Production Data
WM8945
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
Touch Panel Enable
R55 (37h)
TCH_ENA
15
0
Touch Control
1
0 = Disabled
1 = Enabled
TCH_CVT_ENA
Touch Panel Conversion Enable
0 = Disabled
14
0
1 = Enabled
In automatic mode, conversions are
enabled by setting this bit.
In manual mode (TCH_RATE = 0),
setting this bit will initiate a set of
conversion; the bit is reset
automatically.
TCH_Z_ENA
TCH_Y_ENA
TCH_X_ENA
Enables Z-axis touch panel
measurements.
10
9
0
0
0 = Disabled
1 = Enabled
Enables Y-axis touch panel
measurements
0 = Disabled
1 = Enabled
Enables X-axis touch panel
measurements
8
0
0 = Disabled
1 = Enabled
TCH_DELAY
[2:0]
Settling time between X, Y and Z
measurements. (Nominal timing
only; typically +/-20% of quoted
values.)
7:5
000
000 = 30us
001 = 60us
010 = 120us
011 = 240us
100 = 480us
101 = 960us
110 = 1920us
111 = 3840us
TCH_RATE [4:0]
Touch Panel Rate
0_0000 = Manual conversion
0_0001 = 16kHz
0_0010 = 32kHz
…(16kHz steps)
1_1111 = 496kHz
4:0
0_0000
R56 (38h)
TCH_PDONLY
TCH_ISEL
Select Automatic conversions only
when Pen Down is detected. (No
effect on Manual conversion.)
11
8
0
0
Touch Control
2
0 = Normal
1 = Pen-Down only
Pressure measurement current
select
0 = 230uA
1 = 460uA
PD, May 2011, Rev 4.1
87
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
