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RT5C348B - 4-wire Serial Interface

Description

Symbol CE Item Chip enable Input Description The CE pin is used for interfacing with the CPU.

Should be held high to allow access to the CPU.

Incorporates a pull-down resistor.

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.

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Datasheet Details

Part number RT5C348B
Manufacturer RICOH
File Size 714.67 KB
Description 4-wire Serial Interface
Datasheet download datasheet RT5C348B Datasheet

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Full PDF Text Transcription

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12345 OUTLINE ’11.04.13 4-wire Serial Interface Rx5C348A/B 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).
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