Real time clock module
Product Number (Please contact us)
RX-4574LC : Q414574C2000300
REAL TIME CLOCK MODULE (SPI-Bus)
RX - 4574
LC
Built
in frequency adjusted 32.768 kHz crystal unit.
Interface
Type
:
3-wire serial interface
Operating
voltage range
:
1.6Vto5.5V
Wide
Timekeeper voltage range
:
1.3Vto5.5V
Low
backup current
:
0.35A/3V(Typ.)
32.768
kHz frequency output function
:
C-MOS output With Control Pin
The
various functions include full calendar, alarm, timer.
Actual size
Block
diagram
32.768 kHz
CONTROL LINE
Overview
32.768
kHz frequency output function
• FOUT pin output (C-MOS output), CL=30 pF
• Output frequency is selectable from 1/30Hzto
32.768kHz
(32 Values)
OSC
DIVIDER
CLOCK and
CALENDAR
FOUT
FCON
/ TIRQ
/ AIRQ
DATA
CLK
CE 1
CE 0
Timer
function
OUTPUT
CONTROLLER
INTERRUPTS
CONTROLLER
ALARM
REGISTER
CONTROL
REGISTER
INTERFACE
CIRCUIT
SHIFT REGISTER
TIMER
REGISTER
• Timer function which can be set up between
1/4096 second and 255 minutes.
• It is recorded automatically to TF-bit at the time of event
occurrence, and it’s possible to output with /TIRQ pin output
(open-drain output).
• Selectable one time mode or repeat mode.
Alarm
function
BUS
• Alarm function can be set to any combination of day of
week, hour, or minute.
•It is recorded automatically to AF-bit at the time of event
occurrence, and it’s possible to output with /AIRQ pin output
(open-drain output).
Functions
are compatible with RTC-4574SA/JE/NB.
Pin Function
Signal Name Input / Output
CE0
CE1
CLK
DATA
FOUT
FCON
/ AIRQ
/ TIRQ
V
DD
GND
Input
Input
Input
Bi-directional
Output
Input
Output
Output
-
-
Function
The chip enabled input pin 0. (Built-in pull-down resistance)
When both CE0 and CE1 pins are at the “H” level , access to this
Real time clock module becomes possible.
The chip enabled input pin 1.
When the CE1 pin is at the HIGH level, the FOUT pin is in the output state.
The shift clock input pin for serial data transfer.
The data input / output pin for serial data transfer.
This pin outputs the reference clock signal at 32.768 kHz ( C-MOS output ).
High impedance at the time of output off.
The input pin for the FOUT output control.
The open drain output pin for alarm and time update interrupts.
The open drain output pin for timer interrupt.
Connected to a positive power supply.
Connected to a ground.
Terminal connection/External dimensions
RX4574LC
0.5
(Unit:mm)
1. N.C.
2. N.C.
3. / TIRQ
12. V
DD
3.6
2.4
11. CE1
10. CLK
9. DATA
4. / AIRQ
6. FOUT
1.2
Max.
5. FCON
2.8
8. CE0
7. GND
VSOJ12pin
*Stop using the glue
Any glue must never use it after soldering LC-package to a circuit board.This product
has glass on the back side of a package.When glue invasions between circuit board
side and glass side, then glass cracks by thermal expansion of glue.In this case a
crystal oscillation stops.Consider glue abolition or glue do not touch to LC-package
Specifications (characteristics)
Recommended Operating Conditions
Item
Power voltage
Clock voltage
Operating
temperature
Symbol
V
DD
V
CLK
T
OPR
Conditions
-
-
-
Min.
1.6
1.3
-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
Conditions
V
DD
=5V
V
DD
=3V
V
DD
=5V
V
DD
=3V
Min.
-
T
a
=-40Cto+85C
Typ.
0.45
Max.
0.9
Unit
CE0,CE1=GND
I
BK
FOUT;output OFF
(Hi-z)
µA
-
0.35
0.7
Frequency characteristics
Item
Frequency
tolerance
Oscillation
Start-up time
Symbol
f/f
Conditions
T
a
=+25C
V
DD
=3.0V
T
a
=+25C
V
DD
=1.6V
T
a
=-40Cto+85C
V
DD
=1.6V
Rating
B:
523*
1Max.
3Max.
Unit
10
6
s
s
Current
Consumption
CE0=GND
CE1=V
DD
I
32k
FOUT;
32.768kHz output ON
CL=30pF
-
8.0
20.0
µA
t
STA
-
5.0
12.0
*Equivalent to 1 minute of monthly deviation
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