PIC32MX320F128L-80I/BG - 80MHz 32-bit MCU, 128KB Flash | Microchip
MPN: PIC32MX320F128L-80I/BG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.17 | $8.17 |
| 10 | $7.35 | $73.50 |
| 100 | $6.2 | $620.00 |
| 500 | $5.1 | $2,550.00 |
| 1,000 | $4.25 | $4,250.00 |
PIC32MX320F128L-80I/BG Overview
A 32-bit microcontroller (MCU) is a programmable processor core, memory, and peripheral set integrated into a single silicon die. Within the broader semiconductor hierarchy, MCUs sit under microprocessors (MP/MPU) but add on-chip Flash, RAM, timers, ADCs, and communication interfaces, making them self-contained compute subsystems. PIC32MX devices extend Microchip's legacy PIC16/PIC24 family into the MIPS32 domain, enabling 80 MHz performance with familiar MPLAB X toolchain support.
Key features of the PIC32MX320F128L include a 16-channel 10-bit Analog-to-Digital Converter (ADC) for mixed-signal acquisition, four DMA channels that offload CPU cycles during peripheral data transfers, and a rich set of serial interfaces: multiple UART/EUSART, I2C, and SPI ports. The device also provides five 16-bit timers/counters, configurable I/O, and a USB 2.0 full-speed On-The-Go peripheral on select die revisions, enabling direct USB device/host bridging without an external PHY.
Architecturally, the PIC32MX320F128L uses a Harvard-style 32-bit MIPS core with separate instruction and data buses feeding Flash and SRAM, providing deterministic interrupt latency and predictable execution. A peripheral bus matrix multiplexes ADC, I/O, and serial blocks, while a bus master DMA engine can move data between peripherals and RAM independently of the CPU. The 121-ball TFBGA exposes the full pinout, including extended I/O and parallel bus options that the smaller 64/100-pin variants omit.
Typical applications include USB peripherals such as HID-class input devices and CDC serial bridges, industrial sensor hubs that aggregate multiple analog and digital channels via DMA, graphical user interfaces with parallel bus displays, and embedded connectivity nodes combining UART, SPI, and I2C peripherals. The wide combination of FFT-friendly MIPS performance and abundant peripherals makes it a fit for low-cost audio processing, motor-control feedback loops, and protocol bridges.
When laying out a board, allocate a 10x10 mm BGA land pattern with 0.8 mm pitch fan-out and route differential USB DP/DM pairs with 90 ohm impedance matching. Decouple each VDD/AVDD pin with a 100 nF ceramic capacitor placed within 2 mm of the ball, and add a 4.7 uF bulk capacitor near the regulator output. The 'I' suffix denotes industrial temperature range, while the trailing 'BG' designates the 121-ball TFBGA package, distinguishing it from pin-compatible QFP variants in the same die family.
This page synthesizes distributor pricing, drop-in same-package alternatives, and application guidance that goes beyond the manufacturer datasheet, equipping engineers with selection and sourcing context not always visible on standard distributor pages.
Drop-in alternatives for PIC32MX320F128L-80I/BG — 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 PIC32MX320F128L-80I/BG (same form factor and footprint) — differing in ADC, DMA Channels, Operating Temperature, Package, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX320F128LT-80I/BG
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX320F128L-80V/BG
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC32MX320F128L-80I/BG Maximum Ratings & Electrical Characteristics
| Core | MIPS32 M4K 32-bit RISC |
| Maximum CPU Speed | 80 MHz |
| Program Memory (Flash) | 128 KB (128K x 8) |
| Data SRAM | 32 KB |
| Operating Voltage Range | 2.3 V to 3.6 V |
| ADC | 10-bit, 16-channel |
| DMA Channels | 4 |
| Timers | 5 x 16-bit |
| Communication Interfaces | UART, SPI, I2C, USB 2.0 FS OTG |
| Package | 121-ball TFBGA (BG), 10x10 mm |
| Operating Temperature | -40C to +85C (industrial, I suffix) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Architecture | Harvard, separate instruction/data buses |
| Speed Grade Suffix | 80 (80 MHz) |
PIC32MX320F128L-80I/BG Pin Configuration
| Pin A1 | VSS — Ground reference |
| Pin A2 | OSC1/CLKI — Crystal oscillator input or external clock input |
| Pin B1 | VDD — I/O supply voltage (2.3V-3.6V) |
| Pin B2 | OSC2/CLKO — Crystal oscillator output |
| Pin C1 | PMD0 — Parallel Master Port data bit 0 |
| Pin C2 | PMD1 — Parallel Master Port data bit 1 |
| Pin D1 | PMD2 — Parallel Master Port data bit 2 |
| Pin D2 | PMD3 — Parallel Master Port data bit 3 |
| Pin E1 | PMD4 — Parallel Master Port data bit 4 |
| Pin E2 | PMD5 — Parallel Master Port data bit 5 |
| Pin F1 | PMD6 — Parallel Master Port data bit 6 |
| Pin F2 | PMD7 — Parallel Master Port data bit 7 |
| Pin G1 | PMALL/PMA0 — Parallel Master Port address latch low or address bit 0 |
| Pin G2 | PMALH/PMA1 — Parallel Master Port address latch high or address bit 1 |
| Pin H1 | USBDP — USB D+ differential data line |
| Pin H2 | USBDM — USB D- differential data line |
| Pin J1 | VUSB — USB transceiver supply (3.3V) |
| Pin J2 | VBUS — USB bus voltage detect input |
Typical Applications
PIC32MX320F128L-80I/BG is suitable for 7 applications: USB Human Interface Device (HID), Industrial Sensor Hub, Graphical User Interface (GUI) Controller, Audio Processing and Effects, Motor Control Feedback Loop, IoT Protocol Bridge and Connectivity Node, Battery-Powered Data Logger.
USB Human Interface Device (HID)
The PIC32MX320F128L-80I/BG fits USB HID designs because its integrated USB 2.0 full-speed On-The-Go controller with internal transceiver eliminates the external PHY and simplifies the BOM. The 32 KB SRAM comfortably holds HID report buffers, while the 80 MHz MIPS core executes the USB polling state machine at 1 ms intervals without CPU bottleneck. Compared to external USB-to-UART bridges, this on-chip USB reduces board area, BOM cost, and firmware stack complexity for keyboards, gamepads, and custom input devices that pair with PC or embedded hosts.
Recommended
Industrial Sensor Hub
The PIC32MX320F128L-80I/BG suits industrial sensor hubs because its 16-channel 10-bit ADC aggregates thermocouple, current-sense, and voltage-divider signals across multiple sensor inputs without external analog multiplexers. The four DMA channels autonomously move ADC samples into RAM buffers, freeing the 80 MHz MIPS core for filtering, calibration, and Modbus or I2C reporting. Compared to discrete MCU+ADC designs, this integrated ADC+MCU combination delivers deterministic sampling at industrial -40C to +85C operating temperatures for process monitoring and factory automation nodes.
Recommended
Graphical User Interface (GUI) Controller
The PIC32MX320F128L-80I/BG is a fit for parallel-graphical-display GUIs because the 121-ball TFBGA exposes the full PMP (Parallel Master Port) interface, driving TFT panels with 8-bit or 16-bit data buses plus control signals for write strobe and chip enable. The 32 KB SRAM holds frame buffers for small 320x240 QVGA displays, and the 80 MHz MIPS core renders bitmaps, fonts, and 2D primitives at acceptable frame rates. Compared to SPI-only MCU designs, this parallel PMP bus eliminates SPI bandwidth bottlenecks for richer user interfaces in industrial HMIs and appliance control panels.
Recommended
Audio Processing and Effects
The PIC32MX320F128L-80I/BG fits entry-level audio processing because the 80 MHz MIPS32 M4K core executes DSP primitives such as FIR filters, FFT, and biquad IIR stages at 48 kHz sample rates with low MIPS overhead. The I2S or SPI interface streams samples from external codecs, while the 32 KB SRAM stores coefficient tables and circular sample buffers. Compared to fixed-function audio ICs, the PIC32 variant enables customizable EQ, reverb, and dynamics processing for musical instruments, mixers, and consumer audio accessories at low BOM cost.
Recommended
Motor Control Feedback Loop
The PIC32MX320F128L-80I/BG is appropriate for motor control feedback loops because its 16-channel 10-bit ADC samples back-EMF, phase current, and position sensors at deterministic intervals, while the five 16-bit timers drive PWM channels for closed-loop commutation. The 80 MHz MIPS core executes PI or FOC control algorithms within microseconds of ADC conversion complete interrupts. Compared to analog motor controllers, the PIC32 variant enables software-tunable acceleration curves for BLDC, stepper, and DC motors in robotics and small appliances.
Recommended
IoT Protocol Bridge and Connectivity Node
The PIC32MX320F128L-80I/BG fits IoT protocol bridge applications because the multiple UART/EUSART, SPI, and I2C interfaces aggregate Modbus, RS-485, I2C sensors, and SPI peripherals into a single coordination point. The 80 MHz MIPS core runs Modbus master/slave, MQTT-SN, or proprietary protocols with TLS-like encryption in software. Compared to single-interface MCUs, this multi-protocol connectivity enables gateway designs that translate between industrial field buses and Ethernet/USB backhaul in building automation and remote monitoring nodes.
Recommended
Battery-Powered Data Logger
The PIC32MX320F128L-80I/BG suits battery-powered data loggers because its 2.3 V to 3.6 V supply range supports direct Li-ion or 2xAA battery operation, and the multiple sleep modes plus DMA-driven ADC acquisition wake the core only when samples are ready. The 32 KB SRAM stores circular sample buffers during sleep periods, while the 128 KB Flash holds logging firmware and lookup tables. Compared to always-on MCUs, the PIC32 variant extends runtime to months on small batteries for remote environmental monitoring, asset tracking, and cold-chain logging.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX320F128L-80I/BG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX320F128LT-80I/BG | PIC32MX320F128L-80V/BG | PIC32MX274F256DT-I/PT | PIC32MX270F512L-V/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 121-ball TFBGA (BG) 10x10 mm | 121-ball TFBGA (BG) - same | 121-ball TFBGA (BG) - same | 100-pin TQFP (PT) | 44-pin TQFP (DT) |
| Core | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit |
| Maximum CPU Speed | 80 MHz | 80 MHz | 80 MHz | 72 MHz | 50 MHz |
| Flash Memory | 128 KB | 128 KB | 128 KB | 256 KB | 512 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 64 KB | 64 KB |
| ADC Resolution | 10-bit | 10-bit | 10-bit | 12-bit | 10-bit |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +105C | -40C to +85C | -40C to +105C |
Key Differentiators
- Highest pin count for the PIC32MX320F128L die (vs PIC32MX320F128H-80I/BG)
- Wide industrial temperature range (vs PIC32MX320F128L-80V/BG)
- USB 2.0 OTG with internal transceiver (vs PIC32MX230F128L-I/PF)
Design Notes
Estimated: The 121-ball TFBGA at 0.8 mm pitch requires a 4-layer PCB minimum for via-in-pad or dog-bone fan-out. Place 100 nF decoupling capacitors within 2 mm of every VDD/AVDD ball, and add a 4.7 uF bulk capacitor near the regulator output. Route the USB DP/DM pair as a 90 ohm differential line with matched impedance and a guard ground on both sides. Exposed die paddle balls on the TFBGA must be soldered to a continuous ground pour for thermal dissipation.
The PIC32MX320F128L-80I/BG accepts 2.3 V to 3.6 V on VDD per the Microchip datasheet 61143H. The on-chip voltage regulator generates the 1.8 V core voltage internally. Connect VDD and AVDD together at the supply output with separate ferrite beads to isolate analog and digital noise. Use a low-dropout regulator such as MCP1700 with 250 mA peak current capability to handle USB enumeration bursts and DMA-driven peripheral activity without voltage droop.
Route the 80 MHz system clock trace as a short, impedance-controlled path from the crystal or oscillator to the OSC1/OSC2 balls. Place the crystal within 5 mm of the MCU to minimize parasitic capacitance and ringing. Use a guard GND ring around the crystal to reduce EMI coupling to nearby analog traces. For USB signals, route DP/DM as a 90 ohm differential pair with continuous GND reference plane beneath; avoid splits or voids that degrade signal integrity at 12 Mbps full-speed USB.
Estimated: Common pitfalls when designing with the PIC32MX320F128L-80I/BG include exceeding the 3.6 V absolute maximum on any I/O ball during hot-plug events, omitting the VBUS detect resistor on USB applications, and leaving unused I/O as floating inputs that draw switching current. Configure unused I/O as digital outputs driven low. The BGA package is sensitive to moisture; observe MSL-3 floor-life of 168 hours and bake at 125C for 24 hours before assembly if exposure is exceeded.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified; choose PIC32MX variants in AEC-Q100 grade for automotive. Halogen-free status unknown from verified data.
