P82B96D

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The P82B96D is an I2C-bus buffer, originally developed to simplify a system-level design by allowing additional circuitry to be added without despoiling the environment. It operates using two simple commands: a “repeated start” command and a “load byte” command. The former sets a starting position in the register, while the latter is used to write individual bytes of data to the buffer.

The P82B96D is used in interface and signal buffering, repeaters, splitters, and related applications. It helps in connecting or “translating” between two different types of communication interfaces, such as I2C-bus to universal asynchronous receiver/transmitter (UART), or I2C-bus to Ethernet. As a buffer, it helps reduce line noise and potential signal integrity issues. As a repeater, it amplifies signals, allowing for longer cable runs and eliminates reflections and ringing.

The working principle of P82B96D is simple. The I2C-bus is an open-collector communication interface, which means that the data line (SDA) is either at logic ‘0‘ or High Impedance (Hi-Z). The P82B96D adds a physical layer buffering element to the interface, ensuring that the signal remains valid on both sides of the interface. This makes it suitable for links in longer cable runs and also helps reduce line noise and reflectivity. In addition to buffering, the device can also be used as a repeater to extend the transmission range. The P82B96D can repeat the signal up to five times, thereby providing a simple and repeatable method of increasing the signal strength.

The P82B96D also incorporates a basic fault detection system. An array of multi-state status LED’s indicate the operational status of the device and provide diagnostic information. In addition to diagnostics, the device also features an adjustable slew-rate control which allows the user to select the speed of data transmission. This helps to optimize signal integrity and reduces the possibility of errors due to crosstalk or interference.

In conclusion, the P82B96D is an ideal choice for interfacing and signal buffering, repeaters, splitters, and related applications. It is a simple and reliable solution for improving signal integrity and extending transmission ranges, which makes it suitable for a variety of applications. With its adjustable slew-rate control and fault-detection system, it helps reduce the risk of signal errors and ensure optimal performance.

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