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Translate TTY Current
Loop to Rs-232 - 08/01/98 EDN Design Idea (NOTE:
Multiple circuits in this file, scroll to find this one. )The circuit in Figure 1a provides signal translation
between a passive current-loop (TTY) interface and a duplex RS-232C port. The current flowing in the receiver
loop causes the transistor to pull down RxD; when the transistor turns off, R1 pulls up RxD. In like manner, the
current in the transmitter loop switches on for a negative TxD voltage and off for a positive voltage. . . . [by
Jerzy Chrzaszcz, Warsaw University, Poland]
Transmission Line RAPIDESIGNERr Operation and
Applications Guide - Application Note . . . [National
Semiconductor]
Transmitter Accurately Transfers Voltage Input - 05/15/03 EDN Design Idea When you connect remote sensors to a central process controller,
a simple, robust, and commonly used interface is the 4- to 20-mA loop. The advantages of this current loop
include the simplicity of just two twisted wires that share. . . [by Clayton Grantham, National Semiconductor,
Tucson, AZ]
Transmitting video over CAT5 cable - With the world
dominance of personal computer systems, demand for long distance component video transmission is increasing at an
unprecedented pace. The applications areas of greatest demand are KVM systems, server farms, information message
boards and educational classrooms. . . [Mike Wong, Intersil Corp., Director of Applications Engineering,
Milpitas, CA ]
Tricks improve on Excel LCD initialization - 11-Apr-02 EDN
Design Idea A previous Design Idea on using Excel for LCD initialization relies on the user for cutting and
pasting from Excel into an editor (Reference 1]. It appears that it would take a minimum of six keystrokes or
mouse strokes from one cha. . . [by Aubrey Kagan, Weidmüller Ltd, Markham, ON, Canada]
Tricks increase utility of parallel port - 09/27/01 EDN Design Idea In this simple application of the 68HC68 microcontroller's
serial-I/O utility, the goal is to configure a simple circuit, driven by any LPT parallel-printer port, which you
can use as a remote I/O for a PC. You can independently pr. . . [by Lorenzo Tazzari, Selex SNC, Alessandria,
Italy]
Triple Output 3.3V 5V & 12V High Efficiency Notebook Power Supply - DN78 Design Notes (Linear Technology). . . [Linear Technology]
TSR Logs Assembler & Compiler Errors in File - 04/27/95 EDN Design Idea If you use a PC to develop software for embedded systems, you
probably still use good, old MS-DOS for most of your processing, because most compilers, assemblers, and linkers
don't run under MS Windows. If you're developing a sizable program, you probably use automated procedures such as
batch files or "make" files to build and rebuild your target program. When you use batch files or make files,
capturing the PC's screen output in a disk file is more convenient than sitting around, watching everything
endlessly scroll by on the screen. . . . [by John S Santic, Computer Consultant, Frederick, MD]
TTL <> RS232 Conversion - This small realization, based on one of the most common IC (MAX232) is designed to create a
small and convenient TTL to RS232 and vice versa converter. All you need is 4 caps, one IC. . .
TV RGB Signal Output from a SVG Graphics Card - To achieve a CCInfrared conform TV signal with50 Hz vertical interlaced refresh and15. 625
kHz horizontal frequency on most SVGA cards its possible to re-program CRT Timing and generate output signals
outside the normal specification range. Then some pretty simple hardware is needed for rest of the signal
conversion. . . .
Two picogate devices for bidirectional level-shifting - 11-Nov-04 EDN Design Idea In new mixed-voltage systems, it is often necessary to
level-shift a control signal from a high level to a low level. An open-drain device, such as the 74LVC1G07,
easily performs this shift. However, when a bidirectional signal req. . . [by Bob Marshall, Philips
Semiconductors]
Two
transistor circuit replaces IC - 02/07/02 EDN Design
Idea Linear Technology's recently introduced LTC4300 chip buffers I2C clock and data lines to and from a
hot-swappable card. This task is difficult because the IC must work bidirectionally, meaning that you can
simultaneously and active. . . [by Jim Hagerman, Hagerman Technology, Honolulu, HI]
Two Transistor Circuit replaces IC (Hagtech) - I am always impressed with the way semiconductor manufacturers go out of their way to make
the end designer’s job easier. One example is the LTC4300 recently introduced by Linear Technology. . . . [Jim
Haggerman, Hagerman Technology LLC]
Two Transistors Form Bidirectional Level
Translator - You often need to convert a logic signal from
one power-supply voltage to another. This conversion is a relatively simple task, unless the signal happens to be
bidirectional. Serial buses such as Access. Bus, I2C, and SBI use bidire�Ψt into. . . [Design Idea by Jim
Hagerman, Nokia Mobile Phones, San Diego, CA]
Two wire 4 by 4 key keyboard interface saves power - 08/17/06 EDN Design Idea Resistor matrix and microcontroller encode keypad - You can use a
microcontroller that includes an ADC to design a two-wire-plus-ground keyboard interface. For example, you can
use a resistive voltage divider to identify a presse. . . [by Stefano Salvatori, University of Rome, Rome,
Italy, and Gabriele Di Nucci, EngSistemi, Rome, Italy]
Two Wire LCD Interface using PIC16cf84 - . . . [Reynold's Elec]
Two-transistor circuit replaces IC - 02/07/02 EDN Design
Idea Linear Technology's recently introduced LTC4300 chip buffers I2C clock and data lines to and from a
hot-swappable card. This task is difficult because the IC must work bidirectionally, meaning that you can
simultaneously and active. . . [by Jim Hagerman, Hagerman Technology, Honolulu, HI]
Two-wire interface has galvanic isolation - 11/11/99 EDN Design Idea Unlike the four-wire SPI, QSPI, and Microwire data-interface
standards, I2C and SBBus buses require only two wires for data transmission, because they send and receive over
the same wire. The circuit in Figure 1 provides galvanic isolation for the two-wire interface. A small
transformer and a MAX253 transformer driver (not shown) derive an isolated 5V rail from the master-side 5V rail.
The data rate and isolation-barrier voltage in your application guide the selection of the transformer and
optocoupler. . . . [by Minh-Tam Nguyen]
Two-wire, four-by-four-key keyboard
interface saves - 08/17/06 EDN Design Idea You can use a
microcontroller that includes an ADC to design a two-wire-plusground keyboard interface. For example, you can use
a resistive voltage divider to identify a pressed key (Reference 1). A microcontroller’s integrated . . . [by
Stefano Salvatori, University of Rome, Rome, Italy, and Gabriele Di Nucci, EngSistemi, Rome, Italy]
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