Infineon Technologies CY8C3665LTI-002

Overview

CY8C3665LTI-002 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, and full CAN 2.0b interface - used in industrial sensor hubs requiring mixed-signal processing, real-time control, and fieldbus connectivity.

For engineers reviewing the CY8C3665LTI-002 datasheet, CY8C3665LTI-002 pinout, CY8C3665LTI-002 application, or CY8C3665LTI-002 equivalent, key selection criteria include its 67-MHz CPU clock, –40 °C to +85 °C industrial temperature rating, 48-pin SSOP package, CAN 2.0b compliance, and CapSense®-enabled GPIO routing for touch-integrated embedded control systems.

Technical Context

The CY8C3665LTI-002 implements a single-cycle 8051 microcontroller core with multiply/divide instructions, supported by a multilayer AHB bus architecture enabling concurrent DMA transfers across digital and analog subsystems. Its programmable analog subsystem centers on a 12-bit delta-sigma ADC with ±1 LSB INL/DNL, 66-dB SINAD, and programmable gain (×0.25 to ×16), directly feeding a 24-bit DFB for FIR/IIR filtering without CPU intervention.

Digital flexibility derives from 24 universal digital blocks (UDBs) implementing logic, timers, PWMs, UART/I2C/SPI, and full CAN 2.0b with 16 Rx/8 Tx buffers. Clocking includes a 3–62 MHz internal oscillator, 4–33 MHz crystal oscillator, and PLL up to 67 MHz - all supporting deterministic timing for real-time sensor acquisition and CAN message scheduling.

Key Specifications

Pinout & Package

48-pin SSOP (Shrink Small Outline Package) with 0.635 mm pitch, JEDEC MS-012AC compliant, body size 7.5 mm × 10.3 mm, 1.75 mm max height. Thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable mixed-signal controller applications.

Compared with STM32F303VCT6 and MAX32660, CY8C3665LTI-002 uniquely combines CAN 2.0b, CapSense®, and a configurable analog subsystem in one die - reducing component count and PCB area in industrial HMI and sensor aggregation nodes where mixed-signal integration is critical.

Availability

CY8C3665LTI-002 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, human-machine interfaces, and programmable logic controller I/O modules requiring stable component supply and long-term lifecycle support.

Supply support for CY8C3665LTI-002 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, inheriting its PSoC® portfolio - a leader in configurable mixed-signal SoCs with over two decades of programmable analog/digital IP development.

The CY8C36 family targets industrial and medical edge devices needing reconfigurable signal chains, real-time control, and fieldbus connectivity - designed to replace discrete analog front-ends, microcontrollers, and interface ICs in space-constrained applications.

FAQ

Does CY8C3665LTI-002 support USB device functionality without external crystal?

Yes. It integrates a full-speed (12 Mbps) USB 2.0 PHY with an internal oscillator calibrated to ±0.25% accuracy across voltage and temperature - eliminating need for external 12-MHz crystal in USB device implementations. The internal oscillator is factory-trimmed and supports automatic frequency tuning during enumeration.

What is the maximum achievable CAN bit rate and how is it configured?

The CY8C3665LTI-002 supports CAN bit rates up to 1 Mbps using its hardware CAN controller. Bit timing is configured via three registers (BTR0/BTR1/SJW) defining synchronization jump width, time segment 1/2 lengths, and prescaler - with values derived from the selected system clock source (e.g., 24 MHz IMO or 8 MHz crystal).

Can all 62 GPIOs be used simultaneously as analog inputs?

No. While the device supports analog routing to any GPIO, only up to 24 channels can be sampled concurrently due to ADC multiplexer and DMA descriptor limitations. Simultaneous sampling across more than 24 pins requires time-multiplexed sequencing or external analog switches.

Is the 1.024 V internal voltage reference accessible externally for calibration purposes?

Yes. The 1.024 V ±0.1% reference is available on the VREF pin and can be routed to external test points or ADC reference inputs. It maintains stability across –40 °C to +85 °C with 14 ppm/°C drift, enabling high-accuracy self-calibration routines without external reference ICs.