WM9713L_06 WOLFSON [Wolfson Microelectronics plc], WM9713L_06 Datasheet - Page 80

• Manufacturer Part Number: WM9713L_06
• Description: AC 97 Audio + Touchpanel CODEC
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM9713L
ADDITIONAL POWER MANAGEMENT
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Table 66 Extended Power Down Register (2) (Additional to AC’97 Rev 2.2)
Note:
1.
Mixer output inverters: see “Mixer output Inverters” section. Inverters are OFF by default.
Touchpanel Interface: see “Controlling the Touchpanel Digitiser / Power Management”. The
touchpanel digitiser is OFF by default.
SLEEP MODE
Whenever the PR4 bit (reg. 26h) is set, the AC-Link interface is disabled, and the WM9713L is in
sleep mode. There is in fact a very large number of different sleep modes, depending on the other
control bits. For example, the low-power standby mode described below is a sleep mode. It is
desirable to use sleep modes whenever possible, as this will save power. The following functions do
not require a clock and can therefore operate in sleep mode:
The WM9713L can awake from sleep mode as a result of
3Eh
Powerdown
(2)
Note: When analogue inputs or outputs are disabled, they are internally connected to VREF
through a large resistor (VREF=AVDD/2 except when VREF and VMID1M are both OFF). This
maintains the potential at that node and helps to eliminate pops when the pins are re-enabled.
REGISTER
ADDRESS
When disabling a PGA, always ensure that it is muted first.
Analogue-to-analogue audio (DACs and ADCs unused), e.g. phone call mode
Pen-down detection
GPIO and interrupts
Battery alarm / analogue comparators
A warm reset on the AC-Link (according to the AC’97 specification)
A signal on a GPIO pin (if the pin is configured as an input, with wake-up enabled –
see “GPIO and Interrupt Control” section)
A virtual GPIO event such as pen-down, battery alarm, etc. (see “GPIO and
Interrupt Control” section)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
BIT
MCD
MICBIA
S
MONO
OUT4
OUT3
HPL
HPR
SPKL
SPKR
LL
LR
MOIN
MA
MB
MPA
MPB
LABEL
1 (OFF)
1 (OFF)
1 (OFF)
1 (OFF)
1 (OFF)
1 (OFF)
1 (OFF)
1 (OFF)
1 (OFF)
1 (OFF)
1 (OFF)
1 (OFF)
1 (OFF)
1 (OFF)
1 (OFF)
1 (OFF)
DEFAULT
Disables microphone current detect
Disables microphone bias
Disables MONO output PGA (see Note 1)
Disables OUT4 output PGA
Disables OUT3 output PGA
Disables HPL output PGA
Disables HPR output PGA
Disables SPKL output PGA
Disables SPKR output PGA
Disables LINEL PGA
Disables LINER PGA
Disables MONOIN PGA
Disables mic PGA MA
Disables mic PGA MB
Disables mic pre-amp MPA
Disables mic pre-amp MPB
DESCRIPTION
PP Rev 3.0 June 2006
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