AD7879_17 datasheet(16/40 Pages) AD

部件名	AD7879

功能描述	Low Voltage Controller for Touch Screens

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制造商	AD [Analog Devices]

网页	http://www.analog.com

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16 / 40 page

AD7879/AD7889

Data Sheet

Rev. D | Page 16 of 40

Temperature Calculations

If an explicit temperature reading in degrees Celsius is required,

calculate for the single measurement method as follows:

1. Calculate the scale factor of the ADC in degrees per LSB.

Degrees per LSB = ADC LSB size/−2.1 mV =

(VCC/4096)/−2.1 mV

2. Save the ADC output, DCAL, at the calibration

temperature, TCAL.

3. Take the ADC reading, DAMB, at the temperature to be

measured, TAMB.

4. Calculate the difference in degrees between TCAL and TAMB by

∆T = (DAMB − DCAL) × degrees per LSB

5. Add ∆T to TCAL.

Example

Using VCC = 2.5 V as reference,

Degrees per LSB = (2.5/4096)/−2.1 × 10−3 = −0.291

The ADC output is 983 decimal at 25°C, equivalent to a diode

forward voltage of 0.6 V.

The ADC output at TAMB is 880.

∆T = (880 − 983) × −0.291 = 30°C

TAMB = 25 + 30 = 55°C

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