BU9873 Datasheet PDF - ROHM Semiconductor
| Part Number | BU9873 | |
| Description | I2C BUS Serial Interface RTC | |
| Manufacturers | ROHM Semiconductor | |
| Logo |  |
|
|
There is a preview and BU9873 download ( pdf file ) link at the bottom of this page. Total 40 Pages | ||
Preview 1 page No Preview Available !
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 (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
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
1/37
TSZ02201-0919AGZ00010-1-2
13.Sep.2013 REV.001
http://www.Datasheet4U.com
|
| |
 
BU9873
Datasheet
DC Characteristics
Item
“H” Input Voltage
Symbol
VIH
Pin Name
SCL, SDA
Spec
Unit
Min Typ Max
0.7VDD － VDD+0.3 V
Conditions
“L” Input Voltage
VIL
SCL, SDA
-0.3 － 0.3VDD V
“H” Output Current
IOH 32KOUT － － -0.5 mA VOH=VDD-0.5V
“L” Output Current
IOL1 INTRB, 32KOUT
IOL2 SDA
1
6
－ － mA
－ － mA
VOL1=0.4V
VOL2=0.4V
Input Leakage Current
IILK
SCL
-1 － 1 μA VIN=5.5V or VSS, VDD=5.5V
Output Off State Leakage
Current
IOZ
IDD1
SDA, INTRB,
32KOUT
VDD
-1 － 1 μA
－ 0.4 0.6 μA
Standby Current
(time keeping current)
IDD2
VDD
－ － 1.0 μA
IDD3 VDD － － 1.35 μA
Internal Oscillation
Capacitance 1
CG OSCIN － 10 －
Internal Oscillation
Capacitance 2
CD OSCOUT － 10 －
Unless otherwise specified: Vss=0V, VDD=3V, Topt=−40°C to +85°C, Oscillation frequency=32.768 kHz
(load capacitance CL=6pF, equivalent series resistance R1=20kΩ)
pF
pF
VOUT=5.5V or VSS,
VDD=5.5V
VDD=3V,
Topt=25°C,
SCL, SDA=3V,
CGOUT=CDOUT=0pF,
Output=Open(Note1)
VDD=3V,
Topt=-40°C to +85°C,
SCL, SDA=3V,
CGOUT=CDOUT=0pF,
Output=Open(Note1)
VDD=5.5V,
Topt=-40°C to +85°C,
SCL, SDA=5.5V,
CGOUT=CDOUT=0pF,
Output=Open(Note1)
(Note 1) In this mode, 32KOUT is disabled and no clock is output from this pin.
For time keeping current when outputting 32-kHz pulse from 32KOUT pin (this pin without loading), please refer to “P.7 Typical Performance Curves”.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/37
TSZ02201-0919AGZ00010-1-2
13.Sep.2013 REV.001
http://www.Datasheet4U.com
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for BU9873 electronic component. |
| Information | Total 40 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ BU9873.PDF Datasheet ] | |
Share Link :
Electronic Components Distributor
|
An electronic components distributor is a company that sources, stocks, and sells electronic components to manufacturers, engineers, and hobbyists. |
| SparkFun Electronics | Allied Electronics | DigiKey Electronics | Arrow Electronics |
| Mouser Electronics | Adafruit | Newark | Chip One Stop |
Featured Datasheets
| Part Number | Description | MFRS |
| BU9873 | The function is I2C BUS Serial Interface RTC. ROHM Semiconductor | |
| BU9877FV | The function is Serial interface IC for DIMMs supporting plug & play. ROHM Semiconductor | |
Semiconductors commonly used in industry:
1N4148 |
BAW56 |
1N5400 |
NE555 | | ||
Quick jump to:
BU98
1N4
2N2
2SA
2SC
74H
BC
HCF
IRF
KA | ||