PIC24FJ256GB412-I/BG - 256KB Flash, USB OTG, LCD MCU | Microchip
MPN： PIC24FJ256GB412-I/BG ✓ 啟用中PIC24FJ256GB412-I/BG 概覽
A 16-bit microcontroller (MCU) is a microprocessor class that uses a 16-bit data path and instruction word, offering a balance between the 8-bit simplicity of legacy MCUs and the performance of 32-bit Cortex-M parts. PIC24F devices sit in Microchip's 16-bit portfolio and add features such as USB OTG, segmented LCD, and crypto engines; in the broader taxonomy they belong to microcontrollers -> embedded processors -> semiconductors -> integrated circuits. The 16 MIPS CPU core provides deterministic real-time performance for control loops and human-interface firmware, while XLP nanoWatt technology enables sleep currents below 1 uA in deep sleep.
Key differentiating features include hardware crypto acceleration for AES/DES/SHA operations, a 10-bit 1.1 Msps ADC with up to 32 channels, four I2C, three SPI, and five UART interfaces, plus a Parallel Master Port (PMP) for external graphics or memory expansion. The integrated segmented LCD controller supports up to 512 segments with on-chip charge pump and software contrast control. Live Update Flash allows the firmware image to be updated without external supervisor, while dual-partition boot enables fail-safe bootloader operation. The device also provides CTMU charge-time measurement for capacitive touch sensing.
The PIC24FJ256GB412 uses a Harvard architecture with separate program and data buses, an 8-deep hardware stack, and a vectored interrupt controller with 5 priority levels. The modified RISC instruction set allows most instructions to execute in a single cycle, and DSP extensions accelerate FIR/IIR filters commonly used in motor control and audio conditioning. The 32 MHz internal oscillator and 96 MHz PLL provide flexible clocking with FRC auto-tuning against a 32.768 kHz reference for USB-accurate timing.
Typical applications include secure portable medical devices, IoT sensor hubs with USB charging, secure payment terminals, industrial HMI panels with LCD + touch, USB-C audio interfaces, and battery-powered smart meters. Its hardware crypto and segmented LCD make it particularly attractive for wearables and consumer devices that need both privacy and a low-pin-count display.
When designing with this part, plan for an external 32.768 kHz crystal if USB accuracy is required, and route the TFBGA 121-pin escape on at least 4 PCB layers with micro-vias under the package. Decouple each VDD/VSS pair with 100 nF and bulk 4.7 uF, and follow the IBIS model for USB DP/DN impedance matching at 90 ohm differential. Crypto key storage must be planned against the 64-byte secure key area in Flash.
This page synthesizes distributor pricing, package-level drop-in alternatives from the same PIC24FJ family, and practical hardware design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 PIC24FJ256GB412-I/BG — 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： PIC24FJ256GB412-I/BG （相同外形與佔位） — 差異在於 Package, ADC, Core Architecture, LCD Driver, Timers.
PIC24FJ256GB412T-I/BG
✅ 直接替換聯絡詢價
查看資料表 →PIC24FJ256GB412-I/BG
✅ 直接替換聯絡詢價
查看資料表 →PIC24FJ128GB412T-I/BG
✅ 直接替換聯絡詢價
查看資料表 →PIC24FJ256GB410-I/PT
✅ 直接替換📋 參考替代品（不在目錄中）
PIC24FJ256GA610-I/BG
✅ 直接替換聯絡詢價
查看資料表 →PIC24FJ256GB406T-I/MR
✅ 直接替換聯絡詢價
查看資料表 →PIC24FJ256GB412-I/BG 最大額定值與電氣特性
| Core Architecture | PIC24F (16-bit Harvard, modified RISC) |
| CPU Speed | 16 MIPS at 32 MHz |
| Program Memory (Flash) | 256 KB (85.5K x 24 instructions) |
| Data Memory (RAM) | 16 KB |
| Hardware Crypto Engine | Yes (AES, DES, 3DES, SHA, MD5, RNG) |
| USB Interface | USB 2.0 Full-Speed OTG |
| Operating Voltage | 2.5 V / 3.3 V |
| LCD Driver | Segmented LCD, up to 512 segments, with charge pump |
| ADC | 10-bit, 1.1 Msps, up to 32 channels |
| Timers | 5 x 16-bit, 5 x 32-bit (with cascadable option) |
| UART | 5 |
| SPI | 3 |
| I2C | 4 |
| 封裝 | 121-TFBGA (10x10x1.20 mm) |
| 工作溫度 | -40 C to +85 C (Industrial grade, -I) |
| 安裝類型 | Surface Mount (BGA) |
| MSL 等級 | 3 (168 hours) |
| RoHS 狀態 | Compliant |
PIC24FJ256GB412-I/BG 121-tfbga (10x10x1.20 mm) 腳位配置指南
PIC24FJ256GB412-I/BG（121-tfbga (10x10x1.20 mm) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： PIC24FJ256GB412-I/BG.
請參閱 資料表 以查看完整腳位配置。
典型應用
PIC24FJ256GB412-I/BG 適用於 7 應用s: Secure Portable Medical Devices, USB-C Charging and Audio Accessories, Industrial HMI Panels with LCD and Touch, Battery-Powered Smart Meters, Wearables with Segmented Display, Secure Payment Terminals and PIN Pads, IoT Sensor Hubs with USB Diagnostics.
Secure Portable Medical Devices
The PIC24FJ256GB412-I/BG's hardware AES/SHA crypto engine and 256 KB Flash make it ideal for portable medical devices that must comply with HIPAA-style data protection. Its XLP nanoWatt deep-sleep current below 1 uA extends battery life for spot-check glucometers, pulse oximeters, and ambulatory ECG patches. The integrated segmented LCD controller (up to 512 segments) drives monochrome displays without an external driver. Hardware crypto acceleration offloads TLS handshakes from the 16 MIPS CPU, keeping the loop responsive. Designers pair this MCU with the TI ADS1292 ECG AFE and a Microchip ATECC608B secure element over I2C for authenticated sensor data.
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USB-C Charging and Audio Accessories
The PIC24FJ256GB412-I/BG's integrated USB 2.0 Full-Speed OTG with on-chip PHY is well matched to USB-C docking stations, audio dongles, and programmable USB chargers. The 32 MHz core plus 96 MHz PLL delivers accurate USB signaling, and the on-chip charge-pump LCD controller can indicate charging status without an external display. Five UART channels and three SPI peripherals enable simultaneous USB, I2S audio bridging, and Bluetooth HCI to companion modules. The 16 KB RAM accommodates full USB descriptors, CDC/HID/MSD stacks, and a small audio buffer. Pair with the FUSB302 USB-C PD controller and a TI TUSB320 for robust Type-C detection.
推薦
Industrial HMI Panels with LCD and Touch
The PIC24FJ256GB412-I/BG drives segmented LCDs up to 512 pixels while its CTMU peripheral enables capacitive touch sensing without an external IC, simplifying 4 to 16-button industrial HMI panels. The 16 MIPS core runs a deterministic control loop, and five 32-bit timers provide PWM for backlight, buzzer, and motor cues. Hardware crypto protects configuration and OTA firmware upgrades, which is critical in factory floor equipment that may be deployed for a decade. Five UARTs bridge to Modbus RTU, RS-485 sensor networks, and a host PLC. The wide -40 C to +85 C industrial temperature range covers most factory environments without derating.
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Battery-Powered Smart Meters
Smart electricity, gas, and water meters benefit from the PIC24FJ256GB412-I/BG combination of segmented LCD, XLP low power, and AES crypto. The RTCC with 32.768 kHz crystal keeps time across power cycles while drawing nanoamps, and the segmented LCD continues to display kWh totals even in deep sleep. Hardware crypto secures wireless MBus or LoRaWAN payloads against tampering. The 10-bit 1.1 Msps ADC samples current shunts or optical pulse sensors directly, removing the need for a separate metering AFE. The wide 2.5 V to 3.6 V supply range supports single-cell LiSOCl2 battery chemistries common in metering.
推薦
Wearables with Segmented Display
The PIC24FJ256GB412-I/BG's XLP nanoWatt sleep current (250 nA typical with RAM retention) and integrated segmented LCD driver make it ideal for fitness bands, smart watches with monochrome displays, and medical wearables. The 256 KB Flash accommodates Bluetooth Low Energy profiles via a companion module plus local sensor-hub firmware. Hardware crypto protects biometric templates at rest. The CTMU peripheral detects touch on segmented overlays, enabling button-less interfaces. With USB OTG the device can charge directly from a phone or laptop without an external charger IC, reducing BOM cost.
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Secure Payment Terminals and PIN Pads
PIN entry devices and countertop payment terminals demand FIPS-grade cryptography and tamper detection, both of which the PIC24FJ256GB412-I/BG addresses with its hardware AES, DES, and SHA engines plus secure key storage. USB OTG allows the terminal to act as a slave to a phone for mPOS use cases. The segmented LCD shows prompts and amounts without an external graphics controller. The 32-bit timers drive cryptographic timing loops deterministically. Pairing this MCU with a Tamper-detection IC and an external secure element creates a layered PCI-PTS compliant architecture.
推薦
IoT Sensor Hubs with USB Diagnostics
The PIC24FJ256GB412-I/BG fits IoT sensor hubs that aggregate multiple I2C/SPI sensors and report to a cloud gateway, with USB used for local diagnostics. The PIC24F's five UARTs and three SPIs handle wireless co-processor (Wi-Fi or LoRa), GPS, and Modbus slaves concurrently. Hardware SHA accelerates TLS session establishment, while XLP sleep extends battery life in remote solar-powered nodes. The 121-TFBGA package supports compact board designs under 25x25 mm. Designers commonly pair this MCU with an Espressif ESP32-C3 as the wireless co-processor, routed over UART or SPI.
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推薦產品摘要
工程參考資料，適用於 PIC24FJ256GB412-I/BG — 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 | PIC24FJ256GB412T-I/BG | PIC24FJ128GB412T-I/BG | PIC24FJ256GA610-I/BG | PIC24FJ256GB406T-I/MR |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 121-TFBGA (10x10x1.20 mm) | 121-TFBGA (10x10x1.20 mm) - same | 121-TFBGA (10x10x1.20 mm) - same | 121-TFBGA (10x10x1.20 mm) - same | QFN-64 (7x7 mm) - smaller |
| Flash | 256 KB | 256 KB | 128 KB (-50%) | 256 KB | 256 KB |
| RAM | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| USB OTG | Yes (FS, integrated PHY) | Yes (FS, integrated PHY) | Yes (FS, integrated PHY) | No | No |
| Hardware Crypto | Yes (AES/DES/SHA/MD5/RNG) | Yes (AES/DES/SHA/MD5/RNG) | Yes (AES/DES/SHA/MD5/RNG) | No | Yes (AES/DES/SHA/MD5/RNG) |
| Segmented LCD | Yes (up to 512 segments) | Yes (up to 512 segments) | Yes (up to 512 segments) | No | No |
| Core Speed | 16 MIPS @ 32 MHz | 16 MIPS @ 32 MHz | 16 MIPS @ 32 MHz | 16 MIPS @ 32 MHz | 16 MIPS @ 32 MHz |
| Operating Voltage | 2.5 V to 3.6 V | 2.5 V to 3.6 V | 2.5 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
主要差異化特點
- Integrated USB OTG eliminates external PHY cost (對比PIC24FJ256GA610-I/BG)
- Segmented LCD controller with built-in charge pump (對比PIC24FJ256GB406T-I/MR)
- 121-TFBGA with maximum IO and memory (對比PIC24FJ128GB412T-I/BG)
- Hardware crypto engine accelerates secure boot (對比PIC24FJ256GA610-I/BG)
設計說明
The 121-TFBGA at 0.5 mm pitch requires 4-layer PCB stack-up with 0.4 mm laser microvias under the BGA array, plus 1-oz copper power planes. Route signal fan-out on the top layer, place ground stitching vias on a 1 mm pitch grid around the perimeter to maintain a low-impedance return path, and stitch the inner solid ground plane with a via fence to suppress USB and LCD switching noise. Per Microchip AN1234 'PCB Design Guidelines for PIC24F BGA Packages', keep BGA balls clear of thermal reliefs on power pads.
Decouple each VDD/VSS pair with a 100 nF X7R 0402 placed within 2 mm of the pin, plus a shared 4.7 uF X5R bulk capacitor near the USB VBUS pin. The USB transceiver requires a clean 3.3 V rail; place a ferrite bead between the main 3.3 V and USB_AVDD to isolate switching noise. The LCD charge pump can inject up to 5 mA peak when driving high-segment-count displays, so size the bulk capacitor for a hold-up of at least 100 us. XLP deep-sleep current is highly sensitive to floating IO - configure all unused pins as outputs driven low and disable unused peripherals in firmware.
The 121-TFBGA has a typical theta-JA of approximately 30 C/W on a 4-layer JEDEC test board, which is adequate for the part's typical 60 mA active current. At full 32 MHz CPU, USB active, and LCD running, total power stays below 200 mW; junction temperature rise above ambient is around 6 C. In enclosed plastic housings without airflow, derate by 30% to keep Tj below 95 C for industrial-grade reliability. Avoid placing heat-generating components (LDO, dc-dc) within 5 mm of the BGA to prevent local hot spots.
Route the USB DP/DN pair as a 90 ohm differential with intra-pair skew under 150 mil, keep series in-line ferrite beads for EMI, and place the 15 kohm pull-down on D- only on the device side per USB 2.0 spec. The 32.768 kHz crystal traces must be short (under 5 mm), guarded by a ground ring, and matched within 10 pF to minimize clock drift that affects USB full-speed signaling accuracy. Use the MCU's PLL FRC self-tune feature to compensate the internal oscillator against the 32 kHz reference, achieving USB-accurate timing without external clock chips.
Do not skip configuration bits on unprogrammed parts - the PIC24FJ256GB412 ships with all peripherals disabled and the watchdog enabled by default. Forgetting to configure the JTAG/ICSP pins (PGECx/PGEDx) as digital IO will leave them in programming mode, causing high current draw. Also, when using the hardware crypto engine, the 64-byte secure key area must be unlocked via a specific sequence; reading it from non-secure code triggers a permanent chip-level lock. Finally, the segmented LCD controller requires the charge pump capacitor (typically 1 uF) on the VLCAP1/VLCAP2 pins - omitting it causes faint display segments.
合規資訊
RoHS and REACH compliant per Microchip product page. Halogen-free per IEC 61249-2-21. Not AEC-Q100 qualified - choose PIC24FJ256GB412-E/BG (extended temperature) or PIC24FJ256GB412-H/BG (automotive, where available) for automotive-grade designs.
