Features
- Works Under All Light Sources Including Sunlight
- Intelligent Interrupt Scheme Simplifies µC Code
- Proximity Sensor with Broad IR Spectrum
- Can Use 850nm and 950nm External IR LEDs
- IR LED Driver with I2C Programmable Sink Currents
- Net 100µs Pulse with 110mA or 220mA Amplitudes
- Periodic Sleep Time up to 800ms Between Pulses
- Ambient IR Noise Cancellation (Including Sunlight)
- Intelligent and Flexible Interrupts
- Proximity Interrupt Thresholds
- Adjustable Interrupt Persistency
- 1/4/8/16 Consecutive Triggers Required Before Interrupt
- Ultra Low Power
- 138µA DC Typical Supply Current for Prox Sensing
- 110µA for Sensors and Internal Circuitry
- 28µA Typical Current for External IR LED (Assuming 220mA for 100µs Every 800ms)
- <1.0µA Supply Current When Powered Down
- Easy to Use
- Set Registers; Wait for Interrupt
- I2C (SMBus Compatible) Output
- Temperature Compensated
- Tiny ODFN8 2.0x2.1x0.7 (mm) Package
- 1.7V to 3.63V Supply for I2C Interface
- 2.25V to 3.63V Sensor Power Supply
- Pb-Free (RoHS Compliant)
- I2C Address Selection Pin
Description
The ISL29027 is an integrated infrared light-to-digital converter with a built-in IR LED driver and I2C Interface (SMBus Compatible). The flexible interrupt scheme is designed for minimal microcontroller utilization. For proximity sensor (Prox) data conversions, the built-in driver turns on an external 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 540µs conversion time. The ISL29027 provides proximity sensing with a typical 138µA normal operation current (110µA for sensors and internal circuitry, ~28µA for external LED) with 220mA current pulses for a net 100µs, repeating every 800ms (or under). The ISL29027 uses both a hardware pin and software bits to indicate an interrupt event has occurred. A proximity interrupt is defined as a measurement over a threshold limit. The user may also require that proximity interrupts occur at once, up to 16 times in a row before activating the interrupt pin. The ISL29027 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 lead ODFN package.
Applications
- Mobile Devices: Smart Phone, PDA, GPS
- Computing Devices: Laptop PC, Netbook
- Consumer Devices: LCD-TV, Digital Picture Frame, Digital Camera
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