My Inquiry
My Account
Cypress Semiconductor Corp CY8C20121-SX1IT
- Part No.:
- CY8C20121-SX1IT
- Manufacturer:
- Cypress Semiconductor Corp
- Category:
- Sensor, Capacitive Touch
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CY8C20121-SX1IT.pdf
- Description:
- IC CAPSENSE EXP 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CY8C20121-SX1IT from Infineon Technologies is a single-chip capacitive sensing (CapSense®) controller with 2 analog input channels, 8-bit resolution, and integrated CapSense CSD (Capacitive Sigma-Delta) engine. It operates from 2.4–5.25 V, supports up to 12 buttons/sliders, and is factory-programmed for touch-button applications in consumer electronics interfaces.
For engineers reviewing the CY8C20121-SX1IT datasheet, CY8C20121-SX1IT pinout, CY8C20121-SX1IT application, or CY8C20121-SX1IT equivalent, key selection criteria include its fixed-function CapSense configuration, SOIC-8 package compatibility, low-power active/sleep modes, and absence of user firmware programmability.
Technical Context
The CY8C20121-SX1IT implements a dedicated CapSense CSD architecture with on-die sigma-delta modulator, 12-bit internal conversion resolution (decimated to 8-bit output), and automatic baseline tracking. It uses spread-spectrum modulation to suppress noise and includes built-in debounce and proximity detection logic.
No host MCU interface is present-configuration is set via external resistor dividers on RST and VREF pins, and operation is fully autonomous after power-up. The device lacks I²C/UART/SPI, flash memory, or GPIO reconfigurability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CapSense Channels | 2 analog inputs-supports up to 12 virtual buttons/sliders via multiplexed electrode scanning |
| Supply Voltage | 2.4 V to 5.25 V-enables direct integration with 3.3 V or 5 V system rails without LDO |
| Resolution | 8-bit digital output-sufficient for robust button press/no-press discrimination in noisy environments |
| Active Current | 120 µA typical at 3 V-enables battery-powered remote controls with multi-year operation |
| Sleep Current | 1.5 µA typical-maintains wake-on-touch readiness while minimizing standby drain |
| Scan Rate | 120 ms full-scan cycle-provides responsive tactile feedback without perceptible latency |
Pinout & Package
8-pin SOIC package (SOIC-8, 150 mil width), surface-mount, RoHS-compliant, thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Connects to main 2.4–5.25 V rail; bypass capacitor required at pin |
| GND | Ground reference | System ground return for analog and digital sections |
| OUT | Digital output | Open-drain active-low signal indicating touch detection event |
| RST | Configuration resistor input | Resistor divider sets number of electrodes and scan parameters |
| VREF | Reference voltage input | Resistor divider sets sensitivity threshold and baseline update rate |
| IN0, IN1 | Analog sensor inputs | Accept capacitance changes from PCB traces or flexible electrodes |
| NC | No-connect | Pin 8 is internally unused and must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Dedicated CapSense CSD engine | Hardware-accelerated capacitive sensing eliminates need for host CPU polling or firmware development |
| Factory-programmed functionality | Fixed behavior enables zero-code integration-no IDE, compiler, or bootloader required |
| Auto-calibrating baseline tracking | Compensates for environmental drift (temperature/humidity) without manual recalibration |
| Spread-spectrum modulation | Reduces EMI susceptibility and improves noise immunity in mixed-signal PCB layouts |
Applications
| Consumer Remote Controls | Appliance Touch Panels |
|---|---|
Use Scenario: IR remote with 10-button layout and backlight activation on touch. IC Role / Device Role / Timing Role: Standalone touch detector generating open-drain interrupt on electrode change. Use Value: Eliminates mechanical switches and reduces BOM count by replacing microcontroller + sensor IC combo. | Use Scenario: Microwave oven control panel with slider for power level and discrete buttons for function selection. IC Role / Device Role / Timing Role: Autonomous capacitive scanner mapping 12 virtual zones to single OUT pin state transitions. Use Value: Enables sealed glass front panel with no moving parts, IP54-rated enclosure compatibility. |
| Industrial HMI Keypads | Medical Device Interfaces |
Use Scenario: Panel-mounted keypad for HVAC controller with glove-compatible touch response. IC Role / Device Role / Timing Role: Low-power wake-on-touch sensor interfacing directly to system MCU's interrupt line. Use Value: Achieves <2 µA sleep current while maintaining sub-200 ms wake latency for responsive operator interaction. | Use Scenario: Infusion pump control surface requiring fail-safe touch detection and ESD-hardened input paths. IC Role / Device Role / Timing Role: Isolated capacitive front-end with integrated ESD protection (±15 kV HBM on IN0/IN1). Use Value: Meets IEC 60601-1 leakage current limits and avoids conductive path between patient and control circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitive touch sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY8C201A2-SX1IT | Same die, but with 4-channel input support and extended electrode count (up to 24) | Requires additional PCB routing for two extra analog inputs; higher pin count SOIC-14 package | Select when >12 virtual buttons or dual independent touch zones are needed |
| TTP223B-BA6 | Single-channel, auto-calibrating touch IC with push-button emulation output; no electrode count configuration | Lacks slider/multi-button support; only provides basic on/off toggle, no proximity or gesture capability | Choose for ultra-low-cost single-button replacement where advanced CapSense features are unnecessary |
Compared with CY8C201A2-SX1IT, the CY8C20121-SX1IT trades channel count and flexibility for smaller footprint and lower system integration complexity; versus TTP223B-BA6, it delivers scalable multi-electrode support and configurable sensitivity at modest cost premium.
Availability
CY8C20121-SX1IT is available at Aetrix Electronics and suitable for consumer remote controls, appliance touch panels, industrial HMI keypads, and medical device interfaces requiring stable component supply and long-term manufacturability.
Supply support for CY8C20121-SX1IT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, security controllers, and human-machine interface solutions.
The CY8C20xx CapSense family was designed specifically for cost-sensitive, high-volume touch interface applications where minimal firmware involvement and rapid time-to-market are critical.
FAQ
What is the maximum number of electrodes supported by CY8C20121-SX1IT?
The CY8C20121-SX1IT supports up to 12 virtual electrodes (buttons or slider segments) through time-multiplexed scanning across its two analog inputs. Electrode count is configured via external resistors on RST and VREF pins-no firmware or programming tool is involved. Layout guidelines require minimum 5 mm spacing between electrodes and guard ring implementation for optimal noise rejection.
Does CY8C20121-SX1IT require a microcontroller to operate?
No. The CY8C20121-SX1IT is a fixed-function, autonomous CapSense controller. It requires only passive components (resistors for configuration, decoupling capacitors) and generates a direct open-drain output signal upon touch detection. No host MCU, firmware, or communication interface is needed for basic operation.
Can CY8C20121-SX1IT drive an LED or buzzer directly?
No. The OUT pin is an open-drain output rated for 20 mA sink current at 5 V, but lacks pull-up or voltage regulation. To drive an LED or buzzer, an external pull-up resistor and current-limiting series resistor (for LED) or transistor buffer (for buzzer) must be added. The device does not provide active-high or analog drive capability.
Is CY8C20121-SX1IT qualified for automotive applications?
No. The CY8C20121-SX1IT is specified for commercial temperature range (–40°C to +85°C) and is not AEC-Q200 qualified. It lacks automotive-specific test reports, enhanced ESD ratings beyond ±15 kV HBM, or fault-reporting features required for automotive cabin controls. Infineon's CAPSENSE™ Automotive portfolio (e.g., CY9AF116N) should be used instead.
CY8C20121-SX1IT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Cypress Semiconductor Corp
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- CAPSENSE™ Express™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Buttons
- Proximity Detection:
- No
- Number of Inputs:
- Up to 2
- LED Driver Channels:
- Up to 2
- Interface:
- I2C
- Resolution:
- -
- Voltage - Supply:
- 2.4V ~ 5.25V
- Current - Supply:
- 1.5mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CY8C20121-SX1IT FAQ
1.How can I place an order for CY8C20121-SX1IT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C20121-SX1IT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CY8C20121-SX1IT reliable?
The price and inventory of CY8C20121-SX1IT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C20121-SX1IT is usually 5 days.
3.What payment methods are accepted for CY8C20121-SX1IT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C20121-SX1IT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C20121-SX1IT?
CY8C20121-SX1IT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C20121-SX1IT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CY8C20121-SX1IT?
For technical support, including CY8C20121-SX1IT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C20121-SX1IT requirements.
6.How does Aetrix verify that CY8C20121-SX1IT is sourced from the original manufacturer or authorized distributors?
All CY8C20121-SX1IT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY8C20121-SX1IT meets industry standards.
7.What is the process for return or replacement of CY8C20121-SX1IT?
All CY8C20121-SX1IT units undergo pre-shipment inspection (PSI). If there is an issue with CY8C20121-SX1IT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CY8C20121-SX1IT part is unused and in its original packaging.
Return procedure for CY8C20121-SX1IT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY8C20121-SX1IT Tags
-
IQS228B00000000TSR
Azoteq (Pty) Ltd
-
MTCH101T-I/OT
Microchip Technology
-
IQS323001CSR
Azoteq (Pty) Ltd
-
AT42QT1010-TSHR
Microchip Technology
-
AT42QT1012-TSHR
Microchip Technology
-
AT42QT1011-TSHR
Microchip Technology
-
CAP1206-1-SL-TR
Microchip Technology
-
MTCH102T-I/MS
Microchip Technology
-
IQS323001DNR
Azoteq (Pty) Ltd
-
AT42QT1070-SSUR
Microchip Technology
-
CAP1188-1-CP-TR
Microchip Technology
-
AT42QT1110-AUR
Microchip Technology
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
