- Internal LED + Sensor = complete solution
- Works under all light sources including sunlight
- Dual ADCs measure ALS/Prox concurrently
- <1.0μA Supply current when powered down
- Temperature compensated
- Pb-Free (RoHS compliant)
Intelligent and Flexible Interrupts
- Independent ALS/Prox interrupt thresholds
- Adjustable interrupt persistency
- 1/4/8/16 consecutive triggers required before interrupt
The ISL29044A is an integrated ambient and infrared light-to-digital converter with a built-in IR LED and I2C Interface (SMBus Compatible). This device uses two independent ADCs for concurrently measuring ambient light and proximity in parallel. The flexible interrupt scheme is designed for minimal micro-controller utilization.
For ambient light sensor (ALS) data conversions, an ADC converts photodiode current (with a light sensitivity range up to 3200Lux) in 100ms per sample. The ADC rejects 50Hz/60Hz flicker noise caused by artificial light sources.
For proximity sensor (Prox) data conversions, the built-in driver turns on an internal infrared LED and the proximity sensor ADC converts the reflected IR intensity to digital. This ADC rejects ambient IR noise (such as sunlight) and has a 547μs conversion time.
The ISL29044A provides low power operation of ALS and proximity sensing with a typical 133μA normal operation current (108μA for sensors and internal circuitry, ~25μA for LED) with 220mA current pulses for a net 100μs, repeating every 800ms (or under).
The ISL29044A uses both a hardware pin and software bits to indicate an interrupt event has occurred. An ALS interrupt is defined as a measurement that is outside a set window. A proximity interrupt is defined as a measurement over a threshold limit. The user may also require that both ALS/Prox interrupts occur at once, up to 16 times in a row before activating the interrupt pin.
The ISL29044A is designed to operate from 2.25V to 3.63V over the -40°C to +85°C ambient temperature range. It is packaged in a clear, lead-free 8 Ld ODFN package.
- Display and keypad dimming adjustment and proximity sensing for:
- Mobile devices: Smart phone, PDA, GPS
- Computing devices: Laptop PC, Netbook, Tablet PC
- Consumer devices: LCD-TV, digital picture frame, digital camera
- Industrial and medical light and proximity sensing
|Peak Spectral Sensitivity||550 nm||550 nm||525 nm||545 nm|
|VS (min)||2.25 V||2.25 V||2.25 V||2.25 V|
|VS (max)||3.63 V||3.63 V||3.63 V||3.63 V|
|Supply Current (μA)||94µA||94µA||110||125|
|Lux Range (min)||0 lux||0 lux||0 lux||0 lux|
|Lux Range (max)||2000 lux||2000 lux||2000 lux||4000 lux|
|Counts/Lux (max) (Counts)||2.048||2.048||2.048||1.024|
|Dark ADC Code @ Ev=0Lux (max) (Counts)||3||3||3||1|
|Address Selection Pins?||No||No||Yes||No|
|Package Dimensions (mm)||2.36x3.94x1.35||2.36x3.94x1.35||2.1x3.5x0.68||2.1x2.0x0.7|
|Features||Internal LED + Sensor||Internal LED + Sensor||Built-in IR LED, small size||Enhanced IR Rejection|
|Enable Pin?||Software Enabled||Software Enabled||Software Enabled||No|
Low Power Ambient Light and Proximity Sensor with Internal IR-LED and Digital Output
29 Apr 2016
|29 Apr 2016||548 KB|
|ISL29xxx Evaluation Boards User Guide|
Evaluation Hardware/Software Manual for ALS and Proximity Sensor
17 Aug 2016
|17 Aug 2016||1.14 MB|