深圳市辉锦电子有限公司

Outline

The 9873 is a CMOS real-time clock, which has a built-in  interrupt  generation  function.  This  product   is connected to the CPU via I2C interface, and configured toperform 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.

Features

• Connected to the CPU via I2C 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 Recognition up to the Year 2099

• Built-in Oscillation Stabilizing Capacitors (CG, CD)

• 
  

  High-Precision Oscillation Adjustment Circuit

  
  

Important Characteristics

• Time Keeping Voltage             1.45V to 5.5V

• Time Keeping Current             1 0.4μA (Typ)         (VDD=3V, Ta=+25°C)

• Time Keeping Current 2          1.0μA (Max)             (VDD=3V, Ta=-40°C to +85°C)

• Power Supply Voltage             1.8V to 5.5V

• Access Frequency 1               100kHz (Max)           (VDD=1.8V to 2.5V)

• Access Frequency 2               400kHz (Max)           (VDD=2.5V to 5.5V)

Package    W(Typ)×D(Typ)×H(MAX)

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