TSC2014IYZGR datasheet(52/62 Pages) TI2

52 / 62 page

TSC

NotAddressed

NoTouch

Detected

HostWriteto

ControlByte1D[6:3]

As DAV

WaitingforHostto

ReadAUXData

TSC

NotAddressed

Reading

AUX-Data

Sample,Conversion,and

AveragingforAUXMeasurement

TSC

NotAddressed

P ogra

mm dfor

Non-Continuous

AUXMeasurement

COORDINATE

NoTouch

Detected

OSC

PPRO

COORDINATE

CONV

OSC

ADC

OSC

OH3

· §

¸ ¨

¹ ©

TSC2014

SBAS484B – SEPTEMBER 2010 – REVISED DECEMBER 2016

www.ti.com

Product Folder Links: TSC2014

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Typical Application (continued)

8.2.1 Design Requirements

For this design example, use the parameters shown in Table 25.

Table 25. Design Parameters

PARAMETER

VALUE

Power Supply

1.6 V

Reset

VIH ≥ 1.12

VIL ≤ 0.48

Touch Panel

4 Wire

8.2.2 Detailed Design Procedure

8.2.2.1 Auxiliary and Temperature Measurement

The TSC2014 can measure the voltage from the auxiliary input (AUX) and from the internal temperature sensor.

Applications for the AUX can include external temperature sensing, ambient light monitoring for controlling

backlighting, or sensing the current drawn from batteries. There are two converter functions that can be used for

the measurement of the AUX:

1. Non-continuous AUX measurement shown in Figure 46 (converter function select bits C[3:0] = Control Byte 1

D[6:3] = 0101); or

2. Continuous AUX Measurement shown in Figure 47 (converter function select bits C[3:0] = Control Byte 1

D[6:3] = 1000).

See Table 9 for more information on the converter function select bits.

There are also two converter functions for the measurement of the internal temperature sensor:

1. TEMP1 measurement (converter function select bits C[3:0] = Control Byte 1 D[6:3] = 0110); or

2. TEMP2 measurement (converter function select bits C[3:0] = Control Byte 1 D[6:3] = 0111).

See Table 9 for more information on the converter function select bits.

For the detailed calculation of the internal temperature sensor, see the Internal Temperature Sensor section.

These two converter functions have the same timing as the non-continuous AUX measurement operation as

shown in Figure 46; therefore, Equation 12 can also be used for internal temperature sensor measurement. The

time needed to make a non-continuous auxiliary measurement or an internal temperature sensor measurement is

given by:

(12)

Where:

OH3 = overhead time #3 = 3.5 internal clock cycles.

Figure 46. Non-Touch Screen, Non-Continuous AUX Measurement

TSC2014IYZGR Datasheet(PDF) 52 Page - Texas Instruments

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