DESCRIPTION
The QT60320 digital charge-transfer (“QT”) QMatrix™ IC is designed to detect touch on up to 32 keys in a scanned X-Y matrix. It will project the keys through almost any dielectric, like glass, plastic, stone, ceramic, and even most kinds of wood, up to thicknesses of 5 cm or more. The touch areas are defined as simple 2-part interdigitated electrodes of conductive material, like copper, Indium-Tin-Oxide (ITO), or screened silver or carbon deposited on the rear of the control panel. Key sizes, shapes and placement are almost entirely arbitrary; sizes and shapes of keys can be mixed within a single panel of keys and can vary by a factor of 20:1 or more in area. The gain (sensitivity) and threshold of each key can be set individually via simple commands over the UART port, for example via the freeware QmBtn program. Key setups are stored internally in an onboard eeprom and do not need to be reloaded.
The IC is designed specifically to work with appliances, ATM machines, security panels, portable instruments, machine tools, or similar products that are subject to environmental 'challenges' or even physical attack. It permits the construction of 100% sealed, watertight keypanels that are immune to environmental factors such as humidity and condensation, temperature, dirt accumulation, or the physical deterioration of the panel surface from abrasion, chemicals, or abuse. To this end the QT60320 contains Quantum-pioneered self-calibration, drift compensation, and digital filtering algorithms that make the sensing function extremely robust and survivable.
The device can readily control keys over graphical LCD panels or LEDs when used with clear, conductive ITO electrodes. It does not require 'chip on glass' or other exotic fabrication techniques, thus allowing the OEM to source the keymatrix from multiple vendors.
External circuitry consists of an opamp, a common PLD, and a quad fet switch, which can fit into a footprint of roughly 1 square inch (6.5 sq. cm). The device also can control two status LEDs, and includes in addition 8 addressable output drive lines and 4 readable spare input lines which can be used to control LEDs, LCDs, or other panel functions without requiring additional control lines from the host CPU. It also makes available to the user 86 bytes of onboard writeable and readable eeprom via the serial interface, thus helping to reduce system cost by eliminating extra components.
QT60320 technology makes use of an important new variant of charge-transfer sensing, transverse charge-transfer, in an XY format that minimizes the number of required scan lines. Unlike older technologies it does not require one IC per key, and is cost competitive even with some membrane technologies. In many cases it can also replace resistive XY sense elements commonly used in touch screens, at a fraction of the price.
This part is not recommended for new designs. Consult Quantum for advice on alternatives.

FEATURES
*Creates 32 ‘touch buttons’ through any dielectric
*100% autocal for life - no adjustments required
*'N' key rollover: senses all 32 keys in parallel
*Keys individually adjustable for sensitivity
*Mix 'n match key sizes & shapes in one panel
*Tolerates a 20:1 variance in key sizes on a panel
*Panel thicknesses to 5 cm or more
*Back lit keys possible with ITO electrodes
*LED status function drives
*User-addressable multifunction drive pins
*User-addressable internal eeprom
*Simple, universal serial interface
*5V single supply operation
*44-pin TQFP package
*One square inch (6.5 square cm) of PCB required

APPLICATIONS
*Automotive panels
*Machine tools
*ATM machines
*Touch-screens
*Appliance controls
*Outdoor keypads
*Security keypanels
*Industrial keyboards

QT60320C-AS, QT60320C-A

Trackback :: http://datasheetblog.com/trackback/2767

댓글을 달아 주세요 Comment

DESCRIPTION
The QT60040 digital charge-transfer (“QT”) QMatrix™ IC is designed to detect touch on up to 4 keys in a scanned 4x1 matrix.
It will project the keys through almost any dielectric, like glass, plastic, stone, ceramic, and even most kinds of wood, up to thicknesses of 6mm. The touch areas are defined as simple 2-part interdigitated electrodes of conductive material, like copper, Indium-Tin-Oxide (ITO), or screened silver or carbon deposited on the rear of a control panel. Alternatively the keys can be implemented on a stick-on flex circuit that can be adhered to the rear of most panels.
The IC is designed specifically for domestic appliances, computer and peripheral control buttons, ATM machines, security panels, portable instruments, machine tools, or similar products that are subject to environmental challenges or physical attack. It permits the construction of 100% sealed, watertight keypanels that are immune to environmental factors such as humidity and condensation, temperature, dirt accumulation, or the physical deterioration of the panel surface from abrasion, chemicals, or abuse. The QT60040 contains Quantum-pioneered self-calibration, drift compensation, and digital filtering algorithms that make its sensing function extremely robust and survivable.
The device can easily control keys over graphical LCD panels or LEDs when used with clear, conductive ITO electrodes.
does not require 'chip on glass' or other exotic fabrication techniques, thus allowing the OEM to source the keymatrix from multiple vendors.
External circuitry consists only of a single, inexpensive capacitor. The sensitivity of the keys can be set by simply changing the value of this capacitor. The device has 4 outputs which indicate detection on the keys; up to 2 keys can be sensed at any one time.
The QT60040 features automatic recalibration timeouts which will cause the device to recalibrate keys on an individual basis when they are 'stuck on' for intervals of either 10s or 60s, depending on a jumper option.
QT60040 technology makes use of an important new variant of charge-transfer sensing, transverse charge-transfer, in an XY format that minimizes the number of required scan lines and external components. Unlike older technologies it does not require one IC per key, and is cost competitive even with some rubber membrane technologies. A distinct advantage is an accelerated time to market due to the fact that custom molded membranes are not required; the entire system can be designed using common PCB materials.

FEATURES
*Creates 4 ‘touch buttons’ through any dielectric
*Only 1 inexpensive capacitor required
*Simple 4x1 matrix key geometry
*100% drift compensation for lifetime reliability
*'2' key rollover: senses any 2 keys at same time
*Back-lit keys possible with ITO electrodes
*Simple direct 'per key' active-high drive outputs
*Auto recalibration after 10 or 60 seconds of touch
*2.5 - 5.5V single power supply operation
*CMOS design - very low power consumption
*14-pin SOIC package
*E604 Evaluation reference design board available

APPLICATIONS
*Automotive controls
*PC / peripheral controls
*ATM machines
*Touch-screens
*Appliance controls
*Vandal-proof keypads
*Security keypanels
*Industrial keyboards

QT60040-IS, QT60040-D

Trackback :: http://datasheetblog.com/trackback/2271

댓글을 달아 주세요 Comment

General Description
The AAT3340 is a low-noise, constant-frequency charge pump DC/DC converter that uses a dual-mode load switch (1x) and fractional (1.5x) conversion to maximize efficiency for white LED applications.
The AAT3340 is capable of driving 4 white LEDs at a total of 80mA from a single 2.7V to 5.5V input.
The current sinks may be operated individually or in parallel while driving higher-current LEDs.
A low external parts count (two 1μF flying capacitors and two small 1μF capacitors at VIN and VOUT) makes the AAT3340 ideal for small battery-powered applications.
Analogic Tech’s Simple Serial Control (S2Cwire) digital interface is used to enable, disable and set current to one of 32 levels for the LEDs.
The AAT3340 is equipped with built-in short-circuit and over-temperature protection.
The soft-start circuitry prevents excessive inrush current at start-up and mode transitions.
The AAT3340 family is available in Pb-free, space-saving TSOPJW and TDFN33 packages, and operates over the -40°C to +85°C ambient temperature range.

Features
* Dual-Mode (1x/1.5x) Charge Pump
* Drives up to 4-Channel Backlight LEDs
* 32-Level Programmable Backlight Current (linear, inverting)
* Single-wire S2Cwire Control
* Built-in Thermal Protection
* Automatic Soft Start
* -40°C to +85°C Temperature Range
* TSOPJW-12 and TDFN33-12 Packages

Applications
* Cellular and Smart Phones
* Digital Still and Video Cameras
* PDAs
* Portable Devices
* Portable Media Players
* Other White LED Backlighting
TAG CHARGE, Pump

Trackback :: http://datasheetblog.com/trackback/1763

댓글을 달아 주세요 Comment

DESCRIPTION
The SP6887 is a 4-channel charge pump white LED driver, capable of driving up to 4 LEDs
connected in parallel.
The device operates in either 1x mode or 1.5x fractional mode, and it can switch from 1x mode to 1.5x mode automatically when the input voltage decreases.
Its internal 4 current sink regulators ensure both LED current matching and brightness uniformity.
The LED current can be programmed by an external resistor, RSET, connected between the RSET pin and ground.
LED currents of up to 30mA are supported by the input supply voltage over a range of 2.7V to 5.5V, making the device optimized for Li-Ion battery applications.
The SP6887 has a fixed switching frequency of 1MHz, allowing the use of very small value ceramic capacitors.
The enable input pin allows the device to be placed in shutdown mode while reducing current consumption to less than 1μA.
LED dimming can be done by several methods including using a DC voltage to set the RSET pin current, adding a switched resistor in parallel with RSET or applying a PWM signal to CTRx pin or EN pin.

FEATURES
* Peak Efficiency: 90%
* Individual Current Regulation
* 3-bit Digital Output Control
* 1x and 1.5x Modes of Operation
* Current Matching with a Max Tolerance of 3%
* Output Current up to 30mA per LED
* Fixed Frequency of 1MHz
* Open LED Protection
* Pb-Free Thin QFN-16 3mmx3mm Package

APPLICATIONS
* Cellular Phones
* LED backlighting
* LCD Modules
* Handheld Devices
* Digital Cameras
* PDAs
* MP3 Players

SP6887ER4-L
SP6887ER4-L/TR

Trackback :: http://datasheetblog.com/trackback/1683

댓글을 달아 주세요 Comment