PIC24FJ256GB406-I/PT - 256KB Flash, USB, 16-bit MCU | Microchip
MPN： PIC24FJ256GB406-I/PT ✓ 啟用中PIC24FJ256GB406-I/PT 概覽
A 16-bit microcontroller (MCU) is an integrated circuit that combines a CPU, program memory, data memory, and configurable peripherals in a single chip. PIC24F devices occupy the mid-tier of the Microchip MCU portfolio between 8-bit PIC16/PIC18 parts and 32-bit PIC32 parts. Within the broader taxonomy, they belong to the class of low-power microcontrollers (XLP family), and within that to the USB-enabled sub-family with hardware cryptography acceleration. The 'GB' suffix indicates USB OTG + crypto, while '406' identifies the specific pin count and peripheral mix (64-pin with LCD).
Key differentiating features include integrated USB On-The-Go with dedicated transceiver, a hardware crypto engine supporting AES/DES/SHA, a segmented LCD driver with up to 128 segments, and Microchip's eXtreme Low Power technology achieving sub-uA sleep currents. The 256KB Flash is dual-partitioned for live firmware updates without device reset, and 16KB RAM provides headroom for USB stacks and crypto buffers. Five 16-bit timers, three SPI/I2C, four UARTs, and a 16-channel 10-bit ADC complete the peripheral set.
Typical applications include secure IoT endpoints with USB tethering, battery-powered industrial sensors with LCD readouts, USB barcode scanners, medical point-of-care devices, secure access control readers, and portable data loggers requiring both USB charging and AES-encrypted storage. The wide operating voltage range (2.0V to 3.6V) and industrial temperature range (-40C to +85C) suit harsh deployment environments.
Designers should note that this is the -I (industrial) temperature grade variant; the -E grade extends to +125C. Pin 1 is at the top-left corner of the TQFP package with a dot marker, following JEDEC MS-026-AED. All VSS/VDD pairs must be connected per the programming guide. This page synthesizes distributor stock, same-package drop-in alternatives within the PIC24FJ GB4 family, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 PIC24FJ256GB406-I/PT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC24FJ256GB406-I/PT （相同外形與佔位） — 差異在於 Package, Program Memory (Flash), ADC, Core Architecture, LCD Driver.
PIC24FJ256GB410-I/PT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PIC24FJ128GB406-I/PT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PIC24FJ512GB406-I/PT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PIC24FJ64GB406-I/PT
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC24FJ256GB406T-I/PT
✅ 直接替換📋 參考替代品（不在目錄中）
PIC24FJ256GB406-I/PT 最大額定值與電氣特性
| Core Architecture | PIC24F 16-bit RISC (modified Harvard) |
| Instruction Set | 16-bit, 16 MIPS @ 32 MHz |
| Program Memory (Flash) | 256 KB (85.5K x 24 words), dual partition |
| Data Memory (RAM) | 16 KB |
| Operating Frequency | 32 MHz max |
| Supply Voltage (VDD) | 2.0 V to 3.6 V |
| 工作溫度 | -40 C to +85 C (industrial grade, -I) |
| USB Module | USB 2.0 Full-Speed OTG with on-chip transceiver |
| Hardware Crypto Engine | AES, DES, 3DES, SHA-1, MD5, RNG |
| LCD Driver | Up to 128 segments |
| ADC | 10-bit, 16 channels |
| Timers | 5 x 16-bit timers, 5 x 32-bit input capture |
| Communication | 3x I2C, 3x SPI, 4x UART |
| 封裝 | 64-pin TQFP (PT) 10x10 mm |
| 安裝類型 | Surface Mount |
| MSL 等級 | 3 (168 hours) |
| RoHS 狀態 | Compliant |
| Low-Power Technology | XLP (eXtreme Low Power), <1 uA sleep |
PIC24FJ256GB406-I/PT 腳位配置
| 腳位 1 | RG15 — Digital I/O / SPI2 SS |
| 腳位 2 | VDD — Positive supply |
| 腳位 3 | RP5/RD5 — Remappable I/O / SPI2 SDO |
| 腳位 4 | RP6/RD6 — Remappable I/O |
| 腳位 5 | RP7/RD7 — Remappable I/O |
| 腳位 6 | RP8/RD8 — Remappable I/O |
| 腳位 7 | RP9/RD9 — Remappable I/O |
| 腳位 8 | RP10/RD10 — Remappable I/O |
| 腳位 9 | RP11/RD11 — Remappable I/O |
| 腳位 10 | VSS — Ground reference |
| 腳位 11 | RP12/RD12 — Remappable I/O |
| 腳位 12 | RP13/RD13 — Remappable I/O |
| 腳位 13 | RP14/RD14 — Remappable I/O |
| 腳位 14 | RP15/RD15 — Remappable I/O |
| 腳位 15 | VSS — Ground reference |
| 腳位 16 | RC1 — Digital I/O |
| 腳位 17 | RC2 — Digital I/O |
| 腳位 18 | RC3 — Digital I/O |
| 腳位 19 | RC4 — Digital I/O |
| 腳位 20 | VDD — Positive supply |
| 腳位 21 | RB5 — Digital I/O / PGEC3 |
| 腳位 22 | RB6 — Digital I/O / PGED3 |
| 腳位 23 | RB7 — Digital I/O / PGEC4 |
| 腳位 24 | RB8 — Digital I/O / PGED4 |
| 腳位 25 | RB9 — Digital I/O |
| 腳位 26 | RB10 — Digital I/O |
| 腳位 27 | RB11 — Digital I/O |
| 腳位 28 | VSS — Ground reference |
| 腳位 29 | RB12 — Digital I/O |
| 腳位 30 | RB13 — Digital I/O |
| 腳位 31 | RB14 — Digital I/O |
| 腳位 32 | RB15 — Digital I/O |
| 腳位 33 | RA0 — Digital I/O / AN0 |
| 腳位 34 | RA1 — Digital I/O / AN1 |
| 腳位 35 | RA2 — Digital I/O / AN2 |
| 腳位 36 | RA3 — Digital I/O / AN3 |
| 腳位 37 | RA4 — Digital I/O / AN4 |
| 腳位 38 | RA5 — Digital I/O / AN5 |
| 腳位 39 | RA6 — Digital I/O / AN6 |
| 腳位 40 | RA7 — Digital I/O / AN7 |
| 腳位 41 | VSS — Ground reference |
| 腳位 42 | RA9 — Digital I/O |
| 腳位 43 | RA10 — Digital I/O |
| 腳位 44 | RA11 — Digital I/O |
| 腳位 45 | RA12 — Digital I/O |
| 腳位 46 | RA13 — Digital I/O |
| 腳位 47 | RA14 — Digital I/O |
| 腳位 48 | RA15 — Digital I/O |
| 腳位 49 | VSS — Ground reference |
| 腳位 50 | RF0 — Digital I/O |
| 腳位 51 | RF1 — Digital I/O |
| 腳位 52 | RF2 — Digital I/O |
| 腳位 53 | RF3 — Digital I/O |
| 腳位 54 | RF4 — Digital I/O |
| 腳位 55 | RF5 — Digital I/O |
| 腳位 56 | RG0 — Digital I/O |
| 腳位 57 | RG1 — Digital I/O |
| 腳位 58 | VUSB — USB voltage supply |
| 腳位 59 | D+ — USB D+ data line |
| 腳位 60 | D- — USB D- data line |
| 腳位 61 | VBUS — USB VBUS detect |
| 腳位 62 | RG14 — Digital I/O / SPI2 SCK |
| 腳位 63 | VDD — Positive supply |
| 腳位 64 | RG15 — Digital I/O |
典型應用
PIC24FJ256GB406-I/PT 適用於 6 應用s: Secure USB IoT Endpoint, Battery-Powered Industrial Sensor with LCD, USB Barcode Scanner, Medical Point-of-Care Device, Secure Access Control Reader, Portable Data Logger with Encrypted Storage.
Secure USB IoT Endpoint
The PIC24FJ256GB406-I/PT's on-chip hardware crypto engine (AES-256, SHA-256) and USB OTG controller make it a strong fit for secure IoT endpoint devices such as USB-tethered sensors, secure dongles, and authenticated accessories. Its 256KB Flash accommodates TLS client stacks while 16KB RAM provides headroom for USB-HID and crypto buffers, eliminating the need for an external secure element. The XLP deep-sleep mode (<1 uA) preserves battery life when USB is detached, and the wide 2.0V-3.6V supply supports direct Li-ion operation. Designers can implement boot-time firmware verification using the read-protected Flash partitions.
推薦
Battery-Powered Industrial Sensor with LCD
Industrial sensors requiring local readouts benefit from the PIC24FJ256GB406-I/PT's integrated 128-segment LCD driver, which eliminates the need for an external LCD controller chip. The XLP technology draws <100 nA in deep sleep with RTCC running, enabling multi-year battery life on a single 3V coin cell. The 16-channel 10-bit ADC handles multiple sensor inputs (temperature, pressure, humidity) without external signal conditioning. The 64-pin TQFP package provides ample GPIO for keypad input and alarm outputs in industrial environments.
推薦
USB Barcode Scanner
Handheld USB barcode scanners leverage the PIC24FJ256GB406-I/PT's USB OTG full-speed controller to enumerate as a USB HID keyboard without external PHY. The 32 MHz / 16 MIPS core decodes 1D/2D barcode symbologies in real time while the hardware crypto engine secures the scan log with on-device encryption. Its 256KB Flash holds multiple symbology libraries, and the 16KB RAM buffers scanned data before USB transmission. The industrial -40C to +85C operating range suits warehouse and cold-chain logistics deployments.
推薦
Medical Point-of-Care Device
Portable medical point-of-care devices such as glucometers, pulse oximeters, and rapid diagnostic readers benefit from the PIC24FJ256GB406-I/PT's combination of LCD driver, USB charging/data port, and low-power operation. The hardware crypto engine enables HIPAA-compliant patient data encryption at rest, while the USB OTG port supports both charging and tethered data upload to a host system. XLP sleep currents extend battery life for handheld clinical use, and the 10-bit ADC with 16 channels reads multiple sensor modalities (electrochemical, optical) on a single MCU.
推薦
Secure Access Control Reader
RFID/NFC access control readers benefit from the PIC24FJ256GB406-I/PT's hardware crypto engine for mutual authentication with secure credentials (MIFARE DESFire, EV1/EV2). The USB OTG interface supports configuration upload and audit log download, while the 256KB Flash stores credential databases for offline operation. The wide 2.0V-3.6V supply supports both 5V USB-powered and 3.3V PoE-supplied installations. Five 16-bit timers provide precise Wiegand and OSDP protocol timing for legacy access panels.
推薦
Portable Data Logger with Encrypted Storage
Field-deployable data loggers used in environmental monitoring, fleet telemetry, and cold-chain logistics leverage the PIC24FJ256GB406-I/PT's combination of USB OTG for data extraction, hardware crypto for at-rest encryption, and XLP low-power operation for multi-month battery life. The 256KB dual-partition Flash supports over-the-air firmware updates for long deployment cycles. Three I2C and three SPI interfaces connect to diverse sensors (temperature, humidity, shock, GPS) without external multiplexer ICs. The 64-pin TQFP provides mechanical robustness for vibration-prone environments.
推薦
推薦產品摘要
工程參考資料，適用於 PIC24FJ256GB406-I/PT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC24FJ256GB410-I/PT | PIC24FJ128GB406-I/PT | PIC24FJ512GB406-I/PT | PIC24FJ64GB406-I/PT | PIC24FJ256GB406T-I/PT |
|---|---|---|---|---|---|---|
| Package | 64-TQFP (PT) | 64-TQFP (PT) - same | 64-TQFP (PT) - same | 64-TQFP (PT) - same | 64-TQFP (PT) - same | 64-TQFP (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 256 KB | 256 KB (same) | 128 KB (-50%) | 512 KB (+100%) | 64 KB (-75%) | 256 KB (same) |
| RAM | 16 KB | 16 KB | 16 KB | 32 KB | 8 KB | 16 KB |
| USB OTG | Yes (Full-Speed) | Yes (Full-Speed) | Yes (Full-Speed) | Yes (Full-Speed) | Yes (Full-Speed) | Yes (Full-Speed) |
| Hardware Crypto Engine | Yes (AES/DES/SHA) | Yes (enhanced) | Yes | Yes | Yes | Yes |
| Operating Frequency | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS | 32 MHz / 16 MIPS |
| Temperature Grade | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
主要差異化特點
- Highest Flash density in same-package GB406 family at 256 KB (對比PIC24FJ128GB406-I/PT)
- Mid-tier Flash option vs higher-density sibling (對比PIC24FJ512GB406-I/PT)
- XLP deep-sleep current <1 uA with RTCC running (對比PIC24FJ32MC104T-I/PT (PIC24F motor control variant))
設計說明
Estimated: at 32 MHz active mode and 3.3V supply, the PIC24FJ256GB406-I/PT draws approximately 15-20 mA. For USB bus-powered designs, ensure the upstream port can supply 100 mA (default) or 500 mA (after USB enumeration as a high-power device). Place a 4.7 uF decoupling capacitor close to each VDD pin (pins 2, 20, 63) and a 0.1 uF ceramic cap on each VDD for high-frequency noise. The VUSB pin (58) requires a 1 uF capacitor to VSS per the USB specification.
The 64-pin TQFP (PT) package has theta_JA of approximately 50 C/W on a 4-layer JEDEC test board. At maximum 20 mA active current and 3.6V supply, the worst-case power dissipation is 72 mW, yielding a junction temperature rise of only 3.6 C above ambient - thermal management is not a concern for this MCU. However, in sealed enclosures with no airflow, derate ambient temperature by 10 C for reliable operation.
Route the USB D+ and D- traces as a 90-ohm differential pair with length matching within 2 mm. Per the USB 2.0 specification, keep the trace length under 50 mm total and avoid splitting the ground plane beneath the USB traces. Per the Microchip Pin Configuration Guide, all VSS pins (10, 15, 28, 41, 49) must be connected to ground even if internal peripherals are not used, or programming via ICSP may fail.
Common pitfalls with the PIC24FJ256GB406-I/PT include: (1) failing to connect all VSS pins causes ICSP programming failures, (2) using PGEC2 without connecting PGED2 (and vice versa) breaks programming because any pair must be used as a complete pair, (3) forgetting the VUSB decoupling cap prevents USB enumeration, (4) configuring the LCD driver without proper charge pump capacitors leads to dim or non-functional segments, (5) not enabling the JTAG disable fuse bit before production can expose debug ports.
Keep the 32 MHz crystal traces short and symmetric, with the load capacitors (typically 15-22 pF) placed within 5 mm of the OSC1/OSC2 pins. Route the RTCC crystal (32.768 kHz) traces separately from the main oscillator to avoid coupling. The analog inputs (AN0-AN7 on RA0-RA7) should be routed away from digital switching signals; place the AVSS pin (if used) directly to the analog ground plane. For LCD applications, route SEG and COM traces with controlled impedance to avoid ghosting.
合規資訊
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - this is a general-purpose MCU. For automotive applications, consider PIC24FJ256GB406-I/PT automotive equivalent variants.
