R2223L-E2
Overview
The R2223L-E2 is an ultra-low power CMOS Real Time Clock (RTC) IC designed for high-efficiency timekeeping in portable electronics. It features an I2C interface, automatic leap year adjustment through 2099, and integrated oscillation adjustment circuitry to maintain high precision. Operating down to 0.9V with a typical current consumption of just 0.18uA, it is optimized for long-term battery-backed applications.
Why Choose This Part
The primary advantage is its extremely low power consumption and wide operating voltage range of 1.5V to 5.5V for standard operation, with timekeeping supported down to 0.9V. It simplifies hardware design by integrating oscillation stabilization capacitors and providing a 32-kHz CMOS clock output pin for external MCU synchronization.
Applications
Key Specifications
Getting Started
To integrate this RTC, connect the SCL and SDA pins to an I2C master and provide a 32.768kHz crystal to the oscillation circuit. Use the precision adjustment register to calibrate for crystal frequency deviations caused by PCB layout or temperature. Ensure the VDD supply is decoupled with a ceramic capacitor placed close to the QFN-12 package.
