Epson RX8130CE - Page 43

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15 Battery backup switchover function

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ETM50E-07 Seiko Epson Corporation 42

Figure 32 Battery backup (SW1, SW2 automatic control)

Main Page

ETM50E Revision History3
Table of Contents5
Overview7
Block Diagram7
Terminal Description8
Terminal Connections8
Pin Functions8
Examples of External Connection9
Examples of Power Supply Connection9
External Dimensions / Marking Layout10
Absolute Maximum Ratings11
Recommended Operating Conditions11
Frequency Characteristics11
Electrical Characteristics12
Interface Timing When Power Is Turned on / off16
Restrictions of I 2 C-Bus Interface in the Initial Power on16
Precautions for Power on / off16
VDD on / off When Using Power Switching (INIEN = 1)17
VDD on / off When Power Switching Is Not Used (INIEN = 0)17
Reference Information18
Application Notes19
Overview of Functions and Registers20
Overview of Functions20
Register Table21
Register Initial Value and Read/Write Operation Table22
Description of Registers23
Clock and Calendar Registers (0H ~ 16H)23
RAM Registers (20H ~ 23H)23
Alarm Registers (17H ~ 19H)23
Timer Setting and Timer Counter Register for Wakeup Timer (1Ah ~ 1Eh)23
Function-Related Register 1 (1Ch ~ 1Eh)23
Function-Related Register 2 (1Fh)24
Digital Offset Register (30H)24
Functions25
Clock Calendar Explanation25
Clock Counter25
Week Counter26
Calendar Counter26
Wakeup Timer Interrupt Function27
Related Registers for Function of Wakeup Timer Interrupt Function27
Wakeup Timer Start Timing30
Wakeup Timer Interrupt Interval (Example)31
Diagram of Wakeup Timer Interrupt Function31
Alarm Interrupt Function33
Related Registers for Alarm Interrupt Functions33
Examples of Alarm Settings34
Time Update Interrupt Function36
Related Registers for Time Update Interrupt Functions36
Time Update Interrupt Function Diagram37
Oscillation Stop Detection Function38
Related Registers for Oscillation Stop and Voltage Low Detect Function38
FOUT Function38
FOUT Control Register38
FOUT Function Table38
Battery Backup Switchover Function39
Description of Battery Backup Switchover Function39
Reference Characteristics of Switching Elements39
Reference Characteristics of the Charge Current40
Re-Chargeable Battery Voltage Current Features40
Related Register of Battery Backup Switchover Function41
Detection Voltage Setting46
Power Supply Control48
Main Power Supply49
Backup Power Supply50
BAT ) Voltage and a Charge State50
Reset Output Function51
Digital Offset Function52
Digital Offset Register52
Effect of the Digital Offset Function to Other Functions53
Flow-Chart54
Initializing Example54
Software Reset55
Example of Initialization Routine56
Example of Initialization Routine (Only Clock Usage)57
The Setting of the Clock and Calendar57
The Reading of the Clock and Calendar58
Setting Example of the Wakeup Timer Interrupt Function58
Setting Example of the Alarm Interrupt Function59
Serial Communication60
Overview of I C-Bus Interface60
Data Transfers60
Starting and Stopping I C-Bus Communications60
Slave Address60
System Configuration61
I 2 C-Bus Protocol62
Circuit Diagram Connection64
Typical MCU Connection64
Khz Oscillator Application Connection65
Tables66
Figures67
Contacts69

Epson RX8130CE - Page 43

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