Infineon Technologies CY7C63231A-SXCT

Overview

CY7C63231A-SXCT from Cypress Semiconductor is a low-speed USB peripheral controller with integrated 8-bit RISC microcontroller, USB transceiver, and internal 3.3V regulator. It supports USB HID v1.1, operates at 12 MHz CPU clock, features 3 KB EPROM and 96 bytes RAM, and delivers 50 mA sink per GPIO pin-used in USB/PS/2 dual-mode human interface devices like gaming joysticks and optical mice.

For engineers reviewing the CY7C63231A-SXCT datasheet, CY7C63231A-SXCT pinout, CY7C63231A-SXCT application, or CY7C63231A-SXCT equivalent, key selection criteria include dual-mode auto-configuration (USB/PS/2), internal oscillator elimination of external crystal, 10-pin configurable GPIO, suspend-mode wake-up timer, and compliance with USB 2.0 low-speed signaling requirements.

Technical Context

This device implements a Harvard-architecture RISC core with dedicated USB Serial Interface Engine (SIE) handling enumeration, endpoint management (one control + one data endpoint), and differential D+/D− signaling. It integrates a 3.3V regulator for USB pull-up and supports automatic mode detection between USB and PS/2 without GPIO reconfiguration.

The controller uses internal clocking options-including 6-MHz ceramic resonator or internal oscillator-and includes brown-out reset (BOR), watchdog timer (WDT), and low-voltage reset (LVR) at 3.75 V. Its suspend mode enables periodic wake-up via internal timer without external components.

Key Specifications

Pinout & Package

Package: 18-pin Small Outline Integrated Circuit (SOIC), body width 3.9 mm, standard JEDEC MS-013AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C63231A-SXCT, the CY7C63231A-PC offers identical functionality in through-hole packaging but lacks exposed VREG, while AN2131QC improves suspend efficiency and interrupt handling-making it preferable for energy-constrained portable HID designs.

Availability

CY7C63231A-SXCT is available at Aetrix Electronics and suitable for gaming peripherals, optical mice, industrial keypads, and embedded HID interfaces requiring stable component supply across multi-year production cycles.

Supply support for CY7C63231A-SXCT 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 ICs for USB connectivity, programmable systems, and human interface applications.

The enCoRe™ USB product line targets cost-sensitive, space-constrained HID devices-delivering integrated USB controllers with embedded microcontrollers and regulators to eliminate external timing and power components.

FAQ

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

No. The device supports internal oscillator mode for USB operation, eliminating the need for an external crystal or resonator. A 6-MHz ceramic resonator may be used for higher accuracy, but is optional-the internal oscillator meets USB low-speed timing tolerance (±1.5%) without external components.

Can CY7C63231A-SXCT operate in PS/2 mode without firmware changes?

Yes. Hardware-level auto-detection enables seamless PS/2 or USB mode selection at power-up based on host handshake signals-no firmware intervention or GPIO configuration is required to switch protocols.

What is the maximum sink current per GPIO pin on CY7C63231A-SXCT?

Each GPIO pin supports up to 50 mA sink current. This allows direct driving of LEDs, small relays, or optocouplers without external driver transistors-verified under DC characteristics testing at VDD = 5.0 V and TA = 25 °C.

Is the VREG pin intended for powering external circuitry?

No. VREG provides a dedicated 3.3V output solely for the USB D+ pull-up resistor. It is not rated for external loads beyond 100 µA and must not be used as a general-purpose supply rail-doing so risks USB enumeration failure or regulator instability.