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
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Seiko Epson made early efforts towards obtaining ISO9000 series
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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.
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