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RTC-72421

Epson RTC-72421 User Manual

Name: Epson RTC-72421
Brand: Epson
Rating: 4 (1 reviews)

29 pages

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Real Time Clock Module

Application Manual

MQ162-01

RTC-72421/ 72423

Table of Contents3
Overview5
Block Diagram6
Pin Connections6
Pin Functions7
Characteristics8
Absolute Maximum Ratings8
Operating Conditions8
Frequency Characteristics and Current Consumption Characteristics8
Electrical Characteristics (DC Characteristics)9
Switching Characteristics (AC Characteristics)10
When ALE Is Used10
When ALE Is Fixed at12
Registers13
Register Table13
Notes13
Functions of Register Bits (Overview)14
Setting the Fixed-Period Pulse Output Mode and Fixed-Period Interrupt Mode14
Resetting the Fixed-Period Pulse Output Mode and Fixed-Period Interrupt Mode14
Register Description15
Timing Registers15
- S 1 to y 10 Registers15
- W Register15
- Register (PM/AM15
- Y 1 and y 10 Registers15
- Out-Of-Range Data15
C D Register (Control Register16
- HOLD Bit16
- BUSY Bit16
- IRQ FLAG Bit16
- 30-Second ADJ Bit17
C E Register (Control Register17
- MASK Bit17
- ITRPT/STND Bit18
- T (D 2 ), T 1 (D 3 ) Bits18
C F Register (Control Register19
- RESET Bit19
- STOP Bit19
- 24/12 Bit19
- TEST Bit19
Using the RTC-72421/RTC-7242320
Power-On Procedure (Initialization)20
Read/Write of S to W Registers22
Write to 30-Second ADJ Bit22
Using the CS Pin23
- Functions23
- Timing23
- Note23
Power Supply Circuit Example23
Examples of Connection to General-Purpose Microprocessor24
Connection to Multiplexed Bus Type24
Connection to Z80 or Compatible CPU24
Connection to 68-Series MPU24
Reference Data25
Frequency Temperature Characteristics (Typical)25
Frequency Voltage Characteristics (Typical)25
Current Consumption Voltage Characteristics (Typical)25
External Dimensions26
Rtc-7242126
Rtc-7242326
Marking Layout26
- Treatment of Unused Input Pins26
Application Notes27
Notes on Handling27
- Static Electricity27
- Noise27
- Voltage Levels of Input Pins27
Notes on Mounting28
- Soldering Temperature Conditions28
- Mounting Equipment28
- Ultrasonic Cleaning28
- Mounting Orientation28
- Leakage between Pins28

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Epson RTC-72421 Specifications

General

Brand	Epson
Model	RTC-72421
Category	Control Unit
Language	English

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Epson RTC-72421 User Manual

Table of Contents

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Epson RTC-72421 Specifications

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