描述 Description

The R2223 is a CMOS real-time clock IC connected to the CPU by two signal lines, SCL, SDA, 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. 0.18 μA at 3V). 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 supply voltage monitoring threshold settings. The 32.768kHz clock output function (CMOS output with control pin) 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. Since the package for these ICs are TSSOP10G or QFN018018-12, high density mounting of ICs on boards is possible.

特性 Features

? Minimum Timekeeping supply voltage：Typ. 0.6 V to 5.5 V (Worst: 0.9 V to 5.5 V); VDD pin；
? Supply Current：Typ. 0.18 μA (VDD=3V)；
? Connected to the CPU：Two signal lines (SCL, SDA)；
? 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)；
? With Power-on flag to prove that the power supply starts from 0 V；
? 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；
? Built-in Circuits：High precision oscillation adjustment；
? Oscillation stabilization capacitors (CG and CD)；
? Clock Output：32-kHz (CMOS push-pull output with control pin)；
? Packages：QFN018018-12, TSSOP10G；

應(yīng)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

簡(jiǎn)介

R2223屬于集成電路（IC）的實(shí)時(shí)時(shí)鐘。由制造生產(chǎn)的R2223實(shí)時(shí)時(shí)鐘實(shí)時(shí)時(shí)鐘 (RTC) 為幾乎所有需要保持精確時(shí)間的電子設(shè)備提供時(shí)間和/或日期信息。時(shí)鐘類型有二進(jìn)制計(jì)數(shù)器、時(shí)鐘/日歷/監(jiān)控器、歷時(shí)計(jì)時(shí)器、幻時(shí)鐘芯片、便攜式系統(tǒng)控制器、溫度記錄器、時(shí)間事件記錄器和計(jì)時(shí)器時(shí)鐘外設(shè)。其包含 2 B 至 2 MB 不等的存儲(chǔ)器，接口選項(xiàng)有 I2C、并行、串行、SPI、1 線式、2 線式、3 線式和 4 線式。