SFH 7770

2011-09-16

4

Measurement modes

If

V

in the transition diagram above it is possible to switch between all modes without any restriction. The

transition time between modes

(t

measurement is max. 10ms for the Ambient Light Sensor.

OFF

I

any restrections; I/O pins and INT are in a high Z state. There is no sink current

through the LEDs.

STAND-BY

This is the initial mode after power-up

. I

performed. Device can be activated by I

be read and written. The data will be stored in the registers when the device goes

from TRIGGERED or FREE-RUNNING to STAND-BY.

TRIGGERED

Every measurement is separately initiated by MCU. This mode can be used for

Ambient Light Sensor and Proximity Sensor. Measurement data are available in the

registers after a defined delay time.

FREE-RUNNING

Measurements are triggered internally by SFH7770. This mode can also be used

for Ambient Light Sensor and Proximity Sensor. Measurement repetition rate and

current through the LEDs are defined by the MCU. Measurement results can be

read from the data register, the status from the interrupt register.

STAND_BY

STAND-BY

OFF

Ambientlight

Sensor

(ALS)

Proximity

Sensor

(PS)

STAND_BY

STAND-BY

OFF

Ambientlight

Sensor

(ALS)

Proximity

Sensor

(PS)