Infineon Technologies CY8C3665LTI-001

Overview

CY8C3665LTI-001 from Infineon Technologies (acquired Cypress Semiconductor) is a programmable system-on-chip (PSoC® 3) integrating an 8051 CPU core, 64 KB flash, 8 KB SRAM, 2 KB EEPROM, and configurable analog/digital peripherals including a 12-bit delta-sigma ADC, four opamps, four comparators, four DACs, CAN 2.0b interface, and full-speed USB 2.0. It operates from 0.5 V to 5.5 V and supports industrial temperature range (–40 °C to +85 °C) in a 48-pin SSOP package. Used in embedded sensor fusion, motor control, and industrial HMI systems.

For engineers reviewing the CY8C3665LTI-001 datasheet, CY8C3665LTI-001 pinout, CY8C3665LTI-001 application, or CY8C3665LTI-001 equivalent, key selection criteria include its integrated CAN/USB dual-interface capability, on-die 1.024 V ±0.1% voltage reference, 67-MHz DFB for real-time FIR/IIR filtering, CapSense®-enabled GPIO routing, and ultra-low-power hibernate mode (200 nA with RAM retention).

Technical Context

The CY8C3665LTI-001 implements a single-cycle 8051 CPU core running up to 67 MHz via internal PLL, with 24-channel DMA supporting chained descriptors and multilayer AHB bus access. Its digital subsystem centers on 24 universal digital blocks (UDBs), each combining PLD logic and state machines to implement custom peripherals like UART, SPI, LIN, PRS, or quadrature decoders without firmware overhead.

Analog functionality is anchored by a 12-bit delta-sigma ADC (192 kSPS, 66 dB SINAD, ±1 LSB INL/DNL), four rail-to-rail opamps (25 mA drive), four comparators (95 ns response), and four SC/CT configurable analog blocks usable as PGA, TIA, mixer, or sample-and-hold - all routed through a shared analog interconnect accessible from any of 62 GPIO pins.

Key Specifications

Pinout & Package

Package: 48-pin SSOP (Small Outline Integrated Circuit), 0.635 mm pitch, body size 15.4 mm × 7.5 mm, JEDEC MS-012AC compliant. RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable SoC applications.

Compared with STM32F303RET6 and MAX32660, the CY8C3665LTI-001 uniquely combines CAN+USB dual connectivity, hardware-accelerated analog signal processing (DFB + delta-sigma ADC), and CapSense® in a single die - reducing system-level component count and firmware complexity for mixed-signal edge controllers.

Availability

CY8C3665LTI-001 is available at Aetrix Electronics and suitable for industrial motor control, portable medical devices, smart building HMIs, and automotive body electronics requiring stable component supply across extended product lifecycles.

Supply support for CY8C3665LTI-001 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

Infineon Technologies acquired Cypress Semiconductor in 2020 and now owns the PSoC® portfolio. Cypress pioneered configurable mixed-signal SoCs with emphasis on analog flexibility, low-power design, and rapid prototyping.

The CY8C36 family targets cost-sensitive, high-integration embedded applications demanding both precision analog acquisition and real-time digital control - especially where last-minute feature changes are expected and firmware-only updates suffice.

FAQ

Does CY8C3665LTI-001 support USB device enumeration without external crystal?

Yes. The part integrates a full-speed USB 2.0 PHY and can achieve USB device enumeration using its internal IMO (internal main oscillator) calibrated to ±0.25% accuracy across voltage and temperature - eliminating the need for an external 12-MHz crystal in most HID and CDC applications.

What is the maximum number of simultaneous analog inputs supported?

The CY8C3665LTI-001 supports up to 62 analog inputs via its GPIO pins, all routable to the delta-sigma ADC or analog muxes. With the 12-bit ADC operating at 192 kSPS, it can scan 16 channels at >12 kSPS per channel while maintaining 66 dB SINAD performance.

Can the DFB perform real-time FFT operations?

No. The DFB is optimized for FIR and IIR filtering, not FFT computation. It lacks complex arithmetic units and butterfly addressing; however, it can implement Goertzel algorithm sections for tone detection or pre-filtering stages upstream of FFT execution on the 8051 core.

Is CAN communication functional in low-power sleep mode?

No. CAN bus activity requires the CPU and CAN peripheral clock domains to be active. While the device supports wake-on-CAN interrupt, full CAN frame reception/transmission is disabled in sleep or hibernate modes - only wake events are processed.