Version 1.1

22

Version 1.1

SFH 7771

ALS_VIS_TL_LSBs register (0x51)

LSB for the ALS_VIS threshold „LOW“.

R/W-Register 0x51

Bit

7

6

5

4

3

2

1

0

2

7

2

6

2

5

2

4

2

3

2

2

2

1

2

0

default

0

0

0

0

0

0

0

0

ALS_VIS_TL_MSBs register (0x52)

MSB for the ALS_VIS threshold „LOW“.

R/W-Register 0x52

Bit

7

6

5

4

3

2

1

0

2

15

2

14

2

13

2

12

2

11

2

10

2

9

2

8

default

0

0

0

0

0

0

0

0

INT modes

The Interrupt function compares ALS and PS measurement values with the current interrupt threshold

level. PS and ALS_VIS Interrupt status is readable via register 0x4A or at the INT pin of the sensor.

The Interrupt persistence function is only valid for PS measurements and is defined in register (0x43).

The INT pin of the SFH 7771 is open drain output and should be pulled up to V

resistor. When V

inactive by writing INT reset command, reading the INT status register or performing a software reset.

The INT status stays in its last state when the sensor is set to the standby mode. In the INT active state

„low“ the sensor consumes ~25µA extra current. Therefore OSRAM recommends to set the INT state to

high impedance before setting the sensor in standby mode.

Following ALS and PS INT modes are described for the unlatched mode. In latched mode the switching

back to the „inactive“ INT state is depending on a interrupt reset or the read of the INT status register.

ALS INT mode:

The ALS_VIS threshold levels high (register 0x4F & 0x50) and low (register 0x4F & 0x50) are

only valid for the ALS_VIS measurement values. The ALS_VIS INT mode is fixed and can not

be adapted via register. The thresholds define a window with following functionality:

ALS INT is active, if the ALS_VIS measurement values are outside the window

ALS INT is inactive, if the ALS_VIS measurement results are inside the window.

PS INT Modes: Bit <5;4> of INTERRUPT_CONTROL register (0x4A)

00 PS_TH is only active:

The INT state is active, if the PS measurement result is equal or higher than the set PS_TH high

threshold.

The INT state is inactive, if the PS measurement result is lower than the set PS_TH high thresh-