wm9712l Wolfson Microelectronics plc, wm9712l Datasheet - Page 12

• Manufacturer Part Number: wm9712l
• Description: Ac?97 Audio And Touchpanel Codec
• Manufacturer: Wolfson Microelectronics plc

WM9712L
w
POWER CONSUMPTION
The power consumption of the WM9712L depends on the following factors.
•
•
Table 1 Supply Current Consumption
Notes:
1.
2.
Mode Description
OFF (lowest possible power)
Clocks stopped
LPS (Low Power Standby)
VREF maintained using 1MOhm string
Standby Mode (ready to playback)
VREF maintained using 50kOhm string
"Idle" Mode
VREF maintained using 50kOhm string
use LPS mode instead, if possible
Touchpanel only (waiting for pen-down)
AC-Link running
Touchpanel only (continuous conversion)
93.75 points per second
Phone Call - using headphone / ear speaker
HPOUTL, HPOUTR and OUT3 active
AC-Link stopped
Phone Call - using loudspeaker
AC-Link stopped
Record from mono microphone
with MICBIAS
all analogue outputs disabled
Record phone call
both sides mixed to mono
call using headphone / ear speaker
DAC Playback - using loudspeaker
DAC Playback - using headphone
DAC Playback - to Line-out
Maximum Power (everything on)
Supply voltages: Reducing the supply voltages also reduces digital supply currents, and therefore results in significant
power savings especially in the digital sections of the WM9712L.
Operating mode: Significant power savings can be achieved by always disabling parts of the WM9712L that are not
used (e.g. audio ADC, DAC, touchpanel digitiser).
All figures are at T
The power dissipated in the headphone, speaker and touchpanel is not included in the above table.
A
= +25
o
C, audio sample rate fs = 48kHz, with zero signal (quiescent).
0000000 0000000010001000 0Eh, bit 7 = 1
0000000 0000000000000000 0Eh, bit 7 = 1
1100111 0111111111111111
1101111 0111111111111111 76h = 0C00h
1001111 0111111111111111 76h = 0C00h
1110011 0111101100110100 0Eh, bit 7 = 1
0000001 0001110011110111
26h 14:8
1111111 0111111111111111 58h, SVD = 1
1111111 0111111111111111
1110111 0111111111111111
0110011 0111100010101100 0Eh, bit 7 = 1
1000110 0110101111111111 0Eh, bit 7 = 1
1000001 0001111101110111
0000001 0001110011101111
24h 15:0
Other Settings
78h = 0001h
78h = C001h
(mic gain boost)
(mic gain boost)
(mic gain boost)
(mic gain boost)
(mic gain boost)
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
V
AVDD
0.0005
0.0004
0.0003
I (mA)
0.005
0.004
0.003
0.241
0.508
0.009
0.027
1.838
1.218
2.385
1.837
1.218
1.838
9.461
5.318
2.549
1.738
1.748
1.748
9.593
5.388
0.05
0.56
0.37
0.76
0.02
0.08
0.04
2.36
3.27
2.66
7.46
3.45
3.62
2.71
3.62
2.71
7.37
1.1
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
V
DCVDD
I (mA)
1.301
0.883
0.571
3.922
11.21
12.22
8.552
5.799
9.884
6.755
4.606
4.606
4.606
12.26
8.563
5.85
2.87
7.78
5.21
6.78
6.78
9.8
9.8
5.8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
PD Rev 4.5 August 2006
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
V
DBVDD
Production Data
I (mA)
3.26
2.67
1.41
1.41
2.13
1.41
2.62
1.48
1.41
1.47
1.41
2.62
2.12
1.48
2.6
2.1
2.6
2.6
2.6
2.1
2.1
2.1
2.1
2.1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Total Power
0.00165
0.00054
15.2163
15.2244
80.1933
22.6746
52.5822
13.9572
14.0832
13.9752
80.7609
45.1325
22.8024
0.0165
0.0054
0.4338
0.9144
7.5075
15.155
7.7526
2.1924
7.8705
4.5925
2.1924
56.364
31.425
52.866
28.975
52.866
28.975
(mW)
0.001
1.848
0.925
3.582
28.38
7.788
4.595
45.28
28.51
0.01
3.63
1.9
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