SBASA67 June 2023 OPT4060
PRODUCTION DATA
The OPT4060 effective resolution is dependent on both the conversion time setting and the full-scale light range. Although the LSB resolution of the linear ADC_CODES does not change, the effective or useful resolution of the device is dependent on the conversion time setting and the full-scale range as per the table below. In conversion times where the effective resolution is lower, the LSBs are padded with 0.
CONVERSION_TIME REGISTER | CONVERSION TIME | MANTESSA EFFECTIVE BITS | EXPONENT | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
---|---|---|---|---|---|---|---|---|---|---|
FULL-SCALE LUX | 2254 | 4509 | 9018 | 18036 | 36071 | 72142 | 144284 | |||
EFFECTIVE RESOLUTION IN LUX | ||||||||||
0 | 600 us | 9 | 4.4 | 8.8 | 17.6 | 35.2 | 70.45 | 140.9 | 281.8 | |
1 | 1 ms | 10 | 2.2 | 4.4 | 8.8 | 17.6 | 35.2 | 70.45 | 140.9 | |
2 | 1.8 ms | 11 | 1.1 | 2.2 | 4.4 | 8.8 | 17.6 | 35.2 | 70.45 | |
3 | 3.4 ms | 12 | 550.4 m | 1.1 | 2.2 | 4.4 | 8.8 | 17.6 | 35.2 | |
4 | 6.5 ms | 13 | 275.2 m | 550.4 m | 1.1 | 2.2 | 4.4 | 8.8 | 17.6 | |
5 | 12.7 ms | 14 | 137.6 m | 275.2 m | 550.4 m | 1.1 | 2.2 | 4.4 | 8.8 | |
6 | 25 ms | 15 | 68.8 m | 137.6 m | 275.2 m | 550.4 m | 1.1 | 2.2 | 4.4 | |
7 | 50 ms | 16 | 34.4 m | 68.8 m | 137.6 m | 275.2 m | 550.4 m | 1.1 | 2.2 | |
8 | 100 ms | 17 | 17.2 m | 34.4 m | 68.8 m | 137.6 m | 275.2 m | 550.4 m | 1.1 | |
9 | 200 ms | 18 | 8.6 m | 17.2 m | 34.4 m | 68.8 m | 137.6 m | 275.2 m | 550.4 m | |
10 | 400 ms | 19 | 4.30 m | 8.6 m | 17.2 m | 34.4 m | 68.8 m | 137.6 m | 275.2 m | |
11 | 800 ms | 20 | 2.15 m | 4.30 m | 8.6 m | 17.2 m | 34.4 m | 68.8 m | 137.6 m |
As shown in the table above, the resolution of the device is dependent on the CONVERSION_TIME and full-scale range. A similar scaling applies to the peak responsitivity for each channel.