Clock & Timer Circuit DiagramsUSB Circuit Diagrams

I2C Hot Swap Schematic Circuit Diagram

USB Convenience: Seamless Device Connection

The ubiquity of USB has accustomed us to the convenience of connecting or disconnecting devices without the hassle of shutting down the power first. This user-friendly feature, however, was also present in RS232 (unlike LPT), yet it never inspired the same confidence. Unfortunately, I2C or SMBus devices do not support hot-swapping, creating a limitation. Addressing a part of this issue, Linear Technology has recently introduced a component that handles the switching aspect.

Recent Innovation: Solving Hot-Swapping Challenges

A notable recent development in the realm of electronic components addresses the challenge of hot-swapping for I2C or SMBus devices. While USB familiarity has made device connection effortless, this convenience has been lacking in other interfaces. RS232, although similar, didn’t instill the same level of comfort. Notably, I2C or SMBus devices posed a hurdle due to their lack of hot-swappability. Linear Technology’s introduction of a component represents a significant step forward, resolving the switching part of this problem.

I2C Hot Swap Schematic Circuit Diagram

The LTC4300: Enabling Seamless Bus Expansion

The LTC4300 functions as a 2-wire interface buffer, ensuring signal isolation between peripherals and the bus. This unique feature permits the addition of new devices to the bus without causing any disruptions. The challenge lies in detecting bus inactivity and activating the interface chip to connect the peripheral. The buffer incorporates active pull-ups, allowing the use of high-value (10 kΩ) pull-up resistors. For more detailed information about the LTC4300, visit www.linear.com.

LTC4300 Series: Effortless Hot-Swapping for 2-Wire Buses

The LTC4300 series offers hot-swappable 2-wire bus buffers, enabling the insertion of I/O cards into a live backplane without compromising data and clock busses. Upon connection, LTC4300-1/LTC4300-2 provides bidirectional buffering, effectively isolating backplane and card capacitances. Special rise time accelerator circuitry* permits the use of weaker DC pull-up currents while meeting rise time requirements. During insertion, SDA and SCL lines are precharged to 1V, minimizing bus disturbances.

Features

  • Bidirectional Buffer for SDA and SCL Lines Increases Fanout
  • Prevents SDA and SCL Corruption During Live
  • Board Insertion and Removal From Backplane
  • Isolates Input SDA and SCL Lines From Output
  • Compatible with I2C, I2C Fast Mode and SMBus
  • Standards (Up to 400kHz Operation)
  • Low ICC Chip Disable: <1µA (LTC4300-1)
  • READY Open-Drain Output (LTC4300-1)
  • 1V Precharge on All SDA and SCL Lines
  • Supports Clock Stretching, Arbitration, and Synchronization
  • 5V to 3.3V Level Translation (LTC4300-2)
  • High Impedance SDA, SCL Pins for VCC = 0V
  • Small MSOP 8-Lead Package
Tags

Related Articles

Leave a Reply

Your email address will not be published.

Back to top button
Close
Close