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BU9873 - I2C BUS Serial Interface RTC

Description

Pin No.

The 32KOUT pin is used to output 32.768 kHz clock pulses, which is controlled by an internal register.

This pin is enabled during power-on from 0V, and is CMOS push-pull output.

Features

  • 2 Connected to the CPU via I C Interface Time (Hour ･ Minute ･ Second, Selectable 12-Hour and 24-Hour Mode Setting) Calendar (Year･Month･Day･Week) Periodic Interrupt Function (Output from INTRB, Ranging from 1 Second to 1 Month) Alarm Interrupt Function (Day-of-Week ･ Hour ･ Minute in Setting Format, Output from INTRB) Oscillation Halt Sensing Function 32.768 kHz Clock Output (Output from 32KOUT with Control Pin) ±30 Second Adjustment Function Automatic Leap Year Recognit.

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Datasheet Details

Part number BU9873
Manufacturer ROHM
File Size 1.22 MB
Description I2C BUS Serial Interface RTC
Datasheet download datasheet BU9873 Datasheet

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Full PDF Text Transcription

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Datasheet Real-Time Clock (RTC) series I2C BUS Serial Interface RTC with High-precision Oscillation Adjustment BU9873 Outline The BU9873 is a CMOS real-time clock, which has a built-in interrupt generation function. This product is 2 connected to the CPU via I C interface, and configured to perform serial transmission of time and calendar data to the CPU. A high-precision oscillation adjustment circuit is also integrated, which is capable of adjusting time counts with digital method, and correcting deviations in the oscillation frequency of the crystal oscillator. Important Characteristics ■ ■ ■ ■ ■ ■ Time Keeping Voltage Time Keeping Current 1 (VDD=3V, Ta=+25°C) Time Keeping Current 2 (VDD=3V, Ta=-40°C to +85°C) Power Supply Voltage Access Frequency 1 (VDD=1.8V to 2.
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