Real time clock module
Product Number (Please contact us)
RX-8581SA : Q41858152xxxx00
RX-8581JE : Q41858171xxxx00
RX-8581NB : Q41858192000200
REAL TIME CLOCK MODULE (I2C-Bus)
RX - 8581SA/JE/NB
Built-in frequency adjusted 32.768kHz crystal unit.
Interface Type
: I2C-Bus Interface(400kHz)
Operating voltage range
Wide Timekeeper voltage range
Low backup current
: 1.8V to5.5V
: 1.6Vto5.5V
: 0.45A/3V(Typ.)
32.768 kHz frequency output function : C-MOS output With Control Pin
The various functions include full calendar, alarm, timer.
Actual size
RX-8581SA
RX-8581JE
RX-8581NB
* The I2C-Bus is a trademark of NXP Semiconductors
Block diagram
Overview
Interface Type
• I2C-Bus interface. (Hi-speed bus specifications 400kHz)
I2C-Bus slave address:read A3h and write A2h
32.768 kHz
CLOCK
and
CALENDAR
DIVIDER
32.768 kHz frequency output function
• FOUT pin output (C-MOS output ), CL=30 pF
• 32.768 kHz clock frequency output. (Duty 50 ±5 %)
OSC
FOUT
FOE
FOUT
TIMER
Timer function
CONTROLLER
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).
INTERRUPTS
CONTROLLER
ALARM
REGISTER
/ INT
Interrupt function
CONTROL
REGISTER
• Alarm interrupt function, Time update interrupt function.
I2C-BUS
SCL
SDA
INTERFACE
CIRCUIT
and
SYSTEM
CONTROLLER
Terminal connection/External dimensions
(Unit:mm)
RX8581SA
RX8581JE
RX8581NB
1.
2. GND
3.
22. N.C.
21. N.C.
20. N.C.
19. N.C.
18. N.C.
17. N.C.
16. N.C.
15. N.C.
14. N.C.
/INT
1. N.C.
20. N.C.
1. N.C.
2. SCL
3. SDA
4. N.C.
5. GND
6. N.C.
14. FOUT
13. N.C.
12. N.C.
11. VDD
10. FOE
9. N.C.
2. N.C.
3. FOE
4. VDD
5. FOUT
6. SCL
7. SDA
19. N.C.
18. N.C.
17. N.C.
16. N.C.
15. N.C.
14. N.C.
(VDD)
4. N.C.
5. SDA
6. SCL
7. FOUT
8. VDD
5.0
4.8
5.4
1.30.1
8.
9. GND
10.
Max. 13. N.C.
(VDD)
1.5
9. FOE
10. N.C.
11. N.C.
12. N.C.
13.
12.
7.40.2
7.
8. N.C.
/INT
5.00.2
6.00.2
11. N.C.
/INT
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)
Refer to application manual for details.
Recommended Operating Conditions
Current consumption characteristics
Ta=-40Cto+85C
Item
Symbol
Conditions
Min.
Typ.
Max.
Unit
Item
Symbol
Conditions
Min. Typ. Max. Unit
Power voltage
Clock voltage
Operating
VDD
VCLK
1.8
1.6
3.0
3.0
5.5
5.5
V
V
VDD
=5V
fSCL=0Hz
-
-
-
-
0.65 1.2
0.45 0.8
8.0 20.0
5.0 12.0
FOE=GND
TOPR
-40
+25
+85
C
temperature
IBK
µA
µA
FOUT;
output OFF(LOW)
VDD
=3V
Frequency characteristics
Current
Consumption
Item
Symbol
Conditions
Rating
Unit
fSCL=0Hz
FOE=VDD
VDD
=5V
Frequency
tolerance
Ta=+25C
VDD=3.0V
6
f/f
10
B: 523
505
I32k
FOUT;
32.768kHz output ON
CL=30pF
VDD
=3V
Ta=-40Cto+85C
VDD=2.4Vto5.5V
FOUT output Duty
tw/t
%
Please ask for tighter tolerance.( Equivalent to 1 minute of monthly deviation )