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WM8948 Datasheet(PDF) 94 Page - Wolfson Microelectronics plc |
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WM8948 Datasheet(HTML) 94 Page - Wolfson Microelectronics plc |
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94 / 189 page  WM8948 Production Data w PD, May 2011, Rev 4.1 94 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 9 TCH_Y_ENA 0 Enables Y-axis touch panel measurements 0 = Disabled 1 = Enabled 8 TCH_X_ENA 0 Enables X-axis touch panel measurements 0 = Disabled 1 = Enabled 7:5 TCH_DELAY [2:0] 000 Settling time between X, Y and Z measurements. (Nominal timing only; typically +/-20% of quoted values.) 000 = 30us 001 = 60us 010 = 120us 011 = 240us 100 = 480us 101 = 960us 110 = 1920us 111 = 3840us 4:0 TCH_RATE [4:0] 0_0000 Touch Panel Rate 0_0000 = Manual conversion 0_0001 = 16kHz 0_0010 = 32kHz …(16kHz steps) 1_1111 = 496kHz R56 (38h) Touch Control 2 11 TCH_PDONLY 0 Select Automatic conversions only when Pen Down is detected. (No effect on Manual conversion.) 0 = Normal 1 = Pen-Down only 8 TCH_ISEL 0 Pressure measurement current select 0 = 230uA 1 = 460uA 3:0 TCH_RPU [3:0] 0111 Pen-Down sensitivity (pull-up resistor) 0000 = 64k (most sensitive) 0001 = 64k / 2 0010 = 64k / 3 0011 = 64k / 4 …. 1111 = 64k / 16 (least sensitive) Table 60 Touch Panel Control TOUCH PANEL READBACK Measured data from the Touch Panel controller is read via the Touch Data registers. The X-axis, Y- axis and Z-axis (pressure) measurements are provided in the TCH_X, TCH_Y and TCH_Z registers respectively. The TCH_PD1, TCH_PD2 and TCH_PD3 bits indicate whether the Pen Down status was asserted when the measurement set was made. To read a set of Touch Panel measurements, the host processor must access each of the applicable Touch Data registers. When the host processor starts to read these registers, the WM8948 will inhibit any new touch panel measurements until the host processor has read all of the applicable registers. This ensures that the data read by the host processor all relates to the same set of measurements. |
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