CMV2000 datasheet(13/64 Pages) AMSCO

13 / 64 page

Reference: CMV2000-datasheet-v3.8

CMV2000 v3 Datasheet

Page 12 of 63

The typical (offset) value of the temperature sensor at 0°C would be: 1000 ∗

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DN. This offset can differ per device.

A typical slope would be around 0.3 ∗

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°C/DN.

For example, for the calibration of a sensor you’re reading out a temperature register value of 1066 at 35°C die

temperature and an input frequency of 40MHz. If later you read out the temperature register value and it is 1184. You

can calculate the ambient temperature back from that.

Ambient temperature = [(1184-1066)*0.3*40/40Mhz] + 35°C = 70.4°C die temperature.

Or vice versa, if you want to know the temperature register value for a die temperature of -10°C at 40MHz:

If you want a more accurate calibration you can calibrate the sensor at multiple temperatures, so you will have the exact

value of the slope also. For most devices this should be around 0.29 ~0.31.

FIGURE 3: TYPICAL OUTPUT OF THE TEMPERATURE SENSOR OF THE CMV2000

Optical center

Pixel (0,0)

3.19mm

6.58mm

Temp. sensor

FIGURE 4: LOCATION OF THE TEMPERATURE SENSOR

200

400

600

800

1000

1200

1400

-40

-20

Temperature (C)

Temperature sensor

CMV2000 데이터시트(PDF) 13 Page - ams AG