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Real time clock module
Epson Toyocom
Product Number (Please contact us) RX-4581NB : Q41458191000200
Built-in SRAM SERIAL-INTER FACE REA L TIME C LOCK MODULE
RX - 4581 NB
*Built in frequency adjusted 32.768 kHz crystal unit. *Interface Type : 4-wire serial interface *Operating voltage range : 1.6 V to 5.5 V *Wide Timekeeper voltage range : 1.6 V to 5.5 V *Low backup current : 0.4 A / 3 V ( Typ. ) *Built-in SRAM : Built-in 128 bit ( 8 bit x 16 ) RAM. *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 CLOCK and CALENDAR
Overview
* Built-in SRAM
DIVIDER
* Include 128 bit ( 8 bit x 16 ) RAM.
OSC
* Interface Type
* Serial interface in 4 lines form. It is possible to make it to 3 lines by wired-OR connecting DI and DO pins.
FOUT FOE
FOUT CONTROLLER
TIMER REGISTER
* 32.768 kHz frequency output function
/ AIRQ / TIRQ INTERRUPTS CONTROLLER ALARM REGISTER
* FOUT pin output (C-MOS output), CL=30 pF * FOE pin enables output on/off control.
DI DO CLK CE1 CE0 BUS INTERFACE CIRCUIT
CONTROL REGISTER and SYSTEM CONTROLLER
* Timer function
* 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).
* Interrupt function
RAM 128 bit ( 8 bit x 16 )
* Alarm interrupt function , and timer interrupt function.
Pin Function
Signal Name Input/Output CE0 CE1 CLK DI DO FOUT FOE / AIRQ / TIRQ VDD GND Input Input Input Input Output Output Input Output Output Function 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 )
Terminal connection / External dimensions
RX - 4581 NB
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. GND
0.5
(Unit:mm)
22. 21.
6.3 Max.
N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. - -
CE1 CE0 DI DO CLK / TIRQ / AIRQ FOE FOUT VDD
The shift clock input pin for serial data transfer. The data input pin for serial data trasfer. The data output pin for serial data trasfer. This pin outputs the reference clock signal at 32.768 kHz ( CMOS 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.
20. 19. 18. 17.
4.8 1.3 0.1
16. 15. 14. 13. 12.
5.0 0.2
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.
Specifications (characteristics)
! Recommended Operating Conditions
Item Power voltage Clock voltage Operating temperature Symbol VDD VCLK TOPR Condition Min. 1.6 1.6 -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 Condition CE0, CE1 = GND FOE = GND FOUT ;output OFF
( Hi - z ) Current Consumption
T a = -40 C to +85 C
Min. VDD =5V VDD =3V VDD =5V
Typ. 0.6
Max. 1.2
Unit
IBK
A 0.4 0.8
! Frequency characteristics
Item Frequency tolerance Oscillation start-up time Symbol f/f Condition Ta = +25 C VDD = 3.0 V = +25 C VDD = 3.0 V Ta Rating 5 23 3 Max. Unit x 10-6 s
CE0, CE1 = GND FOE = VDD I32k FOUT ;
8.0
20.0 A
tSTA
32.768 kHz output ON VDD =3V CL = 30 pF
5.0
12.0
Please ask for tighter tolerance. (Equivalent to 1 minute of monthly deviation)
http://www.epsontoyocom.co.jp
"QMEMS" EPSON TOYOCOM
In order to meet customer needs in a rapidly advancing digital, broadband and ubiquitous society, we are committed to offering products that are one step ahead of the market and a rank above the rest in quality. To achieve our goals, we follow a "3D (three device) strategy" designed to drive both horizontal and vertical growth. We will to grow our three device categories of "Timing Devices", "Sensing Devices" and "Optical Devices", and expand vertical growth through a combination of products from these categories. A Quartz MEMS is any high added value quartz device that exploits the characteristics of quartz crystal material but that is produced using MEMS (micro-electro-mechanical system) processing technology. Market needs are advancing faster than previously imagined toward smaller, more stable crystal products, but we will stay ahead of the curve by rolling out products that exceed market speed and quality requirements. We want to further accelerate the 3D strategy by QMEMS. Quartz devices have become crucial in the network environment where products are increasingly intended for broadband, ubiquitous applications and where various types of terminals can transfer information almost immediately via LAN and WAN on a global scale. Epson Toyocom Corporation addresses every single aspect within a network environment. The new corporation offers "Digital Convergence" solutions to problems arising with products for consumer use, such as, core network systems and automotive systems.
PROMOTION OF ENVIRONMENTAL MANAGEMENT SYSTEM CONFORMING TO INTERNATIONAL STANDARDS
At Epson Toyocom, all environmental initiatives operate under ISO 14000 is an international standard for environmental management the Plan-Do-Check-Action(PDCA) cycle designed to achieve that was established by the International Standards Organization in 1996 continuous improvements. The environmental management against the background of growing concern regarding global warming, system (EMS) operates under the ISO 14001 environmental destruction of the ozone layer and global deforestation management standard. All of our major manufacturing and non-manufacturing sites,in Japan and overseas, completed the acquisition of ISO 14001 certification. In the future, new group companies will be expected to acquire the certification around the third year of operations.
WORKING FOR HIGH QUALITY
In order provide high quality and reliable products and services than meet customer needs, Epson Toyocom made early efforts towards obtaining ISO9000 series certification and has acquired ISO9001 for all business establishments in Japan and abroad. We have also acquired ISO/TS 16949 certification that is requested strongly by major automotive manufacturers as standard.
QS-9000 is an enhanced standard for quality assurance systems formulated by leading U.S. automobile manufacturers based on the international ISO 9000 series. ISO/TS 16949 is a global standard based on QS-9000, a severe standard corresponding to the requirements from the automobile industry.
Explanation of the mark that are using it for the catalog
Pb free. Complies with EU RoHS directive. Pb free terminal designed. Contains Pb in products exempted by RoHS directive. (Contains Pb in sealing glass, high melting temperature type solder or other.) Complies with EU RoHS directive. The products have been designed for high reliability applications such as Automotive.
Notice
This material is subject to change without notice. Any part of this material may not be reproduced or duplicated in any form or any means without the written permission of Epson Toyocom. The information, applied circuitry, programming, usage, etc., written in this material is intended for reference only. Epson Toyocom does not assume any liability for the occurrence of infringing on any patent or copyright of a third party. This material does not authorize the licensing for any patent or intellectual copyrights. Any product described in this material may contain technology or the subject relating to strategic products under the control of the Foreign Exchange and Foreign Trade Law of Japan and may require an export license from the Ministry of International Trade and Industry or other approval from another government agency. You are requested not to use the products (and any technical information furnished, if any) for the development and/or manufacture of weapon of mass destruction or for other military purposes. You are also requested that you would not make the products available to any third party who may use the products for such prohibited purposes. These products are intended for general use in electronic equipment. When using them in specific applications that require extremely high reliability, such as the applications stated below, you must obtain permission from Epson Toyocom in advance. / Space equipment (artificial satellites, rockets, etc.) / Transportation vehicles and related (automobiles, aircraft, trains, vessels, etc.) / Medical instruments to sustain life / Submarine transmitters / Power stations and related / Fire work equipment and security equipment / traffic control equipment / and others requiring equivalent reliability. In this new crystal master for Epson Toyocom, product codes and markings will remain as previously identified prior to the merger. Due to the on-going strategy of gradual unification of part numbers, please review product codes and markings, as they will change during the course of the coming months. We apologize for the inconvenience, but we will eventually have a unified part numbering system for Epson Toyocom that will be user friendly.

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