Real time clock module
Epson Toyocom
Product Number (Please contact us)
RX-8025SA : Q41802551xxxx00
RX-8025NB : Q41802591xxxx00
High-Stability
I
2
C-Bus INTER FACE REAL TIME C LOCK MODU LE
RX - 8025 SA
/
NB
•Built-in
32.768 kHz crystal unit
:
Frequency adjusted for high accuracy
(± 5
×10
−
6
/ T
a
= +25
°C)
•Interface
Type
:
I
2
C-Bus Interface (400 kHz)
•Operating
voltage range
:
1.70 V to 5.5 V
•Wide
Timekeeper voltage range
:
1.15 V to 5.5 V
•Various
detection Functions
:
Ex. Oscillation stop detection function
•Low
backup current
:
0.48
µA
/ 3 V (Typ.)
•32.768
kHz frequency output function
:
C-MOS output With Control Pin
•The
various functions include full calendar, alarm, timer.
*
The I C-Bus is a trademark of
NXP Semiconductors
2
Actual size
RX-8025SA
RX-8025NB
Block diagram
Overview
•
Features built-in 32.768 kHz crystal unit
• Frequency adjusted for high accuracy.
(
±
5
×10
−6
/ T
a
= +25
°C
)
( Equivalent to 13 seconds of monthly deviation )
FOUT
FOE
32 kHz
Output
Control
Comparator_W
Alarm_W Register
( Min,Hour,W eek )
Voltage
Detect
V
DD
Comparator_D
Alarm_D Regi ster
( Min,Hour )
•
The various detection function
OSC
Divider
Correc
-tion
Div.
Time Counter
( Sec,Min,Hour,Week,Day,Month,Year )
• Power supply voltage monitoring function
(with selectable detection threshold )
• Stop detection function
• Power-on reset detection function
OSC
Detect
Address
Decoder
Address
Register
I/O
Control
•
Alarm function and Timer function
SCL
• Timer function produces a periodic interruption signal.
As for the Alarm function an optional combination is produced.
(Date of the week , time , minute)
SDA
/ INTA
Interrupt Control
/ INTB
Shift Register
GND
Pin Function
Signal
Name
SCL
SDA
FOUT
Input / output
Function
1.
2.
3.
4.
5.
6.
7.
Terminal connection / External dimensions
RX
−
8025 SA
N.C.
SCL
FOUT
N.C.
5.0
1.27
(Unit:mm)
RX
−
8025 NB
0.5
Input
Serial clock input pin
Bi-directional
Data input and output pin
Output
32.768 kHz clock output pin with the output
control function. (C-MOS)
FOE
input
L
H
/CLEN1
bit
X
0
0
1
1
/CLEN2
bit
X
0
1
0
1
FOUT
output
OFF ( LOW )
32.768 kHz
32.768 kHz
32.768 kHz
OFF(LOW )
14.
10.1
±
0.2
N.C.
SDA
/ INTB
GND
/ INTA
N.C.
N.C.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
FOE
V
DD
(GND)
TEST
FOUT
SCL
SDA
/ INTB
GND
/ INTA
N.C.
SON
−
22 pin
5.0
±
0. 2
4.8
1.3
±
0.1
6.3
Max.
22.
21.
20.
19.
18.
17.
16.
15.
14.
13.
12.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
−
−
13.
12.
11.
10.
FOE
/ INTA
/ INTB
TEST
V
DD
GND
Input
Output
Output
-
-
-
TEST
V
DD
FOE
7.4
±
0 .2
3.2
±
0.1
Interrupt output A pin ( N-ch open drain )
Interrupt output B pin ( N-ch open drain )
∗
Used by the manufacture for testing.
(Do not connect externally.)
Connected to a positive power supply.
Connected to a ground.
9.
8.
SOP
−
14 pin
Metal may be exposed on the top or bottom of this product. This w ill not affect any quality, reliability or electrical spec.
Specifications (characteristics)
.
∗
Refer to application manual for details.
!
Recommended Operating Conditions
Item
Power voltage
Clock voltage
Operating
temperature
Symbol
V
DD
V
CLK
T
OPR
Condition
-
-
-
Min.
1.7
1.15
−
40
Typ.
3.0
3.0
+25
Max.
5.5
5.5
+85
Unit
V
V
°
C
!
Current consumption characteristics
Item
Symbol
Condition
Min.
V
DD
=5V
V
DD
=3V
V
DD
= 5.5 V
T
a
=
−
40
°
C to +85
°
C
Typ.
0.60
0.48
Max.
1.80
Unit
I
BK
Curent
Consumption
!
Frequency characteristics
Item
Frequency
tolerance
Oscillation
start-up time
Frequency voltage
characteristics
Symbol
∆
f/f
Condition
T
a
= +25
°
C
V
DD
= 3.0 V
T
a
= +25
°
C
V
DD
= 2.0 V
T
a
= +25
°
C
V
DD
= 2.0 V to 5.5 V
Range
AA: 5
±
5
AC: 0
±
5
1 Max.
±
1 Max.
∗1)
∗
2)
Unit
×
10
−
6
s
×
10
−
6
I
32k
f
SCL
= 0Hz
FOE = GND
FOUT ; output
OFF(LOW)
f
SCL
= 0Hz
V
DD
, FOE = 5.5 V
FOUT ; output ON
( Output=OPEN;
CL = 0 pF )
µA
1.20
3.0
6.5
µA
t
STA
f/V
!
Power supply detection voltage
Item
High-voltage mode
Low-voltage mode
Symbol
V
DETH
V
DETL
Condition
V
DD
pin
V
DD
pin
Min.
1.90
1.15
T
a
=
−
30
°
C to +70
°
C
Typ.
2.10
1.30
Max.
2.30
1.45
Unit
V
V
∗
1)
∗
2) Equivalent to 13 seconds of monthly deviation (excluding offset).
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