Infineon Technologies CY8C3245LTI-144

Overview

CY8C3245LTI-144 from Infineon Technologies (acquired Cypress Semiconductor) is a programmable 8-bit PSoC® 3 system-on-chip integrating an enhanced 8051 CPU, configurable analog and digital peripherals, 64 KB flash, 8 KB RAM, and CapSense® touch interface support. It operates from 1.71–5.5 V at up to 50 MHz, features 24-channel DMA, USB 2.0 Full-Speed (12 Mbps), and 62-capacitive-sensor CapSense capability - deployed in industrial HMI, medical sensor hubs, and battery-powered smart controls.

For engineers reviewing the CY8C3245LTI-144 datasheet, CY8C3245LTI-144 pinout, CY8C3245LTI-144 application, or CY8C3245LTI-144 equivalent, key selection criteria include its 144-pin TQFP package with dual VDDIO domains, integrated 12-bit Delta-Sigma ADC (±1 LSB INL), 8-bit DAC, and USBIO routing flexibility for embedded USB device firmware development.

Technical Context

The CY8C3245LTI-144 implements a single-cycle 8051 core with nested vector interrupt controller and 24-channel PHUB-based DMA, enabling zero-CPU-overhead peripheral data movement. Its clock tree includes a 3–24 MHz IMO (±2% @3 MHz), 50 MHz PLL, and dedicated ILO (1/33/100 kHz) for ultra-low-power wake-up.

Analog subsystem integration centers on a reconfigurable Delta-Sigma ADC (12-bit, 66 dB SINAD, <100 µV offset), two comparators, 1.024 V ±1% reference, and 8-bit DAC (1 Msps VDAC / 8 Msps IDAC), all routable to any GPIO via programmable analog interconnect.

Key Specifications

Pinout & Package

Package: 144-pin TQFP (20 mm × 20 mm, 0.5 mm pitch), RoHS-compliant, with exposed thermal pad connected to VSSD. Features four independent VDDIO domains (VDDIO0–VDDIO3) enabling mixed-voltage I/O interfacing without level shifters.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C3245LTI-144, the -146 variant improves USB robustness for end-user-facing ports, while the -147 variant trades minor cost increase for factory-calibrated timing and extended nonvolatile storage - both retain full pin and code compatibility.

Availability

CY8C3245LTI-144 is available at Aetrix Electronics and suitable for industrial HMI, portable medical instrumentation, and smart energy metering requiring stable component supply across multi-year production cycles.

Supply support for CY8C3245LTI-144 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 for embedded control and human interface applications.

CY8C3245LTI-144 belongs to the PSoC® 3 family, designed specifically for cost-sensitive, low-power embedded systems requiring analog precision, capacitive touch, and USB connectivity without external support ICs.

FAQ

Does CY8C3245LTI-144 require an external crystal for USB operation?

No. The device integrates a TID#40770053-certified USB 2.0 Full-Speed PHY with an internal oscillator that meets USB timing requirements without external crystal. External crystals (4–25 MHz) are optional for higher-precision clocking or RTC operation using 32.768 kHz.

Can all 72 GPIOs be used simultaneously for CapSense®?

Yes - all GPIOs support CapSense® functionality, but practical sensor count depends on routing constraints and mutual capacitance coupling. The datasheet confirms up to 62 self-capacitance or mutual-capacitance sensors, validated using PSoC Creator's CapSense Component with auto-tuning.

What is the maximum sustained current per VDDIO domain?

Each VDDIO domain (VDDIO0–VDDIO3) supports up to 100 mA total sink current across its associated GPIO group. This is specified in the "I/O Pin Current Limit" diagram (Figure 2-2) and applies regardless of operating voltage within 1.71–5.5 V range.

Is the boost converter capable of powering external circuitry?

Yes. The VBOOST pin delivers a regulated output (programmable 3.3–5.0 V) with up to 100 mA continuous current. It is explicitly designed to power external peripherals such as LCD bias supplies, op-amps, or RF modules - detailed in Section 6.3 "Power System" of the datasheet.