Real time clock module
Epson Toyocom
Product Number (Please contact us)
RX-4045SA : Q41404551xxxx00
RX-4045NB : Q41404591xxxx00
High-Stability Frequency
SERIAL-INTER FACE REA L TIME C LOCK MODULE
RX - 4045 SA
/
NB
•Built-in
32.768 kHz crystal unit
:
Frequency adjusted for high accuracy.
(± 5
×10
−
6
/ T
a
= +25
°C)
•Interface
Type
:
4-wire serial interface
•Operating
voltage range
:
1.7
V to 5.5 V
•Wide
Timekeeper voltage range
:
1.15
V to 5.5 V
•Various
detection Functions
:
Oscillation stop detection function etc.
•Low
backup current
:
0.48
µA
/ 3 V (Typ.)
•32.768
kHz clock frequency output
:
N-ch open drain output
•Function
of time and calendar, the various detection function,
and interrupt function etc.
Actual size
RX-4045SA
RX-4045NB
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
32kHz
OUTPUT
CONTROL
COMPARATOR_W
ALARM_W REGISTER
(MIN,HOUR, WEEK)
ALARM_D REGISTER
(MIN,HOUR)
VOLTAGE
DETECT
V
DD
COMPARATOR_D
•
The various detection Function
GND
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
CLK
I/O
CONTROL
DI
DO
•
Equipped with alarm and timer
▪
Timer function produces a periodic interruption signal.
As for the Alarm function an optional combination is
produced. (Date of the week , time , minute)
/INT
INTERRUPT CONTROL
SHIFT REGISTER
CE
Pin function
Signal
Name
CE
CLK
DI
DO
FOUT
/ INT
TEST
V
DD
GND
Input /
Output
Input
Input
Input
Output
Output
Output
-
-
-
Function
The chip enabled input pin.
( built -in pull-down resistance )
At the " H " level, access becomes possible.
The shift clock input pin for serial data transfer.
The data input pin for serial data transfer.
The data output pin for serial data transfer.
32.768 kHz clock output pin with the output control
function ( N-ch open drain )
High impedance at the time of output off.
Interrupt output ( N-ch open drain )
∗
Used by the manufacturer for testing.
(Do not connect externally.)
Connected to a positive power supply.
Connected to a ground.
Terminal connection / External dimensions
RX
−
4045 SA
1.
2.
3.
4.
5.
6.
7.
N.C.
CLK
FOUT
N.C.
TEST
3.2
±
0.1
5.0
1.27
(Unit:mm)
RX
−
4045 NB
0.5
14.
10.1
±
0.2
N.C.
DO
DI
GND
/ INT
N.C.
N.C.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
CE
V
DD
(GND)
TEST
FOUT
CLK
DO
DI
GND
/ INT
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.
9.
8.
V
DD
CE
7.4
±
0 .2
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)
!
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
∗
Refer to application manual for details.
!
Current consumption characteristics
Item
Symbol
T
a
=
−40 °C
to +85
°C
Condition
CE = GND
V
DD
=5V
V
DD
=3V
V
DD
=3V
Min.
Typ.
0.60
0.48
Max.
1.80
Unit
I
BK
Current
Consumption
FOUT ;
output OFF
(Hi-z)
µA
1.20
!
Frequency characteristics
Item
Frequency
tolerance
Oscillation
start-up time
Frequency / voltage
characteristics
∗
1)
∗
2)
CE = GND
Condition
Rating
AA: 5
±
5
AC: 0
±
5
1
Max.
±
1
Max.
∗
1)
∗2)
Symbol
∆
f/f
Unit
×
10
−
s
×
10
−
6
6
I
32k
FOUT ;
32.768 kHz
output ON
0.65
2.00
µA
t
STA
f/V
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
!
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
Equivalent to
13
seconds of monthly deviation (excluding offset.)
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EPSONTOYOCOM [ EPSON TOYOCOM ]
