BU9873FVT-GE2

Outline

The BU9873 is a CMOS real-time clock, which has a

built-in interrupt generation function. This product is

connected to the CPU via I 2 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.

Features

■ Connected to the CPU via I 2 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 Register)

■ ±30 Second Adjustment Function

■ Automatic Leap Year Recognition up to the Year

2099

■ Built-in Oscillation Stabilizing Capacitors (C G , C D )

■ High-Precision Oscillation Adjustment Circuit

Important Characteristics

■ Time Keeping Voltage 1.45V to 5.5V

■ Time Keeping Current 1 0.4µA (Typ)

(V DD =3V, Ta=+25°C)

■ Time Keeping Current 2 1.0µA (Max)

(V DD =3V, Ta=-40°C to +85°C)

■ Power Supply Voltage 1.8V to 5.5V

■ Access Frequency 1 100kHz (Max)

(V DD =1.8V to 2.5V)

■ Access Frequency 2 400kHz (Max)

(V DD =2.5V to 5.5V)

规格书BU9873FVT-GE2