Real time clock module
REAL TIME CLOCK MODULE (I
2
C-Bus)
For Automotive
Product Number (Please contact us)
RA-8581SA : Q41A88152xxxx00
RA - 8581
SA
Built-in
frequency adjusted 32.768kHz crystal unit.
Interface
Type
:
I
2
C-Bus Interface(400kHz)
Operating
voltage range
:
1.8Vto5.5V
Wide
Timekeeper voltage range
:
1.6Vto5.5V
Low
backup current
:
0.45A/3V(Typ.)
32.768
kHz frequency output function
:
C-MOS output With Control Pin
The
various functions include full calendar, alarm, timer.
Conforms
to AEC-Q200
Applications
:
Car audio, Car navigation system, Clock, ECU sub clock
Actual size
*
The I
2
C-Bus is a trademark of NXP Semiconductors
Block diagram
32.768 kHz
CLOCK
and
CALENDAR
Overview
Interface Type
DIVIDER
OSC
• I
2
C-Bus interface.
(Hi-speed
bus specifications 400kHz)
I
2
C-Bus slave address:read A3h and write A2h
32.768
kHz frequency output function
FOUT
FOE
FOUT
CONTROLLER
TIMER
REGISTER
• FOUT pin output (C-MOS output ), CL=30 pF
• 32.768 kHz clock frequency output. (Duty 50 ±5%)
Timer
function
/ INT
INTERRUPTS
CONTROLLER
ALARM
REGISTER
• Timer interrupt function can be set up between
1/4096 second and 4095 minutes.
• It is recorded automatic to TF-bit at the time of event
occurrence,and possible to output with /TIRQ pin output
(N-ch open-drain output).
SCL
SDA
I
2
C-BUS
INTERFACE
CIRCUIT
CONTROL
REGISTER
and
SYSTEM
CONTROLLER
Interrupt
function
• Alarm interrupt function, Time update interrupt function.
Pin Function
Signal Name
SCL
SDA
Input / Output
Input
Bi-directional
Serial clock input pin
Data input and output pin
FOUT pin outputs the reference clock signal at 32.768 kHz.
FOE pin inputs the FOUT output control.
F O E p in
in p u t
H
IG H
F O U T p in
o u tp u t
O u tp u t
O FF
( C
- M O S
)
( L
O W
)
Terminal connection/External dimensions
(Unit:mm)
Function
1.
2.
3.
4.
5.
6.
7.
N.C.
SCL
SDA
N.C.
5.0
RA8581SA
1.27
14.
10.1
0.2
FOUT
N.C.
N.C.
V
DD
FOE
N.C.
N.C.
13.
12.
11.
10.
FOUT
Output
GND
N.C.
/INT
7.4
0.2
3.2
0.1
FOE
Input
L
O W
9.
8.
/INT
V
DD
GND
Output
-
-
Interrupt output (N-ch open drain)
Connected to a positive power supply.
Connected to a ground.
SOP14
pin
The metal case inside of the molding compound may be exposed on the top or
bottom of this product. This purely cosmetic and does not have any effect on
quality, reliability or electrical specs.
Specifications (characteristics)
Recommended Operating Conditions
Item
Power voltage
Clock voltage
Operating
temperature
Symbol
V
DD
V
CLK
T
OPR
Conditions
-
-
-
Refer to application manual for details.
Current consumption characteristics
Typ.
3.0
3.0
+25
Max.
5.5
5.5
+85
Unit
V
V
C
Current
Consumption
T
a
=-40C
to+85C
Min.
1.8
1.6
-40
Item
Symbol
Conditions
Min.
V
DD
=5V
V
DD
=3V
V
DD
=5V
-
Typ.
0.65
Max.
1.2
Unit
f
SCL
=0Hz
I
BK
FOE=GND
FOUT;Output OFF
(LOW)
µA
-
0.45
0.8
Frequency characteristics
Item
Frequency
tolerance
FOUT
output Duty
Symbol
f/f
Conditions
Ta=+25C
V
DD
=3.0V
Ta=-40C to+85C
V
DD
=2.4Vto5.5V
Rating
B:
523
505
Unit
10
6
f
SCL
=0Hz
FOE=V
DD
I
32k
-
8.0
20.0
µA
tw/t
%
FOUT;
V
DD
32.768kHz Output ON
=3V
CL=30pF
-
5.0
12.0
Equivalent
to 1 minute of monthly deviation
PROMOTION OF ENVIRONMENTAL MANAGEMENT SYSTEM
CONFORMING TO INTERNATIONAL STANDARDS
At Seiko Epson, all environmental initiatives operate under the
Plan-Do-Check-Action (PDCA) cycle designed to achieve continuous
improvements. The environmental management system (EMS)
operates under the ISO 14001 environmental management standard.
All of our major manufacturing and non-manufacturing sites, in
Japan and overseas, completed the acquisition of ISO 14001
certification.
ISO 14000 is an international standard for environmental
management that was established by the International
Standards Organization in 1996 against the background of
growing concern regarding global warming, destruction of
the ozone layer, and global deforestation.
WORKING FOR HIGH QUALITY
In order provide high quality and reliable products and services
than meet customer needs,
Seiko Epson made early efforts towards obtaining ISO9000 series
certification and has acquired ISO9001 for all business
establishments in Japan and abroad. We have also acquired ISO/TS
16949 certification that is requested strongly by major automotive
manufacturers as standard.
►Explanation
of the mark that are using it for the catalog
►Pb
free.
►Complies
with EU RoHS directive.
*About the products without the Pb-free mark.
Contains Pb in products exempted by EU RoHS directive.
(Contains Pb in sealing glass, high melting temperature type solder or other.)
►Designed
for automotive applications such as Car Multimedia, Body Electronics, Remote Keyless Entry etc.
►Designed
for automotive applications related to driving safety (Engine Control Unit, Air Bag, ESC etc ).
ISO/TS16949 is the international standard that added the
sector-specific supplemental requirements for automotive
industry based on ISO9001.
Notice
This material is subject to change without notice.
Any part of this material may not be reproduced or duplicated in any form or any means without the written permission of Seiko Epson.
The information about applied circuitry, software, usage, etc. written in this material is intended for reference only. Seiko Epson does
not assume any liability for the occurrence of infringing on any patent or copyright of a third party. This material does not authorize the
licensing for any patent or intellectual copyrights.
When exporting the products or technology described in this material, you should comply with the applicable export control laws and
regulations and follow the procedures required by such laws and regulations.
You are requested not to use the products (and any technical information furnished, if any) for the development and/or manufacture of
weapon of mass destruction or for other military purposes. You are also requested that you would not make the products available to
any third party who may use the products for such prohibited purposes.
These products are intended for general use in electronic equipment. When using them in specific applications that require extremely
high reliability, such as the applications stated below, you must obtain permission from Seiko Epson in advance.
/ Space equipment (artificial satellites, rockets, etc.) / Transportation vehicles and related (automobiles, aircraft, trains,
vessels, etc.) / Medical instruments to sustain life / Submarine transmitters / Power stations and related / Fire work equipment
and security equipment / traffic control equipment / and others requiring equivalent reliability.
All brands or product names mentioned herein are trademarks and/or registered trademarks of their respective.
Seiko Epson Corporation
京公网安备 11010802033920号
EEWORLD
