ams Datasheet

Page 11

[v1-00] 2016-Apr-12

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TSL2568, TSL2569 − Electrical Characteristics

5. Full scale ADC count value is limited by the fact that there is a maximum of one count per two oscillator frequency periods and also

by a 2-count offset.

Full scale ADC count value = ((number of clock cycles)/2 − 2)

Field value 00: Full scale ADC count value = ((11 × 918)/2 − 2) = 5047

Field value 01: Full scale ADC count value = ((81 × 918)/2 − 2) = 37177

Field value 10: Full scale ADC count value = 65535, which is limited by 16-bit register. This full scale ADC count value is reached for

131074 clock cycles, which occurs for Tint = 178ms for nominal fosc = 735kHz.

6. Low gain mode has 16× lower gain than high gain mode: (1/16 = 0.0625).

7. The sensor Lux is calculated using the empirical formula shown in “Calculating Lux” on page 35 of this data sheet based on measured

Ch0 and Ch1 ADC count values for the light source specified. Actual Lux is obtained with a commercial luxmeter. The range of the

(sensor Lux) / (actual Lux) ratio is estimated based on the variation of the 640nm and 940nm optical parameters. Devices are not

100% tested with fluorescent or incandescent light sources.