AK8855 Datasheet, PDF (12/81 Pages) Asahi Kasei Microsystems – NTSC/PAL Digital Video Decoder

[ASAHI KASEI]
(5) Power-down Sequence , Reset Sequence after the power-down release
Activate reset for longer-than-512 clock time before setting PDN ( PDN to low ).
Activate reset after the PDN release ( PDN to high ).
CLKIN
•••••••••••
RSTN
sRES
hRES
PDN
GND
AK8855
VIH1, VIH2
VIL1, VIL2
VIH1, VIH2
Parameter
Symbol
Min.
Typ.
Max
Unit
RSTN pulse width
sRES
512
SYSCLK
time from PDN to high to RSTN
to high
hRES
10
msec
At power-down, all control signals must be surely connected to either the selected power supply or ground level,
and not to ViH / ViL levels.
When to turn off power supplies ( AVDD / DVDD ) other than PVDD, set the device into the power-down
condition after executing power-down sequence and then, the power should be turned off.
It is recommended to set all digital output pins to PVDD potential or set OE pin high, in power-down mode
setting.
note ) clock input is required for reset operation. During reset sequence, output pins become Hi-Z condition ( it
does not depend on OE pin state ).
Power-down release sequence when crystal resonator is connected, is shown as follows.
AVDD/DVDD
PVDD
PDN
RSTN
XTI
VCOM,VRN,VRP
time till the stable oscillation of
quartz crystal resonator, (not specified)
design target value 5 ms ( max ).
HRES => 10mS(min)
PDN Release
MS0319-E-03
12
2004 / 11