em3027 EM Microelectronic, em3027 Datasheet - Page 2

• Manufacturer Part Number: em3027
• Description: Real-time Clock With I2c Or Spi Interface, Crystal Temperature Compensation, Battery Switchover And Trickle Charger
• Manufacturer: EM Microelectronic

Table of contents
Table of contents..................................................................................................................................................................... 2
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Copyright © 2008, EM Microelectronic-Marin SA
07/08 – rev B
2.1
2.2
2.3
2.4
4.1
4.2
4.3
4.4
7.1
7.2
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
8.10
8.11
8.12
8.13
9.1
9.2
10.1
10.2
12.1
12.2
Packages / Pin Out Configuration .................................................................................................................................... 3
Absolute Maximum Ratings.............................................................................................................................................. 4
Electrical Characteristics .................................................................................................................................................. 4
EM 3027 Block Diagram and Application Schematic........................................................................................................ 6
Memory Mapping.............................................................................................................................................................. 9
Definitions of terms in the memory mapping .................................................................................................................. 10
Serial communication ..................................................................................................................................................... 12
Functional Description.................................................................................................................................................... 15
Power Management ....................................................................................................................................................... 19
Handling Procedures................................................................................................................................................. 4
Operating Conditions ................................................................................................................................................ 4
Crystal characteristics ............................................................................................................................................... 4
EEPROM Characteristics .......................................................................................................................................... 4
Block Diagram........................................................................................................................................................... 6
Application Schematic ............................................................................................................................................... 6
Crystal Thermal Behaviour........................................................................................................................................ 7
Crystal Calibration..................................................................................................................................................... 8
How to perform READ/WRITE through I2C ............................................................................................................ 12
How to perform READ/WRITE through SPI ............................................................................................................ 13
Start after power-up ................................................................................................................................................ 15
Normal Mode functionality....................................................................................................................................... 15
Watch and Alarm functionality................................................................................................................................. 15
Timer function ......................................................................................................................................................... 15
Temperature sensor................................................................................................................................................ 16
Temperature compensation .................................................................................................................................... 16
EEPROM memory................................................................................................................................................... 16
RAM User Memory.................................................................................................................................................. 17
Status Register........................................................................................................................................................ 18
Power Supplies, Switchover and Trickle Charge..................................................................................................... 19
Low Supply Detection ............................................................................................................................................. 20
AC Characteristics .................................................................................................................................................. 21
Using EM3027 with disturbed Supply Voltage on V
Package Information ............................................................................................................................................... 26
Ordering Information ............................................................................................................................................... 27
Interrupts ............................................................................................................................................................ 18
Self-Recovery System ........................................................................................................................................ 18
Register Map ...................................................................................................................................................... 18
Xtal Oscillator and Prescaler .............................................................................................................................. 18
AC characteristics – I2C ..................................................................................................................................... 21
AC characteristics – SPI..................................................................................................................................... 23
TSSOP-08/14 ..................................................................................................................................................... 26
SO-8................................................................................................................................................................... 26
R
CC
............................................................................................. 25
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