TSC2000IPWR datasheet(18/34 Pages) TI

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TSC2000

SBAS257

MSB

LSB

BIT 15

BIT 14

BIT 13

BIT 12

BIT 11

BIT 10

BIT 9

BIT 8

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

TABLE XXIV. Reset Register.

MSB

LSB

BIT 15

BIT 14

BIT 13

BIT 12

BIT 11

BIT 10

BIT 9

BIT 8

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

TABLE XXVI. D/A Converter Register.

RESET REGISTER

(PAGE 1, ADDRESS 04H)

The TSC2000 has a special register, the RESET register, which

allows a software reset of the device. Writing the code BBXXH,

as shown in Table XXIV, to this register will cause the TSC2000

to reset all its registers to their default, power-up values.

Writing any other values to this register will do nothing.

Reading this register or any reserved register will result in

reading back all 1’s, or FFFFH.

TSC2000 DATA REGISTERS

The data registers of the TSC2000 hold data results from

conversions or keypad scans, or the value of the D/A converter

output current. All of these registers default to 0000H upon reset,

except the D/A converter register, which is set to 0080H,

representing the midscale output of the D/A converter.

X, Y, Z1, Z2, BAT1, BAT2, AUX1, AUX2, TEMP1,

AND TEMP2 REGISTERS

The results of all A/D conversions are placed in the appropri-

ate data register, see Tables III and VIII. The data format of

the result word, R, of these registers is right-justified, as

shown in Table XXV.

D/A CONVERTER DATA REGISTER

(PAGE 0, ADDRESS 0BH)

The data to be written to the D/A converter is written into the

D/A converter data register, which is formatted as shown in

Table XXVI.

ZERO REGISTER

(PAGE 0, ADDRESS 10H)

This is a reserved data register, but instead of reading all 1’s

(FFFFH), when read will return all 0’s (0000H).

OPERATION—TOUCH SCREEN MEASUREMENTS

As noted previously in the discussion of the A/D converter,

several operating modes can be used, which allow great

flexibility for the host processor. These different modes will

now be examined.

Conversion Controlled by TSC2000 Initiated at

Touch Detect

In this mode, the TSC2000 will detect when the touch panel is

touched and cause the PENIRQ line to go LOW. At the same

time, the TSC2000 will start up its internal clock. It will then turn

on the Y-drivers, and after a programmed Panel Voltage

Stabilization time, power up the A/D converter and convert the

Y-coordinate. If averaging is selected, several conversions

may take place; when data averaging is complete, the Y-

coordinate result will be stored in the Y-register.

If the screen is still touched at this time, the X-drivers will be

enabled, and the process will repeat, but instead measuring

the X-coordinate and storing the result in the X-register.

If only X- and Y-coordinates are to be measured, then the

conversion process is complete. See Figure 8 for a flowchart

for this process. The time it takes to go through this process

depends upon the selected resolution, internal conversion

clock rate, averaging selected, panel voltage stabilization

time, and precharge and sense times.

TABLE XXV. Result Data Format.

MSB

LSB

BIT 15

BIT 14

BIT 13

BIT 12

BIT 11

BIT 10

BIT 9

BIT 8

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

R11

R10

MSB

LSB

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