CY8C3666AXI-036 - 67MHz PSoC 3 MCU with 64KB Flash | Infineon
MPN: CY8C3666AXI-036 ✓ ActiveCY8C3666AXI-036 Overview
A PSoC, or programmable system-on-chip, is a mixed-signal microcontroller architecture that combines a CPU, programmable digital blocks, programmable analog blocks, memory, and configurable I/O in one integrated device. In the broader semiconductor hierarchy, the CY8C3666 belongs to the PSoC family, which is part of the 8-bit microcontroller and embedded-processing market. Its configurable architecture allows functions to be adapted at design time while reducing the need for separate discrete peripheral devices.
The manufacturer lists 64 kByte of flash for firmware storage and 8 kByte of SRAM for working data. Its operating frequency reaches 67 MHz, providing additional execution headroom for interrupt handling, serial communications, control logic, and mixed-signal functions. A distributor description identifies USB and serial connectivity, timer and PWM control, and configurable analog and digital resources as important features of the CY8C3666 family.
The 100-lead TQFP package exposes the device's extensive mixed-signal and digital resources in a surface-mount format measuring 14 mm by 14 mm. A 100-pin footprint also provides substantial routing flexibility, although it requires careful PCB layout and a larger board area than compact 16-pin or 32-pin microcontrollers. Design engineers should assign pins according to the manufacturer pin-description table rather than inferring functions from the package position alone.
Typical uses include USB-connected embedded controls, serial-interface data acquisition equipment, timer-based motor and pump controls, PWM-driven actuator systems, and mixed-signal products requiring programmable analog and digital functions. The same PSoC 3 architecture can consolidate a small control system onto one device when the design benefits from configurable peripherals and deterministic embedded control.
When planning a PCB, reserve all 100 package positions even if the initial product uses only a subset of the device functions. Follow the manufacturer reference schematic and pin-description table for decoupling, analog routing, and unused-pin treatment. Firmware selection must also match the exact CY8C3666 device configuration, flash size, SRAM size, package, and ordering code.
This product record combines the exact manufacturer and distributor parameters for the CY8C3666AXI-036 with engineering guidance on package implementation, application fit, verified drop-in replacement constraints, and design decision trade-offs. It emphasizes using the exact device characterization and manufacturer pin definitions during schematic capture, PCB layout, firmware configuration, and production sourcing.
Drop-in alternatives for CY8C3666AXI-036 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with CY8C3666AXI-036 (same form factor and footprint) — differing in Flash Memory, Package, Product Type.
No drop-in alternatives available for this product.
Request AlternativesCY8C3666AXI-036 Maximum Ratings & Electrical Characteristics
| Product Type | PSoC 3 programmable system-on-chip microcontroller |
| CPU Architecture | 8-bit 8051 |
| Maximum CPU Frequency | 67 MHz |
| Flash Memory | 64 kByte (64K x 8 bits) |
| SRAM | 8 kByte |
| Supply Voltage Range | 0.5 V to 5.5 V |
| Package | 100-lead TQFP (14 mm x 14 mm) |
| Mounting Type | Surface mount |
| Programmable Architecture | Configurable digital and analog peripheral blocks |
| Connectivity | USB and serial connectivity |
| Control Peripherals | Timer and PWM control |
| Series | CY8C36xx |
| Silicon Family | PSoC 3 |
| Ordering Variant | CY8C3666AXI-036 tray configuration |
| Pin Count | 100 pins |
CY8C3666AXI-036 100-lead tqfp (14 mm x 14 mm) Pin Configuration Guide
Pin configuration for CY8C3666AXI-036 (100-lead tqfp (14 mm x 14 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for CY8C3666AXI-036.
Refer to the datasheet for full pin configuration.
Typical Applications
CY8C3666AXI-036 is suitable for 6 applications: USB-Connected Embedded Control, Serial Data-Acquisition Equipment, Timer and PWM Motor Control, Pump and Valve Control, LED Lighting and Dimming, Configurable Mixed-Signal Product.
USB-Connected Embedded Control
The CY8C3666AXI-036 fits USB-connected controls because it combines a 67 MHz 8-bit 8051 CPU with USB connectivity in a programmable PSoC architecture. Its 64 kByte flash provides room for application firmware, USB routines, configuration data, and update logic, while 8 kByte of SRAM supports working state and communication buffers. The configurable digital and analog blocks can also consolidate input conditioning, status indication, and control functions around the processor. Implementation should follow the manufacturer USB signal, clock, decoupling, and reference-design guidance, with the 100-TQFP land pattern placed to preserve USB signal integrity.
Recommended
Serial Data-Acquisition Equipment
The CY8C3666AXI-036 is suitable for serial data-acquisition equipment that must coordinate sampling, conditioning, data formatting, and host communication. Its 67 MHz 8051 processing core provides timing headroom, while the PSoC 3 programmable architecture allows digital logic and analog functions to be adapted to the selected sensor and interface requirements. The 64 kByte flash can hold acquisition firmware and calibration tables, and the 8 kByte SRAM can support buffers. Engineers should partition serial traffic from sensitive analog paths and use the manufacturer pin-description and reference-circuit guidance when assigning multiplexing, clock, and peripheral functions.
Recommended
Timer and PWM Motor Control
The CY8C3666AXI-036 supports timer and PWM control applications where timing accuracy, programmable logic, and mixed-signal functions are needed in a single microcontroller. Its 67 MHz 8051 core can supervise timers, process feedback, and coordinate actuator outputs, while configurable digital blocks can simplify specialized sequencing logic. The 64 kByte flash accommodates motion algorithms, operating tables, and diagnostics, and 8 kByte of SRAM supports control state. Designers must calculate timing from the configured clock and verify every PWM and timer connection against the manufacturer pin table before placing the controller.
Recommended
Pump and Valve Control
The CY8C3666AXI-036 can serve as the controller in pumps, valves, and compact fluid systems where timed outputs, sensor inputs, and status reporting must operate together. Its timer and PWM resources suit drive and monitoring functions, while programmable analog and digital blocks can implement application-specific input conditioning and interlocks. The 67 MHz processor rate leaves room for supervisory logic beyond the timing peripherals, and 64 kByte of flash stores control sequences. For safety-relevant behavior, keep protective interlocks in appropriately rated hardware and use the MCU for monitoring and optimization rather than sole safety certification.
Recommended
LED Lighting and Dimming
The CY8C3666AXI-036 fits programmable LED lighting systems that require multiple timing channels, user controls, sensor inputs, and coordinated outputs. Its timer and PWM capabilities support dimming and sequencing, while the PSoC 3 configurable architecture can simplify current-control loops, fault detection, and communication among lighting modules. The 67 MHz 8051 core can manage effects and diagnostics, with 64 kByte of flash reserved for lighting tables and 8 kByte of SRAM for live state. The analog and digital assignments must follow the manufacturer configuration, and power-stage current limits should be established independently from the logic controller.
Recommended
Configurable Mixed-Signal Product
The CY8C3666AXI-036 is appropriate for mixed-signal products in which fixed peripherals would force excess components or an inefficient board partition. PSoC 3 combines an 8051 CPU with configurable digital and analog blocks, allowing designers to implement specialized routing, control, measurement, and interface functions in one device. Its 64 kByte flash supports application firmware, while 8 kByte of SRAM accommodates runtime data. The 100-lead TQFP exposes extensive resources but also demands disciplined pin planning. Use the manufacturer configuration tables and package drawing to validate availability, voltage domains, and routing before schematic approval.
Recommended
Engineering reference data for CY8C3666AXI-036 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Manufacturer | Infineon Technologies |
| Package | 100-lead TQFP (14 mm x 14 mm) |
| CPU Architecture | 8-bit 8051 |
| Maximum Frequency | 67 MHz |
| Flash Memory | 64 kByte |
| SRAM | 8 kByte |
| Supply Voltage Range | 0.5 V to 5.5 V |
| Connectivity | USB and serial connectivity |
| Control Peripherals | Timer and PWM control |
| Programmable Architecture | Configurable digital and analog peripheral blocks |
Key Differentiators
- Combines programmable mixed-signal resources with an 8051 control core (vs CY8C3666AXI-036T)
- Provides substantial firmware and working-memory capacity for an 8-bit PSoC (vs Small fixed-function 8-bit microcontroller)
- Integrates USB and serial connectivity with configurable control resources (vs Conventional 8051 microcontroller without programmable peripherals)
Design Notes
Use the manufacturer TQFP-100 land pattern and preserve the documented pin-1 orientation. The 100-lead package has a substantial pin count, so schematic review should verify every power, ground, clock, programming, communications, analog, and programmable-function assignment before layout release. Keep the footprint dimensions and paste mask derived from the official package drawing rather than relying on a generic 100-pin library.
Separate analog and digital return paths as far as the selected PSoC configuration permits, and follow the manufacturer reference schematic for decoupling and analog grounding. USB and serial interfaces should use short, controlled routes with return paths referenced to the appropriate ground plane. Programmable-block assignments determine which pins become sensitive signal inputs, so finalize the device configuration before locking the analog and communication layout.
Do not treat every CY8C3666 ordering code as an electrical substitute. Confirm the exact suffix, package, temperature grade, flash size, SRAM size, clock configuration, and pin table before substitution, and confirm that the programming project targets the same device variant. Also avoid assuming that USB, serial, timer, PWM, or analog resources are simultaneously available; the configurable architecture requires validation against the selected peripheral allocation.
Apply the manufacturer's decoupling and power-distribution recommendations to every required supply domain. The listed 0.5 V to 5.5 V operating range does not mean that every supply pin may simultaneously tolerate 5.5 V. Use the manufacturer pin descriptions to distinguish core, analog, and digital supply requirements, and confirm permitted voltage relationships and power-up conditions before applying power to prototype hardware.
Compliance Information
No specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements were included with the manufacturer and distributor product information. These statuses remain unknown pending confirmation from the manufacturer product documentation or customer-specific procurement records.
