Real time clock module
Product Number (Please contact us)
RX-8581SA : Q41858152xxxx00
RX-8581JE : Q41858171xxxx00
RX-8581NB : Q41858192000200
REAL TIME CLOCK MODULE (I
2
C-Bus)
RX - 8581SA
/
JE
/
NB
Built-in
frequency adjusted 32.768kHz crystal unit.
Interface
Type
:
I
2
C-Bus Interface(400kHz)
Operating
voltage range
:
1.8V to5.5V
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.
*
The I
2
C-Bus is a trademark of NXP Semiconductors
Actual size
RX-8581SA
RX-8581JE
RX-8581NB
Block diagram
32.768 kHz
CLOCK
and
CALENDAR
Overview
Interface Type
• I
2
C-Bus interface.
(Hi-speed
bus specifications 400kHz)
2
I
C-Bus slave address:read A3h and write A2h
DIVIDER
OSC
32.768
kHz frequency output function
• FOUT pin output (C-MOS output ), CL=30 pF
• 32.768 kHz clock frequency output. (Duty 50 ±5 %)
FOUT
FOE
FOUT
CONTROLLER
TIMER
REGISTER
Timer
function
• 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).
/ INT
INTERRUPTS
CONTROLLER
ALARM
REGISTER
Interrupt
function
SCL
SDA
I
2
C-BUS
INTERFACE
CIRCUIT
CONTROL
REGISTER
and
SYSTEM
CONTROLLER
• Alarm interrupt function, Time update interrupt function.
Terminal connection/External dimensions
RX8581SA
1.27
(Unit:mm)
RX8581JE
RX8581NB
20.
19.
7.0
0.3
2.
10.1
0.2
N.C.
FOE
V
DD
FOUT
SCL
SDA
(V
DD
)
GND
/INT
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
GND
(V
DD
)
N.C.
SDA
SCL
FOUT
V
DD
FOE
N.C.
N.C.
0.5
1.
2.
3.
4.
5.
6.
7.
N.C.
SCL
SDA
N.C.
14.
13.
12.
11.
5.0
FOUT
N.C.
N.C.
V
DD
FOE
N.C.
N.C.
0.65
1.
3.
4.
5.
6.
7.
8.
9.
10.
N.C.
N.C.
1.
/INT
6.3
Max.
22.
21.
20.
19.
18.
17.
4.8
1.3
0.1
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
18.
17.
16.
15.
GND
3.2
0.1
10.
9.
8.
5.4
14.
1.5
Max.
13.
16.
15.
14.
13.
12.
N.C.
/INT
7.4
0.2
12.
6.0
0.2
11.
5.0
0.2
SOP14
pin
VSOJ20
pin
SON22
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
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
I
BK
Item
Symbol
Conditions
Min.
V
DD
=5V
V
DD
=3V
V
DD
=5V
-
T
a
=-40Cto+85C
Symbol
V
DD
V
CLK
T
OPR
Conditions
-
-
-
Min.
1.8
1.6
-40
Typ.
0.65
Max.
1.2
Unit
f
SCL
=0Hz
FOE=GND
FOUT;
output OFF(LOW)
µA
-
0.45
0.8
Frequency characteristics
Item
Frequency
tolerance
FOUT output Duty
Symbol
f/f
tw/t
Conditions
T
a
=+25C
V
DD
=3.0V
T
a
=-40Cto+85C
V
DD
=2.4Vto5.5V
Rating
B:
523
505
Unit
10
%
6
Current
Consumption
f
SCL
=0Hz
FOE=V
DD
I
32k
-
8.0
20.0
µA
FOUT;
32.768kHz output ON V
DD
=3V
CL=30pF
-
5.0
12.0
Please
ask for tighter tolerance.( 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
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The information about applied circuitry, software, usage, etc. written in this material is intended for reference only. Seiko Epson does
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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.
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