RS5C338A数据手册集成电路（IC）的实时时钟规格书PDF

描述 Description

The Rx5C338A are CMOS real-time clock ICs connected to the CPU by three signal lines CE (Chip Enable), SCLK (Serial Clock), and SIO (Serial Input/Output), and configured to perform serial transmission of time and calendar data to the CPU. These models incorporate different functional circuits.

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 circuits generate interrupt signals at preset times.

The oscillation circuit is driven under constant voltage so that fluctuations in oscillation frequency due to voltage are small and supply current is also small (TYP. 0.35 µA at 3 volts).

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-kHz clock output function is intended to output sub-clock pulses for the external microcomputer.

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：Typ. 0.35 µA (VDD=3V)；
• Connected to the CPU：Three signal lines (SCLK, SIO, and CE),Maximum clock frequency of 2 MHz (with VDD of 5 V)；
• 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 circuit；
• 2 alarm 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 (CMOS output, equipped with a control pin)；
• 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

RS5C338A属于集成电路（IC）的实时时钟。由制造生产的RS5C338A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。