Datasheet
www.ti.com
TSC2004
SBAS408E – JUNE 2007 – REVISED MARCH 2008
CL1, CL0— Conversion clock control. These two bits specify the clock rate that the A/D converter uses to
perform conversion, as shown in Table 15 .
Table 15. A/D Converter Conversion Clock Control
CL1 CL0 FUNCTION
0 0 f
ADC
= f
OSC
/1. This is referred to as the 4MHz A/D converter clock rate, 10-bit resolution only
(1)
.
0 1 f
ADC
= f
OSC
/2. This is referred to as the 2MHz A/D converter clock rate.
1 0 f
ADC
= f
OSC
/4. This is referred to as the 1MHz A/D converter clock rate.
1 1 f
ADC
= f
OSC
/4. This is referred to as the 1MHz A/D converter clock rate.
(1) For SNSVDD = 1.2V at – 40 ° C, a lower A/D converter clock rate should be used to allow enough time for conversion settling.
PV2-PV0— Panel voltage stabilization time control. These bits specify a delay time from the moment the touch
screen drivers are enabled to the time the voltage is sampled and a conversion is started. These bits allow the
user to adjust the appropriate settling time for the touch panel and external capacitances. See Table 16 for
settings of these bits. The default state is 000, indicating a 0 µ s stabilization time. These bits are the same
whether reading or writing.
Table 16. Panel Voltage Stabilization Time Control
PV2 PV1 PV0 STABILIZATION TIME (t
PVS
)
0 0 0 0 µ s
0 0 1 100 µ s
0 1 0 500 µ s
0 1 1 1ms
1 0 0 5ms
1 0 1 10ms
1 1 0 50ms
1 1 1 100ms
PR2-PR0— Precharge time selection. These bits set the amount of time allowed for precharging any pin
capacitance on the touch screen prior to sensing if a pen touch is happening.
Table 17. Precharge Time Selection
PR2 PR1 PR0 PRECHARGE TIME(t
PRE
)
0 0 0 20 µ s
0 0 1 84 µ s
0 1 0 276 µ s
0 1 1 340 µ s
1 0 0 1.044ms
1 0 1 1.108ms
1 1 0 1.300ms
1 1 1 1.364ms
SNS2-SNS0— Sense time selection. These bits set the amount of time the TSC2004 waits to sense whether the
screen is touched after converting a coordinate.
34 Submit Documentation Feedback Copyright © 2007 – 2008, Texas Instruments Incorporated
Product Folder Link(s): TSC2004