελʔτ·ίϯσΟγϣϯ͔Β࢝·Γ·͢ɻSCLϥΠϯ͕ “H”ͷ࣌ʹSDAϥΠϯΛ “L”͔Β “H”ʹ
͢Δͱɺετοϓ·ίϯσΟγϣϯ͕࡞ΒΕ·͢ɻશͯͷ໋ྩ͸ɺετοϓ·ίϯσΟγϣϯʹΑΓऴྃ͠·͢ɻ
SCL
SDA
START CONDITION
STOP CONDITION
Figure 42. ελʔτ·ίϯσΟγϣϯͱετοϓ·ίϯσΟγϣϯ
MS0339-J-00
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2004/09