ZOPT2202 Datasheet

© 2016 Integrated Device Technology, Inc

18

September 21, 2016

3.6

UV Sensor Sensitivity Configuration

3.6.1 Analog Gain Modes, Resolution, and Measurement Time

There are five analog gain modes to adjust sensitivity of the ZOPT2202 device to the needs of the application. The microcontroller can

calculate the received UV energy by multiplying the sensor output data with the appropriate output-scaling coefficients.

If UVAB_Raw Mode is used, temperature and stray light compensation shall be carried out in the microcontroller before output scaling

coefficients are applied (see section 3.4. for the UVAB_Raw Mode description).

Selected analog gain settings as well as resolution and measurement time settings are valid for all ADC converter channels at the same time.

The gain, resolution, and measurement time cannot be simultaneously set to different settings for different channels. If different gain or

resolution settings are required for different channels, conversions have to be carried out with modified settings one after another.

Table 3.5 UVAS Sensitivities

Gain Mode 1

Gain Mode 3

Gain Mode 6

Gain Mode 9

Gain Mode 18

Effective

Output

Resolution

[Bits]

Measurement

Time

[ms]

Sensitivity

Sensitivity

Sensitivity

Sensitivity

Sensitivity

13

3.125

0.074

0.221

0.443

0.664

1.328

16

25

0.590

1.771

3.542

5.313

10.625

17

50

1.181

3.542

7.083

10.625

21.250

18 (default)

100

2.361

7.083

14.167

21.250

42.500

19

200

4.722

14.167

28.333

42.500

85.000

20

400

9.444

28.333

56.667

85.000

170.000

Table 3.6 UVBS Sensitivities

Gain Mode 1

Gain Mode 3

Gain Mode 6

Gain Mode 9

Gain Mode 18

Effective

Output

Resolution

[Bits]

Measurement

Time

[ms]

Sensitivity

Sensitivity

Sensitivity

Sensitivity

Sensitivity

13

3.125

0.022

0.065

0.130

0.195

0.391

16

25

0.174

0.521

1.042

1.563

3.125

17

50

0.347

1.042

2.083

3.125

6.250

18 (default)

100

0.694

2.083

4.167

6.250

12.500

19

200

1.389

4.167

8.333

12.500

25.000

20

400

2.778

8.333

16.667

25.000

50.000