PIC32MM0256GPM028T-I/SS - 256KB Flash 32-bit MCU | Microchip
MPN: PIC32MM0256GPM028T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.65 | $36.50 |
| 100 | $3.25 | $325.00 |
| 500 | $2.85 | $1,425.00 |
| 1,000 | $2.55 | $2,550.00 |
PIC32MM0256GPM028T-I/SS Overview
A 32-bit microcontroller (MCU) is an integrated processor core, memory, and peripherals on a single die that executes instructions 32 bits wide, giving significantly higher throughput than 8-bit or 16-bit cores for the same clock. The PIC32MM GPM family specifically targets ultra-low-power applications by combining the MIPS32 microAptiv core with sleep currents below 1 µA, allowing battery-powered products to last years on a single cell. The MCU belongs to the hierarchy: microcontroller -> embedded processor -> semiconductor -> integrated circuit.
Key features of the PIC32MM0256GPM028T-I/SS include 256 KB Flash with ECC for reliable code storage, 32 KB SRAM, hardware USB 2.0 full-speed device, multiple communication peripherals (UART, SPI, I2C), up to 21 GPIO pins, and a peripheral pin-select (PPS) system that lets designers remap digital functions to any I/O. The 28-SSOP package offers a compact 0.209 inch (5.30 mm) body with industry-standard pinout.
Typical applications include consumer electronics, IoT edge nodes, USB peripherals such as HID-class devices and CDC bridges, sensor hubs, low-cost motor control, and human-machine interface (HMI) controllers. The wide operating voltage range and low-power sleep modes also suit battery chargers, wearables, and energy-harvesting designs.
When designing with this device, ensure decoupling capacitors are placed close to the VDD pins and that the USB D+/D- lines are routed as a 90 Ω differential pair. The PPS system provides layout flexibility but requires careful register configuration to avoid contention on shared I/O.
This page synthesizes distributor pricing, drop-in package-compatible alternatives, and practical design guidance that complements - but does not replace - the manufacturer datasheet and reference documentation.
Drop-in alternatives for PIC32MM0256GPM028T-I/SS — 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 PIC32MM0256GPM028T-I/SS (same form factor and footprint) — differing in Core Architecture, Program Memory (Flash), ADC, Package, USB.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MM0256GPM028-I/SS
✅ Drop-In✓ In Stock
$2.12 / Unit
View Datasheet →PIC32MM0128GPM028T-I/ML
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.18 / Unit
View Datasheet →PIC32MM0256GPM028T-I/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | MIPS32 microAptiv PIC32 |
| Core Count | Single-core |
| Maximum CPU Speed | 25 MHz |
| Program Memory (Flash) | 256 KB (256K x 8) with ECC |
| SRAM | 32 KB |
| Data EEPROM | 4 KB (per family datasheet) |
| Operating Voltage | 2.0 V to 3.6 V |
| I/O Pins | 21 |
| USB | USB 2.0 Full-Speed Device |
| ADC | 12-bit (per family datasheet) |
| Communication Interfaces | UART, SPI, I2C |
| Package | 28-SSOP (0.209 inch / 5.30 mm body width) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (Industrial, -I suffix) |
| RoHS Status | Compliant |
| Packaging | Tape & Reel (T suffix) |
PIC32MM0256GPM028T-I/SS Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input, active low |
| Pin 2 | RA0 — Port A bit 0 / analog input / PPS remappable |
| Pin 3 | RA1 — Port A bit 1 / analog input / PPS remappable |
| Pin 4 | RB0 — Port B bit 0 / PPS remappable I/O |
| Pin 5 | RB1 — Port B bit 1 / PPS remappable I/O |
| Pin 6 | RB2 — Port B bit 2 / USB D- (alternate) |
| Pin 7 | RB3 — Port B bit 3 / USB D+ (alternate) |
| Pin 8 | VSS — Ground |
| Pin 9 | VDD — Positive supply 2.0-3.6 V |
| Pin 10 | RB4 — Port B bit 4 / PPS remappable I/O |
| Pin 11 | RB5 — Port B bit 5 / PPS remappable I/O |
| Pin 12 | RB6 — Port B bit 6 / PPS remappable I/O |
| Pin 13 | RB7 — Port B bit 7 / PPS remappable I/O |
| Pin 14 | RB8 — Port B bit 8 / PPS remappable I/O |
| Pin 15 | RB9 — Port B bit 9 / PPS remappable I/O |
| Pin 16 | RC0 — Port C bit 0 / PPS remappable I/O |
| Pin 17 | RC1 — Port C bit 1 / PPS remappable I/O |
| Pin 18 | RC2 — Port C bit 2 / PPS remappable I/O |
| Pin 19 | RC3 — Port C bit 3 / PPS remappable I/O |
| Pin 20 | RC4 — Port C bit 4 / PPS remappable I/O |
| Pin 21 | RC5 — Port C bit 5 / PPS remappable I/O |
| Pin 22 | RC6 — Port C bit 6 / PPS remappable I/O |
| Pin 23 | RC7 — Port C bit 7 / PPS remappable I/O |
| Pin 24 | RC8 — Port C bit 8 / PPS remappable I/O |
| Pin 25 | RC9 — Port C bit 9 / PPS remappable I/O |
| Pin 26 | OSC1 — Crystal oscillator input |
| Pin 27 | OSC2 — Crystal oscillator output |
| Pin 28 | AVDD — Analog positive supply (separate from VDD) |
Typical Applications
PIC32MM0256GPM028T-I/SS is suitable for 6 applications: USB HID Peripheral Devices, IoT Sensor Hubs, Consumer Electronics Controllers, Industrial Sensor Interfaces, Battery-Powered Wearable Devices, Human-Machine Interface (HMI) Controllers.
USB HID Peripheral Devices
The PIC32MM0256GPM028T-I/SS is well-suited for USB HID-class peripherals because it integrates USB 2.0 Full-Speed Device hardware, eliminating the need for an external PHY. The 256 KB ECC Flash accommodates HID descriptor tables plus application firmware, while the 25 MHz MIPS32 microAptiv core provides ample headroom for HID report processing. At a typical USB HID duty cycle, the MCU draws low active current and drops to sub-µA sleep when the host suspends the bus, helping products meet USB-IF suspend-current requirements.
Recommended
IoT Sensor Hubs
For IoT sensor hubs aggregating temperature, humidity, and motion data, the PIC32MM0256GPM028T-I/SS offers 21 GPIO pins for direct sensor attachment plus I2C/SPI/UART for digital sensors. Its 256 KB Flash holds protocol stacks such as MQTT-SN or BLE HCI while ECC prevents bit rot over multi-year deployments. The MIPS32 microAptiv core runs idle modes at sub-1 µA, extending battery life in wireless sensor nodes that spend most of their life in sleep.
Recommended
Consumer Electronics Controllers
Consumer devices such as remote controls, toys, and small appliances benefit from the PIC32MM0256GPM028T-I/SS 28-SSOP form factor for hand-repair-friendly designs. The 256 KB Flash stores localized UI strings and sound effects, while the 12-bit ADC reads potentiometers and battery voltage. USB on-chip simplifies firmware-update tools, and the -40C to +85C industrial range covers indoor and mild-outdoor consumer use cases.
Recommended
Industrial Sensor Interfaces
Industrial sensor-interface modules leverage the PIC32MM0256GPM028T-I/SS 2.0-3.6 V supply range and 12-bit ADC for 4-20 mA loop digitization. The 256 KB Flash accommodates Modbus RTU or custom protocol stacks, while ECC Flash ensures long-term data retention in factory-floor environments. PPS pin mapping simplifies routing of UART, SPI, and I2C to isolated RS-485 transceivers and digital isolators.
Recommended
Battery-Powered Wearable Devices
Wearable bands, fitness trackers, and medical patches benefit from the PIC32MM0256GPM028T-I/SS deep-sleep modes that drop current consumption to sub-1 µA between sensor readings. The 256 KB Flash stores firmware plus BLE HCI command libraries, and the 32 KB SRAM holds sensor fusion buffers. USB on-chip allows convenient in-box charging cables without an extra IC, reducing BOM area in space-constrained wristbands.
Recommended
Human-Machine Interface (HMI) Controllers
Small HMI panels for appliances and building automation use the PIC32MM0256GPM028T-I/SS to drive LCDs, scan keypads, and run simple graphics libraries. The 25 MHz MIPS32 core handles routine UI rendering, and the 256 KB Flash fits touch libraries, fonts, and multilingual strings. With 21 GPIO and PPS, designers route SPI displays, I2C touch controllers, and PWM backlight drivers without bus contention.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MM0256GPM028T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MM0256GPM028-I/SS | PIC32MM0128GPM028T-I/ML |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SSOP (same) | 28-QFN (different) |
| Core Architecture | MIPS32 microAptiv 32-bit | MIPS32 microAptiv 32-bit | MIPS32 microAptiv 32-bit |
| Maximum CPU Speed | 25 MHz | 25 MHz | 25 MHz |
| Flash Memory | 256 KB | 256 KB | 128 KB |
| SRAM | 32 KB | 32 KB | 32 KB |
| USB | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device |
| Operating Voltage | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V |
Key Differentiators
- Integrated USB 2.0 Full-Speed Device with on-chip transceiver (vs PIC32MX1xx/2xx (no USB in same package))
- Sub-1 µA deep-sleep current with RTC running (vs PIC32MX (sleep currents typically 20-30 µA))
- 256 KB ECC Flash for reliable code storage (vs PIC32MX (no ECC option in similar density))
Design Notes
Place a 100 nF ceramic decoupling capacitor as close as possible to each VDD pin (pins 9 and 28) plus a bulk 4.7 µF capacitor near the supply entry point. For USB operation, VDD must remain above 3.0 V to keep the on-chip USB transceiver in regulation. Use a low-dropout regulator such as MCP1700 for 3.3 V rails to maximize efficiency at light loads.
Route the USB D+ (pin 7 alt) and D- (pin 6 alt) signals as a 90 Ω differential pair with length matching within 150 mil. Keep the pair away from switching signals such as PWM or oscillator traces. Maintain a continuous ground plane beneath the USB traces for controlled impedance and EMI suppression. Per Microchip USB design guides, a series 27 Ω termination resistor on each line improves signal integrity at full-speed edges.
Do not assume default PPS mappings carry over between PIC32MM GPM sub-families - always reconfigure PPS registers at startup to match your board layout. The MCLR pin (pin 1) must have a pull-up resistor (typically 10 kΩ) to VDD for reliable reset behavior. For low-power sleep modes, configure all unused pins as digital outputs driving low to minimize current leakage, and disable unused peripherals via the PMD register set.
Compliance Information
RoHS and REACH compliance per Microchip product page; industrial temperature grade -40C to +85C (I-suffix); AEC-Q100 variants are not available in this part number.
