RV5C348 系列

4线串口实时时钟IC

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概述
规格
技术资料
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概述

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.

规格

计时电源电压范围	1.45 V to 5.50 V
电源电流	RV5C348A: 0.35 µA (VDD = 3 V) RV5C348B: 0.55 µA (VDD = 3 V)
连接到CPU	Four Signal Lines (SCLK, SI, SO, CE), Serial Interface, Maximum Clock Frequency: 2 MHz (VDD = 5 V)
时钟输出	32.768 kHz RV5C348A: Nch Open Drain Output Controllable by Command RV5C348B: Nch Open Drain Output Keeping Output Enable
封装	SSOP10G

保护回路/功能

ECO	Clock Adjust	OSC Halt Sensing	Supply Voltage Monitoring Circuit	Automatic Identification of Leap Years	Selectable 12-hour and 24-hour	Backup Switch

功能说明

ECO	ECO Function
Clock Adjust	Clock Adjust Function
OSC Halt Sensing	OSC Halt Sensing Function
Supply Voltage Monitoring Circuit	Supply Voltage Monitoring Function
Automatic Identification of Leap Years	Automatic Identification of Leap Years
Selectable 12-hour and 24-hour	Selectable 12-hour and 24-hour
Built-in VD with Delay Time	Built-in VD with Delay Time

功能说明

ECO	ECO Function
Clock Adjust	Clock Adjust Function
OSC Halt Sensing	OSC Halt Sensing Function
Supply Voltage Monitoring Circuit	Supply Voltage Monitoring Function
Automatic Identification of Leap Years	Automatic Identification of Leap Years
Selectable 12-hour and 24-hour	Selectable 12-hour and 24-hour
Built-in VD with Delay Time	Built-in VD with Delay Time