WM8945
Production Data
REFER TO
REGISTER
ADDRESS
BIT
10
9
LABEL
DEFAULT
DESCRIPTION
initiate a set of conversion; the bit is reset automatically.
Enables Z-axis touch panel measurements.
0 = Disabled
TCH_Z_ENA
TCH_Y_ENA
TCH_X_ENA
0
0
1 = Enabled
Enables Y-axis touch panel measurements
0 = Disabled
1 = Enabled
Enables X-axis touch panel measurements
0 = Disabled
8
0
1 = Enabled
Settling time between X, Y and Z measurements.
(Nominal timing only; typically +/-20% of quoted
values.)
7:5
TCH_DELAY
[2:0]
000
000 = 30us
001 = 60us
010 = 120us
011 = 240us
100 = 480us
101 = 960us
110 = 1920us
111 = 3840us
Touch Panel Rate
0_0000 = Manual conversion
0_0001 = 16kHz
0_0010 = 32kHz
…(16kHz steps)
1_1111 = 496kHz
4:0
TCH_RATE
[4:0]
0_0000
Register 37h Touch Control 1
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
REFER TO
R56 (38h)
Touch
11
TCH_PDONLY
0
Select Automatic conversions only when Pen Down is
detected. (No effect on Manual conversion.)
Control 2
0 = Normal
1 = Pen-Down only
Pressure measurement current select
0 = 230uA
8
TCH_ISEL
0
1 = 460uA
Pen-Down sensitivity (pull-up resistor)
0000 = 64k (most sensitive)
0001 = 64k / 2
3:0
TCH_RPU[3:0]
0111
0010 = 64k / 3
0011 = 64k / 4
….
1111 = 64k / 16 (least sensitive)
Register 38h Touch Control 2
PD, May 2011, Rev 4.1
140
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
