Infineon Technologies CY8C6347BZI-BLD53

Overview

CY8C6347BZI-BLD53 from Infineon is a dual-core Arm® Cortex®-M4F/M0+ microcontroller with integrated Bluetooth® 5.0 radio, 1-MB flash, 288-KB SRAM, and programmable analog/digital peripherals. It operates from 1.7–3.6 V, delivers up to 4 dBm TX power, –95 dBm RX sensitivity, and supports four concurrent BLE connections in low-power Deep Sleep (7 µA with 64-KB SRAM retention). Used in battery-powered IoT edge nodes requiring secure wireless sensor aggregation.

For engineers reviewing the CY8C6347BZI-BLD53 datasheet, CY8C6347BZI-BLD53 pinout, CY8C6347BZI-BLD53 application, or CY8C6347BZI-BLD53 equivalent, key selection criteria include dual-CPU power efficiency (22 µA/MHz @ 0.9 V on M4), BLE 5.0 link-layer concurrency, QSPI XIP with hardware encryption, CAPSENSE™ liquid-tolerant touch, and ROM-based Secure Boot for firmware integrity.

Technical Context

The device implements a tightly coupled dual-CPU architecture where the Cortex-M4F handles compute-intensive tasks (e.g., audio processing, protocol stacks) while the Cortex-M0+ manages real-time BLE link-layer operations and peripheral control. Both cores share memory-mapped peripherals via a high-bandwidth interconnect and coordinate via IPC and dual-channel DMA.

Its Bluetooth subsystem integrates a 2.4-GHz RF transceiver with digital PHY, hardware-accelerated Link Layer engine, and configurable TX power (–20 to +4 dBm), enabling certified BLE 5.0 operation including 2 Mbps data rate and long-range coded PHY support without host CPU intervention.

Key Specifications

Pinout & Package

This device is packaged in a 124-ball BGA (9 × 9 mm, 0.5-mm pitch), designated as "BZI" per Infineon's package coding. The package supports USB interface and includes dedicated RF matching pins, antenna feed (ANT), and differential RFIO lines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-core BLE MCU applications.

Compared with nRF5340 and DA1469x, CY8C6347BZI-BLD53 uniquely combines dual-application cores, hardware BLE link layer, programmable analog/digital fabric, and ROM-secured boot-enabling single-chip implementation of secure, sensor-dense, low-power wireless endpoints without external peripherals.

Availability

CY8C6347BZI-BLD53 is available at Aetrix Electronics and suitable for wireless sensor nodes, smart home hubs, wearable health monitors, and industrial asset tags requiring stable component supply, long-term lifecycle support, and qualified automotive-grade traceability.

Supply support for CY8C6347BZI-BLD53 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 is a German semiconductor leader specializing in power management, security, and embedded control solutions for industrial, automotive, and IoT markets.

This part belongs to the PSoC™ 63 product line-designed specifically for secure, ultra-low-power, wireless-enabled edge devices that integrate heterogeneous processing, analog sensing, and BLE connectivity in a single chip.

FAQ

Does CY8C6347BZI-BLD53 support over-the-air (OTA) firmware updates via BLE?

Yes. The device supports secure OTA updates using its ROM-based Secure Boot and flash partitioning (application flash, AUXflash, SFlash). Firmware images are validated cryptographically before execution, and the QSPI XIP interface allows encrypted update payloads to be streamed directly from external flash without full image buffering in SRAM.

What is the maximum allowed clock frequency for the Cortex-M4F core?

The Cortex-M4F core is rated for operation up to 150 MHz. This maximum frequency is achievable when powered at 1.1 V core voltage and using the PLL clock source. At 0.9 V core voltage, the maximum supported frequency is reduced to 100 MHz to maintain timing closure and power efficiency.

Can the Smart I/O™ blocks operate independently during Deep Sleep mode?

Yes. Two Smart I/O™ ports (16 GPIOs total) remain fully functional in Deep Sleep mode, executing Boolean logic (AND, OR, XOR, NOT) on input signals without waking either CPU. This enables wake-on-pattern detection-for example, triggering a wake event when three specific buttons are pressed simultaneously.

Is external flash required to use the QSPI XIP feature?

Yes. QSPI XIP requires an external quad-SPI flash memory connected to the dedicated QSPI pins (e.g., IO[0]–IO[5], SCLK, HOLD, WP). The on-chip 1-MB flash cannot be used for XIP; it serves only for primary firmware storage and executes from internal buses. External flash must support octal or quad protocols up to 640 Mbps throughput.