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Infineon Technologies CY8C9520A-24PVXIT
- Part No.:
- CY8C9520A-24PVXIT
- Manufacturer:
- Infineon Technologies
- Category:
- I/O Expanders
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
CY8C9520A-24PVXIT.pdf
- Description:
- IC XPNDR 100KHZ I2C 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:19,003
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Product details
Overview
CY8C9520A-24PVXIT from Cypress Semiconductor is a 20-bit I/O expander IC with integrated EEPROM and 4 independent 8-bit PWM channels, operating as dual I²C slave devices (I/O expander + serial EEPROM). It supports configurable drive modes per pin (strong drive, open-drain, pull-up/down, high-Z), interrupt-on-change signaling via dedicated INT pin, and EEPROM write disable via WD input. Used in embedded control systems for LED dimming, sensor interface expansion, and board-level configuration storage.
For engineers reviewing the CY8C9520A-24PVXIT datasheet, CY8C9520A-24PVXIT pinout, CY8C9520A-24PVXIT application, or CY8C9520A-24PVXIT equivalent, key selection factors include I²C address flexibility (A0–A6), EEPROM size (3 KB user-accessible + dedicated defaults area), PWM clock source options (six internal clocks), and per-pin drive mode configurability - all critical for resource-constrained microcontroller interfaces.
Technical Context
The device implements two logically separate I²C peripherals sharing one physical bus: a multi-port I/O expander (7-bit address 0x40–0x4F or 0xA0–0xAF) and a serial EEPROM (7-bit address 0x50–0x5F). Address resolution uses Extendable Soft Addressing, where unused A1–A6 pins become GPIOs.
Each of the 20 I/O pins maps to GPort0 (8-bit), GPort1 (5-bit), and GPort2 (up to 4-bit, configurable as A1–A6/WD), with independent Port Direction, Drive Mode, Inversion, and Interrupt Mask registers. PWM outputs (PWM0–PWM3) support 8-bit resolution, programmable period/pulse width, and selectable clock sources (1.5 MHz, 93.75 kHz, 32 kHz, 24 MHz, or dividers).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I/O Count | 20 bidirectional pins across GPort0–GPort2; enables compact system-level GPIO expansion without MCU pin exhaustion. |
| PWM Channels | 4 × 8-bit PWM outputs (PWM0–PWM3); supports LED dimming, motor control, or analog voltage generation via filtering. |
| EEPROM Size | 3 KB user-accessible + dedicated defaults area; stores factory/user port configurations, restoring them automatically at power-on reset. |
| I²C Interface | Two-device addressing (0x40–0xAF & 0x50–0x5F); requires master support for clock stretching during EEPROM writes. |
| Drive Modes | 7 per-pin modes: strong drive (10 mA source / 25 mA sink), open-drain, pull-up/down, high-Z; eliminates need for external biasing components. |
| Interrupt Output | Dedicated active-low INT pin signals input level changes or PWM state transitions; reduces polling overhead in host firmware. |
Pinout & Package
Package: 28-pin SSOP (24-Pin variant not applicable; CY8C9520A-24PVXIT is 28-pin SSOP, 5.6 mm × 10.2 mm, 0.635 mm pitch). Pin count and layout match standard 28-SSOP footprint with thermal pad omitted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vdd | Power supply | 3.3 V ±10% main supply; powers logic, I/O, and internal regulators. |
| Vss | GND | Digital ground reference for all I/O and internal circuitry. |
| SCL | I²C clock input | Open-drain input synchronized to master clock; requires external pull-up. |
| SDA | I²C data I/O | Open-drain bidirectional data line; requires external pull-up. |
| INT | Interrupt output | Active-low open-drain signal indicating input change or PWM event; connects directly to MCU interrupt pin. |
| WD | EEPROM write disable | Active-high input blocking all EEPROM writes when asserted; enables hardware-level write protection. |
| A0 | Fixed address bit | LSB of I²C address; sets base address (0x40/0x50 or 0x48/0x58 depending on R/W bit). |
| GPort0_Bit0–Bit7 | GPIO/PWM channel | 8-bit port with individual direction, drive mode, and inversion control; Bit0 also serves as PWM3 output. |
| GPort1_Bit0–Bit4 | GPIO/PWM channel | 5-bit port; pins may be reassigned as A1–A3 or WD depending on configuration register settings. |
| GPort2_Bit0–Bit2 | GPIO/PWM channel | 3-bit port; pins may be reassigned as A4–A6 depending on configuration register settings. |
Key Features
| Feature | Design Value |
|---|---|
| Extendable Soft Addressing | Supports up to 128 devices on one I²C bus using A0–A6; unused address pins auto-reconfigure as GPIOs, maximizing pin utility. |
| User Default Storage | EEPROM-resident port/PWM defaults loaded automatically at POR; eliminates boot-time initialization code in host firmware. |
| Per-Pin Drive Mode Control | Seven selectable modes per I/O pin (e.g., strong drive, open-drain, pull-up/down); removes need for discrete biasing resistors or level shifters. |
| Configurable PWM Clock Sources | Six internal clock options (1.5 MHz to 32 kHz) with programmable dividers; enables precise timing control across diverse load requirements. |
| Interrupt-on-Change Logic | Individual maskable status bits per input pin; INT pin asserts only on unmasked transitions, minimizing spurious interrupts. |
Applications
| LED Dimming Control | Industrial Sensor Interface Expansion |
|---|---|
Use Scenario: Driving multiple LEDs in HVAC control panels or medical device status indicators with smooth brightness control. IC Role / Device Role / Timing Role: I/O expander providing 4 dedicated PWM outputs (PWM0–PWM3) with 8-bit resolution and independent period/pulse width registers. Use Value: Eliminates need for external PWM generators; reduces BOM count and PCB area while enabling synchronized dimming across 4 LED strings. | Use Scenario: Adding digital input capability for temperature, pressure, or door-switch sensors on legacy industrial controllers with limited GPIO. IC Role / Device Role / Timing Role: Configurable 20-bit GPIO expander with interrupt-on-change detection and internal pull-ups, connected via existing I²C bus. Use Value: Enables real-time edge detection without host polling; reduces CPU load and improves system responsiveness to safety-critical events. |
| Embedded Configuration Storage | Board-Level Manufacturing Data Logging |
Use Scenario: Storing calibrated sensor offsets, trim values, or operational thresholds in field-deployed IoT gateways. IC Role / Device Role / Timing Role: On-chip 3 KB EEPROM with byte-write capability and hardware write-disable (WD pin) for secure parameter retention. Use Value: Provides nonvolatile storage independent of host MCU flash; prevents accidental overwrites during firmware updates via hardware-level protection. | Use Scenario: Recording production test results, serial numbers, or calibration timestamps during PCBA manufacturing. IC Role / Device Role / Timing Role: Dedicated EEPROM section for user defaults and diagnostic data, accessible via standard I²C read/write commands. Use Value: Enables traceability without adding discrete EEPROM; simplifies test fixture integration and supports post-production failure analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I/O expansion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCA6424A | 24-bit I/O expander with 3.3 V operation, no integrated PWM or EEPROM; supports interrupt masking but lacks default restore capability. | Lacks on-chip PWM and EEPROM; requires external components for dimming or configuration persistence. | Select when only basic GPIO expansion is needed and system already includes separate PWM/EEPROM resources. |
| PCA9555 | 16-bit I/O expander with 3.3 V/5 V tolerant I/O, no PWM, no EEPROM; supports polarity inversion and interrupt output. | No PWM generation or nonvolatile configuration storage; relies entirely on host MCU for state management. | Choose for cost-sensitive designs where I²C address space is constrained and PWM/EEPROM are handled elsewhere. |
Compared with TCA6424A and PCA9555, CY8C9520A-24PVXIT integrates PWM generation and EEPROM-based default restoration - reducing component count and firmware complexity in applications requiring autonomous I/O behavior after power cycle.
Availability
CY8C9520A-24PVXIT is available at Aetrix Electronics and suitable for industrial HMI panels, medical device status interfaces, and IoT gateway peripheral expansion requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for CY8C9520A-24PVXIT 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
Cypress Semiconductor (now part of Infineon Technologies) designs programmable silicon solutions for embedded systems, focusing on PSoC architecture, USB, memory, and mixed-signal ICs.
The CY8C95xxA family targets I²C-based peripheral expansion in space-constrained embedded systems, delivering integrated GPIO, PWM, and EEPROM to reduce host MCU I/O burden and simplify board-level configuration management.
FAQ
Does CY8C9520A-24PVXIT support 5 V I²C buses?
No. The device operates exclusively at 3.3 V (Vdd = 3.0–3.6 V) and is not 5 V tolerant on SCL/SDA pins. Connecting to a 5 V I²C bus without level translation risks permanent damage. External bidirectional level shifters (e.g., TXS0102) are required for interoperability with 5 V masters.
Can the WD pin be left unconnected?
No. The WD pin must be actively driven high (to Vdd) to disable EEPROM writes or low (to Vss) to enable them. Leaving it floating violates the Absolute Maximum Ratings and may cause unpredictable write behavior or latch-up. A 10 kΩ pull-down resistor is recommended if write-enable is desired by default.
How many I²C addresses does CY8C9520A-24PVXIT occupy?
It occupies two distinct 7-bit I²C addresses: one for the I/O expander (default 0x40, configurable via A0–A6) and another for the EEPROM (default 0x50, same address bits). Both share the same physical pins but respond only to their respective address prefixes (0x4x vs 0x5x), enabling simultaneous access without conflict.
Is the internal watchdog timer usable independently of the I/O expander functions?
Yes. The watchdog timer is controlled via the Watchdog Register (2Fh) and operates independently of I/O or PWM configuration. It can be enabled/disabled, configured with timeout periods (16 ms to 2 s), and cleared via I²C command - making it suitable as a system-level safety monitor even when GPIOs are unused.
CY8C9520A-24PVXIT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of I/O:
- 20
- Interface:
- I2C
- Interrupt Output:
- Yes
- Features:
- EEPROM, POR, PWM, WDT
- Output Type:
- Open Drain
- Current - Output Source/Sink:
- 10mA, 25mA
- Clock Frequency:
- 100 kHz
- Voltage - Supply:
- 3V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
CY8C9520A-24PVXIT FAQ
1.How can I place an order for CY8C9520A-24PVXIT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY8C9520A-24PVXIT 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 CY8C9520A-24PVXIT reliable?
The price and inventory of CY8C9520A-24PVXIT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY8C9520A-24PVXIT is usually 5 days.
3.What payment methods are accepted for CY8C9520A-24PVXIT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY8C9520A-24PVXIT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY8C9520A-24PVXIT?
CY8C9520A-24PVXIT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY8C9520A-24PVXIT 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 CY8C9520A-24PVXIT?
For technical support, including CY8C9520A-24PVXIT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY8C9520A-24PVXIT requirements.
6.How does Aetrix verify that CY8C9520A-24PVXIT is sourced from the original manufacturer or authorized distributors?
All CY8C9520A-24PVXIT 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 CY8C9520A-24PVXIT meets industry standards.
7.What is the process for return or replacement of CY8C9520A-24PVXIT?
All CY8C9520A-24PVXIT units undergo pre-shipment inspection (PSI). If there is an issue with CY8C9520A-24PVXIT, 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 CY8C9520A-24PVXIT part is unused and in its original packaging.
Return procedure for CY8C9520A-24PVXIT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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