DESCRIPTION
VCNL4040 integrates a proximity sensor (PS), ambient
light sensor (ALS), and a high power IRED into one small
package. It incorporates photodiodes, amplifiers, and
analog to digital converting circuits into a single chip by
CMOS process. The 16-bit high resolution ALS offers
excellent sensing capabilities with sufficient selections to
fulfill most applications whether dark or high transparency
lens design. High and low interrupt thresholds can be
programmed for both ALS and PS, allowing the component
to use a minimal amount of the microcontrollers resources.
The proximity sensor features an intelligent cancellation
scheme, so that cross talk phenomenon is eliminated
effectively. To accelerate the PS response time, smart
persistence prevents the misjudgment of proximity sensing
but also keeps a fast response time. In active force mode, a
single measurement can be requested, allowing another
good approach for more design flexibility to fulfill different
kinds of applications with more power saving.
The patented FiltronTM technology achieves ambient light
spectral sensitivity closest to real human eye response and
offers the best background light cancellation capability
(including sunlight) without utilizing the microcontrollers’
resources. VCNL4040 provides an excellent temperature
compensation capability for keeping output stable under
various temperature configurations. ALS and PS functions
are easily set via the simple command format of I2C
(SMBus compatible) interface protocol. Operating voltage
ranges from 2.5 V to 3.6 V. VCNL4040 is packaged in a
lead (Pb)-free 8-pin molding package, which offers the best
market-proven reliability quality.

FEATURES
• Package type: surface-mount
• Dimensions (L x W x H in mm): 4.0 x 2.0 x 1.1
• Integrated modules: infrared emitter (IRED),
ambient light sensor (ALS), proximity sensor
(PS), and signal conditioning IC
• Operates ALS and PS in parallel structure
• FiltronTM technology adoption for robust
background light cancellation
• Temperature compensation: -40 °C to +85 °C
• Low power consumption I2C (SMBus compatible)
interface
• Floor life: 168 h, MSL 3, according to J-STD-020
• Output type: I2C bus (ALS / PS)
• Operation voltage: 2.5 V to 3.6 V
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
PROXIMITY FUNCTION
• Immunity to red glow (940 nm IRED)
• Programmable IRED sink current
• Intelligent cancellation to reduce cross talk phenomenon
• Smart persistence scheme to reduce PS response time
• Selectable for 12- / 16-bit PS output data

AMBIENT LIGHT FUNCTION
• High accuracy of ALS ±10 %
• Fluorescent light flicker immunity
• Spectrum close to real human eye responses
• Selectable maximum detection range (819 / 1638 / 3277 /
6553) lux with highest sensitivity 0.0125 lux/step

INTERRUPT
• Programmable interrupt function for ALS and PS with
upper and lower thresholds
• Adjustable persistence to prevent false triggers for ALS
and PS

APPLICATIONS
• Handheld device
• Notebook, tablet PC
• Consumer device
• Industrial application