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WM9712CLGEFL/V датащи(PDF) 45 Page - Wolfson Microelectronics plc

номер детали WM9712CLGEFL/V
подробное описание детали  AC??7 Audio and Touchpanel CODEC
PDF  78 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM9712CLGEFL/V датащи(HTML) 45 Page - Wolfson Microelectronics plc

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Production Data
WM9712L
w
PD, Rev 4.6, November 2011
45
If the SLEN bit is set to ‘1’, then the touchpanel data appears on the AC-Link slot selected by the SLT
control bits, as shown below. The Slot 0 ‘tag’ bit corresponding to the selected time slot is asserted
whenever there is new data on that slot.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
76h
3
SLEN
0
Slot Readback Enable
0: Disabled (readback through register only)
1: Enable (readback slot selected by SLT)
2:0
SLT
110
AC’97 Slot Selection for Touchpanel Data
000: Slot 5
001: Slot 6
…
101: Slot 10
110: Slot 11
111: RESERVED
Table 30 Returning Touchpanel Data through an AC-Link Time Slot
TOUCHPANEL SETTLING TIME
For accurate touchpanel measurements, some settling time may be required between the switch
matrix applying a voltage across the touchpanel plate and the ADC sampling the signal. This time
delay function is built into the WM9712L and can be programmed as shown below.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
76h
7:4
DEL
0000
(1 frame)
Touchpanel ADC Settling Time
Table 31 Touchpanel Settling Time Control (1)
DEL
DELAY
(AC-LINK FRAMES)
DELAY
(TIME)
0000
1
20.8
s
0001
2
41.7
s
0010
4
83.3
s
0011
8
167
s
0100
16
333
s
0101
32
667
s
0110
48
1ms
0111
64
1.33ms
1000
96
2ms
1001
128
2.67ms
1010
160
3.33ms
1011
192
4ms
1100
224
4.67ms
1101
256
5.33ms
1110
288
6ms
1111
No delay, switch matrix always on
Table 32 Touchpanel Settling Time Control (2)
The total time for co-ordinate or auxiliary measurements to complete is the delay time DEL, plus one
AC-Link frame (20.8
s). For a pressure measurement, the time taken is DEL plus two AC-Link frames
(41.6
s).



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