SFH 5701 Ambient Light Sensor (ALS)

By OSRAM Opto Semiconductors Inc 211

SFH 5701 Ambient Light Sensor (ALS)

OSRAM's SFH 5701 compact, IC-based, surface-mount (SMT) ALS is based on a sensitive photodiode with built-in thermal compensation and built-in, dark-current suppression. The built-in compensations help deliver a linear photocurrent output at any operating temperature. They also allow an increase of the operational dynamic range to six decades or the illumination range from very dark 0.05 lx to 10,000 lx. These qualities make this light sensor extremely versatile and easy in their application without the need of an I2C interface. The filter perfectly resembles the human eye sensitivity at an outstanding interference rejection (IR) to provide ultra-high fidelity to the actual light-level perceived by humans.

In applications where an I2C interface is not mandatory, the SFH 5701 delivers similar data quality without the need to integrate a software driver, poses no limits in the number of devices in one system, and does not limit designs in the length of the wire from the microcontroller to the ALS. It is ideal for applications where the programming environment allows the microcontroller to access the ALS at its own will. The small photodiode size makes it ultra-price competitive for many applications as well.

These benefits are available in an automotive approved SMT package (SFH 5701 A01) with a product qualification test plan based on the guidelines of AEC-Q101-REV-C stress test qualification for automotive grade discrete semiconductors. Typical automotive applications are dashboard backlighting regulation and head-lamp controls.

Block Diagram

  • The analog ALS IC has an analog current output proportional to the incident light level.
  • Rload converts the current output to a voltage output (VOUT): to interface to an ADC
  • This voltage output is typically applied to either the input of an ADC interface on an MCU or directly as an input to an LED driver IC equipped with auto-luminous control
  • RC low-pass filter to remove low-frequency flickering noise with a cut-off frequency (fc) of 50 Hz where fc = 1/(2*π*R*C)
Features
  • Simple implementation with just two pins
  • Built-in dark current compensation
  • Built-in thermal compensation
  • Close to human eye response
  • Excellent IR
  • Linear output
  • Small size: 2.0 mm x 1.25 mm x 0.8 mm
  • Wide dynamic range: 0.05 lx to 10,000 lx
  • Si photodiodes
  • SFH 5701 temperature range: -40°C to +100°C
  • SFH 5701 A01 (automotive version) temperature range: up to +125°C
Applications
  • Ambient light sensing
  • Control of display backlighting
  • Mobile devices
  • Home automation and smart speakers
  • Smart TVs
  • Industrial displays
  • Smart lighting controls
  • Automotive sunlight sensors and head-lamp controls
  • Automotive controls to display backlighting

New Products:

SFH 5701SFH 5701 A01

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