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RX5C348A 参数 Datasheet PDF下载

RX5C348A图片预览
型号: RX5C348A
PDF下载: 下载PDF文件 查看货源
内容描述: 4线串行接口 [4-WIRE SERIAL INTERFACE]
分类和应用:
文件页数/大小: 45 页 / 1293 K
品牌: RICOH [ RICOH ELECTRONICS DEVICES DIVISION ]
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4-wire Serial Interface  
Rx5C348A/B  
OUTLINE  
The Rx5C348A/B 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. 0.35µA at 3V: Rx5C348A, TYP.0.55µA 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 32.768kHz 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. These models come in an ultra-compact SSOP10 (RS5C348A/B), SSOP10G  
(RV5C348A/B), TSSOP10G (RT5C348B)  
Package  
32-kHz Clock Output  
RS5C348A  
RS5C348B  
RV5C348A  
RV5C348B  
RT5C348B  
SSOP10 (Pin Pitch 0.5mm, Height1.25mm,  
6.4mm×3.5mm)  
SSOP10G (Pin Pitch 0.5mm, Height1.2mm,  
4.0mm×2.9mm)  
TSSOP10G (Pin Pitch 0.5mm, Height0.85mm,  
4.0mm×2.9mm)  
Controllable by command  
Keeping output enabled  
Controllable by command  
Keeping output enabled  
Keeping output enabled  
FEATURES  
Timekeeping supply voltage ranging from 1.45 to 5.5V  
Low power consumption  
Rx5C348A: 0.35µA TYP (0.8µA MAX) at VDD=3V  
Rx5C348B: 0.55µA TYP (1.0µA MAX) at VDD=3V  
Only four signal lines (CE, SCLK, SI, and SO) required for connection to the CPU.  
Maximum clock frequency of 2 MHz (with VDD = 5V)  
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)  
32-kHz clock output circuit (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.  
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  
Built-in oscillation stabilization capacitors (CG and CD)  
High precision oscillation adjustment circuit  
Ultra-compact SSOP10 (RS5C348A/B), SSOP10G (RV5C348A/B), TSSOP10G (RT5C348B)  
CMOS process  
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