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29 Jun 2015


RS232 or RS485 Board will help you provide a seamless connection of either of the protocol RS232 or RS485 with your interfacing circuit.

RS232 or RS485 Module – [Link]

25 Jun 2015

The IEEE 1394, which is also called FireWire by Apple, is an interface standard for high-speed serial bus for connecting devices to a personal computer. Like USB, IEEE 1394 is a serial bus that uses twisted-pair wiring to move data around. However, USB is limited to 12Mbps, IEEE 1394 currently handles up to 400Mbps. The reference design illustrates single and dual port FireWire protective circuits. The single-port FireWire protective circuit is designed using the MAX5943A, while the dual-port FireWire protective circuit utilizes the MAX5944.

The circuit provides a 2.5A adjustable current limiting to the load at initial connection or during an overcurrent fault condition. It also provides 2ms adjustable current-limit timeout for excessive load current. It automatically attempts to restart after a fault shutdown condition. Some other features involve; less than 8 percent current-limited duty cycle during continuous fault condition, 6.5V undervoltage shutdown protection, low-drop O-Ring in multiple-power-source applications, and fault reporting. The FireWire port used in this design is the TE Connectivity’s 1734290-1. This connector conforms to IEEE 1394 standard with easy connections to equipment for use with plug and play devices.

This reference design is intended for circuit protection of IEEE 1394 single and dual port FireWire. It is applicable to wide ranges of PC connections, AV equipment and other related peripherals. It is also useful for automatic mounting machines with embossed tapes.

IEEE 1394 Single And Dual Port FireWire Protective Circuits – [Link]

22 Jun 2015


2 Diodes, 3 resistors and a transistor here’s Silicon Labs’ low cost solution on voltage level translation. [via]

This applications note discusses a low-cost circuit for I2C level translation. This circuit was developed for the Si701x, Si702x, and Si703x humidity sensors but will work in many applications. This circuit provides I2C level translation from a higher voltage supply, such as 5 V, to a lower voltage, supply such as 1.8 or 3.3 V. In addition, the optional emitter follower circuit provides a low-voltage power supply rail from the higher 5 V supply. Note that some devices allow for higher voltage tolerance on I2C inputs. For example, the Si7034 has a 3.3 V tolerant I2C interface, so the level translation is only required for 5 V I2C designs.

App note: Low cost I2C level translator – [Link]

10 Jun 2015

This project is fit for use in automotive and industrial network applications. As a Controller Area Network (CAN) transceiver, this device provides differential transmit capability to the bus and differential receive capability to a CAN controller at signaling rates up to1Mbps. The device is designed for operation in especially harsh environments and includes many device protection features such as under voltage lockout, over-temperature thermal shutdown, wide common-mode range, and loss of ground protection.

The MC34901WEF serves as an interface between a Controller Area Network (CAN) protocol controller and the physical bus and may be used in both 12V and 24V systems. The digital interface level is powered from a VPWR input supply providing true I/O voltage levels for the controller. The transceiver provides differential transmit capability to the bus and differential receive capability to the CAN controller. Due to the wide common−mode voltage range of the receiver inputs, the transceiver is able to reach outstanding levels of Electromagnetic Susceptibility (EMS). Similarly, extremely low Electromagnetic Emission (EME) is achieved by the excellent matching of the output signals.

The MC33901/34901 are SMARTMOS high-speed (up to 1Mbps) CAN transceivers providing the physical interface between the CAN protocol controller of an MCU and the physical dual wires CAN bus. They meet the ISO11898-2 and ISO11898-5 standards, and have low leakage on CAN bus while unpowered. It consumes very low current in standby mode and features automatic adaptation to 3.3 or 5V MCU communication.

High-speed CAN Transceiver – [Link]

3 Jun 2015


Ethan of Protofusion writes:

The CANable is a hardware clone of Eric Evenchick’s CANtact project, an open-hardware USB to CAN adapter compatible with socketcan. I took his design and reworked the hardware to be a bit more suitable for my personal needs, with a screw terminal instead of a DB9 connector and a much smaller PCB.

The CANable: a small USB to CAN adapter – [Link]

27 May 2015

Ham radio is a popular hobby and service in which a licensed amateur radio operator explores communications equipment. Typical ham radios do not have bluetooth support, which may be hassle for some. None of the transceiver manufacturers are providing a wireless interface. However, with this ham radio bluetooth interface, communicating and listening to other entity would be easier. The device uses Bluetooth module and a circular connector. The TE’s CeeLok FAS-T connector is one of the most rugged, small, 10 GB Ethernet, field terminable I/O connector. It has been designed to perform in some of the most extreme environments in the industry, while providing substantial size and weight savings via its small shell size 8-form factor.

The design is simple that anyone can construct it without having a hard time. The device uses a Bluetooth module, a regulator, connector and few passive components. It automatically connects to the PC or any bluetooth supported device when the application is started. Wireless headset would be very useful for ham radio operators so they can freely do whatever they need to do without being stagnant. In addition, a single blue LED indicates power and pairing.

Licensed amateur radio operators communicate with each other in nearby places, across the country, around the world or even with astronauts in outer space. Hams use a variety of frequencies for communications and may operate from just above the AM broadcast band to the microwave region, in the gigahertz range. This device may be useful for other applications such as aerospace, in flight entertainment and connectivity, defense and marine environments.

Simple Ham Radio Bluetooth Interface – [Link]

20 May 2015


This project provides a simple and easy solution to connect your computer to a RS485 Network in either Receiver or Transmitter mode.

This circuit has been designed around popular MAX232 and MAX485 interface IC.

RS232 to RS485 Module – [Link]

11 May 2015


In digital electronics, fan-out is defined as the number of gate inputs that the output of a single logic gate can feed. It is very important in digital systems for a single logic gate to drive other gates or devices. In this case, a buffer can be used between the logic gate and the devices it will drive. Clock buffer is also called as fan-out buffer. The IDT clock buffer clock divider and clock multiplexer portfolio includes devices with up to 27 outputs. Differential outputs such as LVPECL, LVDS, HCSL, CML, HSTL, as well as selectable outputs, are supported for output frequencies up to 3.2 GHz and single-ended LVCMOS outputs for frequencies up to 350MHz.

Modern digital systems often require many high quality clocks at logic levels that are different from the logic level of the clock source. Extra buffering may be required to guarantee accurate distribution to other circuit components without loss of integrity. Many systems require low jitter multiple system clocks for mixed signal processing and timing. The circuit shown in interfaces the ADF4351 integrated phase-locked loop (PLL) and voltage-controlled oscillator (VCO) to the ADCLK948, which provides up to eight low voltage differential signaling (LVDS) outputs from one differential output of the IDT 8SLVD1208-33. The IDT8SLVD1208-33I is characterized to operate from a 3.3V power supply. Guaranteed output-to-output and part-to-part skew characteristics make the IDT8SLVD1208-33I ideal for those clock distribution applications demanding well-defined performance and repeatability. Two selectable differential inputs and eight low skew outputs are available. The integrated bias voltage reference enables easy interfacing of single-ended signals to the device inputs. The device is optimized for low power consumption and low additive phase noise.

Fan-out buffers and clock dividers are general-purpose clock building block devices that can be used in any number of applications. They are ideal for clock and signal distribution in a large variety of systems, from personal computers to consumer electronics or industrial systems, as well as high-performance networking and communications systems.

Increasing Outputs from a Clock Source – [Link]

4 May 2015


The circuit uses a SC16C650 to implement an IrDA interface. Infrared Data Association (IrDA) has defined a group of short-range, high speed, bidirectional wireless infrared protocols, generically referred to as IrDA.

The hardware section is composed of SC16C650 which is electrically hooked-up to an IrDA transceiver module. The electrical connection between the SC16C650 and an IrDA transceiver module is very straightforward, no external component is required except an inverter to invert the IrDA output signal. Besides the power supply noise-filtering components, the only other component required is a 14 Ω resistor. This resistor sets the current through the IR emitter, hence the power output of the transceiver.

IrDA Interface for Portable Devices – [Link]

22 Apr 2015


This project provides you a simple and easy solution to connect / convert your Microcontroller input/output to be connected to the serial port of the Computer.

This projects build around popular MAX232 level shifter IC to do the Level Shifting (Voltage) between 5 V and 12 V DC.

An Onboard 9 pin female “D” connects this PCB to the Serial Port cable (not supplied with the Kit). Connector J1 connects to the Host for power supply and serial In/Out signals.

A – Provides data from the Computer to the Host (RXD)
B – Provides data to be sent to the Computer from the Host (TXD)

RS232 – MAX232 Interface Module – [Link]





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