CY14B256PA-SFXI datasheet(2/44 Pages) CYPRESS

Part #	CY14B256PA-SFXI

Description	256-Kbit (32 K x 8) SPI nvSRAM with Real Time Clock Infinite read, write, and RECALL cycles

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Manufacturer	CYPRESS [Cypress Semiconductor]

Direct Link	http://www.cypress.com

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CY14C256PA

CY14B256PA

CY14E256PA

Document #: 001-65281 Rev. *B

Page 2 of 44

Contents

Pinout ................................................................................ 3

Pin Definitions .................................................................. 3

Device Operation .............................................................. 4

SRAM Write ................................................................. 4

SRAM Read ................................................................ 4

STORE Operation ....................................................... 4

AutoStore Operation .................................................... 4

Software STORE Operation ........................................ 5

Hardware STORE and HSB pin Operation ................. 5

RECALL Operation ...................................................... 5

Hardware RECALL (Power Up) ................................... 5

Software RECALL ....................................................... 5

Disabling and Enabling AutoStore ............................... 5

Serial Peripheral Interface ............................................... 6

SPI Overview ............................................................... 6

SPI Modes ......................................................................... 7

SPI Operating Features .................................................... 8

Power-Up .................................................................... 8

Power-On Reset .......................................................... 8

Power Down ................................................................ 8

Active Power and Standby Power Modes ................... 8

SPI Functional Description .............................................. 9

Status Register ............................................................... 10

Read Status Register (RDSR) Instruction ................. 10

Fast Read Status Register (FAST_RDSR)

Instruction ......................................................................... 10

Write Status Register (WRSR) Instruction ................ 10

Write Protection and Block Protection ......................... 11

Write Enable (WREN) Instruction .............................. 11

Write Disable (WRDI) Instruction .............................. 12

Block Protection ........................................................ 12

Hardware Write Protection (WP Pin) ......................... 12

Memory Access .............................................................. 12

Read Sequence (READ) Instruction .......................... 12

Fast Read Sequence (FAST_READ) Instruction ...... 12

Write Sequence (WRITE) Instruction ........................ 13

RTC Access ..................................................................... 15

READ RTC (RDRTC) Instruction .............................. 15

Fast Read Sequence (FAST_RDRTC) Instruction .... 15

WRITE RTC (WRTC) Instruction ............................... 16

nvSRAM Special Instructions ........................................ 17

Software STORE (STORE) Instruction ..................... 17

Software RECALL (RECALL) Instruction .................. 17

AutoStore Enable (ASENB) Instruction ..................... 17

AutoStore Disable (ASDISB) Instruction ................... 17

Special Instructions ....................................................... 17

SLEEP Instruction ..................................................... 17

Serial Number ................................................................. 18

WRSN (Serial Number Write) Instruction .................. 18

RDSN (Serial Number Read) Instruction ................... 19

FAST_RDSN (Fast Serial Number Read)

Instruction ......................................................................... 19

Device ID ......................................................................... 20

RDID (Device ID Read) Instruction ........................... 20

FAST_RDID (Fast Device ID Read) Instruction ........ 21

HOLD Pin Operation ................................................. 21

Real Time Clock Operation ............................................ 22

nvTIME Operation ..................................................... 22

Clock Operations ....................................................... 22

Reading the Clock ..................................................... 22

Setting the Clock ....................................................... 22

Backup Power ........................................................... 22

Stopping and Starting the Oscillator .......................... 22

Calibrating the Clock ................................................. 23

Alarm ......................................................................... 23

Watchdog Timer ........................................................ 23

Programmable Square Wave Generator ................... 24

Power Monitor ........................................................... 24

Backup Power Monitor .............................................. 24

Interrupts ................................................................... 24

Interrupt Register ....................................................... 24

Flags Register ........................................................... 25

Best Practices ................................................................. 31

Maximum Ratings ........................................................... 32

DC Electrical Characteristics ........................................ 32

Data Retention and Endurance ..................................... 33

Capacitance .................................................................... 33

Thermal Resistance ........................................................ 33

AC Test Conditions ........................................................ 34

RTC Characteristics ....................................................... 35

AC Switching Characteristics ....................................... 35

AutoStore or Power-Up RECALL .................................. 37

Switching Waveforms .................................................... 37

Software Controlled STORE/RECALL Cycles .............. 38

Hardware STORE Cycle ................................................. 39

Ordering Information ...................................................... 40

Ordering Code Definitions ......................................... 40

Package Diagram ............................................................ 41

Acronyms ........................................................................ 42

Document Conventions ................................................. 42

Units of Measure ....................................................... 42

Document History Page ................................................. 43

Sales, Solutions, and Legal Information ...................... 44

Worldwide Sales and Design Support ....................... 44

Products .................................................................... 44

PSoC Solutions ......................................................... 44

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