AK7755EN_16 Datasheet, PDF (54/109 Pages) Asahi Kasei Microsystems – DSP with Mono ADC Stereo CODEC + Mic/Lineout Amp

[AK7755]
TVDD, AVDD
DVDD
PDN(pin)
(1)
XTI(pin)
I2CSEL(pin)
EXTEEP(pin)
SDA(pin) (EEPROM→AK7755)
Clock Stabilization(12.288MHz)
(2)
CONT Reg. Setting, DSP Program
EEST(pin)
STO(pin)
CKRESETN bit (Reg.)
DSPRESETN bit(Reg.)
CRESETN bit(Reg.)
Success
Error
Power OFF
600ns(min) 1ms(min)
Figure 26. Power-up Sequence 3
(With External Power Supply (LDOE pin = “L”), Downloading from EEPROM (1)(2))
(1) Start Downloading by PDN pin
Power ON (AVDD, TVDD), I2CSEL pin=“H”, EXTEEP pin=“H”→ (DVDD→), PDN pin=“L”→“H”
(2) Start Downloading EXTEEP pin (Dotted Line)
Power ON (AVDD, TVDD), I2CSEL pin = “H” → (DVDD→), PDN pin = “L” → “H”
→ EXTEEP pin = “L” → “H”
TVDD, AVDD
DVDD
PDN(pin)
XTI(pin)
I2CSEL(pin)
DLS bit
SDA(pin)
EEST(pin)
STO(pin)
CKRESETN bit (Reg.)
DSPRESETN bit(Reg.)
CRESETN bit(Reg.)
(1)
Clock Stabilization(12.288MHz)
(3)
(uP→AK7755)
DLS=1
(EEPROM→AK7755)
CONT Reg. Setting, DSP Program
Success
Error
Power OFF
600ns(min) 1ms(min)
Figure 27. Power-up Sequence 4
(With External Power Supply (LDOE pin = “L”), Downloading from EEPROM (3))
(3) Start Downloading DLS bit
Power ON (AVDD, TVDD), I2CSEL pin=“H”→(DVDD→), PDN pin=“L”→“H” →DLS bit = “0”→“1”
014006643-E-00
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2014/10