WM9713 datasheet(66/111 Pages) WOLFSON

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WM9713L

Preliminary Technical Data

PTD, March 2004, Rev 2.2

MEASUREMENT TYPES

The ADCSEL control bits determine which type of measurement is performed (see below).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

POLL

Writing “1” initiates a measurement.

(when CTC is not set)

CTC

0: Polling mode

1: Continuous mode (for DMA)

ADCSEL_AUX4

Enable COMP1/AUX4 measurement

(pin32)

ADCSEL_AUX3

Enable COMP1/AUX3 measurement

(pin31)

ADCSEL_AUX2

Enable COMP1/AUX2 measurement

(pin30)

ADCSEL_AUX1

Enable COMP1/AUX1 measurement

(pin29)

ADCSEL_PRESSURE

Enable touchpanel pressure

measurement

ADCSEL_Y

Enable touchpanel Y co-ord

measurement

ADCSEL_X

Enable touchpanel X co-ord

measurement

74h

COO

Enable co-ordinate mode

0: Single measurement.

A single measurement is made

depending on the setting of

ADCSEL[7:1].

1: Co-ordinate measurement.

X, then Y, followed by an additional

measurement indicated by ADCSEL[7:1].

If more than one ADCSEL[7:1] bit is

selected then the third, additional,

measurement will alternate sequentially

between those selected.

Table 48 Touchpanel Digitiser Control (Measurement Types)

When COO is ‘0’, the WM9713L performs a single measurement – either in polling mode or

continuously, as indicated by the CTC bit.

The type of measurement is specified by the

ADCSEL[7:1] bits. If CTC=0 (polling mode) then only one of the ADCSEL[7:1] bits should be set.

If operating in continuous mode (CTC=1), then more than one ADCSEL[7:1] bit may be set and

selected

conversions

will

performed

cyclically

the

following

order

“X,Y,PRESSURE,AUX1,AUX2,AUX3,AUX4…”

The co-ordinate mode (COO = ‘1’) makes it easier to obtain co-ordinate pairs rather than single co-

ordinates. In polling-coordinate mode (CTC = ‘0’, COO = ‘1’), the WM9713L performs an X co-

ordinate, then a Y co-ordinate, followed by a single additional measurement determined by

ADCSEL[7:1], then stops. In continuous-coordinate mode (CTC = ‘1’, COO = ‘1’), the WM9713L

continuously repeats a sequence consisting of an X-co-ordinate,Y co-ordinate, then an additional

measurement determined by ADCSEL[7:1] (if ADCSEL = 000_0000, the sequence is XYXYXY…

only). Should more than one of the ADCSEL[7:1] bits be set during continuous co-ordinate mode

then the additional measurement alternates for every set of three measurements. For example if

ADCSEL_AUX1 and ADCSEL_AUX3 were both selected whilst CTC = ‘1’, COO = ‘1’ then the

following sequence of conversions would be performed

“X,Y,AUX1,X,Y,AUX3,X,Y,AUX1,X,Y,AUX3…”

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