TSL2561 datasheet(18/37 Pages) OSRAM

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ams Datasheet

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[v1-01] 2018-Apr-23

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TSL2561 − Principles of Operation

Integration time is dependent on the INTEG FIELD VALUE and

the internal clock frequency. Nominal integration times and

respective scaling between integration times scale

proportionally as shown in Figure 18. See Note4 and Note5 for

detailed information regarding how the scale values were

obtained; see Calculating Lux for further information on how

to calculate lux.

Figure 18:

Integration Time

The manual timing control feature is used to manually start and

stop the integration time period. If a particular integration time

period is required that is not listed in Figure 18, then this feature

can be used. For example, the manual timing control can be

used to synchronize the TSL256x device with an external light

source (e.g. LED). A start command to begin integration can be

initiated by writing a 1 to this bit field. Correspondingly, the

integration can be stopped by simply writing a 0 to the same

bit field.

Interrupt Threshold Register (2h − 5h)

The Interrupt Threshold registers store the values to be used as

the high and low trigger points for the comparison function for

interrupt generation. If the value generated by channel 0

crosses below or is equal to the low threshold specified, an

interrupt is asserted on the interrupt pin. If the value generated

by channel 0 crosses above the high threshold specified, an

interrupt is asserted on the interrupt pin. Registers

THRESHLOWLOW and THRESHLOWHIGH provide the low byte

and high byte, respectively, of the lower interrupt threshold.

Registers THRESHHIGHLOW and THRESHHIGHHIGH provide the

low and high bytes, respectively, of the upper interrupt

threshold. The high and low bytes from each set of registers are

combined to form a 16-bit threshold value. The interrupt

threshold registers default to 00h on power up.

INTEG Field Value

Scale

Nominal Integration Time

0.034

13.7ms

0.252

101ms

402ms

N/A

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