Real time clock module
Product Number (Please contact us)
RX-4581NB : Q41458191000200
REAL TIME CLOCK MODULE (SPI-Bus)
Built-in SRAM
RX - 4581 NB
Built in frequency adjusted 32.768 kHz crystal unit.
Interface Type : 4-wire serial interface
Operating voltage range : 1.6Vto5.5V
Wide Timekeeper voltage range : 1.6Vto5.5V
Low backup current : 0.4 A / 3V (Typ. )
Built-in SRAM : Built-in 128 bit ( 8 bit 16 ) 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 ( 8bit 16 ) RAM.
CLOCK
DIVIDER
and
OSC
CALENDAR
Interface Type
Serial interface in 4 lines form.
It is possible to make it to 3 lines by wired-OR connecting
FOUT FOUT TIMER
DI and DO pins.
FOE CONTROLLER REGISTER
32.768 kHz frequency output function
/ AIRQ INTERRUPTS ALARM
FOUT pin output (C-MOS output), CL=30 pF
/ TIRQ
CONTROLLER REGISTER
FOE pin enables output on/off control.
Timer function
D I CONTROL
Timer function can be set up between
REGISTER
DO BUS
1/4096 second and 4095 minutes.
CLK
INTERFACE
and It is recorded automatic to TF-bit at the time of event
CE1
CIRCUIT occurrence,and possible to output with /TIRQ pin output
SYSTEM
CE0 (open-drain output).
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.
Signal Name Input/Output Function 1. GND 22.
N.C.
2. CE1 21.
CE0 Input The chip enabled input pin 0. ( It has a built -in pull-down resistance )
3. CE0 20. N.C.
CE1 Input The chip enabled input pin 1. (It does not have a built -in pull-down resistance )
N.C.
4. DI 19.
CLK Input The shift clock input pin for serial data transfer.
N.C.
5. DO 18.
DI Input The data input pin for serial data trasfer.
N.C.
6. CLK 17.
DO Output The data output pin for serial data trasfer. 4.8
N.C.
7. /TIRQ 16.
N.C.
This pin outputs the reference clock signal at 32.768 kHz ( CMOS output ). 8. /AIRQ 15.
FOUT Output 1.3 0.1
High impedance at the time of output off. N.C.
9. FOE 14.
10. FOUT 13.
FOE Input The input pin for the FOUT output control.
5.0 0.2
11. VDD 12.
/ AIRQ Output The open drain output pin for alarm and time update interrupts.
SON22 pin
/ TIRQ Output The open drain output pin for timer interrupt.
VDD - Connected to a positive power supply.
The metal case inside of the molding compound may be exposed
GND - Connected to a ground.
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 =-40 C to+85C
Item Symbol Conditions Min. Typ. Max. Unit Item Symbol Conditions Min. Typ. Max. Unit
Power voltage VDD - 1.6 3.0 5.5 V
VDD
Clock voltage VCLK - 1.6 3.0 5.5 V
CE0, CE1=GND - 0.6 1.2
=5V
Operating
FOE=GND
TOPR - -40 +25 +85 C
IBK A
temperature
FOUT;output OFF
VDD
- 0.4 0.8
(Hi- z)
=3V
Frequency characteristics
Current
Consumption
Item Symbol Conditions Rating Unit
CE0, CE1=GND VDD
- 8.0 20.0
FOE= VDD =5V
Frequency Ta= +25 C
6
f / f 10
B: 5 23
tolerance
VDD = 3.0 V I32k A
FOUT;
VDD
32.768kHz output ON
Oscillation Ta= +25 C - 5.0 12.0
tSTA 3 Max. s =3V
CL= 30pF
start-up time
VDD = 3.0 V
Please ask for tighter tolerance. (Equivalent to 1 minute of monthly deviation)
0.5
6.3Max.
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Explanation of the mark that are using it for the catalog
Pb free.
Complies with EU RoHS directive.
*About the products without the Pb-free mark.
Contains Pb in products exempted by EU RoHS directive.
(Contains Pb in sealing glass, high melting temperature type solder or other.)
Designed for automotive applications such as Car Multimedia, Body Electronics, Remote Keyless Entry etc.
Designed for automotive applications related to driving safety (Engine Control Unit, Air Bag, ESC etc ).
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