參數(shù)資料
型號(hào)： AK4544AVQ
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： CABLE ASSEMBLY; BNC MALE TO N MALE; 50 OHM, RG223/U COAX, DOUBLE SHIELDED; 36" CABLE LENGTH
中文描述： AC97多媒體音頻編解碼器與SRC
文件頁數(shù)： 26/35頁
文件大小： 381K
代理商： AK4544AVQ
[ASAHI KASEI] [AK4544A]
<MS0026-E-00> - 26 -
n
Power Management/Low Power Modes
The AK4544A is capable of operating at multiple reduced power modes for when no activity is required. The state of power down
is controlled by the Powerdown Register (26h). There are 8 separate commands for power down. See the table below for the
different modes. As the AK4544A operates at static mode, the registers will not lose their values even if the master clock is stopped
only upon power.
Powerdown Mode Truth Table
ADC
DAC
Mixer
VREF
ACLINK
Internal
CLK
don’t care
don’t care
don’t care
LNLVL_OU
T
don’t care
don’t care
PD
EAPD
PR0=”1”
PR1=”1”
PR2=”1”
PD
don’t care
PD
don’t care
(No DAC out)
PD
PD
PD
don’t care
don’t care
don’t care
don’t care
PD
don’t care
don’t care
don’t care
don’t care
don’t care
don’t care
don’t care
don’t care
don’t care
don’t care
don’t care
PR3=”1”
PR4=”1”
PR5=”1”
PR6=”1”
PR7=”1”
*: PD means Powerdown .
*: No DAC out means that there is no PCM out because mixer is disabled.
PD
PD
PD
PD
PD
don’t care
PD
PD
don’t care
don’t care
don’t care
don’t care
PD
don’t care
don’t care
PD
don’t care
don’t care
don’t care
don’t care
PD
don’t care
don’t care
don’t care
don’t care
don’t care
don’t care
don’t care
don’t care
don’t care
don’t care
PD
don’t care
don’t care
don’t care
From normal operation sequential writes to the Powerdown Register are performed to power down subsections of the AK4544A
one at a time. After everything has been shut off, a final write (of PR4) can be executed to shut down the AC ’97 digital interface
(AC-link). The part will remain in sleep mode with all its registers holding their static values. To wake up, the AC ‘97 controller will
send a pulse on the sync line issuing a warm reset. This will restart the AK4544A digital (resetting PR4 to zero). The AK4544A can
also be woken up with a cold reset. A cold reset will cause a loss of values of the registers as a cold reset will set them to their
default states. When a subsection is powered back on the Powerdown Control/Status register (index 26h) should be read to verify
that the section is ready (i.e. stable) before attempting any operation that requires its normal operation.
And the below figure illustrates one example of procedure to do a complete powerdown/power up of AK 4544A.
Normal
ADCs off
PR0
DACs off
PR1
Digital I/F
off
PR4
PR0=1
PR1=1
PR2=1
Shut off
AC-Link
Warm Reset
PR1=0
&
DAC=1
PR0=0
&
ADC=1
Analog
off
PR2 or
PR3
PR4=1
PR2=0
&
ANL=1
Default
Cold Reset
Ready = 1
One example of AK 4544A Powerdown/Powerup flow
When PR3 bit is set to “1”, ADC, DAC, Mixer, True Line Level Out, and VREF will be powered down even if any PRx
bit are “0”. When PR3 bit is reset to “0”, the AK4544A resumes with the previous state by referencing PRx bit. In this
case, the AK4544A outputs “0” (invalid) for corresponding slot-x valid bits in the slot 0 until the corresponding block
of the AK4544A is power-up.
Setting PR4 bit cause the Powerdown mode of AK 4544A and AC-Link of AK 4544A shut down. In this case, when
Warm Reset is executed, PR4 bit is cleared and the AC-Link is reactivated. Meanwhile Cold reset is selected,
AK 4544A is restored to operation with default register settings.
In addition, setting PR5 bit causes the Powerdown mode of AK 4544A and the internal clock of AK 4544A to be
stopped. When a warm reset is done in this case, PR5 bit is cleared to 0 and internal clock and AC-Link are
reactivated. When Cold reset is executed, AK 4544A is set up to the operation with default register setting, no
powerdown modes active.
The next figure illustrates a state when all the mixers should work with the static volume settings that are
contained in their associated registers. This is used when the user is playing a CD (or external LINE_IN source)
through the AC ‘97 codec to the speakers but has most of the system in a low power mode. The procedure for this
follows the previous except that the analog mixer is never shut down.
相關(guān)PDF資料
PDF描述
AK4544 AC97 MULTIMEDIA AUDIO CODEC WITH SRC
AK4545 AC97 AUDIO CODEC WITH SRC AND DIT
AK4545VQ AC97 AUDIO CODEC WITH SRC AND DIT
AK4551 LOW POWER & SMALL PACKAGE 20BIT CODEC
AK4551VT LOW POWER & SMALL PACKAGE 20BIT CODEC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AK4545 制造商:AKM 制造商全稱:AKM 功能描述:AC97 AUDIO CODEC WITH SRC AND DIT
AK4545VQ 制造商:AKM 制造商全稱:AKM 功能描述:AC97 AUDIO CODEC WITH SRC AND DIT
AK4550 制造商:AKM 制造商全稱:AKM 功能描述:EVALUATION BOARD REV.C FOR AK4550
AK4550VT 制造商:AKM 制造商全稱:AKM 功能描述:LOW POWER & SMALL PACKAGE 16BIT CODEC
AK4550VT-E2 制造商:Asahi Kasei Microsystems Co Ltd 功能描述:
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