RV5C348B数据手册集成电路（IC）的实时时钟规格书PDF

描述 Description

The Rx5C348 are CMOS real-time clock ICs connected to the CPU by four signal lines, CE, SCLK, SI, SO, and configured to perform serial transmission of time and calendar data to the CPU. The periodic interrupt circuit is configured to generate interrupt signals with six selectable interrupts ranging from 0.5 seconds to 1 month. The 2 alarm interrupt circuits generate interrupt signals at preset times. As the oscillation circuit is driven under constant voltage, fluctuation of the oscillator frequency due to supply voltage is small, and the time keeping current is small (TYP. 0.35 µA at 3V: Rx5C348A, TYP. 0.55 µA at 3V: Rx5C348B). The oscillation halt sensing circuit can be used to judge the validity of internal data in such events as power-on; The supply voltage monitoring circuit is configured to record a drop in supply voltage below two selectable supply voltage monitoring threshold settings. The 32.768 kHz clock output function (N-channel open drain output) is intended to output sub-clock pulses for the external microcomputer. The 32-kHz clock circuit can be disabled by certain register settings for the Rx5C348A but cannot be disabled by any register settings for the Rx5C348B. The oscillation adjustment circuit is intended to adjust time counts with high precision by correcting deviations in the oscillation frequency of the crystal oscillator. SSOP10 and SSOP10G packages are available.

特性 Features

• Timekeeping supply voltage：1.45 to 5.5 V；
• Supply Current：Rx5C348A: Typ. 0.35 µA (VDD=3V),Rx5C348B: Typ. 0.55 µA (VDD=3V)；
• Connected to the CPU：Four signal lines (CE, SCLK, SI, and SO), Maximum clock frequency of 2 MHz (with VDD = 5V)；
• Functions：Time counters (counting hours, minutes, and seconds) and calendar counters (counting years, months, days,and weeks) (in BCD format)；
• Interrupt circuit configured to generate interrupt signals (with interrupts ranging from 0.5 seconds to 1 month) to the CPU and provided with an interrupt flag and an interrupt halt；
• 2 alarm interrupt circuits (Alarm_W for week, hour, and minute alarm settings and Alarm_D for hour and　minute alarm settings)；
• Oscillation halt sensing circuit which can be used to judge the validity of internal data；
• Supply voltage monitoring circuit with two supply voltage monitoring threshold settings；
• Automatic identification of leap years up to the year 2099；
• Selectable 12-hour and 24-hour mode settings；
• Clock Output：32-kHz (Nch. open drain output),The Rx5C348A is designed to disable 32-kHz clock output in response to a command from the host computer and the Rx5C348B is designed to keep 32-kHz output enabled.；
• Built-in Circuits：Oscillation stabilization capacitors (CG and CD)；
• High precision oscillation adjustment；
• Packages：SSOP10G, SSOP10；

应用 Application

• Home appliances such as refrigerators, rice cookers, and electric pots
• Digital appliances such as laptops, digital TVs, DSCs, camcorders, mobile phones, and private LAN system
• Office appliances such as copiers, printers, facsimiles, scanners, and projectors

简介

RV5C348B属于集成电路（IC）的实时时钟。由制造生产的RV5C348B实时时钟实时时钟 (RTC) 为几乎所有需要保持精确时间的电子设备提供时间和/或日期信息。时钟类型有二进制计数器、时钟/日历/监控器、历时计时器、幻时钟芯片、便携式系统控制器、温度记录器、时间事件记录器和计时器时钟外设。其包含 2 B 至 2 MB 不等的存储器，接口选项有 I2C、并行、串行、SPI、1 线式、2 线式、3 线式和 4 线式。