SFH-7771 datasheet(8/30 Pages) OSRAM

8 / 30 page

Version 1.1

SFH 7771

Example of Proximity Setup

When proximity sensing is performed, it is

desirable that only light from a reflecting object

reaches the SFH 7771. Depending on the optical

setup, additional and unintended light paths from

the IR-Emitter to the detector may exist, which is

referred to as '(optical) crosstalk'. One measure to

avoid such crosstalk is to add a separator between

emitter and detector as drafted in the picture

below. For details please refer to our SFH 7771

application note.

Parameter

Symbol

Value

Unit

min.

typ.

max.

Proximity Sensor (PS)

Wavelength of maximum sensitivity



S,max

850

Sensitivity range,

=850nm

1 ...

5000

µW/cm

Proximity sensor output



e = 324 µW/cm



Ambient irradiance = 0 µW/cm

out

187

234

281

counts

LED ON time for one measurement

LED ON

200

300

µs

LED current, programmable

LED

200

Accuracy of LED current source

(ALS_PS_CONTROL: LED Current = 0b00)

LED

22.5

27.5

Mean current consumption in PS mode



(current consumption of the pulsed LED is not

included; MODE_CONTROL(0x41) = 0x03;



all other registers are default; V

DD = 2.5V)

150

µA

Mean current consumption in PS mode during

the 200µs LED pulse (t

LED ON)

(current consumption of the pulsed LED is not

included)

6.5

8.5

Temperature coefficient of proximity sensor

0.15

%/K

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