BU9873 Datasheet, PDF (1/40 Pages) Rohm – I2C BUS Serial Interface RTC with High-precision Oscillation Adjustment

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
connected to the CPU via I²C 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
(V_DD=3V, Ta=+25°C)
■ Time Keeping Current 2
(V_DD=3V, Ta=-40°C to +85°C)
■ Power Supply Voltage
■ Access Frequency 1
(V_DD=1.8V to 2.5V)
■ Access Frequency 2
(V_DD=2.5V to 5.5V)
1.45V to 5.5V
0.4µA (Typ)
1.0µA (Max)
1.8V to 5.5V
100kHz (Max)
400kHz (Max)
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 ï½¥ Hour ï½¥ 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 (C_G, C_D)
■ High-Precision Oscillation Adjustment Circuit
Package
W (Typ) x D (Typ) x H (Max)
SOP8
MSOP8
5.00mm x 6.20mm x 1.71mm 2.90mm x 4.00mm x 0.90mm
SOP- J8
VSON008X2030
4.90mm x 6.00mm x 1.65mm _{2.00mm x 3.00mm x 0.60mm}
TSSOP-B8
3.00mm x 6.40mm x 1.20mm
○Product structure: Silicon monolithic integrated circuit
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product has no designed protection against radioactive rays
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TSZ02201-0919AGZ00010-1-2
13.Sep.2013 REV.001