ZDU0110RHX

Overview

The Zilog ZDU0110RHX is a single-chip CMOS Digital UART providing full-duplex asynchronous communication via an I2C interface. It features two independent UART channels, each equipped with a 64-byte receive FIFO and a 64-byte transmit FIFO. The device integrates a 4 kbit EEPROM for data storage and General-Purpose Input/Output (GPIO) pins with programmable interrupt capabilities. An internal 8 MHz oscillator eliminates the need for external crystals. It operates on a single power supply ranging from 1.8 V to 5.0 V and supports I2C bus speeds up to 400 kHz.

Feature Summary

• Dual UART channels with dedicated 64-byte FIFOs for simultaneous transmission and reception
• Integrated 4 kbit EEPROM accessible via standard I2C protocols
• Internal 8 MHz oscillator removes requirement for external clock components
• Programmable GPIO pins with configurable interrupts and debouncing options

Applications

• Point of Sale devices
• Communication bridges
• Process control systems
• Building automation control
• Terminal servers

Procurement Notes

Verify the specific package configuration matches the required pinout, as the ZDU0110 family includes multiple variants such as RFX, RJX, and QUX. Confirm that the system design accommodates the shared I2C address pins which double as interrupt lines during initialization. Ensure the host controller supports the stacked write commands if configuring multiple registers in a single transaction.

Selection Notes

Select this component when space-constrained designs require dual UART interfaces without external crystal oscillators. It is suitable for applications needing integrated non-volatile memory and flexible GPIO expansion controlled via a simple two-wire interface. Consider the available interrupt lines and watermark settings if real-time notification of buffer states is critical for the host processor.

Part Context

The ZDU0110RHX belongs to Zilog's Digital UART series, designed to simplify serial communication integration. It consolidates UART functionality, EEPROM storage, and GPIO expansion into a single package. This integration reduces board complexity and component count compared to discrete solutions, making it ideal for embedded systems requiring reliable asynchronous data transfer.

Replacement Considerations

Direct replacements within the same family include ZDU0110RFX, ZDU0110RJX, and ZDU0110QUX. These variants differ primarily in package type and pin count. Verify pin compatibility before substitution, as the number of available GPIO and UART pins varies across packages.