Real time clock module
Epson Toyocom
Product Number (Please contact us)
RX-8025SA: Q41802551xxxx00
RX-8025NB : Q41802591xxxx00
High-Stability
I2C-Bus INTERFACE REAL TIME CLOCK MODULE
RX - 8025SA NB
/
•Built-in 32.768 kHz crystal unit
: Frequency adjusted for high accuracy
(± 5 ×10−6 / T
= +25 °C)
: I2C-Bus Interface (400 kHz)
a
•Interface Type
•Operating voltage range: 1.70 V to 5.5 V
•Wide Timekeeper voltage range
•Various detection Functions
•Low backup current
•32.768 kHz frequency output function : C-MOS output With Control Pin
•The various functions include full calendar, alarm, timer.
: 1.15 V to 5.5 V
: Ex. Oscillation stop detection function
: 0.48 µA / 3 V (Typ.)
Actual size
RX-8025SA
RX-8025NB
* The I2C-Bus is a trademark of NXP Semiconductors
Block diagram
Overview
• Features built-in 32.768 kHz crystal unit
• Frequency adjusted for high accuracy.
Alarm_W Register
( Min, Hour,W eek )
Comparator_W
Comparator_D
( ± 5 ×10−6
/ Ta = +25 °C )
FOUT
FOE
32 k Hz
Output
Control
V
DD
Voltage
Detect
( Equivalent to 13 seconds of monthly deviation )
Alarm_D Register
( Min,Hour )
• The various detection function
• Power supply voltage monitoring function
(with selectable detection threshold )
• Stop detection function
• Power-on reset detection function
Divider
Correc
-tion
Time Counter
( Sec,Min,Hour,Week,Day,Month,Year )
Div.
OSC
• Alarm function and Timer function
• Timer function produces a periodic interruption signal.
As for the Alarm function an optional combination is produced.
(Date of the week , time , minute)
Address
Decoder
Address
Register
SCL
OSC
Detect
I/O
Control
SDA
GND
/ INTA
/ INTB
Interrupt Control
Shift Register
Pin Function
Terminal connection / External dimensions
(Unit:mm)
Signal
Name
SCL
RX − 8025 SA
RX − 8025 NB
Input / output
Function
Input
Bi-directional
N.C.
22.
Serial clock input pin
Data input and output pin
32.768 kHz clock output pin with the output
control function. (C-MOS)
1. FOE
2.
1. N.C.
2. SCL
3. FOUT
4. N.C.
5. TEST
14. N.C.
13. SDA
12. / INTB
11. GND
10. / INTA
9. N.C.
SDA
N.C.
V
DD
21.
3. (GND)
4. TEST
5. FOUT
6. SCL
20. N.C.
FOUT
FOE
Output
Input
FOE
input
L
/CLEN1 /CLEN2
FOUT
output
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
−
19.
18.
17.
16.
15.
14.
13.
12.
bit
X
0
0
1
bit
X
0
1
0
OFF ( LOW )
32.768 kHz
32.768 kHz
32.768 kHz
OFF(LOW)
5.0
H
4.8
7. SDA
8. / INTB
9. GND
1
1
1.3
±
0.1
/ INTA
/ INTB
Output
Output
6.
VDD
Interrupt output A pin ( N-ch open drain )
Interrupt output B pin ( N-ch open drain )
±
7.4 0.2
10.
/ INTA
7. FOE
8. N.C.
5.0 ±
0.2
Used by the manufacture for testing.
(Do not connect externally.)
−
TEST
11. N.C.
−
SOP 14 pin
−
SON 22 pin
V
DD
Connected to a positive power supply.
Connected to a ground.
GND
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.
.
!
!
Current consumption characteristics
Recommended Operating Conditions
−
40
°
°
to +85 C
Ta
=
C
Item
Symbol
Condition
SCL
= 0Hz
FOE = GND
FOUT; output
OFF(LOW)
Min. Typ. Max. Unit
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
DD
V
Power voltage
Clock voltage
Operating
VDD
1.7
1.15
3.0
3.0
5.5
5.5
V
V
f
0.60 1.80
µA
0.48 1.20
CLK
= 5 V
V
I
BK
VDD
OPR
−
40
°
C
T
+25
+85
temperature
= 3 V
Curent
Consumption
f
SCL
= 0Hz
!
Frequency characteristics
DD
V
= 5.5 V
DD
V
, FOE = 5.5 V
I
32k
3.0
6.5
µA
FOUT; output ON
( Output=OPEN;
CL = 0 pF )
Item
Symbol
Condition
Range
Unit
1)
2)
a
°
±
±
Frequency
tolerance
Oscillation
start-up time
Frequency voltage
characteristics
T
V
T
V
T
V
= +25 C
AA: 5
AC: 0
5
5
6
6
−
∆
×
f / f
10
s
DD
= 3.0 V
°
a
= +25 C
!
t
STA
Power supply detection voltage
−
30
°
°
C
1 Max.
Ta
=
C
to +70
DD = 2.0 V
°
a = +25 C
Item
Symbol
Condition
Min. Typ. Max. Unit
−
±
×
10
f / V
1 Max.
DD
= 2.0 V to 5.5 V
DETH
DD
High-voltage mode
Low-voltage mode
V
V
pin
1.90 2.10 2.30
1.15 1.30 1.45
V
V
1) 2) Equivalent to 13 seconds of monthly deviation (excluding offset).
V
DETL
V
DD pin
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