Real time clock module
Epson Toyocom
I2C-Bus INTERFACE REAL TIME CLOCK MODULE
RX - 8581 SA
/
JE NB
/
•
•
•
•
•
•
•
Built-in frequency adjusted 32.768 kHz crystal unit.
Interface Type
:
:
:
:
I2C-Bus Interface (400 kHz)
Operating voltage range
Wide Timekeeper voltage range
Low backup current
1.8 V to 5.5 V
1.6 V to 5.5 V
0.45
C-MOS output With Control Pin
The various functions include full calendar, alarm, timer.
µA / 3 V (Typ.)
32.768 kHz frequency output function
:
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 400 kHz )
I2C-Bus slave address : read A3h and write A2h
32.768 kHz
OSC
CLOCK
and
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 %)
CALENDAR
FOUT
FOUT
TIMER
• Timer function
CONTROLLER
REGISTER
FOE
• 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)
−
−
−
RX 8581 SA
RX 8581 JE
RX 8581 NB
1. / INT
2. GND
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.
1. N.C.
2. N.C.
3. FOE
4. VDD
5. FOUT
6. SCL
7. SDA
20. N.C.
19. N.C.
18. N.C.
17. N.C.
16. N.C.
15. N.C.
14. N.C.
13. N.C.
12. 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.
3.
( VDD
)
4. N.C.
5. SDA
6. SCL
5.0
4.8
7. FOUT
8. VDD
5.4
±
1.3 0.1
8.
9. GND
10.
( VDD
)
1.5 Max.
9. FOE
10. N.C.
11. N.C.
13.
12.
−
−
±
0.2
7.4
7.
8. N.C.
/ INT
±
5.0 0.2
0.2
±
6.0
11. N.C.
/ INT
SOP 14 pin
−
VSOJ 20 pin
−
SON − 22 pin
Metal may be exposed on the top or bottom of this product. This will not affect any quality, reliability or electrical spec.
Specifications (characteristics)
Refer to application manual for details.
!
!
Current consumption characteristics
Recommended Operating Conditions
Ta = -40 °C to +85 °C
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Item
Symbol
Condition
Min. Typ. Max. Unit
Power voltage
Clock voltage
Operating
DD
V
V
1.8
1.6
3.0
3.0
5.5
5.5
V
V
DD
V
CLK
SCL
f
= 0 Hz
0.65 1.2
µA
= 5 V
FOE = GND
OPR
°
C
T
-40
+25
+85
temperature
BK
I
FOUT ;
output OFF ( LOW )
DD
V
= 3 V
0.45 0.8
!
Frequency characteristics
Current
Consumption
Item
Symbol
Condition
Rating
Unit
SCL
f
= 0 Hz
DD
V
= 5 V
8.0 20.0
µA
a
°
= +25 C
= 3.0 V
T
V
Frequency
tolerance
DD
6
−
FOE = V
∆
×
f / f
10
±
5
23
DD
32k
I
FOUT ;
32.768 kHz output ON
CL = 30 pF
DD
V
= 3 V
a
°
°
T
V
= -40 C to +85 C
= 2.4 V to 5.5 V
5.0 12.0
FOUT output Duty
±
%
tw / t
50
5
DD
Please ask for tighter tolerance. ( Equivalent to 1 minute of monthly deviation )
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