Infineon Technologies CY8C4248LQI-BL573T

Overview

CY8C4248LQI-BL573T from Cypress Semiconductor (now Infineon) is a programmable System-on-Chip integrating an Arm® Cortex®-M0 CPU, 256 KB flash, 32 KB SRAM, and a fully compliant Bluetooth Low Energy 4.2 radio subsystem (BLESS). It delivers –89 dBm RX sensitivity, +3 dBm TX output, and operates down to 1.71 V supply. Used in battery-powered BLE sensor nodes requiring integrated analog sensing, capacitive touch, and low-power wireless connectivity.

For engineers reviewing the CY8C4248LQI-BL573T datasheet, CY8C4248LQI-BL573T pinout, CY8C4248LQI-BL573T application, or CY8C4248LQI-BL573T equivalent, key selection criteria include BLE 4.2 PHY compliance, Deep Sleep current of 1.5 µA with WCO active, 12-bit 1-Msps SAR ADC with sequencer, and programmable UDB-based digital logic for custom peripheral implementation.

Technical Context

The device implements a dual-oscillator clock architecture with a 24-MHz ECO for BLE RF timing and a 32-kHz WCO for low-power Deep Sleep wake-up. Its BLESS subsystem integrates digital PHY, link-layer engine (master/slave), and RF transceiver with 50-Ω antenna drive capability.

Analog resources include four opamps supporting Comparator mode and ADC input buffering, two low-power comparators active in Deep Sleep, and Cypress's CSD-based CapSense with SmartSense™ auto-tuning. Digital flexibility stems from four Universal Digital Blocks (UDBs), each with eight macrocells and data path, enabling user-defined state machines or Verilog-derived peripherals.

Key Specifications

Pinout & Package

Package: 7 mm × 7 mm, 56-pin QFN (LQFP-style leadless, exposed thermal pad).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar BLE microcontroller applications.

Compared with nRF52832-QFAA and CC2642R1F, CY8C4248LQI-BL573T uniquely combines BLE 4.2, programmable analog/digital fabric, and production-ready CapSense - reducing design cycle time for sensor-integrated BLE endpoints where analog integration and field-tunable logic are essential.

Availability

CY8C4248LQI-BL573T is available at Aetrix Electronics and suitable for smart home sensor nodes, wearable health monitors, industrial asset tags, and interactive consumer remotes requiring stable component supply and long-term manufacturability.

Supply support for CY8C4248LQI-BL573T 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

Cypress Semiconductor was acquired by Infineon Technologies in 2020 and now operates as Infineon's PSoC division, delivering programmable mixed-signal SoCs for embedded control and connectivity.

This part belongs to the PSoC 4200_BLE family - designed specifically for ultra-low-power, sensor-rich BLE endpoints where analog integration, flexible digital logic, and secure firmware execution converge in a single die.

FAQ

Does CY8C4248LQI-BL573T support Bluetooth 5.0?

No. This device implements Bluetooth 4.2 only, as confirmed in the official datasheet (Document Number 002-23053 Rev. **). It does not support Bluetooth 5.0 features such as 2× data rate, extended advertising, or coded PHY. For Bluetooth 5.0, consider Infineon's later PSoC 6 series with dual-core architecture and updated BLESS.

Can the 24-MHz crystal be omitted if using internal IMO for BLE?

No. The BLE radio subsystem requires the 24-MHz external crystal (XTAL_IN/XTAL_OUT) for RF timing accuracy and regulatory compliance. The internal IMO is insufficient for BLE transmission stability and cannot replace the crystal. Omitting it prevents BLE operation entirely.

How many CapSense electrodes can be implemented simultaneously?

Up to 64 self-capacitive or 32 mutual-capacitive electrodes are supported, constrained by available GPIOs and scan time. The CSD block uses shared analog resources; simultaneous scanning depends on configuration - typical production designs use 8–16 electrodes with SmartSense™ auto-calibration enabled per scan cycle.

Is debug access permanently disabled after enabling device security?

Yes. When device security is activated (via SPC register lock), all debug interfaces - including SWD, ROM bootloader, and mass erase - are permanently disabled. Recovery requires physical replacement. Debug should be disabled only after final firmware validation and production programming.