TSC2117 datasheet(72/192 Pages) TI

72 / 192 page

Programmable

Divider

Page3/Register2,BitsD4–D3

ADCSARClock

ADCSAR

ConversionClock

Interval Timers

Internal

Oscillator

Poweredonif

RC_CLKIs

Selected

¸8

RC_CLK

RC_CLK/8

SignalUsedforSAR ADCLogic,

Finite-State-Machine(FSM)Panel

VoltageStabilization Time,

Pre-Charge Time,Sense Time

ToSAR ADC

Debounce TimeforPen-Touch

Removal.

Generation

UsedforProgrammable

Interval Timersforthe12-bitSAR.

AlsoUsedforDebounce Timefor

HeadsetDetectionLogicandfor

ofVariousInterrupts.

Programmable

Divider

Page3/Register17,BitsD6–D0

Page3/Register17,BitD7

MCLK

Programmable

Divider

Page3/Register16,BitsD6–D0

Page3/Register16,BitD7

B0213-02

To Avoid AsynchronousClockDomain

Issues, AlwaysSelecttheSameValuefor:

Page3/Register16,BitD7

Page3/Register17,BitD7

5.7.1.3 Touch Detect/Data Available – GPIO1 or GPIO2 Programmed as PINTDAV Signal

TSC2117

Low-Power Audio Codec With Embedded miniDSP, Stereo Class-D

Speaker Amplifier, and Smart Four-Wire Touch-Screen Controller

SLAS550A – APRIL 2009 – REVISED JUNE 2009

www.ti.com

Figure 5-40. SAR ADC and Interval Timer Clock Selection

Regardless of the conversion clock speed, the internal clock runs nominally at 8.2 MHz. The conversion

time of the TSC2117 depends on several functions. While the conversion clock speed plays an important

role in the time it takes for a conversion to complete, a certain number of internal clock cycles are needed

for proper sampling of the signal. Moreover, additional times, such as the panel voltage stabilization time,

can add significantly to the time it takes to perform a conversion. Conversion time can vary, depending on

the mode in which the TSC2117 is used. Throughout this data sheet, internal and conversion clock cycles

are used to describe the times that many functions take to execute. Considering the total system design,

these times must be taken into account by the user.

The ADC uses either the internal MCLK signal or the internal oscillator for the SAR conversions.

The interrupt pins (GPIO1 or GPIO2) can be programmed for three functions by writing to

page 0/register 51, bits D5–D2 (GPIO1) or page 0/register 52, bits D5–D2 (GPIO2) the value of 1100. In

this case, these pins function as the PINTDAV signal. The default setting of PINDAV is for pen interrupt

(PENIRQ). However, it could be used for a data-available interrupt (DATA_AVA), or it can be set up for

signaling when either a pen interrupt occurs or the ADC data is available (PENIRQ and DATA_AVA). To

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