Description

The TSL2672 family of devices provides proximity detection when coupled with an external IR LED. The devices incorporate a constant-current LED sink driver to pulse the external IR LED and achieve very low average power consumption using the low-power wait state with programmable wait time between proximity measurements. In addition, the devices are register-set and pin-compatible with the TSL2671 series and include a number of new and improved features, such as improved signal-to-noise and measurement accuracy. A proximity offset register allows compensation for optical system crosstalk between the IR LED and the sensor. To prevent false measurements, a proximity saturation bit indicates that the internal analog circuitry saturated. Interrupts have been enhanced with the addition of a sleep-after-interrupt feature that also allows for single-cycle operation.

Features

● Proximity Detection with an Integrated LED Driver in a Single Device

● Register Set- and Pin-Compatible with the TSL2x71 Series

● Proximity Detection

− Reduced Proximity Count Variation

− Programmable Offset Control Register

− Saturation Indicator

− Programmable Analog Gain and Integration Time

− Current Sink Driver for External IR LED

− 16,000:1 Dynamic Range

● Maskable Proximity Interrupt

− Programmable Upper and Lower Thresholds with Persistence Filter

● Power Management

− Low Power 2.2 A Sleep State with UserSelectable Sleep-After-Interrupt Mode

− 90 A Wait State with Programmable Wait Time from 2.7 ms to > 8 seconds

● I2C Fast Mode Compatible Interface

− Data Rates up to 400 kbit/s

− Input Voltage Levels Compatible with VDD or 1.8-V Bus

● Small 2 mm 2 mm Dual Flat No-Lead (FN) Package

Applications

● Mobile Handset Touchscreen Control and Automatic Speakerphone Enable

● Mechanical Switch Replacement

● Printer Paper Alignment

End Products and Market Segments

● Mobile Handsets, Tablets, Laptops, and HDTVs

● White Goods

● Toys

● Digital Signage

● Printers