AK2303LV Datasheet, PDF (17/41 Pages) Asahi Kasei Microsystems – Dual PCM CODEC for PBX Analog Line Card

ASAHI KASEI
POWER DOWN
[AK2303LV]
Power consumption is reduced in the power down mode.
In the power down mode, the current fed to analog circuits and the clock for digital circuits, are stopped, and the
related circuits hold its current status.
There are two power down modes.
- Power down for all circuits
- Power down by block
* In the power down mode, the output pins of corresponding blocks turn to Hi-Z. (See page 5)
POWER DOWN MODE SETTING
2 power down modes -
Mode
Circuits Registers Operation for “0”/”1”
Note
All circuit
All
PD
”0” : Normal
”1” : Power down
Block
CODEC
CH0
CODEC
CH1
PDCH0
PDCH1
”0” : Normal
”1” : Power down
- CPU Registers are not reset.(hold its
value)
- Serial I/F is available.
- No need to supply FS, BCLK.
- Keep supplying FS and BCLK.
- AMPTn, AMPRn(n=0,1) Input/Output is
active, even when CODEC CHn(n=0,1) is in
power down mode,
Please refer table of the next page in
detail.
WAKE UP FROM POWER DOWN MODE
After power down mode for CODEC CH0/CH1 is cleared, the CODEC circuit starts to be initialized.
It takes 130mS(typ).
WAKE UP FROM FULL POWER DOWN MODE
When full circuit power down mode for CODEC is cleared, AK2303LV starts the same wake up sequence as
one at power on. It takes 250ms(typ).
2303-E-00
17
2001/09