TSC2004 datasheet(48/62 Pages) TI2

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AUXILIARY AND TEMPERATURE MEASUREMENT

COORDINATE

OH3

OSC

)N @ (B)2) @

OSC

ADC

)OHCONV @

OSC

)

PPRO

OSC

(12)

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

COORDINATE

OH3

OSC

)N @ (B)2) @

OSC

ADC

)OHCONV @

OSC

)

PPRO

OSC

(13)

TSC

NotAddressed

NoTouch

Detected

HosttoWriteto

ControlByte1D[6:3]

As DAV

TSC

NotAddressed

Reading

AUX-Data

Sample,Conversion,

andAveragingfor

AUXMeasurement

TSC

NotAddressed

P ogra

mm dfor

Continuous

AUXMeasurement

TSC

Not

Addressed

Reading

AUX-Data

COORDINATE

Sample,Conversion,

andAveragingfor

AUXMeasurement

Sample,Conversion,

andAveragingfor

AUXMeasurement

TSC2004

SBAS408E – JUNE 2007 – REVISED MARCH 2008

The TSC2004 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 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 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:

Where:

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

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

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

Figure 47. Non-Touch Screen, Continuous AUX Measurement

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