ZOPT2201 Datasheet

© 2016 Integrated Device Technology, Inc

19

September 2, 2016

3.6

Light Sensor Sensitivity Configuration

3.6.1

Gain Modes, Resolution, and Measurement Time

There are five analog gain modes to adjust the sensitivity of the ZOPT2201 device to the needs of the application. The microcontroller can

calculate the ambient light in lux by multiplying the ADC count value of the ALS channel with the appropriate output-scaling coefficient. A

similar method can be used for UVI determination via UVBS channel.

If ALS/UVBS_Raw Mode is used, temperature and stray light compensation must be carried out in the microcontroller before output scaling

Selected analog gain settings as well as resolution and measurement time settings are valid for all active 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 must be performed consecutively with modified settings.

Table 3.5 ALS Detection Ranges

Gain Mode 1

Gain Mode 3

Effective Output

Resolution

[Bits]

Measurement Time

[ms]

Minimum

Detection

[lux]

Maximum

Detection

[lux]

Result

Resolution

[lux/Count]

Minimum

Detection

[lux]

Maximum

Detection

[lux]

Result

Resolution

[lux/Count]

13

3.125

19.2000

157286

19.2000

6.4000

52429

6.4000

16

25

2.4000

157286

2.4000

0.8000

52429

0.8000

17

50

1.2000

157286

1.2000

0.4000

52429

0.4000

18 (default)

100

0.6000

157286

0.6000

0.2000

52429

0.2000

19

200

0.3000

157286

0.3000

0.1000

52429

0.1000

20

400

0.1500

157286

0.1500

0.0500

52429

0.0500

Gain Mode 6

Gain Mode 9

Effective Output

Resolution

[Bits]

Measurement Time

[ms]

Minimum

Detection

[lux]

Maximum

Detection

[lux]

Result

Resolution

[lux/Count]

Minimum

Detection

[lux]

Maximum

Detection

[lux]

Result

Resolution

[lux/Count]

13

3.125

3.2000

26214

3.2000

2.1333

17476

2.1333

16

25

0.4000

26214

0.4000

0.2667

17476

0.2667

17

50

0.2000

26214

0.2000

0.1333

17476

0.1333

18 (default)

100

0.1000

26214

0.1000

0.0667

17476

0.0667

19

200

0.0500

26214

0.0500

0.0333

17476

0.0333

20

400

0.0250

26214

0.0250

0.0167

17476

0.0167