Low Power Ambient Light and Proximity Sensor with Internal IR-LED and Digital Output ISL29044 Features The ISL29044 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 microcontroller utilization. • Internal LED + Sensor = Complete Solution For ambient light sensor (ALS) data conversions, an ADC converts photodiode current (with a light sensitivity range up to 2000 Lux) in 100ms per sample. The ADC rejects 50Hz/60Hz flicker noise caused by artificial light sources. • Pb-Free (RoHS compliant) 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. • Adjustable interrupt persistency - 1/4/8/16 consecutive triggers required before interrupt • Works under all light sources including sunlight • Dual ADCs measure ALS/Prox concurrently • <1.0μA Supply current when powered down • Temperature compensated Intelligent and Flexible Interrupts • Independent ALS/Prox interrupt thresholds Applications • 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 The ISL29044 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 ISL29044 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. Related Literature • See AN1436, “Proximity Sensors” The ISL29044 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. V_LED V_PULLUP I2C SLAVE 0 5 6 7 8 LED- LED+ IRDR GND INT SDA SCL VDD ISL29044 4 R1 RES1 C3 0.1µF R2 RES1 I2C MASTER 3 2 1 C1 0.1µF R3 RES1 VDD I2C SLAVE 1 C2 SCL 1µF SDA I2C-DIAGRAM I2C SLAVE_n SCL SCL SDA INT CONTROLLER SDA I2C-DIAGRAM FIGURE 1. TYPICAL APPLICATION October 30, 2012 FN8305.0 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2012. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. ISL29044 ISL29044 Block Diagram VDD 1 ALS PHOTODIODE ARRAY COMMAND REGISTER LIGHT DATA PROCESS ALS AND IR IR PHOTODIODE ARRAY DUAL CHANNEL ADCs DATA REGISTER I2C IREF INTERRUPT FOSC IR DRIVER 3 GND Pin Configuration ISL29044 (8 LD 2.36X3.94 (mm) OPTICAL CO-PACKAGE) TOP VIEW LED- 5 4 LED+ IRDR 6 3 GND INT 7 2 SCL SDA 8 1 VDD 2 SCL 8 SDA 4 LED+ 7 INT 6 IRDR 5 LED- Pin Descriptions PIN# PIN NAME DESCRIPTIONS 1 VDD Voltage supply 2.25V to 3.63V. 2 SCL I2C clock line can be pulled from 1.7V to above VDD, 3.63V max. 3 GND Ground 4 LED+ Anode of IR LED 5 LED- Cathode of IR LED 6 IRDR IR-LED driver pin - current flows into ISL29044 from LED cathode. 7 INT Interrupt pin; Logic output (open-drain) for interrupt. 8 SDA I2C data line can be pulled from 1.7V to above VDD, 3.63V max. For additional products, see www.intersil.com/product_tree Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted in the quality certifications found at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 2 FN8305.0 October 30, 2012