SFH-7773 datasheet(4/24 Pages) OSRAM

4 / 24 page

SFH 7773

2013-03-01

Measurement modes

If VDD exceeds the threshold-voltage , the sensor will switch from OFF mode to STAND-BY mode. As

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

The transition time between modes (ttrans) is < 10ms. The delay time between STAND-BY and start of

measurement is max. 10ms for the ambient light sensor.

OFF

IDD is below 2μA and the device is inactive. Other units may use the I

2C bus without

any restrictions; I/O pins and INT are in Z state. There is no sink current through the

LED

STAND-BY

This is the initial mode after power-up. IDD is below 5μA. No measurement is

performed. Device can be activated by I2C bus communication. Data registers can

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 SFH7773. This mode can also be used

for ambient light sensor and proximity sensor. The measurement repetition rate and

current through the LED is defined by 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)

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