Real time clock module
Epson Toyocom
Product Number (Please contact us)
RX-8801SA: X1B000011xxxx00
Built-in 32.768 kHz-DTCXO, High Stability
I2C-Bus INTERFACE REAL TIME CLOCK MODULE
RX-8801JE : X1B000031xxxx00
RX - 8801SA JE
/
•Built in frequency adjusted 32.768 kHz crystal unit and DTCXO.
•Interface Type
:
I2C-Bus Interface (400 kHz)
•Interface voltage range
: 1.6 V to 5.5 V
•Temp.compensated voltage range: 2.2 V to 5.5 V
•Wide Timekeeper voltage range : 1.6 V to 5.5 V
Actual size
•32.768 kHz frequency output function : C-MOS output With Control Pin
•The various functions include full calendar, alarm, timer.
* The I2C-Bus is a trademark of NXP Semiconductors
Block diagram
Overview
• High Stability
•UA
32.768 kHz
± 1.9 x 10-6
/
0 ºC to +40 ºC
( Equivalent to 5 seconds of month deviation )
± 3.4 x 10-6
( Equivalent to 9 seconds of month deviation )
•UB
± 3.8 x 10-6
( Equivalent to 10 seconds of month deviation )
/
-40 ºC to +85 ºC
32kHz
DTCXO
/
0 ºC to +50 ºC
± 5.0 x 10-6
/
-40 ºC to +85 ºC
CLOCK
DIVIDER
and
( Equivalent to 13 seconds of month deviation )
CALENDAR
FOUT
FOE
• 32.768 kHz frequency output function
• FOUT pin output (C-MOS output), CL=30 pF
• Output selectable
FOUT
TIMER
REGISTER
CONTROLLER
< 32.768 kHz, 1024 Hz, 1 Hz >
INTERRUPT
ALARM
REGISTER
/ INT
CONTROLLER
• The various interrupt
• Timer Function can be set up between
1/ 4096 second and 255 minutes.
• Alarm Function can be set to day of week,
day, hour, or minute.
CONTROL
REGISTER
and
SCL
SDA
INTERFACE
CIRCUIT
SYSTEM
CONTROLLER
*It is possible to use it by the terminal connection as
32.768 kHz-DTCXO.
Pin Function
Terminal connection /
External dimensions
(Unit:mm)
RX−8801JE
Signal
I / O
−
RX 8801 SA
Function
Name
1. / INT
2. GND
20. N.C.
1. T1(CE)
2. SCL
3. FOUT
4. N.C.
5. TEST
6. VDD
14. N.C.
13. SDA
12. T2(V
* Use by the manufacture for testing.
( Do not connect externally.)
Serial clock input pin
19. N.C.
18. N.C.
17. N.C.
16. N.C.
15. N.C.
14. N.C.
13. N.C.
12. N.C.
T1(CE)
SCL
input
input
3. T2(VPP
4. SDA
5. N.C.
)
The pin outputs the reference clock signal.
( CMOS output )
PP
)
FOUT
Output
11. GND
10.
* Use by the manufacture for testing.
( Do not connect externally.)
6. T1(CE)
7. SCL
TEST
input
5.0
5.4
/ INT
V
DD
-
Connected to a positive power supply
FOE
/ INT
GND
input
The input pin for the FOUT output control.
8. FOUT
9. N.C.
1.5Max.
9. N.C.
8. N.C.
Output Interrupt output ( N-ch open drain )
-
-
0.2
7.4
Connected to a ground
7. FOE
6.0 0.2
10. FOE
11.
VDD
* Use by the manufacture for testing.
( Do not connect externally.)
Data input and output pin
T2(VPP)
SDA
−
SOP 14 pin
VSOJ − 20 pin
Metal may be exposed on the top or bottom of this product.
This w ill not affect any quality, reliability or electrical spec.
I / O
Specifications (characteristics)
∗ Refer to application manual for details.
Electrical Characteristics
32.768 kHz-DTCXO Frequency temperature characteristics (Example)
Item
Symbol
Condition
Interface voltage
Min.
1.6
Typ.
Ma x.
Unit
V
Interface voltage
V
DD
3.0
5.5
Frequency temperature characteristics
Temp. compensated
VTEM
Temp. compensated voltage
2.2
3.0
5.5
V
10
Voltage
Clock voltage
V
CLK
-
-
1.6
−40
3.0
5.5
V
5
Operating temperature
TOPR
+25
+85
ºC
32.768 kHz DTCXO
0
-5
∗1
Ta = 0 ºC to +40 ºC
±1.9
±3.4
±3.8
±5.0
UA
∗2
∗3
∗4
Ta = -40 ºC to +85 ºC
−6
Stability
∆ f / f
× 10
Ta = 0 ºC to +50 ºC
UB
-10
Ta = -40 ºC to +85 ºC
-15
Tuning fork X'tal
Current consumption (1)
Current consumption (2)
Backup Mode
I
BK1
V
DD = 5V
-
-
1.2
0.8
3.4
2.8
-20
-25
-30
FOE = GND,
/INT = VDD
µA
IBK2
VDD = 3V
FOUT output : OFF
∗
∗
1 )
∗2 )
Equivalent to 5 seconds of month deviation.
∗4 )
Equivalent to 10 seconds of month deviation.
Equivalent to 9 seconds of month deviation.
-45 -35 -25 -15
-5
5
15
25
35
45
55
65
75
85
3 )
Equivalent to 13 seconds of month deviation.
Temperature (ºC)
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