Real time clock module
Product Number (Please contact us)
RX-8025SA : Q41802552xxxx00
RX-8025NB : Q41802592xxxx00
High-Stability
I2C-Bus INTERFACE REAL TIME CLOCK MODULE
RX - 8025SA/NB
Built-in 32.768 kHz crystal unit
: Frequency adjusted for high accuracy
(5106/Ta=+25C)
Interface Type
: I2C-Bus Interface(400kHz)
Operating voltage range: 1.70Vto5.5V
Wide Timekeeper voltage range
Various detection Functions
Low backup current
: 1.15Vto5.5V
: Ex. Oscillation stop detection function
: 0.48A/3V(Typ.)
Actual size
RX-8025SA
32.768 kHz frequency output function : C-MOS output With Control Pin
The various functions include full calendar, alarm, timer.
RX-8025NB
* The I2C-Bus is a trademark of NXP Semiconductors
Block diagram
Overview
Features built-in 32.768kHz crystal unit
• Frequency adjusted forhigh accuracy.
(5106 / Ta=+25C)
Alarm_W Register
( Min,Hour,Week )
Comparator_W
Comparator_D
FOUT
FOE
32 kHz
Output
Control
VDD
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
Divider
Correc
-tion
Time Counter
( Sec,Min,Hour,Week,Day,Month,Year )
Div.
OSC
• Power-on reset detection function
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
RX8025SA
RX8025NB
Input / output
Function
N.C.
22.
Input
Bi-directional
Serial clock input pin
Data input and output pin
32.768kHzclock output pin with the output
control function. (C-MOS)
1. FOE
2. VDD
1. N.C.
2. SCL
3. FOUT
4. N.C.
5. TEST
14. N.C.
13. SDA
SDA
N.C.
21.
3. (GND)
4. TEST
5. FOUT
6. SCL
7. SDA
20. N.C.
N.C.
19.
FOUT
FOE
Output
Input
FOE
input
L
/CLEN1 /CLEN2
FOUT
output
12.
11. GND
10.
9. N.C.
8. N.C.
/INTB
bit
X
0
0
1
bit
X
0
1
0
N.C.
N.C.
N.C.
N.C.
N.C.
18.
17.
16.
15.
14.
13.
12.
OFF (LOW)
32.768 kHz
32.768 kHz
32.768 kHz
OFF(LOW)
5.0
H
4.8
/INTA
1
1
8.
9. GND
10.
11. N.C.
/INTB
1.30.1
/ INTA
/ INTB
Output
Output
6.
V
DD
Interrupt output A pin (N-ch open drain)
Interrupt output B pin (N-ch open drain)
/INTA
7.40.2
7. FOE
5.00.2
Used by the manufacture for testing.
(Do not connect externally.)
TEST
SOP14 pin
SON22 pin
VDD
Connected to a positive power supply.
Connected to a ground.
GND
The metal case inside of the molding compound may be exposed on the top or bottom of this product.
This purely cosmetic and does not have any effect on quality, reliability or electrical specs.
Specifications (characteristics)
Refer to application manual for details.
.
Recommended Operating Conditions
Current consumption characteristics
Ta=40C to +85C
Item
Symbol
Conditions
Min.
Typ.
Max.
Unit
Item
Symbol
Conditions
Min. Typ. Max. Unit
VDD
=5V
VDD
=3V
Power voltage
Clock voltage
Operating
VDD
VCLK
3.0
3.0
5.5
5.5
V
V
1.7
1.15
fSCL=0Hz
0.60 1.80
µA
0.48 1.20
FOE=GND
FOUT;output
OFF(LOW)
IBK
TOPR
+25
+85
40
C
temperature
Curent
Consumption
fSCL=0Hz
Frequency characteristics
VDD
=5.5V
VDD,FOE=5.5V
FOUT;output ON
(Output=OPEN;
CL=0pF)
I32k
3.0
6.5
µA
Item
Symbol
Conditions
Range
AA: 551)
AC: 052)
Unit
Ta=+25C
VDD=3.0V
Ta=+25C
VDD=2.0V
Ta=+25C
Frequency
tolerance
Oscillation
start-up time
Frequency voltage
characteristics
6
6
f/f
10
s
1Max.
tSTA
Power supply detection voltage
Ta=30C to +70C
Item
Symbol
Conditions
Min. Typ. Max. Unit
f/V
1Max.
10
VDD=2.0Vto5.5V
High-voltage mode
VDETH
VDD pin
VDD 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).
Low-voltage mode
VDETL
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