Real time clock module
LOW BACKUP VOLTAGE
Epson Toyocom
Product Number (Please contact us)
SERIAL-INTERFACE REAL TIME CLOCK MODULE
RX-4571LC : Q414571C1000100
RX-4571NB : Q41457191000100
RX-4571SA : Q41457151000100
RX - 4571 LC
/
NB
/
SA
•
Built in freque ncy adjusted 32 .768 kHz crysta l unit.
•
Interface Type
:
3-wire serial i nte rface
•
Operating vo ltage ra nge
:
1.6 V to 5.5 V
•
Wide Timekeeper vo ltage ra nge
:
1.0 V to 5.5 V / T
a
= +25
°
C
•
Low backup curre nt
:
0.32
µ
A ( Typ. ) / 3 V
•
32.768 kHz frequency output function
:
C-MOS output With Control Pin
•
Real-time clock function
Actual size
Clock/cale ndar function, a uto leap yea r correction functio n,
alarm i nte rrupt functio n, etc.
RX-4571LC
RX-4571NB
RX-4571SA
Block diagram
Overview
•
32.768 kHz frequency output function
• FOUT pin output ( C-MOS output ) , CL=30 pF
32.768 kHz
CONTROL LINE
•
Timer function
• Timer function which can be set up between
1/4096 second and 4095 minutes.
OSC
DIVIDER
CLOCK and
CALENDAR
TIMER
REGISTER
ALARM
REGISTER
CONTROL
REGISTER
and
SYSTEM
CONTROLLER
•
Alarm function
• Alarm function can be set to any combination of day,
day of week, hour, or minute.
FOUT
FOE
/ IRQ
FOUT
CONTROLLER
INTERRUPTS
CONTROLLER
•
Pin Function
Signal
Name
CE
Input / Output
Input
Input
Bi-directional
Output
Input
Output
-
-
Function
The chip enabled input pin 0.
( It has a built -in pull-down resistance )
The shift clock input pin for serial data transfer.
The data input / output pin for serial data transfer.
32.768 kHz clock output pin with the output control
function. ( C-MOS )
FOE pin control the condition of FOUT with
FSEL1-bit, FSEL0-bit, etc.
Interrupt output ( N-ch open drain )
Connected to a positive power supply.
Connected to a ground.
DIO
CLK
CE
BUS
INTERFACE
CIRCUIT
CLK
DIO
FOUT
FOE
/ IRQ
V
DD
GND
Terminal connection / External dimensions
RX
−
4571 LC
0.5
(Unit:mm)
RX
−
4571 NB
RX
−
4571 SA
1.
2.
3.
4.
5.
6.
7.
GND
N.C.
CE
CLK
5.0
1.27
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
DIO
(GND)
CLK
CE
GND
N.C.
N.C.
FOUT
/IRQ
V
DD
0.5
1.
2.
3.
4.
5.
6.
FOE
N.C.
DIO
CLK
CE
GND
12.
3.6
V
DD
N.C.
N.C.
N.C.
/IRQ
FOUT
1.
FOE
6.3
Ma x.
22.
21.
20.
19.
18.
17.
4.8
1.3
±
0 .1
5.0
±
0.2
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
−
−
14.
10.1
±
0.2
FOUT
N.C.
N.C.
N.C.
/ IRQ
N.C.
V
DD
11.
10.
13.
12.
11.
10.
2.4
9.
1.2
M ax.
16.
15.
14.
13.
12.
DIO
N.C.
FOE
7.4
±
0.2
3.2
±
0.1
8.
7.
9.
8.
2.8
VSOJ
−
12pin
SON
−
22 pin
Metal may be exposed on the top or bottom of this product. This w ill not affect any quality, reliability or electrical spec.
SOP - 14 pin
Specifications (characteristics)
!
Recommended Operating Conditions
Item
Power voltage
Clock voltage
Operating
temperature
Symbol
V
DD
V
CLK
T
OPR
Condition
−
T
a
= +25
°
C
T
a
=
−
40 to +85
°
C
−
Min.
1.6
1.0
1.1
−
40
Typ.
3.0
3.0
3.0
+25
Max.
5.5
5.5
5.5
+85
Unit
V
V
V
°
C
∗
Refer to application manual for details.
!
Current consumption characteristics
Symbol
Condition
CE = GND
/IRQ = OFF
FOUT ;
output OFF ( Hi - z )
CE = GND
/IRQ = OFF
I
32k
FOUT ;
32.768 kHz output
ON
CL = 30 pF
V
DD
=5V
V
DD
=3V
V
DD
=5V
V
DD
=3V
Min.
Typ.
0.40
T
a
=
−40 °C
to +85
°C
Max.
1.00
Unit
I
BK
µA
0.32
0.95
!
Frequency characteristics
Item
Frequency
tolerance
Oscillation
start-up time
Symbol
∆
f/f
Condition
T
a
= +25
°
C
V
DD
= 3.0 V
T
a
= +25
°
C
V
DD
= 1.6 V
Rating
5
±
23
*
1 Max.
Unit
×
10
−6
s
8.0
14.0
µ
A
t
STA
5.0
8.5
*
Please ask for tighter tolerance. (Equivalent to 1 minute of monthly deviation)
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EPSONTOYOCOM [ EPSON TOYOCOM ]
