المواصفات
الشركة المصنعة: STMicroelectronics
Device Type: Precision real-time clock calendar module with integrated digital trimming function, surface mount component delivered on tape and reel
Electrical Parameters
Main operating supply voltage range: 2.7 V to 5.5 V
Backup power input range for battery standby: 1.2 V to 5.5 V
Typical standby current under battery power: 350 nA
Built-in 32.768 kHz crystal oscillator circuit with software adjustable frequency trimming
Timekeeping data covers seconds, minutes, hours, day, date, month and year with automatic leap year compensation
Two independent programmable alarm interrupt channels
Square wave output signal with selectable frequencies
Operating temperature range: -40 °C to +85 °C
Package specification: 8-pin SOIC narrow body surface mount package
الميزات الأساسية
Built-in comprehensive calendar logic that automatically adjusts month lengths and leap year dates without host processor calculation
Digital frequency tuning function corrects clock deviation caused by crystal tolerance and temperature changes to achieve long-term accurate time counting
Two independent alarm units can trigger hardware interrupt signals upon preset time arrival for timed wake-up control
Configurable square wave output serves as external timing clock reference for peripheral circuits
Internal power switching circuit automatically switches power source between main system power and backup coin cell when main power fails, no time loss during power transition
Integrated power failure detection register records power-down occurrence for system status checking
All input pins are equipped with ESD protection to resist static interference in electronic equipment
Ultra-low power consumption during battery backup ensures years of continuous time maintenance with a single coin cell
Halogen-free packaging materials comply with global environmental standards
سيناريوهات التطبيق النموذجية
Industrial control equipment system timestamp recording
Smart meters time calibration and billing cycle management
Household intelligent appliances timed switch control
Portable testing instruments running time logging
IoT wireless nodes scheduled data uploading
Embedded devices system real-time clock reference
