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BU9873 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BU9873
기능 I2C BUS Serial Interface RTC
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BU9873 데이터시트, 핀배열, 회로
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
(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 2.5V)
Access Frequency 2
(VDD=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 (YearMonthDayWeek)
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
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.
TSZ2211114001
This product has no designed protection against radioactive rays
1/37
TSZ02201-0919AGZ00010-1-2
13.Sep.2013 REV.001
http://www.Datasheet4U.com




BU9873 pdf, 반도체, 판매, 대치품
BU9873
Block Diagram
Datasheet
32KOUT 1
32KOUT
CONTROL
8 VDD
SCL 2
FILTER
SDA 3
VSS 4
FILTER
SDA
CONTROL
I/O
CONTROL
TIME COUNTER
SEC
MIN
HOUR
WEEK
DAY
MONTH
YEAR
ALARM_A
ALARM_B
COMP_A
COMP_B
OSC
DETECT
OSC
DIV
INTRB
CONTROL
7 OCSIN
6 OSCOUT
5 INTRB
Figure 4. Block diagram
Absolute Maximum Ratings
Item Symbol
Rating
Unit
Remark
Supply Voltage
VDD
0.3 to 6.5
0.45 (SOP8)
V
When using above Ta=25, decreased by 4.5mW/°C.
0.45 (SOP-J8)
When using above Ta=25, decreased by 4.5mW/°C.
Power Dissipation
Pd
0.33 (TSSOP-B8)
W When using above Ta=25, decreased by 3.3mW/°C.
0.31 (MSOP8)
When using above Ta=25, decreased by 3.1mW/°C.
Storage
Temperature
Operating
Temperature
0.30 (VSON008X2030)
Tstd 55 to +125
Topt 40 to +85
When using above Ta=25, decreased by 3.0mW/°C.
°C
°C
Terminal Voltage
-0.3 to VDD +0.3
The Max value of Terminal Voltage is not over 6.5V.
V When the pulse width is 50ns or less, the Min value of
Terminal Voltage is not lower than -0.8V.
Caution: Operating the IC over the absolute maximum ratings may damage the IC. In addition, it is impossible to predict all destructive situations such as
short-circuit modes, open circuit modes, etc. Therefore, it is important to consider circuit protection measures, like adding a fuse, in case the IC is operated in a
special mode exceeding the absolute maximum ratings
Recommended Operating Conditions
Item Symbol Rating
Unit
Supply Voltage
VDD
1.8 to 5.5
V
Timekeeping
Voltage(Note 1)
VCLK
1.45 to 5.5
V
Input Voltage
VIN
0 to VDD
V
(Note1) For minimum time keeping voltage, CGOUT = CDOUT = 0 pF; Quartz crystal unit: CL (load capacitor) = 6 pF to 12.5 pF, Maximum value of R1 (equivalent
series resistance) = 80 K.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
4/37
TSZ02201-0919AGZ00010-1-2
13.Sep.2013 REV.001
http://www.Datasheet4U.com

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BU9873 전자부품, 판매, 대치품
BU9873
Typical Performance Curves
0.8
0.6
0.4
0.2
0
0 12 3 45 6
Supply Voltage VDD [V]
Figure 7. Timekeeping Current vs. Supply Voltage
(with no 32-kHz clock output, output pins open)
(CGOUT=CDOUT=0pF, Topt=25°C)
Datasheet
1.2
1
0.8
0.6
0.4
0.2
0
-60 -30 0 30 60 90 120
Operation Te mperature Topt [Celsius]
Figure 8. Timekeeping Current vs. Operating Temperature
(with no 32-kHz clock output, output pins open)
(CGOUT=CDOUT=0pF, VDD=3V)
4 40
VDD=1.5V
VDD=3.0V
3 30 VDD=5.8V
2 20
1 10
0
01 2345 6
Supply Voltage VDD [V]
Figure 9. Timekeeping Current vs. Supply Voltage
(with 32-kHz clock output, output pins open)
(CGOUT=CDOUT=0pF, Topt=25°C)
0
0 100 200 300 400
SCL Clock Frequency [kHz]
Figure 10. CPU Access Current vs. SCL Clock Frequency
(with no 32-kHz clock output, SDA=“H”)
(other pins open, CGOUT=CDOUT=0pF, Topt=25°C)
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
7/37
TSZ02201-0919AGZ00010-1-2
13.Sep.2013 REV.001
http://www.Datasheet4U.com

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