wm9712l Wolfson Microelectronics plc, wm9712l Datasheet - Page 70

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

WM9712L
w
64h
76h
78h
7Ah
read
only
7Ch
7Eh
ADDR
ADDR
ADDR
Register 64h controls the input signal of the auxiliary DAC.
Registers 76h, 78h and 7Ah control the touchpanel interface.
Register 7Ch and 7Eh are read-only registers that indicate to the driver that the codec is a WM9712L.
REG
REG
REG
15
14:12
11:0
15
14:12
11
10
9:8
7:4
3
2:0
15:14
13
12
11
9
8
7:6
5:0
15
14:12
11:0
15:8
7:0
15:8
7:0
BIT
BIT
BIT
XSLE
AUXDACSLT
AUXDACVAL
POLL
ADCSEL
COO
CTC
CR
DEL
SLEN
SLT
PRP
RPR
45W
PDEN
WAIT
PIL
MSK
RPU
PNDN
ADCSRC
ADCD
F7:0
S7:0
T7:0
REV7:0
LABEL
LABEL
LABEL
57h
4Dh
4Ch
12h
DEFAULT
0
000 (none)
0 (OFF)
0 (polling)
00 (93.75Hz)
0000 (20.8µs)
1
10
00
0
0 (4-wire)
0 (always)
0
0 (200µA)
00 (OFF)
000001 (64kΩ)
0 (pen up)
000 (none)
000h
DEFAULT
0
000 (Slot 5)
000000000
DEFAULT
ASCII character “W” for Wolfson
ASCII character “M”
ASCII character “L”
12 for WM9712L
Selects input for AUXDAC. 0=from AUXDACVAL (for DC
signals), 1=from AC-Link slot (for AC signals)
Selects input slot for AUXDAC (with XSLE=1)
AUXDAC Digital Input for AUXDAC (with XSLE=0). 000h=
minimum, FFFh=full-scale
Writing “1” starts a measurement (this bit resets itself)
Selects measurement type
Enables co-ordinate mode
Enables continuous conversions
Controls conversion rate in continuous mode
Controls touchpanel settling time
Enables slot readback of touchpanel data
Selects time slot for readback of touchpanel data
Selects mode of operation. 00=OFF, 01=pen detect with
wake-up, 10=pen detect without wake-up, 11=running
Selects wake-up mode. 0=AC-Link only, 1=AC-Link and
WM9712L auto-wake-up
Selects 4-wire or 5-wire touchpanel
Selects when touchpanel measurements take place.
0=always, 1=only when pen is down
Controls data readback from register 7Ah. 0=overwrite old
data with new, 1=wait until old data has been read
Controls current used for pressure measurement. 1=400µA
Controls MASK feature
Controls internal pull-up resistor for pen-down detection
Indicates pen status.
Indicates measurement type
Returns data from touchpanel / AUXADC
DESCRIPTION
DESCRIPTION
DESCRIPTION
PD Rev 4.5 August 2006
Production Data
Auxiliary DAC
Intel’s AC’97
Component
Specification,
Revision 2.2,
page 50
REFER TO
REFER TO
Touchpanel
Interface
REFER TO
70