PSoC 1 mixed-signal MCU — configurable analog and digital in one die
The Infineon CY8C27443-24PVXI belongs to the PSoC®1 CY8C27xxx family, a configurable mixed-signal array with an 8-bit M8C CPU core running at 24 MHz. It integrates 16 KB of Flash program memory, 24 general-purpose I/O pins, and on-chip data converters: a 4-channel 14-bit ADC and a 4-channel 9-bit DAC.
Mixed-signal integration — what the 14-bit ADC and 9-bit DAC mean for the BOM
The 4-channel, 14-bit successive-approximation ADC resolves analog inputs from potentiometers, thermistors, or current-sense resistors without an external converter. The 4-channel 9-bit DAC generates analog setpoints or reference voltages for downstream circuitry. For a design that needs a few analog inputs and outputs alongside digital control, this integration collapses the signal chain into one IC — saving the cost and footprint of an external ADC/DAC pair and the associated level-shifting.
24 I/O and serial interfaces — fitting the peripheral map
With 24 I/O pins, the CY8C27443-24PVXI can handle a keypad matrix, a few LED indicators, and a serial link to a host controller. If your design needs more than 24 I/O, the pin-compatible CY8C29466-24PVXI (same 28-SSOP package) offers the same core and peripherals but with 12 ADC channels — though I/O count remains 24; for 40 I/O, step up to the CY8C29566-24AXIT in a 48-pin QFP.
Package and footprint — 28-pin SSOP layout notes
The 28-pin SSOP (shrink small-outline package) has a 0.65 mm pitch and a body width around 5.3 mm. It is a surface-mount package requiring standard reflow soldering. No exposed thermal pad — junction-to-ambient thermal resistance is handled through the leads and PCB copper.