基于ISL3300x设计的I2C总线扩展方案

ISL3300x评估板

ISL33001MSOPEVAL1Z, ISL33002MSOPEVAL1Z, ISL33003MSOPEVAL1Z Evaluation Board

The ISL33001MSOPEVAL1Z, ISL33002MSOPEVAL1Z, and ISL33003MSOPEVAL1Z evaluation board is designed to provide a quick and easy method for evaluating the ISL33001, ISL33002, ISL33003 2-Channel Bus Buffer. It is recommended to understand the operation of the IC for a complete utilization of the evaluation board.

The evaluation board is developed to evaluate the performance of the buffer used in a typical application.

TheISL3300xMSOP package IC is soldered onto the evaluation board and is designated as U1. A typical application of theISL3300xis anI2Cbus buffer. The evaluation board contains all the necessary components to interface the buffer to anI2Cbus.

Discrete NMOS transistors are used to produce the pull-down functions of a wired-AND bus. Each SDA/SCL pin on the buffer is connected to an external open-drain NMOS transistor. The evaluation board also contains connections for the bus pull-up resistor and load capacitance. The logic input pins on the ISL3300x IC can be held logic High by a pull-up resistor or driven dynamically with an external logic source.

ISL3300x评估板主要特性:

Evaluation Board for ISL33001IUZ, ISL33002IUZ, and ISL33003IUZ IC in MSOP Package

+2.3V to +5.5V Supply Operation

Configured to operate inI2Cenvironment

Two Channel Supply for Level Shifting Applications (ISL33002 and ISL33003)

On-Board Discrete NMOS Open-Drain Transistors Connected to SDA/SCL Pins

3V Logic for NMOS Transistor Gate

On-Board Discrete Bus Pull-Up Resistors and Load Capacitance on SDA/SCL Pins

Convenient Test Points on SDA/SCL pins


图3. ISL3300x评估板外形图

图4. ISL3300x评估板电路图

ISL3300x评估板材料清单(BOM):