WM9715L Datasheet, PDF (70/77 Pages) Wolfson Microelectronics plc – AC’97 Audio and Touchpanel CODEC

WM9715L
Registers 60h and 62h control the ALC and Noise Gate functions.
Production Data
REG
ADDR
60h
62h
BIT
15:12
11:8
7:4
3:0
15:14
13:11
10:9
8
7
5
4:0
LABEL
ALCL
HLD
DCY
ATK
ALCSEL
MAXGAIN
ZC TIMEOUT
ALCZC
NGAT
NGG
NGTH
DEFAULT
DESCRIPTION
1011 (-12dB)
0000 (0 ms)
0011 (192 ms)
0010 (24 ms)
00 (OFF)
111 (+30dB)
11 (slowest)
0 (OFF)
0 (OFF)
0 (hold gain)
00000 (-76.5dB)
Controls ALC threshold
Controls ALC hold time
Controls ALC decay time
Controls ALC attack time
Controls which channel ALC operates on. 00=none,
01=right only, 10=left only, 11=both
Controls upper gain limit for ALC
Controls time-out for zero-cross detection
Enables zero-cross detection for ALC
Enables noise gate function
Selects noise gate type. 0=hold gain, 1=mute
Controls noise gate threshold
REFER TO
Audio ADC,
Automatic
Level Control
Register 64h controls the input signal of the auxiliary DAC.
REG
ADDR
64h
BIT
15
14:12
11:0
LABEL
XSLE
AUXDACSLT
AUXDACVAL
DEFAULT
0
000 (Slot 5)
000000000
DESCRIPTION
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
REFER TO
Auxiliary DAC
Registers 76h, 78h and 7Ah control the touchpanel interface.
REG
ADDR
76h
78h
BIT
15
14:12
11
10
9:8
7:4
3
2:0
15:14
13
12
11
9
7Ah
read
only
8
5:0
15
14:12
11:0
LABEL
POLL
ADCSEL
COO
CTC
CR
DEL
SLEN
SLT
PRP
RPR
45W
PDEN
WAIT
PIL
RPU
PNDN
ADCSRC
ADCD
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)
000001 (68kΩ)
0 (pen up)
000 (none)
000h
DESCRIPTION
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
WM9715L 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 internal pull-up resistor for pen-down detection
Indicates pen status.
Indicates measurement type
Returns data from touchpanel / AUXADC
REFER TO
Touchpanel
Interface
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PD Rev 4.0 December 2007
70