Real time clock module
Epson Toyocom
Product Number (Please contact us)
RA-8581SA : Q41A88151xxxx00
For Automotive
I
2
C-Bus INTER FACE REAL TIME C LOCK MOD ULE
RA - 8581 SA
•
Built-in frequency adjusted 32.768 kHz crystal unit.
•
Interface Type
:
I
2
C-Bus Interface (400 kHz)
•
Operating voltage range
:
1.8 V to 5.5 V
•
Wide Timekeeper voltage range
:
1.6 V to 5.5 V
•
Low backup current
:
0.45
µ
A / 3 V (Typ.)
•
32.768 kHz frequency output function
:
C-MOS output With Control Pin
Actual size
•
The various functions include full calendar, alarm, timer.
•
Conforms to AEC-Q200
*
The I
2
C-Bus is a trademark of NXP Semiconductors
Block diagram
32.768 kHz
CLOCK
and
CALENDAR
Overview
•
Interface Type
DIVIDER
• I C-Bus interface. ( Hi-speed bus specifications 400 kHz )
∗
I
2
C-Bus slave address : read A3h and write A2h
2
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
/ 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 utp ut
O utpu t
OF F
( C -M O S )
( LO W )
Terminal connection / External dimensions
Function
1.
2.
3.
4.
5.
6.
7.
N.C.
SCL
SDA
N.C.
GND
N.C.
/ INT
7.4
±
0 .2
3.2
±
0.1
5.0
(Unit:mm)
RA
−
8581 SA
1.27
14.
10.1
±
0.2
FOUT
N.C.
N.C.
V
DD
FOE
N.C.
N.C.
13.
12.
11.
10.
9.
8.
FOUT
Output
FOE
Input
LO W
/INT
V
DD
GND
Output
-
-
Interrupt output ( N-ch open drain )
Connected to a positive power supply.
Connected to a ground.
SOP
−
14 pin
Metal may be exposed on the top or bottom of this product.
This w ill not affect any quality, reliability or electrical spec.
Specifications (characteristics)
!
Recommended Operating Conditions
Item
Power voltage
Clock voltage
Operating
temperature
Symbol
V
DD
V
CLK
T
OPR
Condition
-
-
-
Min.
1.8
1.6
-40
Typ.
3.0
3.0
+25
Max.
5.5
5.5
+85
Unit
V
V
°
C
∗
Refer to application manual for details.
!
Current consumption characteristics
Item
Symbol
Condition
Min.
V
DD
=5V
V
DD
=3V
V
DD
=5V
T
a
= -40
°
C to +85
°
C
Typ.
0.65
Max.
1.2
Unit
f
SCL
= 0 Hz
I
BK
Current
Consumption
6
FOE = GND
FOUT ;Output OFF
( LOW )
0.45
0.8
µA
!
Frequency characteristics
Item
Frequency
tolerance
FOUT output Duty
Symbol
∆
f/f
tw / t
Condition
T
a
= +25
°
C
V
DD
= 3.0 V
T
a
= -40
°
C to +85
°
C
V
DD
= 2.4 V to 5.5 V
Rating
5
±
23
∗
50
±
5
Unit
×
10
−
%
f
SCL
= 0 Hz
FOE = V
DD
I
32k
8.0
20.0
µA
FOUT ;
V
DD
32.768 kHz Output ON = 3 V
CL = 30 pF
5.0
12.0
∗
Equivalent to 1 minute of monthly deviation
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EPSONTOYOCOM [ EPSON TOYOCOM ]
