Infineon Technologies CY7C63231A-PXC

Overview

CY7C63231A-PXC 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, features 3 KB EPROM, 96 bytes RAM, 10 configurable GPIO pins (50 mA sink), and internal 3.3 V regulator for USB pull-up - used in HID devices such as optical mice and gamepads.

For engineers reviewing the CY7C63231A-PXC datasheet, CY7C63231A-PXC pinout, CY7C63231A-PXC application, or CY7C63231A-PXC equivalent, key selection criteria include dual-mode USB/PS/2 auto-configuration, internal oscillator elimination of external crystal, GPIO drive strength, suspend-mode wake-up timer, and compliance with USB 2.0 and HID 1.1 specifications.

Technical Context

This device implements a Harvard-architecture 8-bit RISC core with dedicated USB Serial Interface Engine (SIE) supporting low-speed (1.5 Mbps) USB communication. It integrates a programmable 12-bit free-running timer, watchdog timer, and low-voltage reset (3.75 V) with brown-out detection during suspend mode.

The USB SIE handles enumeration, endpoint management (one control + one data endpoint), and differential signaling via integrated transceiver. PS/2 mode is selected automatically without GPIO intervention, and the internal 3.3 V regulator powers the D+ pull-up resistor - eliminating external LDO or resistor networks.

Key Specifications

Pinout & Package

Package: 18-pin SOIC (Small Outline Integrated Circuit), body width 3.9 mm, lead pitch 1.27 mm - RoHS-compliant surface-mount package suitable for automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C63231A-PXC, the -PC variant trades surface-mount efficiency for through-hole compatibility, while the CY7C63221A-PXC offers fixed HID firmware - making the -PXC optimal for custom HID devices requiring full firmware control and SOIC assembly.

Availability

CY7C63231A-PXC is available at Aetrix Electronics and suitable for optical mouse design, industrial keypad interfaces, POS terminal peripherals, and USB gamepad development requiring stable component supply and long-term industrial availability.

Supply support for CY7C63231A-PXC 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 logic, and embedded control - headquartered in San Jose, CA.

The enCoRe™ USB product line targets cost-sensitive human interface devices, emphasizing integration of USB/PS/2 protocol engines, microcontroller, and power regulation in single-chip solutions.

FAQ

Does CY7C63231A-PXC require an external crystal?

No. The device supports internal 6 MHz oscillator mode, eliminating need for external crystal or resonator. External 6 MHz ceramic resonator is optional and used only when higher timing accuracy is required. Internal oscillator enables faster wake-up from suspend mode and reduces BOM count by one component.

Can CY7C63231A-PXC operate in both USB and PS/2 modes simultaneously?

No. It operates in either USB or PS/2 mode, but auto-detects and configures the active interface at power-up or reset without software or hardware intervention. Mode selection is determined by host handshake - no GPIO pin or external switch is needed to toggle between protocols.

What is the maximum current drive capability per GPIO pin?

Each GPIO pin supports up to 50 mA sink current. This allows direct driving of LEDs, small solenoids, or optocoupler inputs without external driver transistors. Source current is limited to 5 mA, so high-side switching requires external components.

Is the 3 KB EPROM field-programmable?

Yes. The 3 KB EPROM is electrically programmable using standard industry programmers supporting Cypress's programming protocol. It retains firmware across power cycles and supports in-system programming via dedicated programming pins (VPP, P0.0, P0.1) with appropriate voltage sequencing.