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DS1340, DS1340C：I²C RTC，带有涓流充电器

I²C实时时钟，带有涓流充电器，可通过软件进行校准

The DS1340 is a real-time clock (RTC)/calendar that is pin compatible and functionally equivalent to the ST M41T00, including the software clock calibration. The device additionally provides trickle-charge capability on the VBACKUP pin, a lower timekeeping voltage, and an oscillator STOP flag. Block access of the register map is identical to the ST device. Two additional registers, which are accessed individually, are required for the trickle charger and flag. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. A built-in power-sense circuit detects power failures and automatically switches to the backup supply. The device is programmed serially through an I²C bidirectional bus.

关键特性 Enhanced Second Source for the ST M41T00 Completely Manages All Timekeeping Functions RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year Software Clock Calibration Oscillator Stop Flag Low-Power Operation Extends Battery Backup Run Time Low Timekeeping Voltage Down to 1.3V Automatic Power-Fail Detect and Switch Circuitry Trickle-Charge Capability Three Operating Voltage Ranges (1.8V, 3V, and 3.3V) Supports Systems Using Legacy and Modern Power Buses Surface-Mount Package with an Integrated Crystal (DS1340C) Saves Additional Space and Simplifies Design Simple Serial Port Interfaces with Most Microcontrollers Fast (400kHz) I2C Interface 8-Pin µSOP or SO Package Minimizes Required Space Underwriters Laboratories (UL®) Recognized

DS1340、DS1340C：典型工作电路 应用 医疗装置 销售终端机(POS)装置 便携式仪表 电信

数据手册DataSheet

关键参数

技术资料

• Tips for Writing Bulletproof Real-Time Clock Control Code
• State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks
• Intelligent Lighting Controller Measures Ambient Light and Tracks Time
• Demonstrating Green Technology with Apples, Oranges, Lemons, and Limes
• Oscillator Design Considerations for Low-Current Applications
• Selecting a Backup Source for Real-Time Clocks
• Using the DS32kHz with Maxim Real-Time Clocks
• Lithium Coin-Cell Batteries: Predicting an Application Lifetime
• Design Considerations for Maxim Real-Time Clocks
• Interfacing the DS1307 with an 8051-Compatible Microcontroller
• Using the Dallas Tricklecharge Timekeeper
• Crystal Considerations with Maxim Real-Time Clocks (RTCs)

质量和环境数据

• DS1340.pdf

相关产品

• DS1338：I²C RTC，带有56字节NV RAM
• DS1339：I²C串行实时时钟
• DS1307：64 x 8、串行、I²C实时时钟

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