TSL26721FN

General 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.

Key Benefits & Features

The benefits and features of TSL2672, Digital Proximity Detector
are listed below:

Features

• Patented Dual-Diode Architecture
• Programmable Proximity Offset Adjustment
• Proximity Saturation Indicator Bit
• Programmable LED Drive Current
• 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 2.2mA Sleep State with User-Selectable Sleep-After-Interrupt Mode
• 90 mA 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 x 2 mm ODFN Package

Benefits

• Enables Operation in IR Light Environments
• Eliminates IR LED System Cross Talk
• Prevents False Proximity Detection in Bright Light
• Allows Multiple Power-level Selection without External Passives

Applications
TSL2672, Digital Proximity Detector is ideal for:
• 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