Infineon Technologies CY8C3245AXI-158

Overview

CY8C3245AXI-158 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® support. It operates from 1.71–5.5 V at up to 50 MHz, features 24-channel DMA, USB 2.0 FS interface, and 48-QFN packaging - deployed in industrial HMI touch panels requiring mixed-signal integration and low-power operation.

For engineers reviewing the CY8C3245AXI-158 datasheet, CY8C3245AXI-158 pinout, CY8C3245AXI-158 application, or CY8C3245AXI-158 equivalent, key selection criteria include its 48-pin QFN footprint, USBIO-capable I/O routing, 24 UDB-based digital logic blocks, Delta-Sigma ADC with <±1 LSB INL, and integrated 1.024 V ±1% reference for sensor signal conditioning.

Technical Context

The CY8C3245AXI-158 implements a single-cycle 8051 core with nested vector interrupt controller and 24-channel PHUB-based DMA, enabling zero-CPU-overhead peripheral data transfers. Its clock tree includes a 3–24 MHz IMO (±2% at 3 MHz), 50 MHz PLL, and 32.768 kHz RTC-capable external crystal input.

Analog subsystem integrates an 8–12-bit Delta-Sigma ADC (66 dB SINAD, <100 µV offset), dual comparators, 8-bit DAC (1 Msps VDAC / 8 Msps IDAC), and CapSense® engine supporting up to 62 sensors. All analog/digital signals are fully routable to any of 29 GPIO or 8 SIO pins via programmable interconnect.

Key Specifications

Pinout & Package

Package: 48-pin QFN (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced with exposed pad connected to VSSD.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY8C3245AXI-158, CY8C3246AXI-158 offers higher non-volatile data retention reliability, while CY8C4014LQI-422 trades analog accuracy and USB capability for ARM software scalability and deeper sleep - making the original optimal for USB-connected, sensor-rich industrial controllers needing proven 8051 firmware base.

Availability

CY8C3245AXI-158 is available at Aetrix Electronics and suitable for industrial HMI panels, portable medical diagnostics, automotive body electronics, and smart home sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for CY8C3245AXI-158 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 manufactures the PSoC® family, delivering programmable mixed-signal SoCs for industrial, automotive, and IoT applications.

The CY8C32 series targets embedded control systems demanding high analog precision, flexible digital logic, and USB connectivity - designed specifically for replacing multi-chip sensor interfaces and human-machine interaction subsystems.

FAQ

Does CY8C3245AXI-158 support USB device enumeration without external crystal?

Yes. The part integrates a certified USB 2.0 Full-Speed peripheral interface (TID#40770053) that operates using the internal 3–24 MHz IMO oscillator, eliminating need for external 12 MHz crystal. Internal oscillator stability meets USB suspend/resume timing requirements per USB-IF specification.

What is the maximum number of CapSense® electrodes supported on this device?

CY8C3245AXI-158 supports up to 62 CapSense® electrodes using its dedicated hardware engine and shared GPIO resources. Electrode count is limited by routing flexibility and scan time budget - typical implementation achieves 48 electrodes with <20 ms full-scan latency at 1 MHz modulation frequency.

Can the internal boost regulator power external circuitry?

Yes. The VBOOST pin delivers a regulated output (programmable 3.3 V or 5.0 V) sourced from input voltages as low as 0.5 V. It supports continuous 50 mA load current, sufficient to drive small LCD backlights or external op-amps - with thermal derating above 70°C ambient.

Is the 24-channel DMA controller capable of chaining transfers between flash and peripheral registers?

Yes. The PHUB-based DMA controller supports descriptor chaining across memory-mapped regions including flash, SRAM, and peripheral registers. Each channel can execute up to 256 chained descriptors, enabling autonomous ADC-to-memory or USB FIFO-to-SRAM transfers without CPU intervention.