AK4642VN Datasheet, PDF (53/82 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ Stereo CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4642]
(2) I²CόείϯτϩʔϧϞʔυ (I2C pin = “H”)
AK4642Í·I²CόεϞʔυͷϑΥʔϚοτ͸ɺߴ଎Ϟʔυ(max:400kHz, Ver 1.0)ʹରԠ͍ͯ͠·͢ɻ
(2)-1. WRITE໋ྩ
I²CόεϞʔυʹ͓͚Δσʔλॻ͖ࠐΈγʔέϯε͸Figure 36ʹࣔ͞Ε·͢ɻόε্ͷIC΁ͷΞΫηεʹ͸ɺ
࠷ॳʹ։࢝৚݅(Start Condition)Λೖྗ͠·͢ɻSCLϥΠϯ͕ “H”ͷ࣌ʹSDAϥΠϯΛ “H”͔Β “L”ʹ͢Δͱɺ
։࢝৚͕݅࡞ΒΕ·͢(Figure 42)ɻ։࢝৚݅ͷޙɺεϨʔϒΞυϨε͕ૹ৴͞Ε·͢ɻ͜ͷΞυϨε͸7Ϗο
τ͔Βߏ੒͞Εɺ8Ϗοτ໨ʹ͸σʔλํ޲Ϗοτ(R/W)͕ଓ͖·͢ɻ্Ґ5Ϗοτ͸ “001001”ݻఆɺ࣍ͷ1
Ϗοτ͸ΞΫηε͢ΔICΛબͿͨΊͷΞυϨεϏοτͰɺCAD0 pinʹΑΓઃఆ͞Ε·͢(Figure 37)ɻΞυϨ
ε͕Ұகͨ͠৔߹ɺAK4642͸֬ೝԠ౴(Acknowledge)Λੜ੒͠ɺ໋ྩ͕࣮ߦ͞Ε·͢ɻϚελ͸֬ೝԠ౴༻
ͷΫϩοΫύϧεΛੜ੒͠ɺSDAϥΠϯΛղ์͠ͳ͚Ε͹ͳΓ·ͤΜ(Figure 43)ɻR/W bit͕ “0”ͷ৔߹͸σ
ʔλॻ͖ࠐΈɺR/W bit͕ “1”ͷ৔߹͸σʔλಡΈग़͠Λߦ͍·͢ɻ
ୈ2όΠτ͸αϒΞυϨε(ϨδελΞυϨε)Ͱ͢ɻαϒΞυϨε͸8ϏοτɺMSB firstͰߏ੒͞Εɺ্Ґ3
Ϗοτ͸ “0”ݻఆͰ͢(Figure 38)ɻୈ3όΠτҎ߱͸ίϯτϩʔϧσʔλͰ͢ɻίϯτϩʔϧσʔλ͸8Ϗοτɺ
MSB firstͰߏ੒͞Ε·͢(Figure 39)ɻAK4642͸ɺ֤όΠτͷड৴Λྃ͢׬Δͨͼʹ֬ೝԠ౴Λੜ੒͠·͢ɻ
σʔλసૹ͸ɺඞͣϚελ͕ੜ੒͢Δఀࢭ৚݅(Stop Condition)ʹΑͬͯऴྃ͠·͢ɻSCLϥΠϯ͕ “H”ͷ࣌
ʹSDAϥΠϯΛ “L”͔Β “H”ʹ͢Δͱɺఀࢭ৚͕݅࡞ΒΕ·͢(Figure 42)ɻ
AK4642͸ෳ਺ͷόΠτͷσʔλΛҰ౓ʹॻ͖ࠐΉ͜ͱ͕Ͱ͖·͢ɻσʔλΛ1όΠτૹͬͨޙɺఀࢭ৚݅Λ
ૹΒͣߋʹσʔλΛૹΔͱɺαϒΞυϨε͕ࣗಈతʹΠϯΫϦϝϯτ͞Εɺ࣍ͷσʔλ͸࣍ͷαϒΞυϨε
ʹ֨ೲ͞Ε·͢ɻ
ΫϩοΫ͕ “H”ͷؒ͸ɺSDAϥΠϯͷঢ়ଶ͸ҰఆͰͳ͚Ε͹ͳΓ·ͤΜɻσʔλϥΠϯ͕ “H”ͱ “L”ͷؒͰ
ঢ়ଶΛมߋͰ͖Δͷ͸ɺSCLϥΠϯͷΫϩοΫ৴߸͕ “L”ͷ࣌ʹݶΒΕ·͢(Figure 44)ɻSCLϥΠϯ͕ “H”ͷ
࣌ʹSDAϥΠϯΛมߋ͢Δͷ͸ɺ։࢝৚݅ɺఀࢭ৚݅Λೖྗ͢Δͱ͖ͷΈͰ͢ɻ
S
T
S
A
R/W="0"
T
R
O
T
P
SDA
Slave
S _Address
Sub
Address(n)
Data(n)
Data(n+1)
Data(n+x)
P
A
A
A
A
A
A
C
C
C
C
C
C
K
K
K
K
K
K
Figure 36. I²CόεϞʔυͷσʔλసૹγʔέϯε
0
0
1
0
0
1 CAD0 R/W
(CAD0͸ϐϯʹΑΓઃఆ)
Figure 37. ୈ1όΠτͷߏ੒
0
0
0
A4
A3
A2
A1
A0
Figure 38. ୈ2όΠτͷߏ੒
D7
D6
D5
D4
D3
D2
D1
D0
Figure 39. ୈ3όΠτҎ߱ͷߏ੒
MS0358-J-02
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2005/04