WM9713LGEFL/RV Wolfson Microelectronics, WM9713LGEFL/RV Datasheet - Page 79

• Manufacturer Part Number: WM9713LGEFL/RV
• Description: Audio CODECs Stereo AC'97 CODEC T/P Interface
• Manufacturer: Wolfson Microelectronics

Specifications of WM9713LGEFL/RV

• Number Of Adc Inputs: 1
• Number Of Dac Outputs: 1
• Conversion Rate: 8 KSPs
• Interface Type: AC97
• Resolution: 12 bit
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-48
• Minimum Operating Temperature: - 25 C
• Number Of Channels: 1 ADC, 1 DAC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Pre-Production
ADDITIONAL FEATURES
AUXILIARY ADC INPUTS
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The ADC used for touchpanel digitisation can also be used for the sole purpose of auxiliary
measurements, provided that it is enabled (register 78h, PRP = 11). The WM9713L has three pins
that can be used as auxiliary ADC inputs:
Additionally, the speaker supply (SPKVDD) can be used as an auxiliary ADC input through an on-
chip potential divider giving an input to the auxiliary ADC of SPKVDD/3. This input is referred to as
the AUX3 input (see Figure 24).
Note that pin 12 connects to the wiper of a 5-wire touchpanel wiper function. Auxiliary measurements
taken on pin 12 are only meaningful when it is not connected to a touchpanel (i.e. a 4-wire
touchpanel, or no touchpanel at all, is used). Pins 29 and 30 are also used as comparator inputs (see
Battery Alarm and Battery Measurement), but auxiliary measurements can still be taken on these
pins at any time. The ADCSEL control bits select between different ADC inputs, as shown in Table
57.
The ADCSEL control bits determine which type of measurement is performed (see below). When
performing auxiliary conversions the co-ordinate mode bit, COO, should be off (0).
If CTC=0 then only one of the ADCSEL[7:1] bits should be set. If operating in continuous mode
(CTC=1), then more than one ADCSEL[7:1] bit may be set, and conversions will be performed
cyclically in the following order => “AUX1,AUX2,AUX3,AUX4…” – dependent on which bits are set.
Table 57 Auxiliary ADC Measurements
Auxiliary ADC measurements are initiated in the same way as touchpanel measurements, and the
data is returned in the same manner. Please refer to the “Controlling the Touchpanel Interface”
section.
74h
REGISTER
ADDRESS
•
•
•
MIC2A / COMP1 / AUX1 (pin 29)
MIC2B / COMP2 / AUX2 (pin 30)
WIPER / AUX4 (pin 12)
BIT
7
6
5
4
0
ADCSEL_AUX4
ADCSEL_AUX3
ADCSEL_AUX2
ADCSEL_AUX1
COO
LABEL
DEFAULT
0
0
0
0
0
AUX4 Measurement Enable Control
0 = Disable AUX4 measurement (pin 12)
1 = Enable AUX4 measurement (pin 12)
AUX3 Measurement Enable Control
0 = Disable AUX3 measurement
(SPKVDD/3)
1 = Enable AUX3 measurement (SPKVDD/3)
AUX2 Measurement Enable Control
0 = Disable AUX2 measurement (pin 30)
1 = Enable AUX2 measurement (pin 30)
AUX1 Measurement Enable Control
0 = Disable AUX1 measurement (pin 29)
1 = Enable AUX1 measurement (pin 29)
Co-ordinate Mode Control
0 = Single measurement
1 = Co-ordinate measurement
Note: When not measuring a touchpanel,
set COO=0
PP Rev 3.2 September 2008
DESCRIPTION
WM9713L
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