WM9713 datasheet(71/111 Pages) WOLFSON

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Preliminary Technical Data

WM9713L

PTD, March 2004, Rev 2.2

NUMBERS

ADCSEL[1:7]

BITS SET

CR SETTING

MAX DELAY

SETTING

00 (93.75Hz)

288

01 (120Hz)

288

10 (153.75Hz)

288

11 (187.5Hz)

256

00 (93.75Hz)

256

01 (120Hz)

192

10 (153.75Hz)

128

11 (187.5Hz)

128

3, 4

00 (93.75Hz)

3, 4

01 (120Hz)

3, 4

10 (153.75Hz)

3, 4

11 (187.5Hz)

5,6,7

00 (93.75Hz)

5,6,7

01 (120Hz)

5,6,7

10 (153.75Hz)

5,6,7

11 (187.5Hz)

1 (if COO=1)

00 (93.75Hz)

224

1 (if COO=1)

01 (120Hz)

192

1 (if COO=1)

10 (153.75Hz)

128

1 (if COO=1)

11 (187.5Hz)

2,3,4,5,6,7

(if COO=1)

00 (93.75Hz)

160

2,3,4,5,6,7

(if COO=1)

01 (120Hz)

128

2,3,4,5,6,7,8

(if COO=1)

10 (153.75Hz)

2,3,4,5,6,7,8

(if COO=1)

11 (187.5Hz)

Table 53 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’:

•

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”)

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