Toyocom
Epson Toyocom
Real time clock module
Product Number (Please contact us)
RX-8801SA : X1B000011xxxx00
RX-8801JE : X1B000031xxxx00
Built-in 32.768 kHz-DTCXO, High Stability
I2C-Bus INTERFACE REAL TIME CLOCK MODULE
RX - 8801 SA / 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
•32.768 kHz frequency output function : C-MOS output With Control Pin Actual size
•The various functions include full calendar, alarm, timer.
* The I2C-Bus is a trademark of NXP Semiconductors
Block diagram
Overview
• High Stability
•UA
-6
/
± 1.9 x 10
( Equivalent to
-6
/
± 3.4 x 10
( Equivalent to
•UB
-6
/
± 3.8 x 10
( Equivalent to
-6
/
± 5.0 x 10
( Equivalent to
32.768 kHz
32kHz
DTCXO
CLOCK
and
CALENDAR
DIVIDER
FOUT
FOE
FOUT
CONTROLLER
INTERRUPT
CONTROLLER
ALARM
REGISTER
• 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
SCL
INTERFACE
CIRCUIT
SDA
0 ºC to +50 ºC
10 seconds of month deviation )
-40 ºC to +85 ºC
13 seconds of month deviation )
• 32.768 kHz frequency output function
• FOUT pin output (C-MOS output), CL=30 pF
• Output selectable
< 32.768 kHz, 1024 Hz, 1 Hz >
TIMER
REGISTER
/ INT
0 ºC to +40 ºC
5 seconds of month deviation )
-40 ºC to +85 ºC
9 seconds of month deviation )
and
SYSTEM
CONTROLLER
*It is possible to use it by the terminal connection as
32.768 kHz-DTCXO.
Pin Function
input
FOUT
Output
TEST
input
VDD
FOE
/ INT
GND
input
Output
-
T2(VPP)
-
SDA
I/ O
T1(CE)
2.
SCL
3.
FOUT
4.
N.C.
5.
14.
TEST
6.
7.
9.
8.
7.4 ± 0.2
Ma x.
5.5
Unit
V
Current consumption (1)
VTEM
Temp. compensated voltage
2.2
3.0
5.5
V
VCLK
TOPR
-
1.6
−40
3.0
+25
±1.9 ∗1
5.5
+85
V
ºC
Current consumption (2)
IBK1
IBK2
Ta = 0 ºC to +40 ºC
Ta = 0 ºC to +50 ºC
±3.4 ∗2
±3.8 ∗3
Ta = -40 ºC to +85 ºC
±5.0 ∗4
Ta = -40 ºC to +85 ºC
Backup Mode
VDD = 5 V
FOE = GND,
/INT = VDD
VDD = 3 V
FOUT output : OFF
∗1 )
Equivalent to 5 seconds of month deviation.
∗3 )
Equivalent to 10 seconds of month deviation.
∗2 )
18.
N.C .
17.
N.C .
14.
N.C .
FOUT
N.C.
FOE
N.C .
N.C .
11.
6.0 ± 0. 2
13.
12.
1.5 Ma x.
VDD
32.768 kHz-DTCXO Frequency temperature characteristics (Example)
× 10 −6
-
1.2
3.4
-
0.8
2.8
Equivalent to 9 seconds of month deviation.
∗4 )
Equivalent to 13 seconds of month deviation.
µA
Frequency temperature characteristics
10
5
Frequency tolerance ( ×10 -6 )
Typ.
3.0
UB
N.C .
∗ Refer to application manual for details.
Min.
1.6
∆f/f
SC L
5.4
N.C .
19.
Metal may be exposed on the top or bottom of this product.
This w ill not affect any quality, reliability or electrical spec.
Condition
Interface voltage
UA
Stability
20.
VSOJ − 20 pin
Specifications (characteristics)
Symbol
VDD
N.C .
SOP − 14 pin
Electrical Characteristics
Item
Interface voltage
Temp. compensated
Voltage
Clock voltage
Operating temperature
15.
10.
N.C.
N.C .
T1( CE)
7.
N.C.
16.
6.
/ INT
N.C.
9.
10.
SD A
5.
GND
T2( VPP)
4.
T2(VPP )
11.
VDD
3.
SDA
12.
GND
8.
13.
5.0
FOE
2.
N.C.
7.0 ± 0. 3
SCL
1.
* Use by the manufacture for testing.
( Do not connect externally.)
Serial clock input pin
The pin outputs the reference clock signal.
( CMOS output )
* Use by the manufacture for testing.
( Do not connect externally.)
Connected to a positive power supply
The input pin for the FOUT output control.
Interrupt output ( N-ch open drain )
Connected to a ground
* Use by the manufacture for testing.
( Do not connect externally.)
Data input and output pin
/ IN T
0.65
input
1.
3.2 ± 0.1
T1(CE)
(Unit:mm)
RX−8801JE
RX − 8801 SA
Function
10.1 ± 0.2
I/ O
1.27
Signal
Name
Terminal connection / External dimensions
32.768 kHz DTCXO
0
-5
-10
-15
Tuning fork X'tal
-20
-25
-30
http://www.epsontoyocom.co.jp
-45
-35
-25
-15
-5
5
15
25
Temperature (ºC)
35
45
55
65
75
85
