Infineon Technologies CY7C63231A-SC

Overview

CY7C63231A-SC from Cypress Semiconductor is a low-speed USB peripheral controller with integrated 8-bit RISC microcontroller, USB transceiver, and PS/2 dual-mode capability. It operates at 12 MHz CPU clock, includes 3 KB EPROM and 96 bytes RAM, supports one control + one data endpoint, and delivers 50 mA sink per GPIO pin - used in USB/PS/2 combo devices like optical mice and gamepads.

For engineers reviewing the CY7C63231A-SC datasheet, CY7C63231A-SC pinout, CY7C63231A-SC application, or CY7C63231A-SC equivalent, key selection criteria include dual-mode auto-configuration, internal 3.3 V regulator for USB pull-up, suspend-mode wake-up timer, 4.0–5.5 V operation, and 10-pin configurable GPIO without external mode-switching components.

Technical Context

This device implements a Harvard-architecture 8-bit RISC core with dedicated USB Serial Interface Engine (SIE) supporting Low-Speed USB 2.0 and HID 1.1 compliance. It integrates a 12-MHz internal CPU clock derived from either internal oscillator or 6-MHz external ceramic resonator.

The SIE handles enumeration, endpoint management (EP0 control + EP1 data), and differential D+/D− signaling with internal 3.3 V regulator driving the USB pull-up resistor. GPIO pins support maskable interrupts, open-drain/CMOS output modes, and can be repurposed as XTALIN/XTALOUT/VREG inputs during operation.

Key Specifications

Pinout & Package

Package: 18-pin SOIC (Small Outline Integrated Circuit), leaded, surface-mount, JEDEC MS-013AC compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-speed USB peripheral controller applications.

Compared with CY7C63230A-SC, the CY7C63231A-SC adds essential PS/2 auto-detection and dual-mode flexibility; versus FT230X, it provides full embedded HID processing without host-side driver customization or external MCU dependency.

Availability

CY7C63231A-SC is available at Aetrix Electronics and suitable for optical mice, gamepads, and industrial HMI panels requiring stable component supply, long-lifecycle support, and dual-interface compatibility.

Supply support for CY7C63231A-SC 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 mixed-signal and programmable system-on-chip solutions for USB, memory, and embedded control applications.

The enCoRe™ USB product line targets cost-sensitive human-interface devices requiring integrated USB/PS/2 peripheral control, minimal external components, and rapid time-to-market for HID-class peripherals.

FAQ

Does CY7C63231A-SC require an external crystal for USB operation?

No. The device includes an internal oscillator that meets USB Low-Speed timing requirements. A 6 MHz ceramic resonator may be used for improved accuracy, but is optional. The internal oscillator eliminates need for external crystal or resonator in most HID applications.

Can all GPIO pins drive LEDs directly?

Yes. Each GPIO pin supports up to 50 mA sink current, sufficient to drive standard indicator LEDs without external current-limiting transistors. Output mode (CMOS, open-drain, pull-up) and drive strength are software-configurable per pin.

How does PS/2 and USB mode auto-configuration work?

At power-up or reset, the device detects bus signaling characteristics: presence of USB SE0/idle state or PS/2 clock/data handshake. No firmware or GPIO configuration is needed - hardware-level detection routes signals to appropriate protocol engine automatically.

Is the internal 3.3 V regulator usable for external circuitry?

No. The VREG output is designed solely to bias the internal 1.5 kΩ USB pull-up resistor on D+. Its load regulation and current capacity (≤1 mA) are insufficient for powering external logic or peripherals; it must not be loaded beyond its specified function.