AK4645AEZ Datasheet, PDF (60/85 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP

[AK4645A]
(2) I²CόείϯτϩʔϧϞʔυ (I2C pin = “H”)
AK4645AÍ·I²CόεϞʔυͷϑΥʔϚοτ͸ɺߴ଎Ϟʔυ(max:400kHz)ʹରԠ͍ͯ͠·͢ɻSDA, SCL pinsÍ·
ϓϧΞοϓ఍߅ͷ઀ଓઌ͸(TVDD+0.3)VҎԼʹͯ͠Լ͍͞ɻ
(2)-1. WRITE໋ྩ
I²CόεϞʔυʹ͓͚Δσʔλॻ͖ࠐΈγʔέϯε͸Figure 58ʹࣔ͞Ε·͢ɻόε্ͷIC΁ͷΞΫηεʹ͸ɺ
࠷ॳʹ։࢝৚݅(Start Condition)Λೖྗ͠·͢ɻSCLϥΠϯ͕ “H”ͷ࣌ʹSDAϥΠϯΛ “H”͔Β “L”ʹ͢Δͱɺ
։࢝৚͕݅࡞ΒΕ·͢(Figure 64)ɻ։࢝৚݅ͷޙɺεϨʔϒΞυϨε͕ૹ৴͞Ε·͢ɻ͜ͷΞυϨε͸7Ϗο
τ͔Βߏ੒͞Εɺ8Ϗοτ໨ʹ͸σʔλํ޲Ϗοτ(R/W)͕ଓ͖·͢ɻ্Ґ6Ϗοτ͸ “001001”ݻఆɺ࣍ͷ1
Ϗοτ͸ΞΫηε͢ΔICΛબͿͨΊͷΞυϨεϏοτͰɺCAD0 pinʹΑΓઃఆ͞Ε·͢(Figure 59)ɻΞυϨ
ε͕Ұகͨ͠৔߹ɺAK4645A͸֬ೝԠ౴(Acknowledge)Λੜ੒͠ɺ໋ྩ͕࣮ߦ͞Ε·͢ɻϚελ͸֬ೝԠ౴
༻ͷΫϩοΫύϧεΛੜ੒͠ɺSDAϥΠϯΛղ์͠ͳ͚Ε͹ͳΓ·ͤΜ(Figure 65)ɻR/W bit͕ “0”ͷ৔߹͸
σʔλॻ͖ࠐΈɺR/W bit͕ “1”ͷ৔߹͸σʔλಡΈग़͠Λߦ͍·͢ɻ
ୈ2όΠτ͸αϒΞυϨε(ϨδελΞυϨε)Ͱ͢ɻαϒΞυϨε͸8ϏοτɺMSB firstͰߏ੒͞Εɺ্Ґ2
Ϗοτ͸ “0”ݻఆͰ͢(Figure 60)ɻୈ3όΠτҎ߱͸ίϯτϩʔϧσʔλͰ͢ɻίϯτϩʔϧσʔλ͸8Ϗοτɺ
MSB firstͰߏ੒͞Ε·͢(Figure 61)ɻAK4645A͸ɺ֤όΠτͷड৴Λྃ͢׬Δͨͼʹ֬ೝԠ౴Λੜ੒͠·͢ɻ
σʔλసૹ͸ɺඞͣϚελ͕ੜ੒͢Δఀࢭ৚݅(Stop Condition)ʹΑͬͯऴྃ͠·͢ɻSCLϥΠϯ͕ “H”ͷ࣌
ʹSDAϥΠϯΛ “L”͔Β “H”ʹ͢Δͱɺఀࢭ৚͕݅࡞ΒΕ·͢(Figure 64)ɻ
AK4645A͸ෳ਺ͷόΠτͷσʔλΛҰ౓ʹॻ͖ࠐΉ͜ͱ͕Ͱ͖·͢ɻσʔλΛ1όΠτૹͬͨޙɺఀࢭ৚݅
ΛૹΒͣߋʹσʔλΛૹΔͱɺαϒΞυϨε͕ࣗಈతʹΠϯΫϦϝϯτ͞Εɺ࣍ͷσʔλ͸࣍ͷαϒΞυϨ
εʹ֨ೲ͞Ε·͢ɻΞυϨε “24H”ʹσʔλΛॻ͖ࠐΜͩޙɺ͞Βʹ࣍ͷΞυϨεʹॻ͖ࠐΜͩ৔߹ʹ͸Ξ
υϨε“00H”ʹσʔλ͕ॻ͖ࠐ·Ε·͢ɻ
ΫϩοΫ͕ “H”ͷؒ͸ɺSDAϥΠϯͷঢ়ଶ͸ҰఆͰͳ͚Ε͹ͳΓ·ͤΜɻσʔλϥΠϯ͕ “H”ͱ “L”ͷؒͰ
ঢ়ଶΛมߋͰ͖Δͷ͸ɺSCLϥΠϯͷΫϩοΫ৴߸͕ “L”ͷ࣌ʹݶΒΕ·͢(Figure 66)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 58. I²CόεϞʔυͷσʔλసૹγʔέϯε
0
0
1
0
0
1 CAD0 R/W
(CAD0͸ϐϯʹΑΓઃఆ)
Figure 59. ୈ1όΠτͷߏ੒
0
0
A5
A4
A3
A2
A1
A0
Figure 60. ୈ2όΠτͷߏ੒
D7
D6
D5
D4
D3
D2
D1
D0
Figure 61. ୈ3όΠτҎ߱ͷߏ੒
MS0986-J-00
- 60 -
2008/07