App note from NXP Semiconductors shows I2C-bus galvanic isolation solution by splitting the bi-directional bus to unidirectional logic signals and passing them through opto-isolator couplers. Link here (PDF) Many systems that can benefit from the advantages of I2C-bus control are not allowed to share any common reference signal (ground) potential. To prevent any chance of […]
Tag Archives: isolation
App note: Optical isolator for I2C Bus System
App note from Vishay on galvanically isolating I2C bus by optocoupler. Link here (PDF) The I2C bus, also known as inter-IC bus, is a bidirectional, two-wire, multi-user bus. It was developed by Philips Semiconductors to connect microcontrollers, EEPROMs, A/D and D/A converters, I/O interfaces, and other peripherals. For optical isolation between master and slave, an […]
App note: Optocoupler as optical isolator for RS-232 Bus System
Using optocoupler for galvanic isolation of RS-232 Bus introduced in this app note from Vishay. Link here (PDF) The RS-232 bus is a serial, single-ended bus system with a data transfer rate up to 115.2 kBd. The application areas are computer to computer or computer to peripheral devices communication, like a printer, mouse, and so […]
App note: Understanding the safety certification of digital isolators
This application note summarizes the international safety standards and certifications that apply to digital isolators. Link here Digital isolators provide signal isolation and the level shifting required for the correct operation of many circuits. Equally important, they insulate the user from electric shock. With basic human safety considerations so pertinent here, these isolators must undergo […]
App note: Safety considerations and layout recommendations for digital isolators
Application note from Silicon Labs about end user safety against high voltage shock that are designed together with digital isolators. Link here (PDF) This application note details the creepage and clearance requirements of an isolator type component, such as a digital isolator, used to provide protection from electric shock. It also details layout recommendations to […]
App note: Isolating USB with SPI
Old but still good technical note from Analog Devices on USB isolation. Link here (PDF) Currently, iCoupler® digital isolation technology is capable of transferring data at rates ranging from DC to about 150Mbps, which is adequate for transferring serial data to support low (1.5Mbps) and full (12Mbps) speed modes of USB. There are three places […]
Home produced 700VA isolation transformer
Dilshan Jayakody writes: This a quick post regarding homemade 300V – 2.3A isolation transformer. This transformer is a part of my ongoing 300V AC/DC variable power supply project and it’s boxed as a separate unit because of its heavy weight and size. All the parameters of this transformer are calculated using small Python script which […]