PIC24FJ32GU202-I/ML - 16-bit USB MCU 32KB Flash 28-QFN | Microchip
MPN: PIC24FJ32GU202-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.85 | $3.85 |
| 10 | $3.61 | $36.10 |
| 100 | $3.18 | $318.00 |
| 500 | $2.74 | $1,370.00 |
| 1,000 | $2.41 | $2,410.00 |
PIC24FJ32GU202-I/ML Overview
A 16-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (Flash/RAM), and peripherals on one silicon die. PIC24F devices use a 16-bit modified Harvard RISC architecture with a 24-bit instruction word, sitting in the hierarchy between 8-bit PIC16/PIC18 MCUs and 32-bit PIC32MX/ARM Cortex-M parts. The PIC24FJ32GU202 belongs to the broader category of embedded microcontrollers, which are the foundational building blocks of modern electronic systems, responsible for executing firmware that controls sensors, communication interfaces, displays, and actuators.
The PIC24FJ32GU202 integrates several features that differentiate it within the PIC24FJ family: an integrated USB 2.0 Full-Speed transceiver supporting Host, Device, and OTG roles (a rare combination at this pin count), four 16-bit timers, a 10-bit ADC with up to 9 channels, multiple serial interfaces (UART, SPI, I2C), and a chargeable RTCC. Its eXLP (Extreme Low Power) design includes multiple low-power operating modes, deep sleep with RTCC retention drawing only hundreds of nA, and a peripherals-only mode that keeps CIPs running while the CPU sleeps.
Typical applications include USB peripherals (HID, CDC, MSD class devices), wearable health and fitness sensors, battery-powered IoT end nodes with USB charging, low-power sensor hubs, industrial data loggers, and consumer devices that need a single MCU to handle both USB connectivity and low standby power. The 28-QFN package provides 20 usable I/O pins and is footprint-compatible with other PIC24FJ32GU2-series parts, allowing easy migration between memory sizes within the family.
When designing with this part, plan for the integrated USB PHY's 48 MHz clock requirement: either use the internal PLL with an external 8 MHz crystal, or provide an external 48 MHz source. The CIPs (Core Independent Peripherals) such as the 16-bit PWM and configurable logic cells can offload tasks from the CPU, reducing firmware complexity and active time. Vcap pin decoupling per datasheet recommendations is required for core regulator stability.
Drop-in alternatives for PIC24FJ32GU202-I/ML — 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 PIC24FJ32GU202-I/ML (same form factor and footprint) — differing in Core Architecture, Package, ADC, Timers, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC24FJ32GU202-E/ML
✅ Drop-In✓ In Stock
$2.49 / Unit
View Datasheet →PIC24FJ64GU202-I/ML
✅ Drop-In✓ In Stock
$2.52 / Unit
View Datasheet →PIC24FJ32GP202-I/SS
✅ Drop-In✓ In Stock
$2.62 / Unit
View Datasheet →PIC24FJ32GA102-I/SO
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC24FJ32GU202-I/ML Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC24F 16-bit RISC |
| Program Memory | 32 KB (11K x 24 words) ECC Flash |
| Data Memory (RAM) | 8 KB |
| Maximum CPU Speed | 32 MHz (16 MIPS) |
| Operating Voltage | 2.0 V to 3.6 V |
| USB Interface | USB 2.0 Full-Speed Host/Device/OTG (integrated transceiver) |
| I/O Pins | 20 |
| ADC | 10-bit, up to 9 channels |
| Timers | 4 x 16-bit |
| Communication Interfaces | UART, SPI, I2C |
| Package | 28-QFN (6x6 mm) |
| Operating Temperature | -40C to +85C (Industrial -I grade) |
| Mounting Type | Surface Mount |
| MSL Level | MSL1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
PIC24FJ32GU202-I/ML Pin Configuration
| Pin 1 | VDD — Positive supply voltage (2.0V to 3.6V) |
| Pin 2 | OSCI — Oscillator crystal input (or external clock) |
| Pin 3 | OSCO — Oscillator crystal output |
| Pin 4 | RA0 — GPIO / analog input / comparator output |
| Pin 5 | RA1 — GPIO / analog input / VREF+ |
| Pin 6 | RA2 — GPIO / analog input / VREF- |
| Pin 7 | RA3 — GPIO / analog input |
| Pin 8 | VUSB — USB 3.3V regulator output (from VBUS) |
| Pin 9 | D+ — USB data plus |
| Pin 10 | D- — USB data minus |
| Pin 11 | VSS — Ground reference |
| Pin 12 | VCAP — Internal voltage-regulator filter capacitor |
| Pin 13 | RB0 — GPIO / analog input / PGC (ICSP clock) |
| Pin 14 | RB1 — GPIO / analog input / PGD (ICSP data) |
| Pin 15 | RB2 — GPIO / analog input |
| Pin 16 | RB3 — GPIO / analog input |
| Pin 17 | RB4 — GPIO / SDA1 (I2C data) |
| Pin 18 | RB5 — GPIO / SCL1 (I2C clock) |
| Pin 19 | RB6 — GPIO / ICSPCLK |
| Pin 20 | RB7 — GPIO / ICSPDAT |
| Pin 21 | RA4 — GPIO / analog input / SOSCO (RTCC secondary) |
| Pin 22 | RA5 — GPIO / analog input / SOSCI (RTCC secondary) |
| Pin 23 | RC0 — GPIO |
| Pin 24 | RC1 — GPIO |
| Pin 25 | RC2 — GPIO |
| Pin 26 | RC3 — GPIO |
| Pin 27 | RC4 — GPIO |
| Pin 28 | VSS — Ground reference (thermal pad) |
Typical Applications
PIC24FJ32GU202-I/ML is suitable for 8 applications: USB HID Peripherals, USB CDC Serial Bridges, Battery-Powered Wearable Sensors, Low-Power IoT Sensor Hubs, USB Mass Storage Devices, Industrial Data Loggers, USB Charging Controllers with MCU Logic, Consumer USB Audio Accessories.
USB HID Peripherals
The PIC24FJ32GU202-I/ML is purpose-built for USB Human Interface Devices such as keyboards, mice, game controllers, and custom input peripherals. Its integrated USB 2.0 Full-Speed transceiver eliminates the need for an external PHY, reducing BOM count and freeing board space. The 32 KB ECC Flash accommodates USB HID class drivers and custom firmware, while 8 KB of RAM handles HID report buffers and USB endpoint RAM. The 16 MIPS performance comfortably supports USB 1 ms polling intervals even with debounce, scanning, and HID descriptor processing. The 28-QFN package fits inside compact peripherals. Compared to MCUs that require external USB chips, this part saves $0.50-$1.00 in BOM and simplifies FCC/EMC certification by minimizing high-speed trace length.
Recommended
USB CDC Serial Bridges
The PIC24FJ32GU202-I/ML serves as a USB-to-UART bridge (CDC ACM class device) for industrial diagnostic ports, IoT debug channels, and legacy serial-cable replacement. The integrated USB transceiver combined with two UART peripherals enables transparent 115200+ baud bridging with no external crystal beyond the 8 MHz USB reference clock. The 32 KB Flash holds Microchip's USB CDC stack plus application code; 8 KB RAM comfortably buffers bidirectional serial streams. The eXLP sleep modes allow the device to enter deep sleep between data bursts while preserving the USB enumeration state, drawing under 1 mA idle. Compared to FT232-class bridges, this part is firmware-upgradable and integrates a 16-bit MCU for custom protocol extensions.
Recommended
Battery-Powered Wearable Sensors
The PIC24FJ32GU202-I/ML suits wearable health and fitness sensors that need USB charging connectivity plus multi-year battery life. Its eXtreme Low Power design provides deep-sleep currents of a few hundred nanoamps with full RTCC and SRAM retention, allowing the device to wake only on sensor events while keeping the calendar clock running. The integrated USB OTG controller supports both charging (Device mode) and peer-to-peer data sync (Host/OTG mode). The 10-bit ADC handles temperature, heart-rate, and motion-sensor front-ends. The 28-QFN 6x6 mm footprint fits inside wristbands and patches. Compared to Cortex-M0+ alternatives, this part trades software ecosystem maturity for superior low-power figures and integrated USB.
Recommended
Low-Power IoT Sensor Hubs
The PIC24FJ32GU202-I/ML works as a USB-attached IoT sensor hub that aggregates I2C/SPI sensor data and streams it over USB. The two I2C and two SPI peripherals handle multi-sensor buses, while the UART provides wired-network fallback. The 32 KB Flash and 8 KB RAM can buffer thousands of sensor samples before USB upload. The Core Independent Peripherals (CIPs) such as the 16-bit PWM and configurable logic cells run autonomously, reducing CPU wake time and extending battery life in battery-backed hubs. Compared to software-driven sensor polling, the CIP integration cuts average active time and reduces firmware complexity.
Recommended
USB Mass Storage Devices
The PIC24FJ32GU202-I/ML supports USB Mass Storage Class (MSD) implementations such as card readers, USB thumb drives, and data-logger playback devices when paired with an external SD card or Flash IC over SPI. The integrated USB Full-Speed transceiver delivers 12 Mbps throughput, sufficient for legacy USB 2.0 flash drives. The 8 KB RAM handles FAT sector buffers while 32 KB Flash holds the USB MSD stack and FAT16/32 file system. The 28-QFN footprint allows compact card-reader form factors. Compared to dedicated USB controllers, this part adds an MCU for application logic such as data encryption or sensor pre-processing.
Recommended
Industrial Data Loggers
The PIC24FJ32GU202-I/ML is a strong fit for compact industrial data loggers with USB download capability for process control, building automation, and equipment-monitoring applications. The -40C to +85C industrial temperature grade handles factory-floor environments. The 10-bit ADC with up to 9 channels reads thermocouples (with external conditioning), 4-20 mA loops, and digital sensors. The RTCC provides timestamped logging even in deep-sleep retention mode. The integrated USB Full-Speed allows field engineers to retrieve logs without removing the SD card. Compared to USB-less loggers that need an external programmer, this part reduces field-service time and tooling cost.
Recommended
USB Charging Controllers with MCU Logic
The PIC24FJ32GU202-I/ML can serve as a smart USB charging controller for single-cell Li-ion/Li-poly packs, adding charger-status display, button-debounce, fuel-gauge interfacing, and user-interface logic beyond what standalone charger ICs provide. The integrated USB transceiver detects plug-in events and enumerates as either a charger (dumb) or a CDC device (smart). The 32 KB Flash holds a custom charging algorithm; 8 KB RAM supports display buffering for OLED/LCD readouts. The eXLP sleep modes minimize standby drain during long storage. Compared to discrete charger ICs, this part offers programmable charging profiles, status LEDs, and field-updatable firmware.
Recommended
Consumer USB Audio Accessories
The PIC24FJ32GU202-I/ML suits USB audio accessories such as USB speakers, headsets, and DAC dongles where a microcontroller handles HID volume controls, button events, and USB enumeration while an external audio DAC handles the analog path. The integrated USB Full-Speed supports USB Audio Class 1.0 (1-channel 16-bit at up to 48 kHz mono) or HID-class volume-control streams. The two UART peripherals can drive Bluetooth SPP/HID modules for wireless variants. The 28-QFN package fits into dongle form factors. Compared to USB audio-only controllers, this part adds general-purpose MCU I/O for status LEDs and buttons.
Recommended
Recommended Products Summary
Engineering reference data for PIC24FJ32GU202-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC24FJ32GU202-E/ML | PIC24FJ64GU202-I/ML | PIC24FJ32GP202-I/SS | PIC24FJ32GA102-I/SO |
|---|---|---|---|---|---|
| Package | 28-QFN (6x6) | 28-QFN (6x6) - same | 28-QFN (6x6) - same | 28-SSOP | 28-SOIC |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 32 KB | 32 KB | 64 KB | 32 KB | 32 KB |
| Data RAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| USB 2.0 Full-Speed | Yes (Host/Device/OTG) | Yes (Host/Device/OTG) | Yes (Host/Device/OTG) | No | No |
| Operating Temperature | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +85C | -40C to +85C |
| Maximum Clock Speed | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) | 32 MHz (16 MIPS) |
| Operating Voltage | 2.0V to 3.6V | 2.0V to 3.6V | 2.0V to 3.6V | 2.0V to 3.6V | 2.0V to 3.6V |
| ADC | 10-bit, 9 channels | 10-bit, 9 channels | 10-bit, 9 channels | 10-bit, 9 channels | 10-bit, 10 channels |
| Qty-1 Price (USD) | 3.85 | 4.12 | 4.45 | 3.42 | 3.36 |
Key Differentiators
- Integrated USB 2.0 Full-Speed Host/Device/OTG on-chip (vs PIC24FJ32GP202-I/SS)
- 28-QFN package with 32 KB Flash - smallest footprint in GU2 family (vs PIC24FJ64GU202-I/ML)
- eXtreme Low Power (XLP) with sub-uA deep-sleep current (vs PIC24FJ32GA102-I/SO)
- ECC Flash for single-bit error correction (vs PIC24FJ32GP202-I/SS)
Design Notes
The integrated USB transceiver requires the VUSB pin to be decoupled with a 0.1 uF ceramic capacitor, and the internal 3.3V USB regulator must see a clean VBUS-derived rail. Estimated: at 2.0V VDD with 32 MHz active CPU, the core draws approximately 15 mA; deep-sleep with RTCC retention drops to ~200 nA per Microchip datasheet typical characteristics. A bulk 10 uF + 0.1 uF VDD bypass pair is required near pins 1 and 11.
USB D+ and D- traces on the PCB must be routed as a 90-ohm differential pair with length matching within 150 mil to meet USB 2.0 Full-Speed signal-integrity requirements. The 28-QFN exposed thermal pad (pin 28 / VSS) must be soldered to a continuous ground pour with at least four thermal vias for heat dissipation. Place the 8 MHz crystal and its load capacitors within 5 mm of the OSCI/OSCO pins to avoid oscillator start-up issues.
Do not power the device from VBUS directly without enabling the internal USB regulator, or the USB D+/D- lines will be back-powered and fail USB compliance. The VCAP pin requires a low-ESR 10 uF ceramic capacitor; using a tantalum or electrolytic can cause core regulator instability and erratic resets. For USB Host mode, an external 5V VBUS switch is required - the integrated PHY cannot source 5V to downstream devices.
The PIC24FJ32GU202-I/ML's 16 MIPS performance is sufficient for USB Full-Speed 12 Mbps but the CPU is too slow for software-implemented USB High-Speed - do not attempt Hi-Speed enumeration. The ADC's 10-bit ENOB at full 32 MHz conversion rate requires a clean analog supply; place a ferrite bead between VDD and AVDD (if used) to isolate digital switching noise from analog references.
Estimated: at maximum 32 MHz active mode and 3.6V supply, power dissipation is approximately 50 mW, well within the 28-QFN's 1-W thermal envelope even without a heatsink. In USB suspend mode, the device still consumes ~2.5 mA to maintain USB connection monitoring; for ultra-low standby designs, gate VBUS with an external load switch and use the PIC's wake-on-attach interrupt.
Compliance Information
RoHS/REACH compliant per Microchip product environmental compliance index. Not AEC-Q100 qualified - use PIC24FJ32GA310/GB410 AEC-Q100 variants for automotive.
