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AB-RTC-TN-32.768KHZ-2-T1

AB-RTC-TN-32.768KHZ-2-T1

Abracon LLC
Real Time Clock (RTC) IC Clock/Calendar I2C 8-WCDFN
Active1,637 in stock
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Overview

The AB-RTC-TN-32.768KHZ-2-T1 is an ultra-low power Real Time Clock (RTC) module with an integrated 32.768 kHz crystal resonator and factory-calibrated temperature compensation. It operates across a wide supply voltage range from 1.5V to 5.5V while maintaining a typical timekeeping current as low as 240nA at 3V. This IC features an external event input with a hardware timestamp function, making it ideal for logging and security applications.

Why Choose This Part

The integrated crystal resonator eliminates the need for external tuning capacitors and simplifies PCB layout while ensuring high timing accuracy. Its extremely low current consumption (600nA-700nA max) and 5V-tolerant I2C interface allow for easy integration into both low-voltage battery systems and standard 5V industrial controllers.

Applications

Utility Metering
Provides highly accurate timekeeping for smart meters with minimal impact on battery life over a 10-15 year service life.
IoT Data Loggers
Utilizes the external event input to capture and timestamp physical triggers or sensor wake-up events even while the main MCU is in deep sleep.
Battery-Powered Wearables
Fits within space-constrained designs due to the integrated crystal and small 3.2mm x 1.5mm WCDFN package.
Industrial Automation
Provides reliable alarm interrupts and leap year calculations for scheduling maintenance or logging industrial faults.

Key Specifications

Type Clock/Calendar
Features Alarm, Leap Year
Interface I2C
Date Format YY-MM-DD-dd
Time Format HH:MM:SS:hh
Mounting Type Surface Mount
Package / Case 8-WCDFN
Voltage - Supply 1.5V ~ 5.5V
Operating Temperature -40degC ~ 85degC
Supplier Device Package 8-CLCC (3.2x1.5)
Current - Timekeeping (Max) 600nA ~ 700nA @ 1.5V ~ 5V

Getting Started

To evaluate this RTC, connect the I2C SDA and SCL lines to your microcontroller and provide a stable VDD between 1.5V and 5.5V. Use the factory-calibrated frequency settings to ensure accuracy without the need for manual crystal trimming. Software implementation involves writing to the I2C registers to set the HH:MM:SS:hh time and configuring the interrupt pins for alarm or event-timestamping functions.

Also Consider

DS3231 Analog Devices / Maxim Integrated - Features an integrated Temperature-Compensated Crystal Oscillator (TCXO) for superior accuracy across the full industrial temperature range.