TMD2672 반도체 회로 부품 판매점
DIGITAL PROXIMITY DETECTOR
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 TAOS |
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Features
D Digital Proximity Detector, LED Driver, and
IR LED in a Single Optical Module
D Register Set- and Pin-Compatible with the
TMD2671 Series
D Proximity Detection
− Reduced Proximity Count Variation *
− Programmable Offset Control Register *
− Saturation Indicator *
− Programmable Integration Time and Offset
− Current Sink Driver for IR LED
− 16,000:1 Dynamic Range
D Maskable Proximity Interrupt
− Programmable Upper and Lower
Thresholds with Persistence Filter
D Power Management
− Low Power 2.2 mA Sleep State with User-
Selectable Sleep-After-Interrupt Mode *
− 90 mA Wait State with Programmable Wait
Time from 2.7 ms to > 8 seconds
D I2C Fast Mode Compatible Interface
− Data Rates up to 400 kbit/s
− Input Voltage Levels Compatible with VDD
or 1.8-V Bus
D 3.94 mm y 2.36 mm y 1.35 mm Package
* New or improved feature
TMD2672
DIGITAL PROXIMITY DETECTOR
TAOS149C − AUGUST 2012
PACKAGE
MODULE−8
(TOP VIEW)
VDD 1
SCL 2
GND 3
8 SDA
7 INT
6 LDR
LEDA 4
5 LEDK
Package Drawing is Not to Scale
Applications
D Mobile Handset Touchscreen Control and
Automatic Speakerphone Enable
D Mechanical Switch Replacement
D Paper Alignment
End Products and Market Segments
D Mobile Handsets, Tablets, Laptops and
HDTVs
D White Goods
D Toys
D Digital Signage
D Printing
Description
The TMD2672 family of devices provides a complete proximity detection system and digital interface logic in
a single 8-pin surface mount module. The devices are register-set and pin-compatible with the TMD2671 series
and includes new and improved proximity detection features. The proximity detection includes improved
signal-to-noise and accuracy. A proximity offset register allows compensation for optical system crosstalk
between the IR LED and the sensor. To prevent false proximity data measurement readings, a proximity
saturation indicator bit signals that the internal analog circuitry has reached saturation. Interrupts have been
enhanced with the addition of a sleep-on-interrupt feature that also allows for a single cycle operation. The
device internal state machine provides the ability to put the device in a low-power mode in between proximity
measurements, providing very low average power consumption.
The proximity detection system includes an LED driver and an IR LED, which are factory trimmed to eliminate
the need for end-equipment calibration due to component variations.
The LUMENOLOGY r Company
r
Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road S Suite 300 S Plano, TX 75074 S (972r) 673-0759
www.taosinc.com
Copyright E 2012, TAOS Inc.
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TMD2672
DIGITAL PROXIMITY DETECTOR
TAOS149C − AUGUST 2012
Functional Block Diagram
LDR
VDD
LEDA
LEDK
IR LED Constant
Current Sink
Prox
Integration
Channel 0
Prox Control
Prox
ADC
Prox
Data
Wait Control
Channel 1
Interrupt
Upper Limit
Lower Limit
INT
SCL
SDA
GND
Detailed Description
A fully integrated proximity detection solution is provided with an 850-nm IR LED, LED driver circuit, and
proximity detection engine. An internal LED driver (LDR) pin, is externally connected to the LED cathode (LEDK)
to provide a controlled LED sink current. This is accomplished with a proprietary current calibration technique
that accounts for all variances in silicon, optics, package, and most important, IR LED output power. This
eliminates or greatly reduces the need for factory calibration that is required for most discrete proximity sensor
solutions. The device is factory calibrated to achieve a proximity count reading at a specified distance with a
specific number of pulses. In use, the number of proximity LED pulses can be programmed from 1 to 255 pulses,
which allows different proximity distances to be achieved. Each pulse has a 16-μs period, with a 7.2-μs on time.
The device provides a separate pin for level-style interrupts. When interrupts are enabled and a pre-set value
is exceeded, the interrupt pin is asserted and remains asserted until cleared by the controlling firmware. The
interrupt feature simplifies and improves system efficiency by eliminating the need to poll a sensor for a proximity
value. An interrupt is generated when the value of a proximity conversion exceeds either an upper or lower
threshold. In addition, a programmable interrupt persistence feature allows the user to determine how many
consecutive exceeded thresholds are necessary to trigger an interrupt.
Copyright E 2012, TAOS Inc.
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www.taosinc.com
The LUMENOLOGY r Company
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TMD2672 detector
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