AB-RTCMC-32.768KHZ-EOZ9-S3-DBT

Overview

The Abracon AB-RTCMC-32.768KHZ-EOZ9-S3 is a digitally temperature-compensated real-time clock (DTCXO) module with an I2C interface. It provides year, month, day, weekday, hours, minutes, and seconds tracking in a compact 10-SMD package measuring 3.7 x 2.5 x 0.9 mm. The device operates on a supply voltage of 1.4V to 5.5V and supports fast mode SCL frequencies up to 400kHz. Key features include integrated alarm functions, a programmable CLKOUT pin, EEPROM storage, and main-to-backup power switchover with trickle charging capabilities.

Feature Summary

• Digitally Temperature Compensated Crystal Oscillator (DTCXO) for high time accuracy across wide temperature ranges
• Integrated 8-byte EEPROM and SRAM for data retention
• Programmable CLKOUT output supporting 32.768 kHz, 1024 Hz, 32 Hz, or 1 Hz frequencies
• Main Power Supply to Backup Battery switchover circuitry with configurable trickle charger

Applications

• Communication and measuring equipment requiring precise timekeeping
• Commercial and industrial applications operating in extreme temperatures
• Automotive electronics systems
• Wireless communications devices
• Credit cards with security technology

Procurement Notes

Verify the specific time accuracy option (A or B) required for the application, as this affects performance at different temperature ranges. Confirm packaging preferences between Tape & Reel (TR) and Cut Tape (CT), noting that standard reels contain 1000 pieces. Ensure compatibility with the 1.4V to 5.5V supply voltage range for both VDD and VBACK pins.

Selection Notes

Select Option A for tighter time accuracy specifications within the -40°C to +125°C range compared to Option B. Consider the built-in thermometer precision (±4°C typical from -40°C to +85°C) if environmental monitoring is needed. Evaluate the need for the CLKOUT feature; if unused, the CLKOE pin must be tied to GND. Verify that the system design accommodates the recommended 10 nF decoupling capacitor near the VDD pin.

Part Context

This component belongs to the AB-RTCMC series of real-time clock modules by Abracon LLC. Unlike standard RTCs, this model incorporates DTCXO technology to compensate for frequency drift due to temperature changes without external components. It replaces discrete crystal and oscillator solutions with a fully enclosed module containing the tuning fork crystal.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. When replacing, ensure the new component matches the 10-SMD module footprint (3.7 x 2.5 x 0.9 mm) and I2C interface timing requirements.

FAQ

What is the maximum SCL clock frequency supported?

The module supports an I2C fast mode SCL clock frequency of up to 400 kHz.

How does the device handle power loss?

It includes main power supply to backup battery switchover circuitry with a trickle charger to maintain timekeeping when the main supply fails.

What is the typical current consumption in time-keeping mode?

At VDD = 3.0V and Tamb = 25°C, the typical supply current is 800 nA.

Can the CLKOUT pin be used for interrupt signals?

Yes, the CLKOUT pin can be configured via Control_1 bit7 to function as either a clock output or an interrupt signal (open-drain).