WM8753 Wolfson Microelectronics plc, WM8753 Datasheet - Page 71

• Manufacturer Part Number: WM8753
• Description: HI FI AND TELEPHONY DUAL CODEC
• Manufacturer: Wolfson Microelectronics plc

WM8753L
POWER MANAGEMENT
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Table 69 Power Management
R20 (14h)
Power
Management
(1)
R21 (15h)
Power
Management
(2)
R22 (16h)
Power
Management
(3)
R23 (17h)
Power
Management
(4)
Note: All control bits are 0=OFF, 1=ON
The WM8753L has three control registers that allow users to select which functions are active. For
minimum power consumption, unused functions should be disabled. To avoid any pop or click noise,
it is important to enable or disable functions in the correct order (see Applications Information).
VMIDSEL is the enable for the Vmid reference, which defaults to disabled and can be enabled as a
50k
500k potential divider.
SAVING POWER AT LOW SUPPLY VOLTAGES
The analogue supplies to the WM8753L can run from 1.8V to 3.6V. By default, all analogue circuitry
on the device is optimized to run at 3.3V. This set-up is also good for all other supply voltages down
to 1.8V. However, at lower voltages, it is possible to save power by reducing the internal bias currents
used in the analogue circuitry. This is controlled as shown below.
REGISTER
ADDRESS
potential divider or, for low power maintenance of Vref when all other blocks are disabled, as a
8:7
6
5
4
3
2
0
8
7
6
5
4
3
2
1
0
8
7
6
5
4
3
2
1
3
2
1
0
BIT
VMIDSEL
VREF
MICB
VDAC
DACL
DACR
DIGENB
MICAMP1EN
MICAMP2EN
ALCMIX
PGAL
PGAR
ADCL
ADCR
RXMIX
LINEMIX
LOUT1
ROUT1
LOUT2
ROUT2
OUT3
OUT4
MONO1
MONO2
RECMIX
MONOMIX
RIGHTMIX
LEFTMIX
LABEL
00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
DEFAULT
Vmid divider enable and select
00 – Vmid disabled (for OFF mode)
01 – 50k divider enabled (for
10 – 500k
11 – 5k divider enabled (for fast start-up)
VREF enable (necessary for all other
functions)
MIC Bias enable
Voice DAC enable
DAC Left enable
DAC Right enable
Disables MCLK into digital
Mic1 preamp enable
Mic2 preamp enable
ALC mixer enable
ADC left PGA enable
ADC right PGA enable
Left ADC enable
Right ADCR enable
RX mixer enable
Line mixer enable
LOUT1 enable
ROUT1 enable
LOUT2 enable
ROUT2 enable
OUT3 enable
OUT4 enable
MONO1 enable
MONO2 enable
Record Mixer Enable
Mono mixer enable
Right mixer enable
Left mixer enable
playback/record)
standby)
divider enabled (for low-power
DESCRIPTION
AI Rev 3.1 June 2004
Advanced Information
71