TSC2005 datasheet(39/46 Pages) TI2

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AUXILIARY AND TEMPERATURE MEASUREMENT

COORDINATE

OH3

OSC

)N @ (B)2) @

OSC

ADC

)OHCONV @

OSC

)

PPRO

OSC

(12)

Deactivated

NoTouch

Detected

HostWriteto

ControlByte1D[6:3]

As DAV

WaitingforHostto

ReadAUXData

Deactivated

Reading

AUX-Data

Sample,Conversion,and

AveragingforAUXMeasurement

Deactivated

P ogra

mm dfor

Non-Continuous

AUXMeasurement

COORDINATE

NoTouch

Detected

COORDINATE

OH3

OSC

)N @ (B)2) @

OSC

ADC

)OHCONV @

OSC

)

PPRO

OSC

(13)

Deactivated

NoTouch

Detected

HosttoWriteto

ControlByte1D[6:3]

As DAV

Deactivated

Reading

AUX-Data

Sample,Conversion,

andAveragingfor

AUXMeasurement

Deactivated

P ogra

mm dfor

Continuous

AUXMeasurement

Deactivated

Reading

AUX-Data

COORDINATE

Sample,Conversion,

andAveragingfor

AUXMeasurement

Sample,Conversion,

andAveragingfor

AUXMeasurement

TSC2005

SBAS379C – DECEMBER 2006 – REVISED MARCH 2008

The TSC2005 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 39 (converter function select bits C[3:0] = Control Byte 1

D[6:3] = 0101); or

2. Continuous AUX Measurement shown in Figure 40 (converter function select bits C[3:0] = Control Byte 1

D[6:3] = 1000).

See Table 7 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 7 for more information on the converter function select bits.

For the detailed calculation of the internal temperature sensor, please see the SubSec1 9.3 section. These two

converter functions have the same timing as the non-continuous AUX measurement operation as shown in

Figure 39; 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:

Where:

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

Figure 39. Non-Touch Screen, Non-Continuous AUX Measurement

The time needed to make continuous auxiliary measurement is given by:

Figure 40. Non-Touch Screen, Continuous AUX Measurement

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