CY14C256I
CY14B256I, CY14E256I
Contents
Pinouts .............................................................................. 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
Serial Data Format in Hs-mode ................................... 6
Slave Device Address ...................................................... 7
Memory Slave Device ................................................. 7
RTC Registers Slave Device ....................................... 7
Control Registers Slave Device ................................... 7
Memory Control Register ............................................ 8
Command Register ..................................................... 8
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
Write nvSRAM ........................................................... 10
Current nvSRAM Read .............................................. 12
Random Address Read ............................................. 13
RTC Registers Slave Access ......................................... 14
Write RTC Registers ................................................. 14
Current Address RTC Registers Read ...................... 15
Random Address RTC Registers Read .................... 15
Control Registers Slave ................................................. 16
Write Control Registers ............................................. 16
Current Control Registers Read ................................ 17
Random Control Registers Read .............................. 17
Serial Number ................................................................. 18
Serial Number Write .................................................. 18
Serial Number Lock ................................................... 18
Serial Number Read .................................................. 18
Device ID Read ......................................................... 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
Best Practices ................................................................. 29
Maximum Ratings ........................................................... 30
Operating Range ............................................................. 30
DC Electrical Characteristics ........................................ 30
Data Retention and Endurance ..................................... 31
Thermal Resistance ........................................................ 31
AC Test Conditions ........................................................ 32
RTC Characteristics ....................................................... 32
AC Switching Characteristics ....................................... 33
nvSRAM Specifications ................................................. 34
Software Controlled STORE/RECALL Cycles .............. 35
Hardware STORE Cycle ................................................. 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 ...................... 41
Worldwide Sales and Design Support ....................... 41
Products .................................................................... 41
PSoC Solutions ......................................................... 41
Document #: 001-65230 Rev. *B
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