Infineon Technologies CY8C6347BZI-BLD33T

Overview

CY8C6347BZI-BLD33T 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 V to 3.6 V, achieves 7 µA Deep Sleep current with 64-KB SRAM retention, and supports secure boot, hardware crypto acceleration, and CAPSENSE™ for touch interfaces. Used in battery-powered IoT edge nodes requiring wireless connectivity and low-power sensing.

For engineers reviewing the CY8C6347BZI-BLD33T datasheet, CY8C6347BZI-BLD33T pinout, CY8C6347BZI-BLD33T application, or CY8C6347BZI-BLD33T equivalent, key selection criteria include dual-CPU power efficiency (22 µA/MHz @ 0.9 V on M4), Bluetooth LE link-layer concurrency (4 simultaneous connections), QSPI XIP with on-the-fly encryption, and Smart I/O™ Boolean logic in Deep Sleep mode.

Technical Context

The device implements a tightly coupled dual-CPU subsystem where the Cortex-M4F handles real-time signal processing and protocol stacks while the Cortex-M0+ manages Bluetooth LE Link Layer and system housekeeping-enabling concurrent application and radio execution without resource contention. Inter-processor communication uses hardware IPC channels with doorbell interrupts and shared memory protected by eight Protection Contexts.

Its Bluetooth LE subsystem integrates a 2.4-GHz RF transceiver with –95 dBm RX sensitivity, programmable TX output up to +4 dBm, and a dedicated Link Layer engine supporting master/slave roles and 2 Mbps data rate-operating independently of CPU cores via DMA and event-driven triggers.

Key Specifications

Pinout & Package

This device is housed in a 124-ball BGA package (10 mm × 10 mm, 0.8 mm pitch) with USB support. Pin functions are defined per the CY8C6347BZI-BLD33T-specific pinout diagram in Infineon's datasheet section 4 (page 32).

Key Features

Applications

Equivalent & Alternatives

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

Compared with nRF52840 and DA1469x, CY8C6347BZI-BLD33T uniquely combines dual-CPU power scaling, hardware-programmable analog/digital blocks, and integrated SIMO buck-enabling single-chip sensor fusion, secure BLE edge AI, and sub-µA system-level standby without external PMIC.

Availability

CY8C6347BZI-BLD33T is available at Aetrix Electronics and suitable for wearable health monitors, smart home sensor hubs, industrial wireless nodes, and BLE audio remotes requiring stable component supply across design-in, prototyping, and volume production phases.

Supply support for CY8C6347BZI-BLD33T 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 manufacturer specializing in power management, automotive MCUs, security ICs, and industrial sensors-with annual revenue exceeding €14 billion and global manufacturing in Dresden, Villach, and Kulim.

CY8C6347BZI-BLD33T belongs to the PSoC™ 63 product line, designed specifically for secure, ultra-low-power IoT endpoints that integrate wireless connectivity, capacitive sensing, and heterogeneous compute-targeting certified medical, industrial, and consumer edge devices.

FAQ

What is the maximum operating frequency of the Cortex-M4F core in CY8C6347BZI-BLD33T?

The Cortex-M4F core operates at up to 150 MHz, verified under 1.1-V core supply with ±2% accuracy from the internal main oscillator (IMO) and PLL multiplication. Frequency stability is maintained across temperature (–40°C to +85°C) and voltage (1.7–3.6 V) ranges per datasheet Section 6.2.2.

Does CY8C6347BZI-BLD33T support external crystal oscillators for Bluetooth timing accuracy?

Yes-it integrates on-chip 32-kHz and 16–35 MHz crystal oscillators. For Bluetooth LE timing compliance, a 32-kHz crystal (±20 ppm) is required for the BLE radio's sleep clock, and a 24-MHz or 32-MHz crystal (±10 ppm) is recommended for the system clock to meet BLE 5.0 frequency tolerance requirements.

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

Yes-Smart I/O™ ports retain full Boolean logic functionality (AND/OR/XOR/latch) while the system is in Deep Sleep mode, drawing <1 µA total. Input events trigger wake signals directly to the M0+ CPU without waking the M4 core, enabling ultra-low-power pattern detection such as multi-tap gestures or serial bitstream recognition.

Is the on-chip SIMO buck converter mandatory for operation, or can external regulators be used?

The SIMO buck converter is optional: CY8C6347BZI-BLD33T supports both internal SIMO (for 1.1-V or 0.9-V core rails) and external regulated supplies. When bypassed, VCCD and VCCM must be supplied externally at 1.1 V or 0.9 V respectively, with tight tolerance (±30 mV) and low-noise filtering per datasheet Section 5.1.