Real time clock module
Product Number (Please contact us)
RX-4581NB : Q41458192000200
REAL TIME CLOCK MODULE (SPI-Bus)
Built-in SRAM
RX-4581NB
Built in frequency adjusted 32.768 kHz crystal unit.
Interface Type
: 4-wire serial interface
: 1.6Vto5.5V
Operating voltage range
Wide Timekeeper voltage range : 1.6Vto5.5V
Low backup current
Built-in SRAM
: 0.4A/3V(Typ.)
:
:
Built-in 128
bit(8bit16)RAM.
Actual size
32.768 kHz frequency output function
C-MOS output With Control Pin
The various functions include full calendar, alarm, timer.
Block diagram
Overview
32.768 kHz
Built-in SRAM
• Include 128bit(8bit16)RAM.
CLOCK
and
CALENDAR
DIVIDER
OSC
Interface Type
• Serial interface in 4 lines form.
It is possible to make it to 3 lines by wired-OR connecting
FOUT
FOE
FOUT
TIMER
DI and DO pins.
CONTROLLER
REGISTER
REGISTER
32.768 kHz frequency output function
• FOUT pin output (C-MOS output), CL=30 pF
• FOE pin enables output on/off control.
/ AIRQ
/ TIRQ
INTERRUPTS
CONTROLLER
ALARM
Timer function
D I
CONTROL
REGISTER
• Timer function can be set up between
1/4096 second and 4095 minutes.
• It is recorded automatic to TF-bit at the time of event
occurrence,and possible to output with /TIRQ pin output
(open-drain output).
BUS
DO
CLK
CE1
CE0
INTERFACE
CIRCUIT
and
SYSTEM
CONTROLLER
Interrupt function
• Alarm interrupt function , and timer interrupt function.
RAM 128 bit
( 8 bit 16 )
Pin Function
Terminal connection/External dimensions
(Unit:mm)
RX
4581NB
N.C.
N.C.
1. GND
2. CE1
3. CE0
4. DI
22.
21.
Signal Name Input/Output
Function
CE0
CE1
CLK
DI
Input
Input
The chip enabled input pin 0. ( It has a built -in pull-down resistance )
The chip enabled input pin 1. (It does not have a built -in pull-down resistance )
The shift clock input pin for serial data transfer.
20. N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
19.
18.
17.
16.
15.
14.
13.
12.
Input
5. DO
Input
The data input pin for serial data trasfer.
6. CLK
7. /TIRQ
DO
Output
The data output pin for serial data trasfer.
4.8
8.
/AIRQ
This pin outputs the reference clock signal at 32.768 kHz ( CMOS output ).
High impedance at the time of output off.
FOUT
Output
1.30.1
9. FOE
10. FOUT
11. VDD
FOE
Input
Output
Output
The input pin for the FOUT output control.
5.00.2
/ AIRQ
The open drain output pin for alarm and time update interrupts.
SON22 pin
/ TIRQ
VDD
The open drain output pin for timer interrupt.
Connected to a positive power supply.
Connected to a ground.
The metal case inside of the molding compound may be exposed
on the top or bottom of this product.
GND
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=-40Cto+85C
Item
Symbol
Conditions
Min.
Typ.
Max.
Unit
Item
Symbol
Conditions
Min. Typ. Max. Unit
Power voltage
Clock voltage
Operating
VDD
VCLK
1.6
1.6
3.0
3.0
5.5
5.5
V
V
VDD
=5V
CE0,CE1=GND
FOE=GND
-
-
-
-
0.6
0.4
1.2
0.8
TOPR
-40
+25
+85
C
IBK
A
A
temperature
FOUT;output OFF
(Hi-z)
VDD
=3V
Frequency characteristics
Current
Consumption
Item
Symbol
Conditions
Rating
Unit
CE0,CE1=GND
FOE= VDD
VDD
=5V
8.0 20.0
5.0 12.0
Frequency
tolerance
Ta=+25C
VDD=3.0V
6
f/f
10
B: 523
3Max.
I32k
FOUT;
32.768kHz output ON
CL=30pF
VDD
=3V
Ta=+25C
VDD=3.0V
Oscillation
start-up time
s
tSTA
Please ask for tighter tolerance. (Equivalent to 1 minute of monthly deviation)
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