ISL29028A中文资料带智能中断和睡眠模式的低功耗环境光和接近传感器数据手册Renesas规格书

描述 Description

The ISL29028A is an integrated ambient and infrared light-to-digital converter with a built-in IR LED driver 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.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. 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 ISL29028A provides low power operation of ALS and 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 ISL29028A uses both a hardware pin and software bits to indicate an interrupt event has occurred. An ALS interrupt is defined as a measurement which 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 ISL29028A 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.

特性 Features

• Works Under All Light Sources Including Sunlight
• Intelligent Interrupt Scheme Simplifies μC Code
• Simple Output Code Directly Proportional to lux
• Light Sensor Close to Human Eye Response
• Proximity Sensor with Broad IR Spectrum
• IR LED Driver with I2C Programmable Sink Currents
• Periodic Sleep Time up to 800ms Between Pulses
• Independent ALS/Prox Interrupt Thresholds
• 1/4/8/16 Consecutive Triggers Required Before InterruptUltra Low Power
• 110μA for Sensors and Internal Circuitry
• Easy to Use
• I2C (SMBus Compatible) Output
• Tiny ODFN8 2.0x2.1x0.7 (mm) PackageAdditional Features
• 2.25V to 3.63V Sensor Power Supply
• I2C Address Selection Pin

应用 Application

• Display and Keypad Dimming Adjustment and Proximity Sensing for:
• Computing Devices: Laptop PC, Netbook
• Industrial and Medical Light and Proximity Sensing