PIC32MX320F064HT-40I/MR - 32-bit MCU, 64KB Flash, 40MHz, VQFN-64 | Microchip
MPN: PIC32MX320F064HT-40I/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.8968 | $5.90 |
PIC32MX320F064HT-40I/MR Overview
A PIC32MX3xx/4xx microcontroller belongs to the MIPS M4K 32-bit MCU family from the larger RISC microcontroller category of embedded microcontrollers, which are integrated circuits that combine a CPU core, program memory, RAM, and configurable peripherals on a single die. These 32-bit parts are typically used in industrial control, USB connectivity, graphical user interfaces, and audio processing - where they provide a substantial performance increase and address space over 8-bit and 16-bit predecessors while keeping C-friendly development tools and a familiar MPLAB ecosystem.
Key features of this device include 64 KB single-cycle Flash, 16 KB SRAM, 40 MHz / 50 DMIPS core, hardware multiply/divide, 16-channel 10-bit 500 ksps ADC, two I2C, two UART, two SPI, USB 2.0 full-speed device/host/OTG, 53 general-purpose I/O, CTMU touch support, RTCC, five 16-bit timers, and a parallel master port for graphics or external memory. The 64-pin VQFN (9x9 mm) footprint exposes up to 53 I/O and four dedicated high-drive pins for direct LED or MOSFET drive. The industrial temperature grade (-40C to +85C) makes it suitable for non-automotive harsh environments.
Architecturally, the PIC32MX320 is a Harvard-style MIPS32 core with separate instruction and data buses feeding unified SRAM via tightly-coupled prefetch modules. The Flash controller is dual-panel and supports runtime self-programming, enabling in-field firmware updates without external bootloader memory. A dedicated DMA engine with four channels can offload ADC and SPI transfers, freeing the CPU for application code and yielding deterministic interrupt latency.
Typical uses include internal household appliances, industrial automation HMI, USB peripherals (HID, CDC, mass storage), point-of-sale terminals, and low-cost audio processing. The combination of USB 4.0 OTG, 53 I/O, and graphics-capable PMP makes it a strong fit for color TFT panels and segmented LCDs up to 132 segments. Designers working in this room should budget parallel bus capacitance; PIC18C0 does not have a parallel bus-width buffer, so careful rail traffic-shaping is needed if powering both large blocks simultaneously.
When designing with this device, allocate a 1uF ETS-style bulk capacitor plus 100nF SPICE decoupling pair within 5 mm of every VDD/VSS pin pair, and use the exposed pad for robust peripheral connectivity. The CN/RB pins double as change-notification sources; leaving them floating at boot can cause spurious interrupts.
Drop-in alternatives for PIC32MX320F064HT-40I/MR — 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 PIC32MX320F064HT-40I/MR (same form factor and footprint) — differing in Package, ADC, Operating Temperature Range, Timers, DMA Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC32MX320F064H-40I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC32MX320F032HT-40I/MR
✅ Drop-In✓ In Stock
$3.78 / Unit
View Datasheet →PIC32MX270F512HT-50I/MR
✅ Drop-In✓ In Stock
$4.74 / Unit
View Datasheet →PIC32MX250F256HT-I/MR
✅ Drop-In✓ In Stock
$3.35 / Unit
View Datasheet →PIC32MX270F512HT-V/MR
✅ Drop-In✓ In Stock
$2.53 / Unit
View Datasheet →PIC32MX230F128H-50I/MR
✅ Drop-In✓ In Stock
$3.28 / Unit
View Datasheet →PIC32MX170F512HT-50I/PT
✅ Drop-In✓ In Stock
$4.32 / Unit
View Datasheet →PIC32MX320F064HT-40I/MR Maximum Ratings & Electrical Characteristics
| Core | MIPS32 M4K 32-bit RISC |
| CPU Speed | 40 MHz (up to 50 DMIPS) |
| Program Flash | 64 KB (64K x 8) |
| SRAM | 16 KB |
| Pin Count | 64 |
| Package | 64-VQFN (9x9 mm) with exposed thermal pad |
| Mounting Type | Surface Mount |
| Operating Voltage | 2.3 V to 3.6 V |
| Operating Temperature | -40C to +85C (Industrial) |
| ADC | 10-bit, up to 16 channels, 500 ksps |
| USB | USB 2.0 Full-Speed Device/Host/OTG |
| Communication Interfaces | 2x UART, 2x SPI, 2x I2C, PMP |
| Timers | 5x 16-bit timers |
| GPIO | 53 general-purpose I/O pins |
| DMA Channels | 4 |
| RoHS Status | Compliant |
| MSL Level | 3 (per JEDEC J-STD-020) |
| Lead-Free | Yes |
PIC32MX320F064HT-40I/MR 64-vqfn (9x9 mm) with exposed thermal pad Pin Configuration Guide
Pin configuration for PIC32MX320F064HT-40I/MR (64-vqfn (9x9 mm) with exposed thermal pad package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC32MX320F064HT-40I/MR.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC32MX320F064HT-40I/MR is suitable for 6 applications: USB HID Peripheral Device, Industrial Control HMI, USB CDC Virtual COM Port, Point-of-Sale Terminal, Low-Cost Audio Processing, Appliance Control Board.
USB HID Peripheral Device
The PIC32MX320F064HT-40I/MR is well-suited for USB Human Interface Device designs (keyboards, mice, game controllers, custom HID) thanks to its on-chip USB 2.0 full-speed controller and 53 general-purpose I/O pins for buttons, LEDs, and sensors. The 64 KB Flash comfortably fits Microchip's USB HID class driver plus application firmware, while the 16 KB SRAM accommodates USB endpoint buffers plus application data structures. Unlike external USB controller chips that require a separate SPI/UART interface, this part integrates the USB transceiver and PHY, reducing BOM by 3-5 components.
Recommended
Industrial Control HMI
The PIC32MX320F064HT-40I/MR is well-matched for industrial Human Machine Interface designs - control panel displays, status indicators, and operator interfaces - due to its parallel master port for driving graphical LCD or color TFT panels and 53 GPIO for switches, encoders, and indicator LEDs. The 40 MHz MIPS M4K core runs Microchip's Graphics Object Layer library for menu rendering, while the 16 KB SRAM holds display buffers. The industrial -40C to +85C temperature rating covers most factory-floor and outdoor enclosure environments without requiring expensive AEC-Q100 automotive-grade pricing.
Recommended
USB CDC Virtual COM Port
The PIC32MX320F064HT-40I/MR is ideal for USB Communications Device Class virtual COM port designs (USB-to-UART bridges, debug consoles, point-of-sale terminals) thanks to its on-chip USB 2.0 full-speed controller and dual UART peripherals. The 64 KB Flash accommodates Microchip's USB CDC class driver plus command-line parsing firmware, while the 16 KB SRAM handles USB endpoint buffers plus UART TX/RX FIFOs. Unlike external USB-to-UART bridges like FT232R, this part eliminates the BOM cost entirely, leaving only the USB connector and ESD protection.
Recommended
Point-of-Sale Terminal
The PIC32MX320F064HT-40I/MR is well-matched for point-of-sale terminal designs (barcode scanner interfaces, receipt printer controllers, customer display drivers) due to its USB host controller for barcode scanner attachment, parallel master port for receipt printer drive, and 53 GPIO for keypad scanning. The 40 MHz MIPS M4K core runs USB host stacks plus printer command interpreters with deterministic interrupt latency. The 64 KB Flash accommodates USB host class driver plus printer command library, and the industrial temperature grade suits indoor retail environments.
Recommended
Low-Cost Audio Processing
The PIC32MX320F064HT-40I/MR is suitable for low-cost audio processing applications (voice prompts, alarm sounders, audio playback devices, simple DSP filters) thanks to its 40 MHz MIPS M4K core capable of running audio processing algorithms at CD-quality sample rates, plus I2S audio interface support via SPI peripherals. The 16 KB SRAM holds audio sample buffers for short-to-music playback. Unlike dedicated audio DSP chips that lack USB, this part combines USB host/device audio class with general-purpose control on a single die.
Recommended
Appliance Control Board
The PIC32MX320F064HT-40I/MR is a strong fit for appliance control board designs (washing machine controllers, dishwasher control boards, refrigerator control boards, oven timers) thanks to its industrial -40C to +85C temperature rating, 53 GPIO for relays, switches, and sensors, and 10-bit ADC for temperature and analog sensor reading. The 40 MHz MIPS M4K core handles state-machine control plus diagnostic logging, while 64 KB Flash accommodates the appliance firmware plus bootloader for field updates. Unlike 8-bit MCU counterparts that require multiple chips for this peripheral mix, this part integrates everything on one die.
Recommended
Recommended Products Summary
Engineering reference data for PIC32MX320F064HT-40I/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC32MX320F064H-40I/MR | PIC32MX320F032HT-40I/MR | PIC32MX270F512HT-50I/MR |
|---|---|---|---|---|
| Package | VQFN-64 (9x9 mm) | VQFN-64 (9x9 mm) - same | VQFN-64 (9x9 mm) - same | VQFN-64 (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Core | MIPS32 M4K | MIPS32 M4K - same | MIPS32 M4K - same | MIPS32 M4K - same |
| CPU Speed | 40 MHz | 40 MHz | 40 MHz | 50 MHz |
| Flash | 64 KB | 64 KB | 32 KB (-50%) | 512 KB (+700%) |
| SRAM | 16 KB | 16 KB | 16 KB | 64 KB (+300%) |
| Operating Voltage | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V |
| Operating Temperature | -40C to +85C (I grade) | -40C to +85C (I grade) | -40C to +85C (I grade) | -40C to +85C (I grade) |
| USB | USB 2.0 FS OTG | USB 2.0 FS OTG | USB 2.0 FS OTG | USB 2.0 FS OTG/Host |
| GPIO | 53 | 53 | 53 | 53 |
| Unit Price (qty 1, approx.) | $5.90 | ~$5.50 | ~$4.85 | ~$6.80 |
Key Differentiators
- Same die as PIC32MX320F064H-40I/MR but ships in Tape and Reel (vs PIC32MX320F064H-40I/MR)
- 8x more Flash than PIC32MX320F032HT-40I/MR (vs PIC32MX320F032HT-40I/MR)
- Lower cost than PIC32MX270F512HT-50I/MR for non-performance-critical designs (vs PIC32MX270F512HT-50I/MR)
Design Notes
Place a 1uF bulk capacitor plus 100nF ceramic decoupling capacitor within 5 mm of every VDD/VSS pin pair. The PIC32MX320 has four VDD and four VSS pins (one pair per side of the VQFN); each pair requires its own local decoupling network per Microchip DS61143H. Without proper decoupling, USB signaling integrity will fail USB-IFC certification. Estimated: this assumes typical 0402 ceramic capacitors on a 4-layer PCB with ground plane directly under the VQFN exposed pad.
Solder the exposed thermal pad (EP) of the VQFN-64 to the PCB ground plane with at least 16 thermal vias (0.3 mm drill, 1mm pitch) connecting EP to internal ground planes. Without thermal vias, junction-to-ambient thermal resistance exceeds 50 C/W and the part may thermal-throttle during sustained USB transfers. The exposed pad is electrically connected to VSS internally; ensure ground-only connection to avoid ground loops.
Do not leave the 53 GPIO pins floating at boot - each GPIO defaults to analog input or high-impedance state and a floating input can source enough noise to cause spurious change-notification interrupts. Add 100k pull-down resistors to any unused GPIO pins, or configure them as digital outputs driving low in firmware before enabling CN interrupts. The CN/RB pins are most sensitive; mistransitions or floating CN inputs can cause interrupt storms within milliseconds of boot.
Route the 48 MHz USB clock trace as a 50-ohm controlled-impedance microstrip with continuous ground plane beneath, length-matched within 0.5 mm of the USB connector D+/D- traces. For full-speed USB 2.0, the D+/D- pair must be 90-ohm differential with 0.13 mm ratio, so keep the PCB stack-up and close, so careful PCB stack-up and shaping is needed if using both USB and high-speed signals simultaneously.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC32MX...-V or M series suffix parts for AEC-Q100 automotive qualification.
