PIC24FJ256GB108T-I/PT - 16-bit USB OTG MCU, 256KB Flash, 80-TQFP | Microchip
MPN: PIC24FJ256GB108T-I/PT ✓ Hoạt độngPIC24FJ256GB108T-I/PT Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), working memory (RAM), and a rich set of peripherals such as timers, communication controllers, ADC modules, and I/O. PIC24F devices sit between 8-bit PIC MCUs and 32-bit PIC32 parts in the Microchip portfolio, providing 16-bit data paths, deterministic interrupts, and low-power peripherals for cost-sensitive embedded designs. This particular part is a member of the PIC24FJ256GB1xx family, which adds a Full-Speed USB 2.0 OTG controller plus device/host/On-The-Go roles, making it a natural fit for USB peripherals and embedded hosts.
Key differentiating features include: USB 2.0 Full-Speed OTG (host + device + On-The-Go), 256 KB self-programmable Flash (85.5K x 24), 16 KB RAM, 8 MHz internal oscillator with 4x PLL providing 32 MHz operation, up to 16 MIPS throughput, multiple serial interfaces (up to 3x I2C, 3x SPI, 4x UART), and 23 independent timers. The industrial -40C to +85C operating range and 80-pin TQFP package support through-hole-style PCB assembly while exposing enough I/O for USB plus several communication buses simultaneously.
The PIC24FJ256GB1xx family uses a 16-bit RISC core with single-cycle execution for most instructions, a deterministic interrupt response, and peripheral pin select that decouples peripheral routing from physical pins. Internal RC and PLL features allow designers to drop external crystals in many applications, lowering BOM cost. The combination of USB OTG with substantial Flash and RAM enables firmware-only USB stacks without external memory.
Typical applications include USB peripherals (HID, CDC, mass storage, audio), USB-OTG embedded hosts (phone/tablet accessories, instrumentation), low-power industrial sensing nodes with USB diagnostic ports, consumer electronics with USB charging or data interfaces, and prototyping on the Explorer 16/32 development board using a Plug-In Module. The multiple UART/SPI/I2C instances also enable bridge/converter designs that route legacy buses to USB.
When laying out the PCB, route the D+/D- USB differential pair with 90 ohm differential impedance, place the VBUS pin protection components close to the connector, and provide a solid ground plane under the TQFP thermal pad region to assist thermal dissipation at industrial temperatures. Program Flash endurance is rated at typical values per the datasheet - if your firmware update pattern is aggressive, plan for wear.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not typically consolidated in the manufacturer datasheet, helping engineers shorten the part-selection and BOM-validation cycle for USB-capable 16-bit embedded designs.
Bộ thay thế dễ dàng lắp đặt cho PIC24FJ256GB108T-I/PT — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC24FJ256GB108T-I/PT (cùng hình factor và footprint) — khác nhau ở Timers, Package, Core Architecture, Operating Temperature, USB Interface.
PIC24FJ256GB108-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC24FJ192GB108T-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC24FJ256GA108T-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC24FJ128GB108T-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC24FJ256GB110T-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC24FJ256GB108T-I/PT Tỷ lệ tối đa & tính chất điện
| Manufacturer | Microchip Technology |
| Series | PIC24F |
| Core Architecture | PIC 16-bit RISC (modified Harvard) |
| Core Size | 16-bit |
| CPU Speed | 32 MHz (up to 16 MIPS) |
| Connectivity | I2C, SPI, UART, USB OTG |
| USB Interface | USB 2.0 Full-Speed OTG (Host + Device + OTG) |
| Number of I/O | 69 |
| Program Memory Size | 256 KB Flash (85.5K x 24) |
| Program Memory Type | Flash |
| RAM Size | 16 KB |
| Supply Voltage (Vcore) | 2.0 V to 3.6 V |
| Nhiệt độ hoạt động | -40C to +85C (Industrial, -I suffix) |
| Hộp | 80-TQFP (12x12 mm) |
| Kiểu lắp đặt | Surface Mount |
| Internal Oscillator | 8 MHz with 4x PLL option |
| Hardware Multiplier | 17-bit x 17-bit single-cycle |
| Hardware Divider | 16-bit |
| Timers | 23 independent timers |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC24FJ256GB108T-I/PT
| Chân 1 | RE8 — I/O port E bit 8 |
| Chân 2 | RE9 — I/O port E bit 9 |
| Chân 3 | RG6 — I/O port G bit 6 |
| Chân 4 | RG7 — I/O port G bit 7 |
| Chân 5 | RG8 — I/O port G bit 8 |
| Chân 6 | RG9 — I/O port G bit 9 |
| Chân 7 | MCLR — Master Clear (reset) input |
| Chân 8 | RG3 — I/O port G bit 3 |
| Chân 9 | RG2 — I/O port G bit 2 |
| Chân 10 | RG12 — I/O port G bit 12 |
| Chân 11 | RG13 — I/O port G bit 13 |
| Chân 12 | RG14 — I/O port G bit 14 |
| Chân 13 | RG15 — I/O port G bit 15 |
| Chân 14 | VDD — Positive supply voltage |
| Chân 15 | VSS — Ground reference |
| Chân 16 | RP15 — Remappable peripheral pin 15 |
| Chân 17 | RP14 — Remappable peripheral pin 14 |
| Chân 18 | RP13 — Remappable peripheral pin 13 |
| Chân 19 | RP12 — Remappable peripheral pin 12 |
| Chân 20 | RP11 — Remappable peripheral pin 11 |
| Chân 21 | RP10 — Remappable peripheral pin 10 |
| Chân 22 | RP9 — Remappable peripheral pin 9 |
| Chân 23 | RP8 — Remappable peripheral pin 8 |
| Chân 24 | RP7 — Remappable peripheral pin 7 |
| Chân 25 | RP6 — Remappable peripheral pin 6 |
| Chân 26 | RP5 — Remappable peripheral pin 5 |
| Chân 27 | RP4 — Remappable peripheral pin 4 |
| Chân 28 | RP3 — Remappable peripheral pin 3 |
| Chân 29 | RP2 — Remappable peripheral pin 2 |
| Chân 30 | RP1 — Remappable peripheral pin 1 |
| Chân 31 | RP0 — Remappable peripheral pin 0 |
| Chân 32 | VDD — Positive supply voltage |
| Chân 33 | VSS — Ground reference |
| Chân 34 | RC15 — I/O port C bit 15 |
| Chân 35 | RC14 — I/O port C bit 14 |
| Chân 36 | RC13 — I/O port C bit 13 |
| Chân 37 | RC12 — I/O port C bit 12 |
| Chân 38 | VBUS — USB VBUS sensing input (OTG) |
| Chân 39 | D+ — USB D+ data line |
| Chân 40 | D- — USB D- data line |
| Chân 41 | VDD — Positive supply voltage |
| Chân 42 | VSS — Ground reference |
| Chân 43 | RC1 — I/O port C bit 1 |
| Chân 44 | RC2 — I/O port C bit 2 |
| Chân 45 | RC3 — I/O port C bit 3 |
| Chân 46 | RC4 — I/O port C bit 4 |
| Chân 47 | RD8 — I/O port D bit 8 |
| Chân 48 | RD9 — I/O port D bit 9 |
| Chân 49 | RD10 — I/O port D bit 10 |
| Chân 50 | RD11 — I/O port D bit 11 |
| Chân 51 | RD0 — I/O port D bit 0 |
| Chân 52 | RD1 — I/O port D bit 1 |
| Chân 53 | RD2 — I/O port D bit 2 |
| Chân 54 | RD3 — I/O port D bit 3 |
| Chân 55 | RD4 — I/O port D bit 4 |
| Chân 56 | RD5 — I/O port D bit 5 |
| Chân 57 | RD6 — I/O port D bit 6 |
| Chân 58 | RD7 — I/O port D bit 7 |
| Chân 59 | RA9 — I/O port A bit 9 |
| Chân 60 | RA10 — I/O port A bit 10 |
| Chân 61 | RA11 — I/O port A bit 11 |
| Chân 62 | RA12 — I/O port A bit 12 |
| Chân 63 | RA13 — I/O port A bit 13 |
| Chân 64 | RA14 — I/O port A bit 14 |
| Chân 65 | RA15 — I/O port A bit 15 |
| Chân 66 | VSS — Ground reference |
| Chân 67 | VDD — Positive supply voltage |
| Chân 68 | RA0 — I/O port A bit 0 |
| Chân 69 | RA1 — I/O port A bit 1 |
| Chân 70 | RA2 — I/O port A bit 2 |
| Chân 71 | RA3 — I/O port A bit 3 |
| Chân 72 | RB0 — I/O port B bit 0 |
| Chân 73 | RB1 — I/O port B bit 1 |
| Chân 74 | RB2 — I/O port B bit 2 |
| Chân 75 | RB3 — I/O port B bit 3 |
| Chân 76 | RB4 — I/O port B bit 4 |
| Chân 77 | RB5 — I/O port B bit 5 |
| Chân 78 | RB6 — I/O port B bit 6 |
| Chân 79 | RB7 — I/O port B bit 7 |
| Chân 80 | RB8 — I/O port B bit 8 |
Ứng dụng tiêu biểu
PIC24FJ256GB108T-I/PT phù hợp cho 6 Áp dụngs: USB HID Peripheral Device, USB CDC Serial Bridge, Embedded USB Host Data Logger, USB OTG Dual-Role Accessory, Industrial Sensor Node with USB Diagnostics, Consumer Audio USB Accessory.
USB HID Peripheral Device
The PIC24FJ256GB108T-I/PT's USB 2.0 Full-Speed OTG controller in device mode plus 256 KB Flash comfortably fits a USB HID stack alongside application logic. With 16 MIPS throughput, the CPU handles HID report synthesis, debouncing, and command parsing in real time. The 80-TQFP pin count exposes ample I/O for keyboards, mice, or custom HID controls without external bus expanders. According to the Microchip USB framework, the integrated transceiver eliminates external USB PHY components, reducing BOM and PCB area versus discrete USB solutions.
Được đề xuất
USB CDC Serial Bridge
The PIC24FJ256GB108T-I/PT supports USB Communications Device Class (CDC) firmware-only stacks, enabling USB-to-UART, USB-to-SPI, or USB-to-I2C bridge products without external memory. The four UART, three SPI, and three I2C controllers map cleanly to multiple legacy buses for protocol conversion. With 16 KB RAM and 256 KB Flash, the device supports CDC composite plus vendor-specific diagnostics. According to Microchip application notes, the 32 MHz core sustains 921600 baud throughput without buffering artifacts, ideal for industrial bridge modules.
Được đề xuất
Embedded USB Host Data Logger
The PIC24FJ256GB108T-I/PT runs in USB host mode to read mass-storage or HID devices for data logging without a PC. The integrated USB OTG controller handles bulk-only transport, plus 16 KB RAM buffers USB transactions for write-through to external SPI flash or SD cards. Industrial -40C to +85C temperature range supports field deployments in cabinets or vehicles. According to Microchip USB host stack documentation, the OTG role-swap capability allows a single device to act as host or peripheral depending on cable insertion sense.
Được đề xuất
USB OTG Dual-Role Accessory
The PIC24FJ256GB108T-I/PT's USB OTG controller negotiates HNP and SRP, enabling accessories that swap roles based on the connected partner. Examples include phone/tablet dongles, instrument probes that present as either HID or mass storage, and USB diagnostic tools. The 256 KB Flash accommodates both USB stacks plus state machine code for role detection. According to the Microchip PIC24FJ256GB1xx datasheet, the VBUS pin supports OTG charge-pump or pulse generation required by the OTG supplement specification.
Được đề xuất
Industrial Sensor Node with USB Diagnostics
Industrial sensors benefit from the PIC24FJ256GB108T-I/PT's USB port for on-site diagnostics, calibration, and firmware update via CDC or vendor-class interfaces. The multiple UART, SPI, and I2C controllers interface directly to typical sensor front-ends (Modbus over UART, I2C sensors, SPI ADCs), and the 16 MIPS core handles sensor fusion and digital filtering. According to the industrial -40C to +85C rating, the device operates in factory-floor enclosures without derating. The 80-TQFP pin count exposes 69 I/O for parallel sensor arrays or keypad/HMI attachments.
Được đề xuất
Consumer Audio USB Accessory
The PIC24FJ256GB108T-I/PT serves USB audio class 1.0 accessories such as USB headsets, USB microphones, or USB DAC dongles. The 16-bit PIC24F core provides deterministic interrupt latency critical for isochronous USB audio, while 256 KB Flash stores USB descriptors plus application code. The integrated USB Full-Speed transceiver eliminates external PHY components versus 8-bit PIC alternatives. According to Microchip USB audio class firmware notes, the device's DMA-capable peripherals minimize CPU load for streaming audio paths.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC24FJ256GB108T-I/PT — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC24FJ256GB108-I/PT | PIC24FJ192GB108T-I/PT | PIC24FJ256GA108T-I/PT | PIC24FJ128GB108T-I/PT | PIC24FJ256GB110T-I/PT |
|---|---|---|---|---|---|---|
| Package | 80-TQFP (12x12) | 80-TQFP (12x12) - same | 80-TQFP (12x12) - same | 80-TQFP (12x12) - same | 80-TQFP (12x12) - same | 100-TQFP (12x12) - extended |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 256 KB | 256 KB | 192 KB (-25%) | 256 KB | 128 KB (-50%) | 256 KB |
| RAM | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| USB OTG Controller | Yes (Full-Speed) | Yes | Yes | No (GA = no USB) | Yes | Yes |
| CPU Core / Speed | PIC24F 16-bit, 32 MHz / 16 MIPS | PIC24F 16-bit, 32 MHz | PIC24F 16-bit, 32 MHz | PIC24F 16-bit, 32 MHz | PIC24F 16-bit, 32 MHz | PIC24F 16-bit, 32 MHz |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| I/O Pins | 69 | 69 | 69 | 69 | 69 | 85 (extended) |
| Timers / UART / SPI / I2C | 23 timers, 4 UART, 3 SPI, 3 I2C | 23/4/3/3 | 23/4/3/3 | 23/4/3/3 | 23/4/3/3 | 23/4/3/3 |
Bảo phân biệt quan trọng
- Integrated USB OTG with 256 KB Flash - balanced for USB stack plus application (vsPIC24FJ256GA108T-I/PT)
- Drop-in Flash-density upgrade from PIC24FJ128GB108T-I/PT (vsPIC24FJ128GB108T-I/PT)
- Firmware-compatible with PIC24FJ256GB110T-I/PT extended package (vsPIC24FJ256GB110T-I/PT)
Ghi chú thiết kế
Route the USB D+ and D- differential pair on the top layer with a 90 ohm differential impedance and a continuous ground reference plane underneath; keep total length below 50 mm. Place the VBUS protection components (TVS diode and series PTC or current-limit switch) within 5 mm of the USB connector. Decouple each VDD pin with a 100 nF ceramic plus a 4.7 uF bulk capacitor placed within 3 mm of the pin. Maintain a solid ground pour under the TQFP thermal pad region to assist thermal dissipation at industrial temperatures.
The PIC24FJ256GB108T-I/PT operates from 2.0 V to 3.6 V; USB transceiver blocks require a stable 3.3 V rail during enumeration. Add a low-dropout regulator such as MCP1700 or MCP1825 upstream, with bulk capacitance rated to handle USB inrush current (typically 100 mA in device mode, 500 mA in host mode). For OTG applications where the device may source VBUS, ensure the upstream regulator or charge pump can handle 8 mA minimum for OTG pull-up pulses plus device-side load. Sequence the 3.3 V rail to be stable before MCLR releases.
Avoid pulling the MCLR pin high without a 10 kohm pull-up to VDD; floating MCLR may intermittently reset the MCU during USB events. When using the internal 8 MHz oscillator with the 4x PLL, enable the PLL wait-state insertion bits in OSCCON to avoid Flash read errors at 32 MHz. Confirm the VBUS pin connection during OTG role-swap - a missing or floating VBUS causes the OTG controller to fail HNP detection. The PPS (Peripheral Pin Select) mapping is one-time-locked per pin; re-assigning requires careful review of datasheet PPS tables.
At 32 MHz operation with all peripherals active, typical core current is approximately 30 mA. The 80-TQFP package thermal resistance theta_JA is approximately 45 C/W (per Microchip package thermal data). For sealed industrial enclosures with limited airflow, attach the exposed die paddle (if present on the TQFP variant) to a copper pour to spread heat. Provide a minimum 50 mm x 50 mm copper pour on the top layer for thermal relief; derate clock speed or shut down unused peripherals if internal die temperature exceeds 100 C in field testing.
Thông tin tuân thủ
RoHS and REACH compliant per Abacus Technologies and DigiKey compliance data. Not AEC-Q100 qualified - this is an industrial-grade part (-I suffix); for automotive applications evaluate PIC24FJ variants with -E or -V suffixes.
