wm9713 Wolfson Microelectronics plc, wm9713 Datasheet - Page 77

• Manufacturer Part Number: wm9713
• Description: Ac?97 Audio + Touchpanel Codec
• Manufacturer: Wolfson Microelectronics plc

Pre-Production
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Table 54 Maximum Delay Values
Setting DEL to ‘1111’ reduces the settling time to zero, i.e. measurements begin immediately. This
mode is intended for fast sampling on AUX inputs. It is NOT intended for touchpanel digitisation.
There are several side-effects when DEL is set to ‘1111’:
•
•
•
ADCSEL[1:7]
1 (if COO=1)
1 (if COO=1)
1 (if COO=1)
1 (if COO=1)
2,3,4,5,6,7,8
2,3,4,5,6,7,8
NUMBERS
2,3,4,5,6,7
(if COO=1)
2,3,4,5,6,7
(if COO=1)
(if COO=1)
(if COO=1)
BITS SET
Co-ordinate mode does not work, i.e. the WM9713L behaves as if COO = 0, even if
COO = 1 (see “Measurement Types”)
If X / Y co-ordinate or touch pressure measurements are selected (ADCSEL = 001, 010
or 011), then the switch matrix is constantly on, and current constantly flows in the
touchpanel. This increases power consumption in the system, and is therefore not
recommended for battery powered systems
In continuous mode (CTC = 1), setting DEL = 1111 increases the sampling rate of the
touchpanel ADC (see “Initiation of Measurements”)
5,6,7
5,6,7
5,6,7
5,6,7
3, 4
3, 4
3, 4
3, 4
OF
1
1
1
1
2
2
2
2
10 (153.75Hz)
10 (153.75Hz)
10 (153.75Hz)
10 (153.75Hz)
10 (153.75Hz)
10 (153.75Hz)
CR SETTING
00 (93.75Hz)
11 (187.5Hz)
00 (93.75Hz)
11 (187.5Hz)
00 (93.75Hz)
11 (187.5Hz)
00 (93.75Hz)
11 (187.5Hz)
00 (93.75Hz)
11 (187.5Hz)
00 (93.75Hz)
11 (187.5Hz)
01 (120Hz)
01 (120Hz)
01 (120Hz)
01 (120Hz)
01 (120Hz)
01 (120Hz)
MAX DELAY
SETTING
288
288
288
256
256
192
128
128
224
192
128
160
128
96
96
64
48
48
48
32
16
96
96
64
PP Rev 3.2 September 2008
WM9713L
77