CY14C512I
CY14B512I
CY14E512I
Contents
Pinout ................................................................................ 3
Pin Definitions .................................................................. 3
I2C Interface ...................................................................... 4
Protocol Overview ............................................................ 4
I2C Protocol – Data Transfer ....................................... 4
Data Validity ................................................................ 5
START Condition (S) ................................................... 5
STOP Condition (P) ..................................................... 5
Repeated START (Sr) ................................................. 5
Byte Format ................................................................. 5
Acknowledge / No-acknowledge ................................. 5
High-Speed Mode (Hs-mode) ..................................... 6
Slave Device Address ................................................. 7
Write Protection (WP) .................................................. 9
AutoStore Operation .................................................... 9
Hardware STORE and HSB pin Operation ................. 9
Hardware RECALL (Power Up) ................................... 9
Write Operation ......................................................... 10
Read Operation ......................................................... 10
Memory Slave Access ............................................... 10
RTC Registers Slave Access .................................... 14
Control Registers Slave ............................................. 16
Serial Number ................................................................. 18
Serial Number Write .................................................. 18
Serial Number Lock ................................................... 18
Serial Number Read .................................................. 18
Device ID ......................................................................... 19
Executing Commands Using Command Register ..... 19
Real Time Clock Operation ............................................ 20
nvTIME Operation ..................................................... 20
Clock Operations ....................................................... 20
Reading the Clock ..................................................... 20
Setting the Clock ....................................................... 20
Backup Power ........................................................... 20
Stopping and Starting the Oscillator .......................... 20
Calibrating the Clock ................................................. 21
Alarm ......................................................................... 21
Watchdog Timer ........................................................ 21
Programmable Square Wave Generator ................... 22
Power Monitor ........................................................... 22
Backup Power Monitor .............................................. 22
Interrupts ................................................................... 22
Interrupt Register ....................................................... 22
Flags Register ........................................................... 23
RTC External Components ....................................... 24
PCB Design Considerations for RTC ............................ 25
Layout requirements .................................................. 25
Maximum Ratings ........................................................... 30
Operating Range ............................................................. 30
DC Electrical Characteristics ........................................ 30
Data Retention and Endurance ..................................... 31
Thermal Resistance ........................................................ 31
AC Test Loads and Waveforms ..................................... 32
AC Test Conditions ........................................................ 32
RTC Characteristics ....................................................... 32
AC Switching Characteristics ....................................... 33
Switching Waveforms .................................................... 33
nvSRAM Specifications ................................................. 34
Switching Waveforms .................................................... 34
Software Controlled STORE/RECALL Cycles .............. 35
Switching Waveforms .................................................... 35
Hardware STORE Cycle ................................................. 36
Switching Waveforms .................................................... 36
Ordering Information ...................................................... 37
Ordering Code Definitions ......................................... 37
Package Diagram ............................................................ 38
Acronyms ........................................................................ 39
Document Conventions ................................................. 39
Units of Measure ....................................................... 39
Document History Page ................................................. 40
Sales, Solutions, and Legal Information ...................... 42
Worldwide Sales and Design Support ....................... 42
Products .................................................................... 42
PSoC® Solutions ...................................................... 42
Cypress Developer Community ................................. 42
Technical Support ..................................................... 42
Document Number: 001-64879 Rev. *J
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