SBAA432A april 2020 – july 2023 OPT3001 , OPT3001-Q1 , OPT3004 , OPT3006 , OPT3007
To create a test platform with a defined light source, users can refer to the OPT3001: Ambient Light Sensor Application Guide application note.
This application note uses the following equipment for calibration:
The OPT4001 device can be configured to operate with light conversion times from 600 μs to 800 ms in 12 steps, providing system flexibility based on application needs. Conversion time includes the integration time and ADC conversion time. The resolution of the measurement is determined by a combination of light intensity and the integration time, effectively bringing in the capability to measure down to 312.5 μlux of light intensity changes for the PicoStar™ variant and 437.5 μlux for the SOT-8 variant. The conversion time is the time taken to complete one light measurement and update the results in the output register. Resolution is configured in the conversion time register. For example, using a section of the OPT4001 resolution table shown in 4-7, the resolution is 0.02 lux when the conversion time register is set to 50 ms and the lux intensity is approximately 1310 lux. For the full resolution table, see the OPT4001 data sheet.
| Conversion Time Register | Conversion Time (ms) | EXPONENT | 0 | 1 | 2 | 4 |
|---|---|---|---|---|---|---|
| Full-scale lux | 328 | 655 | 1310 | 2621 | ||
| Effective Resolution in lux | ||||||
| 6 | 25 | 0.01 | 0.02 | 0.04 | 0.08 | |
| 7 | 50 | 5 m | 0.01 | 0.02 | 0.04 | |
| 8 | 100 | 2.5 m | 50 m | 0.01 | 0.02 | |