The CY8C4247FNI-BL493T: It's a single-core device in a 68-ball WLCSP package, offering 36 general-purpose I/O lines and an internal oscillator, so you can skip the external crystal for the core clock. What sets this part apart is the integrated Bluetooth radio and CapSense touch-sensing hardware — it's designed for wireless sensor nodes, human-machine interfaces, and battery-operated products where board space is tight. Supply voltage is 1.71 V.
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68-WLCSP footprint — what it means for assembly
The package is bare silicon with solder bumps — no plastic overmold — so it's more sensitive to moisture and mechanical stress. Surface-mount assembly with a fine-pitch WLCSP requires a solder paste stencil designed for the ball diameter and pitch, plus a reflow profile that matches the package's thermal mass. X-ray inspection after reflow is standard practice to catch head-in-pillow or non-wet opens.
Peripheral set — Bluetooth, CapSense, and more
Beyond the BLE radio, the peripheral list includes CapSense (for touch buttons and sliders), a brown-out detect/reset, low-voltage detect, power-on reset, PWM, and a watchdog timer. The connectivity block supports I²C, IrDA, LINbus, Microwire, SmartCard, SPI, SSP, and UART/USART — enough to talk to most sensors, displays, and serial peripherals without external protocol translators. The 8-channel 12-bit successive-approximation ADC is the primary analog front-end. No DAC is listed on this variant, so if you need analog output, you'll route PWM through an external filter or step up to a sibling with integrated IDAC.