Precise time management is the cornerstone of modern digital and intelligent systems. For example, smart door locks rely on accurate timing for automated locking/unlocking functions and event logging. The Real Time Clock (RTC) module provides a stable time reference, ensuring these features execute precisely. The RTC’s high - precision timestamping also records operational logs (e.g., access attempts, abnormal operations), enhancing security. Additionally, its ultra - low power consumption extends battery life in battery - powered devices like smart locks.

Corebai Microelectronics CBM1307

The CBM1307 is a BCD-based real-time clock with date and 56 bytes of battery-backed static RAM. It offers low power consumption and supports I2C bus access for address/data operations. The timing circuit calculates hours, minutes, seconds, days, months, and years, automatically adjusting for 31-day months and leap years (up to 2100). It operates in 24-hour or 12-hour format with AM/PM indicators. An integrated power control circuit detects supply interruptions and switches to battery backup mode, making it a reliable time management solution across industries.

CBM1307 Application Block Diagram

CBM1307 Product Features

l Counts seconds, minutes, hours, days, months, years, and leap years (up to 2100)

l 56 bytes of battery-backed RAM for data storage

l I2C interface (100KHz standard, 400KHz fast mode)

l Crystal oscillator circuit 无需 external resistors/capacitors

l Programmable square wave output

l Automatic main/backup power switching

l Battery backup current <500nA

l Industrial temperature range: -40°C to +85°C

CBM1307 Product Advantages

Low Power Consumption

 Battery Backup: <500nA current in backup mode, ideal for battery-powered devices.

 Power Management: Automatically switches to battery backup during mains failure, ensuring continuous timekeeping.

High Precision

 Uses a 32.768kHz crystal oscillator for accurate timing.

High Reliability

 Battery Backup: Maintains time for over 10 years during power outages.

 Data Protection: Write-protection and reverse-current prevention enhance reliability.

Simple Interface

 I2C compatibility enables seamless integration with other I2C devices.

Versatile Functions

 Time/Date: Supports 24-hour/12-hour formats and automatic date adjustments.

 Square Wave Output: Selectable frequencies (1Hz, 4kHz, 8kHz, 32kHz) for synchronization.

 56-Byte RAM: Non-volatile storage for critical data retention.

 Wide Temperature Range: Operates reliably in extreme conditions (-40°C to +85°C).

CBM1307 Product Applications

Computing

 Motherboard Clocks: Provides system time in desktops/laptops, even during shutdowns.

 OS Time Management: Supports task scheduling, file timestamping, and more.

Communication

 Base Station Timing: Ensures precise signal synchronization in mobile networks.

 Network Devices: Enables Network Time Protocol (NTP) in routers/switches.

Industrial Control

 Automation Lines: Logs production timestamps for quality control.

 Power Monitoring: Adds time stamps to equipment status data.

Emedded Systems

 Smart Appliances: Enables timers in refrigerators, air conditioners, and washing machines.

 Medical Devices: Records timestamped patient data in ECG machines and blood pressure monitors.

Consumer Electronics

 Digital Cameras: Adds timestamps to photos for organized browsing.

 Portable Media Players: Displays playback time and supports auto-shutdown timers.