ISL29021

® ISL29021 Data Sheet March 3, 2009 FN6732.0 Digital Proximity Sensor with Interrupt Function The ISL29021 is an integrated proximity and infrared sensor with a built-in IR LED driver and I2C Interface (SMBus Compatible). This device provides infrared sensing to allow proximity estimation featured with interrupt function. For infrared and proximity sensing, an internal ADC has been designed based on the charge-balancing A/D conversion technique. The ADC is used to digitize the output signal from the photodiode array when the internal IR LED driver is turned on and off for the programmed time periods under user-selected modulation frequency to drive the external IR LED. As this proximity sensor employs a noise cancellation scheme to highly reject unwanted IR noise, the digital output of proximity sensing decreases with distance. The driver output current is user selectable up to 100mA to drive different types of IR emitters LEDs. Four different modes of operation can be selected via the I2C interface: programmable IR sensing once, programmable proximity sensing once, programmable continuous IR sensing and programmable continuous proximity sensing. The programmable one-time operation modes greatly reduce power because an immediate automatic shutdown reduces overall supply current less than 0.5µA. The ISL29021 supports both hardware and software interrupts that remain asserted until the host clears it through I2C interface for proximity detection. Designed to operate on supplies from 2.5V to 3.63V, the ISL29021 is specified for operation over the -40°C to +85°C ambient temperature range. It is packaged in a clear, Pb-free 8 Ld ODFN package. Features Proximity Sensing • Ambient IR Cancellation During Proximity Sensing - Works Under Direct Sunlight • IR LED Driver with Programmable Source Current - Adjustable Current Drive from 100mA to 12.5mA • Programmable LED current Modulation Frequency • Variable Conversion Resolution up to 16-bits • Selectable Range (via I2C) • Works Under Various Light Sources, Including Sunlight Ideal Spectral Response for Proximity Sensor • Proximity sensor range from 850nm to 950nm - Can use either 850nm or 950nm LED solution Ultra Low Power • 90μA Max Operating Current • Software Shutdown and Automatic Shutdown - 0.5μA Max Shutdown Current Easy to Use • I2C (SMBus Compatible) Output • No Complex Algorithms Needed • Temperature Compensated • Small Form Factor - 8 Ld 2.0mmx2.1mmx0.7mm ODFN Package Additional Features • I2C and SMBus Compatible • 1.7V to 3.63V Supply for I2C Interface • 2.25V to 3.63V Sensor Power Supply • Pb-Free (RoHS compliant) Ordering Information PART NUMBER (Note) ISL29021IROZ-T7* TEMP. RANGE (°C) -40 to +85 PACKAGE (Pb-Free) 8 Ld ODFN PKG. DWG. # L8.2.1x2.0 Applications • Display and Keypad Proximity Sensing for: - Mobile Devices: Smart Phone, PDA, GPS - Computing Devices: Notebook PC, Webpad - Consumer Devices: LCD-TV, Digital Picture Frame, Digital Camera • Industrial and Medical Proximity Sensing ISL29021IROZ-EVALZ Evaluation Board *Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and NiPdAu plate - e4 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2009. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. ISL29021 Pinout ISL29021 (8 LD ODFN TOP VIEW) VDDD 1 VDDA 2 GND 3 REXT 4 8 IRDR 7 INT 6 SDA 5 SCL EXPOSED PAD CAN BE CONNECTED TO GND OR ELECTRICALLY ISOLATED Pin Descriptions PIN NUMBER PIN NAME 1 2 3 4 5 6 7 8 VDDD VDDA GND REXT SCL SDA INT IRDR Positive digital supply: 2.5V to 3.63V. Positive analog supply: 2.5V to 3.63V, VDDA and VDDD should be externally shorted. Ground. External resistor pin setting the internal reference current and the conversion time. 499kΩ with 1% tolerance resistor is recommended. I2C serial clock line I2C serial data line Interrupt pin; LO for interrupt/alarming. The INT pin is an open drain. IR LED driver pin connecting to the anode of the external IR LED. The source current of the IR LED driver can be programmed through I2C. Exposed pad connected to ground or electrically isolated. The I2C bus lines can be pulled from 1.7V to above VDD, 3.63V max. DESCRIPTION Block Diagram VDDA 2 VDDD 1 COMMAND REGISTER IR DATA PROCESS INTEGRATION ADC DATA REGISTER 6 IR PHOTODIODE ARRAY IREF INTERRUPT FOSC IR DRIVER 4 REXT 3 GND ISL29021 7 INT I2C 5 SDA SCL 8 IRDR 2 FN6732.0 March 3, 2009 ISL29021 Absolute Maximum Ratings (TA = +25°C) VSUP(VDDD,VDDA) Supply Voltage between VDD and GND . . . . . .4V VDDA Supply Voltage between VDDA and GND . . . . VDDD +/- 0.5V I2C Bus (SCL, SDA) and INT Pin Voltage . . . . . . . . . . . . -0.2V to 4V I2C Bus (SCL, SDA) and INT Pin Current . . . . . . . . . . . . . . .