RX4111CE AB

Real Time Clock Overview

The Epson RX4111CE AB is a real-time clock (RTC) module featuring an integrated 32.768 kHz crystal within a compact 3.2 mm x 2.5 mm surface-mount package. It utilizes a Serial 4-Wire SPI interface for data communication and supports a supply voltage range of 1.6 V to 5.5 V. The device incorporates automatic power switching between the main supply (VDD) and a backup source (VBAT), consuming approximately 100 nA in battery mode. Key technical specifications include selectable output frequencies of 32.768 kHz, 1024 Hz, or 1 Hz, and an operating temperature range extending from -40°C to +85°C.

Real Time Clock Feature Summary

• Integrated 32.768 kHz crystal oscillator eliminating external components
• SPI bus interface with chip enable control
• Automatic power switching between VDD and backup battery
• Configurable wake-up timer and alarm functions

Real Time Clock Applications

• Security systems requiring precise timekeeping
• Wearable electronic devices
• Industrial automation controllers
• IoT sensor nodes

Real Time Clock Procurement Notes

Verify the specific suffix 'AB' against official Epson documentation to confirm accuracy grade and packaging configuration. Suffixes often denote variations in tolerance or reel quantity. Confirm RoHS compliance status and lead times directly with authorized distributors prior to ordering.

Real Time Clock Selection Notes

Select this component when space constraints require an integrated crystal solution. Ensure the host system supports the SPI protocol and provides adequate voltage levels. Consider the ±23 ppm accuracy typical for this series if high precision is not required. Verify that the backup battery voltage falls within the specified operational limits.

Real Time Clock Part Context

This part belongs to the Epson RX4111CE family of ultra-low-power RTCs. It shares the same physical footprint and core functionality as variants like the RX4111CE B3 and A3, differing primarily in manufacturing lot codes, specific accuracy grades, or tape-and-reel packaging quantities defined by the manufacturer's suffix conventions.

Real Time Clock Replacement Considerations

Direct replacements include other RX4111CE variants such as RX4111CE B3 or RX4111CE A3, provided the accuracy requirements match. For I2C interfaces, the RX8111CE offers similar features but requires software adaptation due to the different communication protocol.