RA-8581SA Datasheet, PDF (1/2 Pages) Epson ToYoCom – I2C-Bus INTERFACE REAL TIME CLOCK MODULE

Real time clock module
REAL TIME CLOCK MODULE (I²C-Bus)
For Automotive
RA - 8581SA
Built-in frequency adjusted 32.768kHz crystal unit.
Interface Type
: I²C-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A/3V(Typ.)
32.768 kHz frequency output function : C-MOS output With Control Pin
The various functions include full calendar, alarm, timer.
Applications : Car audio, Car navigation system, Clock, ECU sub clock
Conforms to AEC-Q200
Actual size
* The I²C-Bus is a trademark of NXP Semiconductors
Product Number (Please contact us)
RA-8581SA : Q41A88152xxxx00
Block diagramç
32.768 kHz
OSC
FOUT
FOE
/ INT
DIVIDER
FOUT
CONTROLLER
INTERRUPTS
CONTROLLER
SCL
SDA
I²C-BUS
INTERFACE
CIRCUIT
CLOCK
and
CALENDAR
TIMER
REGISTER
ALARM
REGISTER
CONTROL
REGISTER
and
SYSTEM
CONTROLLER
ç ç ç Overviewç
ç
 Interface Type
• I²C-Bus interface. (Hi-speed bus specifications 400kHz)
I²C-Bus slave address:read A3h and write A2h
32.768 kHz frequency output function
• FOUT pin output (C-MOS output ), CL=30 pF
• 32.768 kHz clock frequency output. (Duty 50 ±5%)
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).
Interrupt function
• Alarm interrupt function, Time update interrupt function.
Pin Functionç
ç ç Terminal connection/External dimensionsç (Unit:mm)
Signal Name
SCL
SDA
FOUT
FOE
/INT
VDD
GND
Input / Output
Input
Bi-directional
Function
Serial clock input pin
Data input and output pin
Output
Input
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
F O U T p in
ou tp ut
H IG H 
O u tp ut (C -M O S )
L O W
OFF
(L O W )
Output
-
-
Interrupt output (N-ch open drain)
Connected to a positive power supply.
Connected to a ground.
RA8581SA
1. N.C.
14. FOUT
2. SCL
13. N.C.
3. SDA
12. N.C.
4. N.C.
5. GND
11. VDD
5.0
10. FOE
6. N.C.
9. N.C.
7. /INT
7.40.2
8. N.C.
SOP14 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)
 Refer to application manual for details.
 Recommended Operating Conditions
Item
Symbol
Conditions
Min.
Power voltage
VDD
-
1.8
Clock voltage
VCLK
-
1.6
Operating
temperature
TOPR
-
-40
 Frequency characteristics
Item
Symbol
Conditions
Frequency
tolerance
f/f
Ta=+25C
VDD=3.0V
FOUT
output Duty
tw/t
Ta=-40C to+85C
VDD=2.4Vto5.5V
Equivalent to 1 minute of monthly deviation
Typ. Max. Unit
3.0 5.5
V
3.0 5.5
V
+25 +85
C
Rating
Unit
B: 523 ^{106}
505
%
 Current consumption characteristics
Ta=-40C to+85C
Item Symbol
Conditions
Min. Typ. Max. Unit
Current
Consumption
fSCL=0Hz
FOE=GND
IBK
FOUT;Output OFF
(LOW)
VDD
=5V -

VDD
=3V -

fSCL=0Hz
FOE=VDD
VDD
=5V -

I32k _FOUT;
VDD
32.768kHz Output ON _{=3V -}
CL=30pF

0.65 1.2
µA
0.45 0.8
8.0 20.0
µA
5.0 12.0