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DS1302：带涓流充电的时钟芯片

The DS1302 trickle-charge timekeeping chip contains a real-time clock/calendar and 31 bytes of static RAM. It communicates with a microprocessor via a simple serial interface. The real-time clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with an AM/PM indicator. Interfacing the DS1302 with a microprocessor is simplified by using synchronous serial communication. Only three wires are required to communicate with the clock/RAM: CE, I/O (data line), and SCLK (serial clock). Data can be transferred to and from the clock/RAM 1 byte at a time or in a burst of up to 31 bytes. The DS1302 is designed to operate on very low power and retain data and clock information on less than 1µW. The DS1302 is the successor to the DS1202. In addition to the basic timekeeping functions of the DS1202, the DS1302 has the additional features of dual power pins for primary and backup power supplies, programmable trickle charger for VCC1, and seven additional bytes of scratchpad memory.

关键特性 Completely Manages All Timekeeping Functions Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100 31 x 8 Battery-Backed General-Purpose RAM Simple Serial Port Interfaces to Most Microcontrollers Simple 3-Wire Interface TTL-Compatible (VCC = 5V) Single-Byte or Multiple-Byte (Burst Mode) Data Transfer for Read or Write of Clock or RAM Data Low Power Operation Extends Battery Backup Run Time 2.0V to 5.5V Full Operation Uses Less Than 300nA at 2.0V 8-Pin DIP and 8-Pin SO Minimizes Required Space Optional Industrial Temperature Range: -40°C to +85°C Supports Operation in a Wide Range of Applications Underwriters Laboratories® (UL) Recognized

DS1302：典型工作电路

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
• 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
• Using the Dallas Tricklecharge Timekeeper
• Crystal Considerations with Maxim Real-Time Clocks (RTCs)

质量和环境数据

• DS1302.pdf

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