Analog Devices LTC4306 | Demoboard EVAL-LTC4306-PMDZ

Description

The EVAL-LTC4306-PMDZ features LTC4306, a 4-channel, 2-wire I2C bus and SMBus compatible multiplexer having bus buffers that provide capacitive isolation between the upstream bus and downstream buses. This evaluation board provides 6-pin PMOD connectors for upstream and downstream connection for compatibility with PMOD form factors such as EVAL-ADICUP3029, an Arduino based Wireless Development Platform for Internet of Things applications based on an ultra-low power ARM Cortex-M3 processor. Pmod™ is the Digilent defined standard of Peripheral Modules, small I/O interface boards that offer an ideal way to extend the capabilities of programmable logic and microcontroller boards. They allow sensitive signal conditioning circuits and high-power drive circuits to be placed where they are most effective - near sensors and actuators.Through software control, the EVAL-LTC4306-PMDZ connects the upstream 2-wire bus to any desired combination of downstream buses, i.e. (SCL1, SDA1 : SCL4, SDA4). Each bus can be pulled up to a supply voltage ranging from 2.7V to 5.5V, independent or dependent of the LTC4306 supply voltage by placing jumpers in different settings. The downstream buses are also provided with their own ALERT_N input pins for fault reporting.Programmable timeout circuitry disconnects the downstream buses if the bus is stuck low. When activated, rise time accelerators source currents into the 2-wire bus pins during rising edges to reduce rise time. Two general purpose input/output (GPIO) pins (accessible via the P3 connector (Not soldered)) can be configured as inputs, open-drain outputs or push-pull outputs. LEDs on the board such as RDY, GP1 and GP2 allow fault monitoring and easy signal tracing. The reset or the ENABLE pin restores all device features to their default states when driven low and opens all the FET switches that connect the upstream to the downstream buses. Only three address pins (accessible via the ADR0, ADR1 and ADR3 pin headers) provide 27 distinct I2C addresses!

Features

• 1:4 2-Wire Multiplexer/Switch
• Connect SDA and SCL Lines with 2-Wire Bus Commands
• Supply Independent Bidirectional Buffer for SDA and SCL Lines Increases Fan-Out
• Programmable Disconnect from Stuck Bus
• Compatible with I2C and SMBus Standards
• Rise Time Accelerator Circuitry
• SMBus Compatible ALERT Response Protocol
• Two General Purpose Inputs-Outputs
• Prevents SDA and SCL Corruption During Live Board
• Insertion and Removal from Backplane
• ±10kV Human Body Model ESD Ruggedness
• 24-Lead QFN (4mm × 5mm) and SSOP Packages

Typical applications

• For programmable logic and microcontroller boards

More information

• Datasheet
• IC product information