Q42724211000200.pdf 데이터시트 (총 27 페이지) - 파일 다운로드 Q42724211000200 데이타시트 다운로드

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Order code
90-0362
Manufacturer code
Q42724211000200
DATA SHEET
Description
RTC-72421B REAL TIME CLOCK DIL18 RC
The enclosed information is believed to be correct, Information may change without noticedue to
product improvement. Users should ensure that the product is suitable for their use. E. & O. E.
Page 1 of 27
Revision A
20/02/2007
Sales: 01206 751166
Sales@rapidelec.co.uk
Technical: 01206 835555
Tech@rapidelec.co.uk
Fax: 01206 751188
www.rapidonline.com
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RM0007-E01
Application Manual
Real Time Clock Module
RTC-72421/3
Model
72421
72423
Product Number
Q42724211xxxx00
Q42724231xxxx00
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NOTICE
• The 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 circuit, program, usage etc., written in this material is just for reference.
Epson Toyocom does not assume any liability for the occurrence of infringing 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 licence 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 applications stated below, it is required to
obtain the 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 manual for Epson Tyocom, product code and marking will still remain as previously
identified prior to the merger.Due to the on going strategy of gradual unification of part numbers, please
review product code and marking 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 which will be user friendly.
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RTC - 72421 / 72423
CONTENTS
! Overview..............................................................................................1
! Block diagram ......................................................................................1
! Terminal connections...........................................................................2
! Terminal functions ...............................................................................3
! Characteristics .....................................................................................4
1. Absolute maximum ratings ....................................................................................... 4
2. Recommended operating conditions......................................................................... 4
3. Frequency characteristics and current consumption characteristics ......................... 4
4. Electrical characteristics ( DC characteristics ) ......................................................... 4
! Switching characteristics (AC characteristics) .....................................5
1. When ALE is used .................................................................................................... 5
2. When ALE is fixed at VDD......................................................................................... 6
! Registers .............................................................................................7
1. Register table ........................................................................................................... 7
2. Notes ........................................................................................................................ 7
3. Functions of register bits (overview) ......................................................................... 7
4. Setting the fixed-period pulse output mode and fixed-period interrupt mode ............ 8
5. Resetting the fixed-period pulse output mode and fixed-period interrupt mode......... 8
! Register description .............................................................................9
1. Timing registers ........................................................................................................ 9
2. CD register (control register D) ............................................................................... 10
3. CE register (control register E) ............................................................................... 11
4. CF register (control register F)................................................................................ 13
! Using the RTC-72421/RTC-72423.....................................................14
1. Power-on procedure (initialization).......................................................................... 14
2. Read/write of S1 to W registers .............................................................................. 16
3. Write to 30-second ADJ bit ..................................................................................... 16
4. Using the CS1 pin ................................................................................................... 17
! Power supply circuit example.............................................................17
! Examples of connection to general-purpose microprocessor.............18
! External dimensions ..........................................................................19
! Marking layout ...................................................................................19
! Reference data ..................................................................................20
! Application notes ...............................................................................21
1. Notes on handling................................................................................................... 21
2. Notes on packaging................................................................................................ 21
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RTC - 72421 / 72423
4-BIT PARALLEL INTERFACE REAL TIME CLOCK MODULE
RTC - 72421 / 72423
Built-in crystal unit removes need for adjustment and reduces installation costs
Microprocessor bus compatible ( tWW, tRD = 120 ns )
Use of C-MOS IC enables low current consumption ( 5 µA Max., at VDD = 2.0 V )
Compatibility with Intel CPU bus
Address latch enable (ALE) pin compatible with multiplex bus CPUs
Time (hours, minutes, seconds) and calendar (year, month, day) counter
24-hour/12-hour switchover and automatic leap-year correction functions
Fixed-period interrupt function
30-seconds correction (adjustment) function
Stop, start, and reset functions
Battery back-up function
Same mounting conditions as general-purpose SMD ICs possible (RTC-72423)
Pins and functions compatible with the SMC-5242 series
! Overview
The RTC-72421/RTC-72423 module is a real time clock that can be connected directly to a microprocessor's bus. Its built-in crystal
unit enables highly accurate time-keeping with no physical access required for adjustment and, since there is no need to connect
external components, mounting and other costs can be reduced.
In addition to its time and calendar functions, the RTC-72421/RTC-72423 enables the use of 30-seconds correction and fixed-
period interrupt functions.
The RTC-72421/RTC-72423 module is ideally suited for applications requiring timing management, such as personal computers,
dedicated word-processors, fax machines, multi-function telephones, and sequencers.
! Block diagram
D3
D2 Gate
D1
D0
WR
RD Gate
OSC
Counter
RTC-72421/72423
RESET
bit
30sec ADJ
bit
STOP
bit
HOLD BUSY
bit bit
S1 S10
MI1 MI10
24/12
bit
H1 H10
W
A3
A2
A1
A0
CS0
Latch
S1 to CF
Decoder
D1 D10
MO1 MO10
Y1 Y10
Output Selector
ALE
CS1
64 Hz
1 Second carry
CD CE CF 1 Minute carry
1 Hour carry
STD.P
Page 1
ETM17E-01
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