參數(shù)資料
型號(hào): EVAL-AD7879-1EBZ
廠商: Analog Devices Inc
文件頁(yè)數(shù): 9/41頁(yè)
文件大?。?/td> 0K
描述: BOARD EVALUATION FOR AD7879-1
標(biāo)準(zhǔn)包裝: 1
主要目的: 接口,觸摸屏控制器
嵌入式:
已用 IC / 零件: AD7879-1
主要屬性: 4 線電阻式觸控屏控制器,I²C 和 SPI 接口
次要屬性: 圖形用戶界面,USB 接口
已供物品: 板,線纜,CD,觸控屏
AD7879/AD7889
Rev. C | 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 × 103 = 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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