News

• USB IC charges, supplies and protects 1/3/2008

  The USB port is fast becoming “the preferred means for portable- device-battery charging” according to Linear Technology—the company notes the need for a charge-management solution that can handle high ....

  8-bit microcontroller implements digital lowpass filter 1/3/2008

  Filtering occurs frequently in the analog world. Unfortunately, in the digital world, engineers apply it mainly to the DSPs (digital-signal processors) and not to the small 8-bit microcontrollers that designers commonly ....

  Automotive switching regulators get input-transient-voltage protection 1/3/2008

  Engineers often face difficult trade-offs in cases where voltage regulators might encounter high voltage transients that are well above normal input-supply operating ranges. This situation is common in automotive applications ....

  One microcontroller pin drives two LEDs with low quiescent current 1/3/2008

  The basis for this Design Idea is a circuit that uses three resistors and a microcontroller-I/O pin to work as input high impedance or output to independently drive two LEDs (Reference 1). The idea sounded ....

  IC performs delayed system reset upon power-up 1/3/2008

  In most applications, the MR (manual-reset) pin usually connects to a switch to create a manualreset signal to the supervisory chip. Subsequently, after a predetermined time-out-active ....

  Isolated supply powers DVM module 1/3/2008

  Low-cost DVM (digital-voltmeter) modules are economical and can significantly reduce design time for instrumentation. Yet, these modules also involve a significant number of design challenges. For example, their inputs ....

  Design an RTD interface with a spreadsheet 1/3/2008

  RTDs (resistance-temperature detectors) are the preferred sensor choices for designs requiring precision. Although RTDs are approximately linear over the limited temperature range of 0 to 100°C, these sensors exhibit ....

  Oscars overshadowed by EDN Innovation Awards! 22/2/2008

  Only a few days to go until voting closes in EDN’s Annual Innovation Awards. As in previous years, the Awards will be announced and presented at a function that takes place in San Jose, California, in April – but readers of any edition of EDN Worldwide ....

  Improved optocoupler circuits reduce current draw, resist LED aging 1/2/2008

  It seems deceptively simple to establish galvanic isolation with the help of optocouplers between circuits that operate at different ground potentials. Optocouplers draw power from the isolated circuit, and switching ....

  Dual-input sample-and-hold amplifier uses no external resistors 1/2/2008

  At least two classic ways exist to address applications requiring sampling of a sum of analog voltages. The most common way is to cascade a classic analog adder and a sample-andhold amplifier. A classic analog adder is ....

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