CY8C20121-SX1I Cypress Semiconductor Corp, CY8C20121-SX1I Datasheet - Page 2

• Manufacturer Part Number: CY8C20121-SX1I
• Description: CY8C20121-SX1I
• Manufacturer: Cypress Semiconductor Corp
• Series: CapSense Express™ CY8C20xxxr

Specifications of CY8C20121-SX1I

• Controller Type: Capacitive Sensing Controller
• Interface: I²C
• Voltage - Supply: 2.4 V ~ 5.25 V
• Current - Supply: 1.5mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Processor Series: CY8C201xx
• Core: M8C
• Program Memory Type: Flash
• Interface Type: I2C
• Operating Supply Voltage: 2.4 V to 5.25 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: CY3218-CAPEXP1
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3. Contents
Pinouts .............................................................................. 3
Typical Circuits ................................................................. 4
Operating Modes .............................................................. 6
I2C Interface ...................................................................... 6
Registers ........................................................................... 7
Document Number: 001-53516 Rev. *E
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
Normal Mode ............................................................... 6
Setup Mode ................................................................. 6
I2C Device Addressing ................................................ 6
I2C Clock Stretching .................................................... 7
Format for Register Write and Read ........................... 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
Layout Guidelines and Best Practices ......................... 24
Operating Voltages ......................................................... 27
CapSense Constraints ................................................... 27
Electrical Specifications ................................................ 28
Examples of Frequently Used I2C Commands ............ 33
Ordering Information ...................................................... 34
Package Diagram ............................................................ 35
Acronyms ........................................................................ 36
Acronyms Used .............................................................. 36
Document Conventions ................................................. 36
Glossary .......................................................................... 37
Document History Page ................................................. 42
Sales, Solutions, and Legal Information ...................... 43
CS_READ_BUTTON ................................................. 20
CS_READ_BLx ......................................................... 21
CS_READ_DIFFx ...................................................... 21
CS_READ_RAWx ..................................................... 21
CS_READ_STATUS ................................................. 22
COMMAND_REG ...................................................... 22
Example PCB Layout Design with
Two CapSense Buttons and Two LEDs .................... 26
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 I
Ordering Code Definitions ......................................... 34
Units of Measure ....................................................... 36
Numeric Conventions ................................................ 36
Worldwide Sales and Design Support ....................... 43
Products .................................................................... 43
PSoC Solutions ......................................................... 43
2
C Specifications ................................................ 31
CY8C20111, CY8C20121
Page 2 of 43
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