Part Number: APDS-9005-020

Manufacturer: Broadcom / Avago

Description: Ambient Light Sensors

Shipped from: Shenzhen/HK Warehouse

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APDS-9005-020 Description

The APDS-9005 is a small chip LED lead-free surface mount ambient light photo sensor with low-cost analog output. It comprises a photo sensor with a spectrum response closely resembling the photonic observer used in the CIE standard.

The APDS-9005 best serves applications where ambient light monitoring is utilized to regulate display backlighting. By including these photo sensor devices in their designs, mobile appliances like mobile phones and PDAs that consume a lot of electricity from display backlighting would experience significant power savings.

APDS-9005-020 Features

  • The spectral response is comparable to the human eye’s.
  • Sensitivity varies little between different light sources.
  • -40 to 85 degrees Celsius are advised operating temperatures.
  • 8 to 5.5V for the Vcc supply
  • Lead-free packaging; adherence to RoHS.
  • Output linearity over a broad range of illumination.

Optical Window Design for APDS-9005 2.0 Optical Window Dimensions

There are some restrictions on the window’s dimensions and design to ensure that the APDS-9005’s performance won’t be compromised by poor window design. There is a restriction on the window’s minimum size so that it won’t interfere with the APDS-9005’s angular response when it is put in front of the photo light sensor.

This suggested minimum size guarantees a 35° light reception cone. Use a light pipe or light guide if a smaller window is needed. A cylindrical piece of clear plastic that uses total internal reflection to focus light is called a light pipe or light guide. Every optical window experiences a power loss of about 8% due to reflection (4% on each side) and an additional energy loss in the plastic material. As a result, the thickness of the window should be kept as low as possible.

General Application Guide for APDS-9005

The APDS-9005 is an inexpensive analog-output ambient light photo sensor with a spectrum response that nearly matches the human eye’s iris. The photo sensor used in the APDS-9005 can produce a high-gain photocurrent at a sufficient level for it to be converted to voltage using an external resistor with a known value. The APDS-9005 can be quickly and readily integrated into systems that use ADC input, which allows for the sampling of an external source. The amount of converted voltage, Vout, is influenced mainly by the load resistor employed, RL, and the photocurrent produced by the intensity of the light shining on the photo sensor.

The output voltage will rise as the light’s brightness or/and the load resistor increase. The “LUX” unit, which expresses how powerful a light source is to our eyes, is used to measure brightness. The tool used to measure “LUX” is a LUX meter. Human eyes perceive light sources at the same brightness regardless of their LUX level. The circuit’s amount of current-to-voltage conversion is determined by the load resistor RL that is chosen. Fluorescent lights, for example, have an ac noise frequency of roughly 100 Hz. To lessen the ripples, adding a 10uF capacitor in parallel with the load resistor, which functions as a low-pass filter, is advised.

The aperture of the Recommended Metal Solder Stencil

A stencil that is 0.11 mm (0.004 inches) thick is advised for printing solder paste. The shield pad’s aperture opening is 0.4 mm x 0.4 mm and 0.2 mm x 0.4 mm (per land pattern). To prevent shorting and ensure sufficient printed solder paste volume, do this.

Adjacent Land Keep out and Solder Mask Areas

The unit’s maximum area in the land pattern is known as adjacent land keep-out. There shouldn’t be any additional SMD components in this region. To prevent solder from connecting adjacent pads, a solder resist strip must have a minimum width of 0.2 mm.

Ambient Light Sensors

Basic Description

Systems like interior lighting controls, headlamp controls, and climate controls employ ambient light sensors (ALS) to measure the quantity of light in the surrounding area. Photoresistors, photodiodes, or phototransistors are the three main component types that make up most light sensors.

● Photoresistors or photocells

As their names suggest, the resistance between the two terminals of photoresistors or photocells fluctuates according to the quantity of light striking the component face. Changes in light intensity are correlated with changes in resistance. They feature a characteristic known as “light memory,” which makes their response to a particular light level reliant on earlier ambient light levels, although they are still comparatively incorrect. In all but the most straightforward applications, photoresistors require external calibration due to the variance in sensitivity between units. The least expensive solution for light detection, photoresistors typically have a response time of milliseconds.

● Photodiodes

Two additional terminal components are photodiodes. When light strikes the sensor surface, it can produce a voltage across the terminals proportionate to that light. Although the output current of photodiodes is relatively low (in the range of tens of nA per 1m/ft2), they display a linear relationship between their output current and light level. Additionally, there can be up to a 25% difference in sensitivity across units of the photodiode.

● Phototransistors

Included in two terminal transistors are phototransistors. A bipolar transistor’s base or a field-effect transistor’s gate is the third terminal, and the light-collecting surface fills that place. The amount of light that reflects off the surface controls how much current can flow from the collector to the emitter and provides the base (or gate) current (or source to drain). According to the intensity of the incident light, phototransistors generate an output current. They lack the “memory” of light and are typically significantly faster than photoresistors. However, there can be a 50% or more significant difference in sensitivity between units. Compared to the other possibilities, phototransistors are a little more expensive but more adaptable and have fast (nanoseconds) response times.

In general, ambient light sensors should mimic the visual spectral range of human eyes (380 nm to 780 nm with a peak response wavelength of roughly 550 nm). Unfortunately, because ambient light sensors typically respond to infrared (IR) and ultraviolet (UV) light, most sensors’ spectral responses differ from those of the human eye. As a result, if IR light is not correctly corrected, screens and light brightness controlled by ambient light sensors may not be at their best for human eyes. Self-correcting circuitry or an internal IR filter can solve this problem.


As efficient methods for improving power management and display quality in electronic systems and goods, ambient light sensor products are becoming increasingly common. Automatic brightness management by ambient light sensor feedback can considerably extend the battery life for portable gadgets like cell phones or power savings in headlights.

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