AK2306 Datasheet, PDF (16/38 Pages) Asahi Kasei Microsystems – Dual PCM CODEC for ISDN/VoIP TERMINAL ADAPTER

ASAHI KASEI
[AK2306/LV]
POWER DOWN
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
relating circuits hold its 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 except TNOUT pin.(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
- CPU Registers are not reset.
- Serial I/F is available.
- No need to supply FS, BCLK.
CODEC
CH0
PDCH0
Block
CODEC
CH1
PDCH1
”0” : Normal
”1” : Power down
RING
TONEGEN
PDTN
- Keep supplying FS, even when CODEC
CH0,1 are in power down mode (see
page10,11).
- When CODEC CHn(n=0,1) is in power
down mode, the functions below are active:
(1) AMPTn(n=0,1) Input/Output
(2) TNOUT Output
Please refer next page table in deltail.
CANCELLATION OF POWER DOWN : CODEC
When power down mode for CODEC CH0/CH1 is cleared, the CODEC circuitry starts to be initialized.
It takes 130mS(typ.).
When full circuit power down mode for CODEC is cleared, AK2306/LV starts the same wake up sequence as
one at power on. It takes 250ms(Typ)
Wake up time for Tone generator is 125us(Typ).
MS0093-E-04
16
2001/11