PIC32MX120F032BT-I/SS
PIC32MX120F032BT-I/SS - 40MHz 32KB Flash 32-bit MCU | Microchip
The Microchip PIC32MX120F032BT-I/SS is a 32-bit MIPS M4K PIC microcontroller running at 40 MHz with 32 KB of Flash and 8 KB of SRAM, housed in a 28-pin SSOP package. It operates from 2.3 V to 3.6 V across an industrial temperature range of -40C to +105C, and integrates two I2S/SPI modules, two UART and I2C modules, a Parallel Master Port (PMP) for graphics interfaces, Peripheral Pin Select (PPS), and a Charge Time Measurement Unit (CTMU) for mTouch capacitive touch sensing. The device exposes 21 general-purpose I/O pins and includes separate parallel lanes for CPU and USB clocks.
A 32-bit microcontroller (MCU) is a microprocessor that integrates CPU core, memory, and peripherals on a single die. The PIC32MX family uses the MIPS M4K core, which sits in the broader taxonomy of 32-bit RISC microcontrollers -> microcontrollers -> microcontrollers and processors -> semiconductors. Compared with 8-bit and 16-bit MCUs, the 32-bit class delivers higher computational throughput, larger addressable memory, and richer peripherals, enabling single-chip implementations of USB, graphics, audio, and connectivity stacks. The 28-pin SSOP package places this device in the small-outline surface-mount family (SSOP -> SOIC family -> surface-mount -> SMD).
Key specifications include 40 MHz maximum CPU frequency, 32 KB Flash program memory, 8 KB SRAM, 21 GPIO, four hardware DMA channels, and less than 0.5 mA/MHz active current consumption. Integrated peripherals include two UART modules, two I2C modules, two I2S/SPI modules, an Analog-to-Digital Converter (ADC), five 16-bit timers, and a Real-Time Clock and Calendar (RTCC). Programmable Peripheral Pin Select remapping allows flexible pin assignment of most digital peripherals.
The PIC32MX120F032BT-I/SS belongs to the PIC32MX1XX/2XX family, sharing a common peripherals set, registers, and toolchain across 28/36/44-pin variants. The Microchip MPLAB X IDE and the MPLAB XC32 C compiler support this device, and the PIC32 family shares code compatibility across packages and pin counts. Pin-compatible migration paths exist across PIC32MX1XX/2XX 28-pin SSOP parts with different Flash/RAM densities, simplifying BOM selection when memory requirements change.
Typical applications include low-cost USB audio devices, capacitive touch user interfaces, graphics displays using PMP, industrial control panels, sensor hubs, and consumer electronics that need 32-bit performance at 8/16-bit price points. The CTMU peripheral supports mTouch capacitive buttons, sliders, and proximity sensing for human-interface designs.
Designers should note that the SSOP package dissipates approximately 0.5 mA/MHz, so total active power scales linearly with CPU clock. Decoupling capacitors of 100 nF plus 4.7 uF should be placed within 5 mm of the VDD/VSS pairs, and the PPS feature must be configured before peripherals become active on their default pins. Use the SSOP variant rather than SOIC when PCB height is constrained and when the 28-SSOP footprint is already laid out.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, and cross-references Microchip PIC32MX1XX/2XX family devices that share the 28-SSOP footprint.
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