TSL260, TSL261, TSL262

IR LIGHT-TO-VOLTAGE OPTICAL SENSORS

SOES008A – DECEMBER 1992 – REVISED FEBRUARY 1993

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

5–5

APPLICATION INFORMATION

NOTE A: Pullup resistor extends linear output range to near VDD with minimal (several millivolts typical) effect on VDARK; particularly useful

at low VDD (3 V to 5 V).

TSL26x

Sensor

Output

RP = 100 kΩ

VDD

2

3

1

Figure 7. Pullup for Increased VOM

† OPTEK part number

TSL261

Sensor

Output

50-k

Ω

Threshold

5 V

2

3

1

+

–

100

Ω

OP240†

5 V

4

5 V

4.7 k

Ω

10 k

Ω

15 k

Ω

LM393

1

8

3

2

15 k

Ω

NOTE A: Output goes high when beam is interrupted; working distance is several inches or less. Intended for use as optical-interrupter switch

or reflective-object sensor.

Figure 8. Short-Range Optical Switch With Hysteresis