ISL29027

Proximity Sensor with Intelligent Interrupt and Sleep Modes ISL29027 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. Features • Works Under All Light Sources Including Sunlight • Intelligent Interrupt Scheme Simplifies μC Code Proximity Sensing • 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) •