The Cypress CY8C3444LTI-119 is an 8-bit 8051-based PSoC 3 microcontroller from the CY8C34xx family, clocked at 50 MHz with 16 KB of on-chip Flash program memory. It integrates a 16-channel 12-bit ADC and a 2-channel 8-bit DAC, plus CapSense touch-sensing and an LCD drive controller — all in a 48-pin QFN package.
50 MHz 8051 — bus timing and peripheral loading
At 50 MHz the 8051 pipeline delivers roughly 12.5 MIPS, enough for real-time control loops and protocol handling.
Analog integration — ADC, DAC, and CapSense on one die
The 16-channel 12-bit ADC covers multiplexed sensor inputs — thermistors, strain gauges, or potentiometers — without an external mux. The two 8-bit DACs can drive analog outputs for set-point control or waveform generation. CapSense handles capacitive touch buttons and sliders, and the LCD controller drives segment displays directly. For a panel with touch buttons and a small LCD, this part replaces a separate MCU plus an ADC and a touch controller.
The supply voltage range extends from 1.71 V up to the device's rated maximum, which covers both 1.8 V and 3.3 V logic rails. For the buyer asking about 3.3 V logic compatibility: the I/O pins are 3.3 V-tolerant when the Vddio rail is set accordingly — no level shifters needed for common 3.3 V peripherals like SPI Flash or I²C sensors.
Package and footprint — 48-QFN with exposed pad
The pad also provides a low-inductance ground return for the analog and digital sections. If you are hand-assembling prototypes, pre-bake the parts at 125°C for 24 hours if the moisture-barrier bag has been open — QFN packages are MSL 3 and can delaminate during reflow if moisture is trapped.