48 MHz Cortex-M0+ in a 2 mm x 1.93 mm WLCSP — the space-constrained touch-and-display MCU
The Infineon CY8C4745FNI-S412T is a PSoC 4 family MCU built around a 32-bit ARM Cortex-M0+ core clocked at 48 MHz. The supply voltage range spans 1.71 V to 5.5 V, so it can run from a single Li-ion cell or a regulated 3.3 V / 5.0 V rail without an external LDO. On-chip peripherals include a 16-channel 10-bit ADC, brown-out and low-voltage detect, POR, PWM timers, and a watchdog timer.
WLCSP rework and handling notes
The 25-WLCSP package has a 0.4 mm ball pitch typical for this class. The small body means the die is close to the board surface, so the reflow profile needs a controlled ramp rate to avoid thermal shock. The 21 GPIOs are all that fit in the 25-ball array. For designs needing more I/O, the QFN-packaged siblings in the same PSoC 4 family offer 34 or 36 I/O in a larger footprint.
Lifecycle and compliance
It is ROHS3 compliant.