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RX8900SA/CE
Epson RX8900SA/CE User Manual
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ETM45E-01
Preliminary
Application Manua
l
Real Time Clock Module
RX8900SA/CE
2
Table of Contents
Table of Contents
3
Overview
4
Block Diagram
4
Terminal Description
5
Terminal Connections
5
Pin Functions
5
Absolute Maximum Ratings
6
Recommended Operating Conditions
6
Frequency Characteristics
6
Electrical Characteristics
7
DC Characteristics
7
AC Characteristics
8
Use Methods
9
Description of Registers
9
Write / Read and Bank Select
9
Register Table (Basic Time and Calendar Register)
9
Register Table (Extension Register)
10
Details of Registers
11
Clock Counter (SEC - HOUR )
11
Calendar Counter ( WEEK - YEAR )
12
Alarm Registers
13
Fixed-Cycle Timer Control Registers
13
Extension Register
13
Flag Register
14
Control Register
15
Temperature Data Register
17
Backup Power Supply Function Register
17
Fixed-Cycle Timer Interrupt Function
18
Diagram of Fixed-Cycle Timer Interrupt Function
18
Related Registers for Function of Time Update Interrupts
19
Fixed-Cycle Timer Interrupt Interval (Example)
20
Fixed-Cycle Timer Start Timing
20
Time Update Interrupt Function
21
Time Update Interrupt Function Diagram
21
Related Registers for Time Update Interrupt Functions
22
Alarm Interrupt Function
23
Diagram of Alarm Interrupt Function
23
Related Registers
24
Examples of Alarm Settings
25
About the Interrupt Function for Operation /INT="L" Interrupt Output
26
Temperature Compensation Function
26
Related Registers for Temperature Compensation Function
26
Battery Backup Switchover Function
27
Description of Battery Backup Switchover Function
27
Control the Contents of the Power Switching
28
Function that Can be Used in the Backup State
28
Notes on Power Switching Function Is Used
29
Related Registers of the Backup Power Supply Switching Function
29
Reading/Writing Data Via the I 2 C Bus Interface
30
Overview of I 2 C-BUS
30
System Configuration
30
Starting and Stopping I C Bus Communications
31
Data Transfers and Acknowledge Responses During I 2 C-BUS Communications
32
Slave Address
32
I 2 C Bus Protocol
33
Backup and Recovery
34
About Access at the Time of Backup Return and Initial Power Supply
35
Flow Chart
36
Connection with Typical Microcontroller
39
When Used as a Clock Source (32 Khz-TCXO)
39
External Dimensions/Marking Layout
40
Application Notes
42
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Epson RX8900SA/CE Specifications
General
Model
RX8900SA/CE
Supply Voltage
1.6V to 5.5V
Interface
I2C-Bus
Operating Temperature
-40°C to +85°C
Type
Real Time Clock Module
Package
8-Pin MSOP
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