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Contents
Product Features
...............................................................................................................................................................................1
PT0205(02/07)
Ver: 1
2
Data Sheet
PT7C4337
Real-time Clock Module (I
2
C Bus)
Product Description
..........................................................................................................................................................................1
Pin Assignment
..................................................................................................................................................................................3
Pin Description
..................................................................................................................................................................................3
Function Block
..................................................................................................................................................................................4
Recommended Layout for Crystal
..................................................................................................................................................4
Crystal Specifications
.......................................................................................................................................................................4
Function Description
.........................................................................................................................................................................5
Overview of Functions
..................................................................................................................................................................5
Registers
.........................................................................................................................................................................................6
Control and status register...........................................................................................................................................................7
Oscillator related bits..............................................................................................................................................................7
Square wave frequency selection bits .....................................................................................................................................7
Interrupt related bits................................................................................................................................................................8
Time Counter..............................................................................................................................................................................9
Days of the week Counter.........................................................................................................................................................10
Calendar Counter ......................................................................................................................................................................10
Alarm Register..........................................................................................................................................................................11
Alarm Function
...........................................................................................................................................................................12
I
2
C Bus Interface
.............................................................................................................................................................................14
Overview of I
2
C-BUS
..................................................................................................................................................................14
System Configuration
.................................................................................................................................................................14
Starting and Stopping I
2
C Bus Communications
.....................................................................................................................15
Slave Address
..............................................................................................................................................................................17
Maximum Ratings
...........................................................................................................................................................................19
Recommended Operating Conditions
...........................................................................................................................................19
DC Electrical Characteristics
.........................................................................................................................................................20
AC Electrical Characteristics
.........................................................................................................................................................21
Mechanical Information
.................................................................................................................................................................22