WM9712CLGEFLSLASHV datasheet(12/78 Pages) WOLFSON

12 / 78 page

WM9712L

Production Data

PD, Rev 4.6, November 2011

POWER CONSUMPTION

The power consumption of the WM9712L depends on the following factors.



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).

Mode Description

26h 14:8

24h 15:0

Other Settings

Total Power

VI (mA)

(mW)

OFF (lowest possible power)

1111111 0111111111111111 58h, SVD = 1

3.3

0.0005

3.3

0.00165

Clocks stopped

2.5

0.0004

2.5

0.001

1.8

0.0003

1.8

0.00054

LPS (Low Power Standby)

1111111 0111111111111111

3.3

0.005

3.3

0.0165

VREF maintained using 1MOhm string

2.5

0.004

2.5

0.01

1.8

0.003

1.8

0.0054

Standby Mode (ready to playback)

1110111 0111111111111111

3.3

0.56

3.3

1.848

VREF maintained using 50kOhm string

2.5

0.37

2.5

0.925

1.8

0.241

1.8

0.4338

"Idle" Mode

1100111 0111111111111111

3.3

1.1

3.3

3.63

VREF maintained using 50kOhm string

2.5

0.76

2.5

1.9

use LPS mode instead, if possible

1.8

0.508

1.8

0.9144

Touchpanel only (waiting for pen-down)

1101111 0111111111111111 76h = 0C00h

3.3

0.05

3.3

1.301

3.3

3.26

15.2163

AC-Link running

78h = 0001h

2.5

0.02

2.5

0.883

2.5

2.1

7.5075

1.8

0.009

1.8

0.571

1.8

1.41

3.582

Touchpanel only (continuous conversion)

1001111 0111111111111111 76h = 0C00h

3.3

0.08

3.3

5.85

3.3

2.67

28.38

93.75 points per second

78h = C001h

2.5

0.04

2.5

3.922

2.5

2.1

15.155

1.8

0.027

1.8

2.87

1.8

1.41

7.7526

Phone Call - using headphone / ear speaker

0110011 0111100010101100 0Eh, bit 7 = 1

3.3

2.36

3.3

7.788

HPOUTL, HPOUTR and OUT3 active

(mic gain boost)

2.5

1.838

2.5

4.595

AC-Link stopped

1.8

1.218

1.8

2.1924

Phone Call - using loudspeaker

1110011 0111101100110100 0Eh, bit 7 = 1

3.3

2.385

3.3

7.8705

AC-Link stopped

(mic gain boost)

2.5

1.837

2.5

4.5925

1.8

1.218

1.8

2.1924

Record from mono microphone

1000110 0110101111111111 0Eh, bit 7 = 1

3.3

3.27

3.3

11.21

3.3

2.6

56.364

with MICBIAS

(mic gain boost)

2.5

2.66

2.5

7.78

2.5

2.13

31.425

all analogue outputs disabled

1.8

1.838

1.8

5.21

1.8

1.41

15.2244

Record phone call

0000000 0000000010001000 0Eh, bit 7 = 1

3.3

9.461

3.3

12.22

3.3

2.62

80.1933

both sides mixed to mono

(mic gain boost)

2.5

7.46

2.5

8.552

2.5

2.1

45.28

call using headphone / ear speaker

1.8

5.318

1.8

5.799

1.8

1.48

22.6746

DAC Playback - using loudspeaker

1000001 0001111101110111

3.3

3.45

3.3

9.884

3.3

2.6

52.5822

2.5

2.549

2.5

6.755

2.5

2.1

28.51

1.8

1.738

1.8

4.606

1.8

1.41

13.9572

DAC Playback - using headphone

0000001 0001110011101111

3.3

3.62

3.3

9.8

3.3

2.6

52.866

2.5

2.71

2.5

6.78

2.5

2.1

28.975

1.8

1.748

1.8

4.606

1.8

1.47

14.0832

DAC Playback - to Line-out

0000001 0001110011110111

3.3

3.62

3.3

9.8

3.3

2.6

52.866

2.5

2.71

2.5

6.78

2.5

2.1

28.975

1.8

1.748

1.8

4.606

1.8

1.41

13.9752

Maximum Power (everything on)

0000000 0000000000000000 0Eh, bit 7 = 1

3.3

9.593

3.3

12.26

3.3

2.62

80.7609

(mic gain boost)

2.5

7.37

2.5

8.563

2.5

2.12

45.1325

1.8

5.388

1.8

5.8

1.8

1.48

22.8024

AVDD

DCVDD

DBVDD

Table 1 Supply Current Consumption

Notes:

All figures are at TA = +25

oC, audio sample rate fs = 48kHz, with zero signal (quiescent).

The power dissipated in the headphone, speaker and touchpanel is not included in the above table.

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