Thông số kỹ thuật
Nhà sản xuất: STMicroelectronics
Device Type: Automotive grade real-time clock calendar IC with frequency calibration capability, tape and reel surface mount component
Thông số kỹ thuật điện
Primary supply voltage range: 2.7 V to 5.5 V
Backup battery input voltage range: 1.2 V to 5.5 V
Typical current draw under battery backup mode: 350 nA
Integrated oscillator circuit for 32.768 kHz crystal, digital trimming available to adjust clock accuracy
Time and calendar data includes seconds, minutes, hours, weekday, date, month and year, with automatic leap year calculation
Two separate programmable alarm channels for interrupt generation
Multiple configurable square-wave output frequencies for external clock reference
Operating temperature range: -40°C to +125°C
Package form: 8-pin narrow SOIC surface mount package
Main Functional Characteristics
Built-in automatic calendar logic adapts to varying days in each month and leap year adjustments without intervention from main microcontroller
Digital trimming function compensates timing drift brought by crystal deviation and ambient temperature fluctuation, maintaining long-term precise timekeeping
Two independent alarm modules output hardware trigger signals once scheduled time is reached, supporting timed wake-up and periodic control demands
Programmable square wave signal can be used as timing clock source for peripheral circuit modules
Internal power switching unit seamlessly shifts power supply between main system voltage and backup battery when main power cuts off, no time loss occurs during the switchover
Power-failure status register keeps track of power-down events for system fault review
Enhanced ESD and transient voltage protection on all pins to withstand unstable automotive power environments
Ultra-low standby power consumption enables multi-year continuous time retention powered by a small coin cell
Halogen-free packaging materials conform to RoHS automotive environmental standards
Các tình huống ứng dụng điển hình
Automotive instrument panel real-time time display and mileage timestamp recording
Vehicle body control module event log time marking
On-board infotainment system clock and scheduled function control
Commercial vehicle fleet tracking equipment time synchronization
Automotive sensor data acquisition timestamp calibration
Various automotive electronic control units time reference configuration
