RX8111CE A3

Real Time Clock Overview

The EPSON RX8111CE A3 is a real-time clock (RTC) integrated circuit designed for embedded systems. It features an SPI bus interface, distinguishing it from the I2C-based RX8111CE AB variant. The device operates within a supply voltage range of 1.6V to 5.5V and maintains timekeeping with a maximum current consumption of 3µA at 3V. It supports date formats including YY-MM-DD and HH:MM:SS. The component is housed in a surface-mount package suitable for automated assembly and functions reliably across a temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• SPI Bus Interface: Utilizes Serial 4-Wire SPI communication protocol for data transfer.
• Low Power Consumption: Maximum timer current draw of 3µA at 3V supply.
• Wide Operating Voltage: Supports main power supply from 1.6V to 5.5V.
• Integrated Backup Switching: Hardware-managed automatic switching between main power and backup battery.

Real Time Clock Applications

• Embedded systems requiring precise timekeeping via SPI interface
• Industrial equipment operating in wide temperature environments (-40°C to +85°C)
• Portable devices utilizing low-voltage power supplies (1.6V minimum)

Real Time Clock Procurement Notes

Verify the specific suffix 'A3' during procurement to ensure the SPI interface variant is selected, as it differs functionally from the I2C version (AB). Confirm packaging requirements, such as cut tape or reel quantities, against manufacturer specifications. Check RoHS compliance status and moisture sensitivity level (MSL 1) for storage and handling procedures prior to soldering.

Real Time Clock Selection Notes

Select the RX8111CE A3 when the host microcontroller utilizes an SPI interface rather than I2C. Ensure the system design accommodates the 1.6V to 5.5V input voltage range. Consider the 10-SMD package dimensions (3.2x2.5mm) for PCB layout constraints. Verify that the application requires the specific alarm and RAM features documented for this series.

Real Time Clock Part Context

This component belongs to the Epson RX4111CE/RX8111CE family of real-time clocks. The 'A3' suffix denotes the SPI interface configuration, whereas other suffixes like 'AB' indicate I2C interfaces. These chips share core timing accuracy and low-power characteristics but differ in communication protocols. The part is manufactured by Epson Timing.

Real Time Clock Replacement Considerations

Direct replacements must match the SPI interface and pinout. The RX4111CE series shares similar form factors but requires verification of electrical parameters. Cross-model substitution with I2C variants (e.g., RX8111CE AB) is not electrically compatible without interface translation. Consult official datasheets for pin-to-pin compatibility before integration.