Circuits & Schematics Interfaces

The circuit in Figure 1 derives its power from a USB port and produces 5 and 3.3 V supply rails for portable devices, such as digital cameras, MP3 players, and PDAs. The circuit allows the port to maintain communications while, for example, ...

Rajkumar Sharma Electronics-Lab This module is an isolated full-duplex differential line driver and receiver for TIA/EIA RS485/RS422 applications (Figure 1). The module is ideal for long transmission lines because the ground loop is broken to allow ...

Anthony Smith EDN Converting band-limited NRZ (non-return-to-zero) data to a digital format suitable for microprocessors and other digital systems poses problems when a signal's duty cycle or amplitude varies or when its average level ...

Soumitra Bhattacharjee EDN In PIC microcontrollers, the MSSP (master synchronous serial port) module uses multiplexed pins for the I 2 C and SPI peripherals. There is typically no issue using either of the two peripherals. But what if both ...

Dan Christman, Maxim Integrated Products EDN RS-232 communications with one µC and more than one remote system can be problematic, because most µCs contain only one UART, which provides an interface between synchronous and asynchronous ...

W. Stephen Woodward EDN Galvanically (that is, optically or electromagnetically) isolated 4- to 20-mA current loops offer robust noise immunity and tolerate long cable runs. These advantages, combined with simple unshielded two-wire cabling, make ...

Andreas Grün EDN Often, you need to transmit a couple of bits or bytes of data to a microcontroller without a direct cable connection. One simple way to achieve this goal is to use a widely available IR receiver, such as a TSOP17xx or similar ...

Michele Costantino EDN This Design Idea describes a simple and effective way to provide optoisolation for devices connected on the I 2 C bus (Figure 1). It improves on an earlier version (Reference 1). SDA and SCL are on the bus master’s side ...

Dan Meeks EDN Most current microprocessors, DSPs, and field-programmable gate arrays integrate hardware and software resources that support either or both of two common interface standards SPI (serial-peripheral interface) and I 2 C ...

Rex Niven EDN The ubiquitous LCD (Figure 1) (and VFD) modules based on the HD44780 controller IC can require up to 12 lines from the host. Figure 1. A typical LCD module. This hardware interface Design Idea (Figure 2) reduces the connection to just ...