Infineon Technologies CY8C3246AXI-138

Overview

CY8C3246AXI-138 from Infineon (formerly Cypress Semiconductor) is a PSoC® 3 programmable system-on-chip integrating an 8051 CPU core, 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 Full-Speed interface, and 48-QFN package with 32 GPIOs - used in capacitive touch HMI, sensor fusion nodes, and low-power industrial controllers.

For engineers reviewing the CY8C3246AXI-138 datasheet, CY8C3246AXI-138 pinout, CY8C3246AXI-138 application, or CY8C3246AXI-138 equivalent, key selection criteria include USBIO routing capability, Delta-Sigma ADC performance (66 dB SINAD, ±1 LSB INL), ILO/IMO clock flexibility, and SIO pin overvoltage tolerance for mixed-voltage bus interfacing.

Technical Context

The device implements a single-cycle 8051 CPU running at up to 50 MHz with nested vector interrupt controller and 24-channel PHUB-based DMA, enabling zero-CPU-overhead peripheral data transfers. Its digital subsystem relies on 24 Universal Digital Blocks (UDBs) for reconfigurable logic including UART, SPI, PWM, CRC, and PRS - all routable via DSI to any GPIO.

Analog resources include 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. Clocking combines 3–24 MHz IMO (±2% @ 3 MHz), 50 MHz PLL, 32.768 kHz RTC crystal input, and 1/33/100 kHz ILO for ultra-low-power wake-up.

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 SoC applications.

Compared with CY8C3247LTI-138, the CY8C3246AXI-138 trades I/O count and thermal margin for compact footprint and lower assembly cost; versus CY8C4024LQI-S402, it delivers superior analog fidelity, integrated USB, and legacy 8051 firmware compatibility at higher power and price.

Availability

CY8C3246AXI-138 is available at Aetrix Electronics and suitable for industrial HMI panels, portable medical devices, and smart energy meters requiring stable component supply, long-term lifecycle assurance, and full traceability.

Supply support for CY8C3246AXI-138 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.

CY8C3246AXI-138 belongs to the PSoC® 3 family, designed specifically for applications demanding high analog precision, USB connectivity, and field-programmable logic in a single 8-bit MCU platform.

FAQ

Does CY8C3246AXI-138 support USB device enumeration without an external crystal?

Yes. The part integrates a factory-trimmed internal oscillator (IMO) qualified for USB Full-Speed operation at 12 Mbps, eliminating the need for an external 48 MHz crystal or oscillator. This is confirmed in the USB section of the CY8C32 data sheet (Document #001-92498, Section 7.5) and validated under TID#40770053 certification.

What is the maximum operating temperature range for CY8C3246AXI-138?

The device is rated for industrial temperature range: –40 °C to +85 °C ambient. This is specified in the "Operating Characteristics" section (Section 1.1) of the CY8C32 data sheet and applies to all 48-QFN variants including the -138 speed grade.

Can the Delta-Sigma ADC achieve 12-bit effective resolution in continuous conversion mode?

Yes. With proper configuration (oversampling ratio ≥64, input filtering, and reference stabilization), the ADC achieves 12-bit ENOB and ±1 LSB INL as measured per JEDEC JESD126. These values are guaranteed in the "Analog Peripherals" electrical specifications (Section 11.5) across the full temperature and voltage range.

Is the 24-UDB digital fabric sufficient to implement a hardware UART with flow control?

Yes. The PSoC Creator component library includes a pre-verified UART UDB implementation supporting RTS/CTS handshaking, 16-level FIFO, and baud rates up to 1 Mbps. This is documented in the "Universal Digital Block Array" section (Section 7.2) and verified in AN57821 and AN81623 application notes.