CY8C20121 datasheet(2/43 Pages) CYPRESS

2 / 43 page

CY8C20111, CY8C20121

Document Number: 001-53516 Rev. *G

Page 2 of 43

3. Contents

Pinouts .............................................................................. 3

Typical Circuits ................................................................. 4

Circuit-1: One Button and One LED[1] ........................ 4

Circuit-2: One Button and One LED with

I2C Interface ................................................................ 4

Circuit-3: Two Buttons and Two LEDs with

I2C Interface ................................................................ 5

Circuit-4: Compatibility with 1.8 V I2C Signaling[2] ..... 5

Circuit-5: Powering Down CapSense Express

Device for Low Power Requirements .......................... 6

Operating Modes .............................................................. 6

Normal Mode ............................................................... 6

Setup Mode ................................................................. 6

I2C Interface ...................................................................... 6

I2C Device Addressing ................................................ 6

I2C Clock Stretching .................................................... 7

Format for Register Write and Read ........................... 7

Registers ........................................................................... 7

OUTPUT_STATUS ................................................... 10

OUTPUT_PORT ........................................................ 10

CS_ENABLE ............................................................. 10

DIG_ENABLE ............................................................ 11

SET_STRONG_DM .................................................. 11

OP_SEL_x ................................................................. 13

LOGICAL_OPR_INPUTx .......................................... 13

CS_NOISE_TH ......................................................... 14

CS_BL_UPD_TH ....................................................... 14

CS_SETL_TIME ........................................................ 14

CS_OTH_SET ........................................................... 15

CS_HYSTERISIS ...................................................... 15

CS_DEBOUNCE ....................................................... 16

CS_NEG_NOISE_TH ................................................ 16

CS_LOW_BL_RST .................................................... 16

CS_FILTERING ......................................................... 17

CS_SCAN_POS_x .................................................... 17

CS_FINGER_TH_x ................................................... 18

CS_IDAC_x ............................................................... 18

I2C_ADDR_LOCK ..................................................... 18

DEVICE_ID ............................................................... 19

DEVICE_STATUS ..................................................... 19

I2C_ADDR_DM ......................................................... 20

CS_READ_BUTTON ................................................. 20

CS_READ_BLx ......................................................... 21

CS_READ_DIFFx ...................................................... 21

CS_READ_RAWx ..................................................... 21

CS_READ_STATUS ................................................. 22

COMMAND_REG ...................................................... 22

Layout Guidelines and Best Practices ......................... 24

Example PCB Layout Design with

Two CapSense Buttons and Two LEDs .................... 26

Operating Voltages ......................................................... 27

CapSense Constraints ................................................... 27

Electrical Specifications ................................................ 28

Absolute Maximum Ratings ....................................... 28

Operating Temperature ............................................. 28

DC Electrical Characteristics ..................................... 28

DC Chip Level Specifications .................................... 28

DC GPIO Specifications ............................................ 28

DC POR and LVD Specifications .............................. 29

DC Flash Write Specifications ................................... 29

DC I2C Specifications ............................................... 30

CapSense Electrical Characteristics ......................... 30

AC Electrical Specifications ....................................... 31

AC Chip-Level Specifications .................................... 31

AC GPIO Specifications ............................................ 31

AC I2C Specifications ................................................ 31

Examples of Frequently Used I2C Commands ............ 33

Ordering Information ...................................................... 34

Ordering Code Definitions ......................................... 34

Thermal Impedances ...................................................... 34

Solder Reflow Specifications ........................................ 34

Package Diagram ............................................................ 35

Acronyms ........................................................................ 36

Acronyms Used .............................................................. 36

Document Conventions ................................................. 36

Units of Measure ....................................................... 36

Numeric Conventions ................................................ 36

Glossary .......................................................................... 37

Document History Page ................................................. 42

Sales, Solutions, and Legal Information ...................... 43

Worldwide Sales and Design Support ....................... 43

Products .................................................................... 43

PSoC Solutions ......................................................... 43

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