Infineon Technologies CY7C63101A-QC

Overview

CY7C63101A-QC from Cypress Semiconductor is an 8-bit RISC OTP microcontroller with integrated low-speed USB 1.1 transceiver, 4 KB EPROM, 128-byte RAM, and 16 GPIOs (8 low-current P0 + 8 high-current P1), optimized for human-interface devices including optical mice and gamepads operating at 1.5 Mbps.

For engineers reviewing the CY7C63101A-QC datasheet, CY7C63101A-QC pinout, CY7C63101A-QC application, or CY7C63101A-QC equivalent, key selection criteria include USB endpoint count (2), internal clock doubling (6 MHz → 12 MHz), Schmitt-trigger I/O with programmable sink current, suspend/wake-up via CEXT, and QSOP-24 package compatibility.

Technical Context

The CY7C63101A integrates a USB Serial Interface Engine (SIE) compliant with USB 1.1 low-speed specification (1.5 Mbps), supporting exactly one device address and two endpoints: control (EP0) and data (EP1), each with dedicated 8-byte FIFOs in shared 128-byte RAM. The Harvard architecture executes 35 USB-optimized instructions.

It uses a 6-MHz ceramic resonator (XTALIN/XTALOUT), internally doubled to 12 MHz for core operation; features maskable edge-triggered interrupts on all 16 GPIOs; and implements Instant-On Now™ suspend mode with wake-up via USB activity, GPIO edge, or CEXT RC timer - all controlled by Status and Control Register (0xFF).

Key Specifications

Pinout & Package

Package: 24-pin QSOP (Quad Small Outline Package), 300 mil body width, gull-wing leads, JEDEC MS-013AC compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB HID microcontroller applications.

Compared with AN10832 and FT900, the CY7C63101A-QC delivers lowest system cost and fastest time-to-market for certified low-speed USB HID devices by integrating SIE, transceiver, clock doubler, and suspend/wake logic in a single OTP chip - eliminating external components and complex USB stack porting.

Availability

CY7C63101A-QC is available at Aetrix Electronics and suitable for optical mouse design, USB gamepad production, and industrial HID configurator development requiring stable component supply across extended product lifecycles.

Supply support for CY7C63101A-QC 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, memory, and programmable systems, emphasizing integration, low power, and ease of use for embedded peripherals.

The CY7C63xxA product line was engineered specifically for cost-sensitive, low-speed USB human-interface devices - delivering full USB compliance with minimal external components and zero USB stack licensing.

FAQ

Is CY7C63101A-QC compatible with USB 2.0 hosts?

Yes - it operates exclusively in USB 1.1 low-speed mode (1.5 Mbps) and is fully backward-compatible with all USB 2.0 and USB 3.x hosts via their built-in low-speed support. No driver changes or OS updates are required; it enumerates as a standard HID-class device using Microsoft-provided inbox drivers.

What is the role of the CEXT pin in suspend/wake functionality?

CEXT is an open-drain output with Schmitt-trigger input used to connect an external RC network. During suspend, the internal capacitor charges; when voltage crosses the Schmitt threshold, it triggers a wake-up interrupt. This enables precise, software-configurable wake-up timing without external timers or microcontrollers.

Can P0 and P1 pins be used simultaneously for different functions?

Yes - P0 pins (low-current, Schmitt-trigger) are optimized for sensor interfacing and noise-immune digital inputs, while P1 pins (high-current) drive LEDs, buzzers, or small motors. Both ports support independent interrupt enable, pull-up control, and sink-current programming - enabling mixed-signal peripheral designs in one chip.

Does CY7C63101A-QC require external USB termination resistors?

No - the internal USB transceiver includes matched 1.5-kΩ pull-up on D+ (for low-speed device ID) and on-chip termination for D+/D– lines. Only a single external 1.5-kΩ resistor from D+ to VCC is required for USB enumeration; no series resistors or TVS diodes are mandated for basic compliance.