AK4612EQ Datasheet, PDF (51/68 Pages) Asahi Kasei Microsystems – 6/8-Channel Audio CODEC

[AK4612]
(2) I²CόείϯτϩʔϧϞʔυ (I2C pin = “H”)
AK4612Í·I²CόεϞʔυͷϑΥʔϚοτ͸ɺߴ଎Ϟʔυ(max:400kHz)ʹରԠ͍ͯ͠·͢ɻ


(2)-1. WRITE໋ྩ
I²CόεϞʔυʹ͓͚Δσʔλॻ͖ࠐΈγʔέϯε͸Figure 50ʹࣔ͞Ε·͢ɻόε্ͷIC΁ͷΞΫηεʹ͸ɺ
࠷ॳʹ։࢝৚݅ (Start Condition) Λೖྗ͠·͢ɻSCLϥΠϯ͕ “H”ͷ࣌ʹSDAϥΠϯΛ “H”͔Β “L”ʹ͢Δͱɺ
։࢝৚͕݅࡞ΒΕ·͢(Figure 56)ɻ։࢝৚݅ͷޙɺεϨʔϒΞυϨε͕ૹ৴͞Ε·͢ɻ͜ͷΞυϨε͸7Ϗο
τ͔Βߏ੒͞Εɺ8Ϗοτ໨ʹ͸σʔλํ޲Ϗοτ(R/W) ͕ଓ͖·͢ɻ্Ґ5Ϗοτ͸ “00100”ݻఆɺ࣍ͷ2Ϗ
οτ͸ΞΫηε͢ΔICΛબͿͨΊͷΞυϨεϏοτͰɺCAD1, CAD0 pinʹΑΓઃఆ͞Ε·͢(Figure 51)ɻΞ
υϨε͕Ұகͨ͠৔߹ɺAK4612͸֬ೝԠ౴ (Acknowledge) Λੜ੒͠ɺ໋ྩ͕࣮ߦ͞Ε·͢ɻϚελ͸֬ೝԠ
౴༻ͷΫϩοΫύϧεΛੜ੒͠ɺSDAϥΠϯΛղ์͠ͳ͚Ε͹ͳΓ·ͤΜ(Figure 57)ɻR/W bit͕ “0”ͷ৔߹͸
σʔλॻ͖ࠐΈɺR/W bit͕ “1”ͷ৔߹͸σʔλಡΈग़͠Λߦ͍·͢ɻ
ୈ2όΠτ͸αϒΞυϨε(ϨδελΞυϨε)Ͱ͢ɻαϒΞυϨε͸8ϏοτɺMSB firstͰߏ੒͞Εɺ্Ґ3Ϗ
οτ͸ “0”ݻఆͰ͢(Figure 52)ɻୈ3όΠτҎ߱͸ίϯτϩʔϧσʔλͰ͢ɻίϯτϩʔϧσʔλ͸8Ϗοτɺ
MSB firstͰߏ੒͞Ε·͢(Figure 53)ɻAK4612͸ɺ֤όΠτͷड৴Λྃ͢׬Δͨͼʹ֬ೝԠ౴Λੜ੒͠·͢ɻ
σʔλసૹ͸ɺඞͣϚελ͕ੜ੒͢Δఀࢭ৚݅ (Stop Condition) ʹΑͬͯऴྃ͠·͢ɻSCLϥΠϯ͕ “H”ͷ࣌
ʹSDAϥΠϯΛ “L”͔Β “H”ʹ͢Δͱɺఀࢭ৚͕݅࡞ΒΕ·͢(Figure 56)ɻ
AK4612͸ෳ਺ͷόΠτͷσʔλΛҰ౓ʹॻ͖ࠐΉ͜ͱ͕Ͱ͖·͢ɻσʔλΛ1όΠτૹͬͨޙɺఀࢭ৚݅Λ
ૹΒͣߋʹσʔλΛૹΔͱɺαϒΞυϨε͕ࣗಈతʹΠϯΫϦϝϯτ͞Εɺ࣍ͷσʔλ͸࣍ͷαϒΞυϨε
ʹ֨ೲ͞Ε·͢ɻΞυϨε “16H”ʹσʔλΛॻ͖ࠐΜͩޙɺ͞Βʹ࣍ͷΞυϨεʹॻ͖ࠐΜͩ৔߹ʹ͸Ξυ
Ϩε“00H”ʹσʔλ͕ॻ͖ࠐ·Ε·͢ɻ
ΫϩοΫ͕ “H”ͷؒ͸ɺSDAϥΠϯͷঢ়ଶ͸ҰఆͰͳ͚Ε͹ͳΓ·ͤΜɻσʔλϥΠϯ͕ “H”ͱ “L”ͷؒͰঢ়
ଶΛมߋͰ͖Δͷ͸ɺSCLϥΠϯͷΫϩοΫ৴߸͕ “L”ͷ࣌ʹݶΒΕ·͢(Figure 58)ɻSCLϥΠϯ͕ “H”ͷ࣌ʹ
SDAϥΠϯΛมߋ͢Δͷ͸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 50. I²CόεϞʔυͷσʔλసૹγʔέϯε
0
0
1
0
0 CAD1 CAD0 R/W
(CAD1,CAD0͸ pinʹΑΓઃఆ)
Figure 51. ୈ1όΠτͷߏ੒
0
0
0
A4
A3
A2
A1
A0
Figure 52. ୈ2όΠτͷߏ੒
D7
D6
D5
D4
D3
D2
D1
D0
Figure 53. ୈ3όΠτҎ߱ͷߏ੒
MS1039-J-01
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2009/06