TSC2301 datasheet(39/92 Pages) TI

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TSC2301 DATA REGISTERS

X, Y, Z1, Z2, BAT1, BAT2, AUX1, AUX2, TEMP1, and TEMP2 REGISTERS

Keypad Data Register (Page 0, Address 04H)

DAC Data Register (Page 0, Address 0BH)

OPERATION - TOUCH SCREEN MEASUREMENTS

Conversion Controlled by TSC2301 Initiated at Touch Detect

TSC2301

SLAS371D – SEPTEMBER 2002 – REVISED AUGUST 2004

Table 28. PLL Settings (continued)

MCLK (MHz)

Desired

Actual Fout(MHz)

% Error

Fout(MHz)

19.68

22.5792

22.59556

0.072

The data registers of the TSC2301 hold data results from conversions or keypad scans, or the value of the DAC

output current. All of these registers default to 0000H upon reset, except the DAC register, which is set to 0080H,

representing the midscale output of the DAC.

The results of all A/D conversions are placed in the appropriate data register, as described in Table 5 and

Table 3. The data format of the result word, R, of these registers is right-justified, as follows (assuming a 12-bit

conversion):

Bit 15

Bit 14

Bit

Bit 10 Bit 9 Bit 8

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

MSB

LSB

R11

R10

MSB

LSB

The keypad data register (Page 0, Address 04H) is formatted as follows:

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

MSB

LSB

K15

K14

K13

K12

K11

K10

This is the same format as used in the keypad mask register (Page 1, Address 10H). Each bit in these registers

represents one key on the keypad. A 16-key keypad is mapped into the keypad data register as shown in

Table 23.

The data to be written to the DAC is written into the DAC data register, which is formatted as follows:

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

MSB

LSB

RES

There are three different touch screen conversion modes available in the TSC2301: self-controlled or

PENIRQ-Initiated, host-initiated, and host-controlled. These three modes are described below.

In this mode, the TSC2301 detects when the touch panel is touched and causes the PENIRQ line to go low. At

the same time, the TSC2301 powers up its internal clock. It then turns on the Y-drivers, and after a programmed

panel voltage stabilization time, powers up the ADC and convert the Y coordinate. If averaging is selected,

several conversions may take place; when data averaging is complete, the Y coordinate result is stored in the Y

This mode is recommended to fully utilize the integrated touch screen processing of the TSC2301 and

reduce the processing overhead and number of interrupts to the host processor. In this mode, the host

processor does not need to monitor PENIRQ, instead the host needs only to configure the TSC2301 once at

power-up, and then monitor DAV and read back data after a falling edge on DAV.

If the screen is still touched at this time, the X-drivers are enabled, and the process repeats, but measures

instead the X coordinate, storing the result in the X register.

TSC2301 Datasheet(PDF) 39 Page - Texas Instruments

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