PIC32MX220F032B-I/SO - 32-bit 40MHz MCU 32KB Flash 28-SOIC | Microchip
MPN: PIC32MX220F032B-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.71 | $271.00 |
| 500 | $2.42 | $1,210.00 |
| 1,000 | $2.18 | $2,180.00 |
PIC32MX220F032B-I/SO Overview
A PIC32MX 32-bit microcontroller belongs to the MIPS-based PIC32 family, which sits architecturally above the 8-bit PIC16/PIC18 and 16-bit dsPIC33 families and is positioned for higher-performance embedded applications. PIC32MX devices integrate a RISC CPU core, Flash program memory, SRAM, and rich I/O in a single CMOS chip, and the PIC32MX1XX/2XX sub-family (28/36/44-pin) is the smallest-flash-density PIC32 variant targeting USB-enabled consumer and industrial designs.
Key features of the PIC32MX220F032B include 83 DMIPS performance, sub-0.5 mA/MHz active current consumption, 2.3V to 3.6V single-supply operation, four DMA channels, five 16-bit general-purpose timers, an industrial -40C to +85C temperature grade, and up to 34 user I/O. The CTMU peripheral enables cost-effective capacitive touch button and slider implementation without external ICs, while the PMP and I2S peripherals support small graphics displays and audio codec interfacing.
This device is designed for cost-sensitive 32-bit USB embedded designs where PCB space is constrained. The 28-SOIC package is an industry-standard wide-body SOIC with 1.27 mm pitch, simplifying prototyping and rework. Combined with the MPLAB X IDE and Harmony framework, the PIC32MX220F032B-I/SO provides a low-risk migration path from 8/16-bit PIC designs to a true 32-bit MIPS core.
Typical applications include USB human-interface devices (HID), capacitive touch control panels, small graphics LCD interfaces, audio accessories, and low-cost 32-bit industrial sensor hubs. Designers appreciate its balance of USB, touch, and graphics peripherals in a small SOIC footprint.
When designing with the PIC32MX220F032B-I/SO, note the 2.3V to 3.6V supply range is shared by both core and I/O - there is no separate analog rail. Decouple VDD/VSS pairs adjacent to the ICSP PGECx/PGEDx programming/debug pins to ensure stable in-circuit programming.
This page synthesizes distributor stock, parametric drop-in alternatives, and practical design considerations not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC32MX220F032B-I/SO — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC32MX220F032B-I/SO (same form factor and footprint) — differing in Package, ADC, Core Architecture, Timers, DMA Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX120F032B-I/SO
✅ Drop-In✓ In Stock
$1.71 / Unit
View Datasheet →PIC32MX130F064B-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX170F256B-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX174F256B-I/SO
✅ Drop-In✓ In Stock
$3.75 / Unit
View Datasheet →PIC32MX220F032B-I/SP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX230F064B-I/SO
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →PIC32MX220F032B-I/SO Maximum Ratings & Electrical Characteristics
| Core | MIPS32 M4K 32-bit RISC |
| Maximum CPU Frequency | 40 MHz (83 DMIPS) |
| Program Memory (Flash) | 32 KB (32K x 8) |
| Data Memory (SRAM) | 8 KB |
| Operating Voltage Range | 2.3 V to 3.6 V |
| Active Current Consumption | < 0.5 mA/MHz |
| I/O Pins | up to 34 |
| DMA Channels | 4 |
| Timers | Five 16-bit general purpose |
| USB | USB 2.0 Full-Speed |
| I2S/SPI Modules | 2 |
| Parallel Master Port (PMP) | Yes |
| ADC | 10-bit |
| Charge Time Measurement Unit (CTMU) | Yes - mTouch capacitive touch |
| Peripheral Pin Select (PPS) | Yes |
| Package | 28-pin SOIC (SO) |
| Operating Temperature | -40C to +85C (industrial) |
| Mounting Type | Surface Mount |
| MSL Level | 1 |
| RoHS Status | Compliant |
PIC32MX220F032B-I/SO Pin Configuration
| Pin 1 | RA0 — General purpose I/O / CTMU |
| Pin 2 | RA1 — General purpose I/O / CTMU |
| Pin 3 | RA2 — General purpose I/O / CTMU |
| Pin 4 | RA3 — General purpose I/O / CTMU |
| Pin 5 | RA4 — General purpose I/O / CTMU |
| Pin 6 | AVDD — Analog supply (2.3-3.6 V) |
| Pin 7 | AVSS — Analog ground |
| Pin 8 | RA7 — General purpose I/O |
| Pin 9 | RB0 — General purpose I/O / CTMU |
| Pin 10 | RB1 — General purpose I/O / CTMU |
| Pin 11 | RB2 — General purpose I/O / CTMU |
| Pin 12 | RB3 — General purpose I/O / CTMU |
| Pin 13 | RB4 — General purpose I/O / SDA2 |
| Pin 14 | RB5 — General purpose I/O / SCL2 |
| Pin 15 | VSS — Digital ground |
| Pin 16 | RB7 — General purpose I/O / PGEC1 |
| Pin 17 | RB8 — General purpose I/O / PGED1 |
| Pin 18 | RB9 — General purpose I/O |
| Pin 19 | VDD — Digital supply (2.3-3.6 V) |
| Pin 20 | RB11 — General purpose I/O |
| Pin 21 | RB12 — General purpose I/O |
| Pin 22 | RB13 — General purpose I/O |
| Pin 23 | RB14 — General purpose I/O |
| Pin 24 | RB15 — General purpose I/O |
| Pin 25 | D- — USB D- line (27 ohm series resistor to connector) |
| Pin 26 | D+ — USB D+ line (27 ohm series resistor to connector) |
| Pin 27 | VUSB — USB internal transceiver supply |
| Pin 28 | VSS — Digital ground |
Typical Applications
PIC32MX220F032B-I/SO is suitable for 6 applications: USB Human Interface Device (HID), Capacitive Touch Control Panels, Small Graphics LCD / OLED Interfaces, Audio Accessories and Codec Interfaces, Low-Cost Industrial Sensor Hubs, USB-to-UART Bridge Dongles.
USB Human Interface Device (HID)
The PIC32MX220F032B-I/SO is ideally suited to USB HID peripherals such as keyboards, mice, game controllers, and custom input devices. Its integrated USB 2.0 Full-Speed device peripheral with on-chip transceiver eliminates the need for an external USB PHY, reducing BOM cost on small HID dongles. The 32 KB Flash easily holds HID class drivers plus application code, while 8 KB SRAM is sufficient for HID report buffers and small protocol stacks. The 40 MHz MIPS M4K core delivers 83 DMIPS, so HID polling rates at 1 kHz leave ample headroom for debouncing, LED animation, and capacitive touch handling via the on-chip CTMU peripheral.
Recommended
Capacitive Touch Control Panels
The PIC32MX220F032B-I/SO's Charge Time Measurement Unit (CTMU) and dedicated mTouch capacitive-touch library make it a strong fit for touch-button and slider panels in consumer appliances. The CTMU measures sub-nanoelectrical charge time on a GPIO pin to detect capacitance changes caused by finger proximity, with no external touch-sensing IC required. The 83 DMIPS MIPS core runs the mTouch signal-processing and noise-immunity algorithms, while 8 KB SRAM holds the touch-scan state machine. Operating from 2.3-3.6V lets the MCU share power with a small LCD backlight driver, and the 28-SOIC footprint is small enough for slim product enclosures.
Recommended
Small Graphics LCD / OLED Interfaces
The PIC32MX220F032B-I/SO features a Parallel Master Port (PMP) that connects directly to small graphical OLED and TFT displays, including monochrome 128x64 OLEDs and small color TFTs up to QVGA. PMP supports 8-bit and 16-bit parallel interfaces with dedicated enable and read/write strobes, offloading display work from the CPU via DMA. The 32 KB Flash holds a small graphics library (Microchip MLA / Harmony GFX) plus menu bitmaps, and 8 KB SRAM frames a small display buffer. Combined with 5x16-bit timers for PWM backlight control, this PIC32 part is a cost-effective solution for low-cost IMI/IML products.
Recommended
Audio Accessories and Codec Interfaces
The PIC32MX220F032B-I/SO integrates two I2S/SPI modules that connect directly to low-cost audio codecs such as the Microchip AK4642, S/PDIF transmitters, and DAC chips, enabling USB-to-I2S bridges and headphone amplifiers. Its 32-bit MIPS core can run USB Audio Class firmware at full speed while streaming 48 kHz / 16-bit stereo I2S in the background, leveraging four DMA channels to offload the codec data path. The 40 MHz MIPS M4K core runs a free DSP library for tone shaping or basic audio effects. Combined with the CTMU, the part can also implement volume control sliders without mechanical pots.
Recommended
Low-Cost Industrial Sensor Hubs
The PIC32MX220F032B-I/SO's industrial -40C to +85C temperature rating, 5x16-bit timers, 4 DMA channels, and 10-bit ADC make it suitable for low-cost industrial sensor hubs that aggregate analog and digital sensor data. The Peripheral Pin Select (PPS) remappable I/O allows the same PCB layout to support SPI sensors, UART IMI links, or I2C IMI peripherals without rework. The USB device peripheral enables the hub to present as a USB CDC virtual COM port to a host PC for configuration and data logging. The 2.3-3.6V supply range supports common 3.3V industrial rails, and 32 KB Flash holds a small Modbus RTU or CANopen stack with room for application logic.
Recommended
USB-to-UART Bridge Dongles
The PIC32MX220F032B-I/SO is widely used as a USB-to-UART bridge in firmware debug tools, industrial converters, and IMI programming cables. The on-chip USB Full-Speed device, two UART peripherals, and 32 KB Flash hold a CDC-ACM bridge stack with virtual COM port enumeration on Windows, Linux, and macOS without external drivers. The 4 DMA channels handle USB endpoint memory efficiently, and 8 KB SRAM buffers full-speed UART traffic at 921600 baud without overrun. The 28-SOIC package is hand-solderable for low-volume IMI tools, and the -40C to +85C industrial grade supports factory-floor temperature profiles.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX220F032B-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX120F032B-I/SO | PIC32MX130F064B-I/SO | PIC32MX170F256B-I/SO | PIC32MX174F256B-I/SO | PIC32MX230F064B-I/SO |
|---|---|---|---|---|---|---|
| Package | 28-SOIC | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 32 KB | 32 KB (same) | 64 KB (+100%) | 256 KB (+700%) | 256 KB (+700%) | 64 KB (+100%) |
| SRAM | 8 KB | 8 KB (same) | 16 KB (+100%) | 64 KB (+700%) | 64 KB (+700%) | 16 KB (+100%) |
| Maximum CPU Frequency | 40 MHz | 40 MHz (same) | 40 MHz (same) | 40 MHz (same) | 40 MHz (same) | 50 MHz (+25%) |
| USB Full-Speed | Yes | No | Yes | Yes | Yes | Yes |
| Operating Voltage | 2.3-3.6 V | 2.3-3.6 V (same) | 2.3-3.6 V (same) | 2.3-3.6 V (same) | 2.3-3.6 V (same) | 2.3-3.6 V (same) |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C (same) | Industrial -40C to +85C (same) | Industrial -40C to +85C (same) | Industrial -40C to +85C (same) | Industrial -40C to +85C (same) |
Key Differentiators
- On-chip USB 2.0 Full-Speed with internal transceiver (vs PIC32MX120F032B-I/SO)
- Drop-in upgrade path to PIC32MX170F256B-I/SO (vs PIC32MX170F256B-I/SO)
- 32 KB Flash / 8 KB SRAM hits cost-optimal sweet spot (vs PIC32MX130F064B-I/SO)
Design Notes
Estimated: the PIC32MX220F032B-I/SO draws under 20 mA in active mode at 40 MHz, and under 20 uA in sleep. Place a 100 nF decoupling capacitor adjacent to each VDD/VSS pair on the 28-SOIC package, plus a 4.7 uF bulk capacitor near pin 19 (VDD). The single 2.3-3.6V supply powers both the digital core and the I/O; there is no separate analog rail, so an LC filter on AVdd is not required but recommended for low-noise ADC measurements.
Route USB D+ and D- (pins 25/26) as a 90-ohm differential pair with characteristic impedance of 90 ohms to the USB connector, and add the mandatory 27-ohm series resistors on each line close to the MCU. Keep the D+/D- traces short and isolated from switching regulators or PWM signals to meet USB 2.0 Full-Speed signal-integrity requirements. Pin 27 (VUSB) must be tied to VDD through a ferrite bead or directly to VDD if the internal USB 3.3V LDO is unused.
The PGECx/PGEDx ICSP programming/debug pairs must be used as a whole: if PGEC2 is selected, ICSPDAT must use PGED2, never PGED1. Failure to pair the ICSP lines prevents programming with MPLAB X. Also note that 32 KB Flash is tight for USB stacks - if you intend to use USB + a graphics library, consider the PIC32MX170F256B-I/SO drop-in upgrade which provides 256 KB Flash in the same 28-SOIC footprint with no PCB rework.
For capacitive touch via CTMU, route the touch electrodes on a single-layer PCB with a ground hatch around each button. The CTMU measures sub-nanosecond charge times, so parasitic capacitance from long traces (>50 mm) reduces touch sensitivity. Add a 100 nF series capacitor on each CTMU channel to reject DC and ESD, and use the mTouch Diagnostics GUI in MPLAB X to tune touch thresholds during bring-up.
Compliance Information
RoHS compliant per Microchip product page. MSL Level 1 moisture-sensitivity rating. Lead-free (Pb-free) 28-SOIC suitable for 260C peak-reflow JEDEC J-STD-020 profile. Not AEC-Q100 qualified - not intended for automotive under-the-hood applications.
