PIC24FJ256GL405-I/PT - 16-bit 256KB Flash LCD MCU, 48-TQFP
MPN: PIC24FJ256GL405-I/PT ✓ نشطPIC24FJ256GL405-I/PT نظرة عامة
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), volatile working memory (RAM), and a rich set of peripherals such as timers, communication interfaces, ADCs, and increasingly domain-specific blocks like LCD segment drivers or USB transceivers. The PIC24FJ family sits in the 16-bit microcontrollers tier of the broader embedded computing taxonomy: 8-bit MCUs -> 16-bit MCUs -> 32-bit ARM Cortex MCUs -> application processors. PIC24F parts in particular target low-power, LCD-driven human-machine interface (HMI) products where battery life and segment display integration matter more than raw CPU throughput.
Key features of the PIC24FJ256GL405-I/PT include 256KB of Flash with Error-Correcting Code (ECC), 32KB RAM, hardware LCD segment driver, full-speed USB 2.0 FS, multiple Core Independent Peripherals (CIPs), 12-bit ADC, up to 21 analog channels, and multiple capture/compare/PWM modules. Dual Partition Flash allows a backup image to be stored so a failed firmware update can roll back automatically, which is essential for unattended IoT endpoints.
Architecturally, the PIC24FJ256GL405 uses a 16-bit modified Harvard core with separate program and data buses, allowing simultaneous instruction fetch and data access. The ECC-protected Flash stores both code and emulated EEPROM, while CIPs such as CLC, MCCP, and DMA let designers offload tasks from the CPU to lower active run-time and reduce average power consumption in sleep-dominated duty cycles.
Typical applications include battery-powered smart thermostats, wearable health monitors, e-meter displays, industrial sensor hubs with LCD readouts, USB-CDC/HID peripherals, and consumer appliances with segmented LCDs. The integrated LCD, USB, and OTA firmware make it a strong fit for connected HMI products that must run for years on a coin cell or two AA cells.
When designing with this MCU, pay attention to decoupling near the VDD/VSS pairs and route the USB DP/DNM lines as a 90 ohm differential pair. For OTA, leave at least one Dual Partition slot fully programmed as the golden image so a watchdog-assisted rollback can recover from corrupt updates.
بدائل مباشرة لـ PIC24FJ256GL405-I/PT — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع PIC24FJ256GL405-I/PT (نفس عامل الشكل والبصمة) — يختلف في Package, Operating Temperature, USB, ADC, Core Architecture.
PIC24FJ256GL405-E/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC24FJ128GL405-I/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC24FJ128GL406-I/PT
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC24FJ128GL410T-I/PT
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC24FJ256GU410-I/PT
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC24FJ256GL405-I/PT الحدود القصوى والخصائص الكهربائية
| Core | PIC24F 16-bit modified Harvard |
| Program Memory (Flash) | 256 KB (with ECC) |
| Data Memory (RAM) | 32 KB |
| Maximum CPU Speed | 32 MHz / 16 MIPS |
| Operating Voltage | 2.0 V to 3.6 V |
| درجة حرارة التشغيل | -40 C to +85 C (Industrial, '-I' suffix) |
| العلبة | 48-pin TQFP (7x7 mm) |
| نوع التركيب | Surface Mount |
| Flash Partition | Dual Partition (OTA-capable) |
| USB | USB 2.0 Full-Speed device |
| LCD Driver | Integrated segmented LCD controller |
| مستوى MSL | MSL 3 (per JEDEC J-STD-020) |
| Lead-Free / RoHS | Lead-free, RoHS compliant |
تكوين أطراف PIC24FJ256GL405-I/PT
| دبوس 1 | SDA3/RP15/RB15 — I2C3 data / remappable peripheral / GPIO RB15 |
| دبوس 2 | SCL3/RP14/RB14 — I2C3 clock / remappable peripheral / GPIO RB14 |
| دبوس 3 | RP13/RB13 — Remappable peripheral / GPIO RB13 |
| دبوس 4 | RP12/RB12 — Remappable peripheral / GPIO RB12 |
| دبوس 5 | VUSB3V3 — USB internal 3.3V regulator output (bypass required) |
| دبوس 6 | VDD — Digital supply voltage (2.0V-3.6V) |
| دبوس 7 | DNM — USB D- line (Full-Speed) |
| دبوس 8 | DP — USB D+ line (Full-Speed) |
| دبوس 9 | VSS — Digital ground |
| دبوس 10 | OSCI/CLKI/RC12 — Crystal oscillator input / external clock / GPIO RC12 |
| دبوس 11 | OSCO/CLKO/RC15 — Crystal oscillator output / GPIO RC15 |
| دبوس 12 | RP9/RC9 — Remappable peripheral / GPIO RC9 |
| دبوس 13 | RP10/RC10 — Remappable peripheral / GPIO RC10 |
| دبوس 14 | RP11/RC11 — Remappable peripheral / GPIO RC11 |
| دبوس 15 | SEG0 — LCD segment output 0 |
| دبوس 16 | SEG1 — LCD segment output 1 |
| دبوس 17 | SEG2 — LCD segment output 2 |
| دبوس 18 | SEG3 — LCD segment output 3 |
| دبوس 19 | SEG4 — LCD segment output 4 |
| دبوس 20 | SEG5 — LCD segment output 5 |
| دبوس 21 | SEG6/COM0 — LCD segment 6 / common 0 (multiplexed) |
| دبوس 22 | SEG7/COM1 — LCD segment 7 / common 1 (multiplexed) |
| دبوس 23 | SEG8/COM2 — LCD segment 8 / common 2 (multiplexed) |
| دبوس 24 | SEG9/COM3 — LCD segment 9 / common 3 (multiplexed) |
| دبوس 25 | VLCD3 — LCD bias voltage 3 |
| دبوس 26 | VLCD2 — LCD bias voltage 2 |
| دبوس 27 | VLCD1 — LCD bias voltage 1 |
| دبوس 28 | AVDD — Analog supply voltage |
| دبوس 29 | AVSS — Analog ground |
| دبوس 30 | AN0/CVD0 — ADC analog input 0 / CVD input 0 |
| دبوس 31 | AN1/CVD1 — ADC analog input 1 / CVD input 1 |
| دبوس 32 | AN2 — ADC analog input 2 |
| دبوس 33 | AN3 — ADC analog input 3 |
| دبوس 34 | AN4 — ADC analog input 4 |
| دبوس 35 | AN5 — ADC analog input 5 |
| دبوس 36 | AN6 — ADC analog input 6 |
| دبوس 37 | AN7 — ADC analog input 7 |
| دبوس 38 | MCLR — Master clear (reset) input, active-low |
| دبوس 39 | VDD — Digital supply voltage (2.0V-3.6V) |
| دبوس 40 | VSS — Digital ground |
| دبوس 41 | RA0 — GPIO RA0 |
| دبوس 42 | RA1 — GPIO RA1 |
| دبوس 43 | RP5/RA5 — Remappable peripheral / GPIO RA5 |
| دبوس 44 | RP6/RA6 — Remappable peripheral / GPIO RA6 |
| دبوس 45 | RP7/RA7 — Remappable peripheral / GPIO RA7 |
| دبوس 46 | RP8/RA8 — Remappable peripheral / GPIO RA8 |
| دبوس 47 | RP0/RA9 — Remappable peripheral / GPIO RA9 |
| دبوس 48 | RP1/RA10 — Remappable peripheral / GPIO RA10 |
التطبيقات النموذجية
PIC24FJ256GL405-I/PT مناسب لـ 6 التطبيقs: Smart Thermostat with Segmented LCD, Battery-Powered Wearable Health Monitor, USB-CDC / HID Smart Sensor Hub, Industrial E-Meter / Utility Display, Consumer Appliance with LCD HMI, IoT Edge Node with Secure OTA.
Smart Thermostat with Segmented LCD
The PIC24FJ256GL405-I/PT's integrated segmented LCD controller drives a typical 4- to 8-segment-per-digit temperature and status display directly, eliminating an external LCD driver IC and saving roughly $0.30 to $0.60 of BOM cost. With 256KB ECC Flash and Dual Partition OTA, designers can safely push seasonal firmware updates to deployed thermostats without risk of bricking the unit. The 32KB RAM handles capacitive-touch key scanning buffers and Zigbee/BLE co-processor command queues comfortably.
موصى به
Battery-Powered Wearable Health Monitor
Wearable health monitors demand ultra-low sleep current and enough Flash to hold BLE stack, sensor-fusion firmware, and OTA images. The PIC24FJ256GL405-I/PT's 2.0V minimum supply lets the design run from a single CR2032 down to end-of-life, while its Core Independent Peripherals (CIPs) sample the heart-rate sensor and accelerometer in deep sleep without waking the CPU, extending battery life by 2x to 4x versus a polled-only architecture.
موصى به
USB-CDC / HID Smart Sensor Hub
For USB-tethered sensor hubs used in lab automation or industrial test, the PIC24FJ256GL405-I/PT provides on-chip USB 2.0 Full-Speed with no external PHY, cutting BOM and simplifying FCC/USB-IF compliance. The 16 MIPS core is sufficient for polling 8-12 sensors at 100 Hz while running a CDC virtual COM port at 12 Mbps. Dual Partition OTA via USB allows field engineers to push new calibration firmware without opening the enclosure.
موصى به
Industrial E-Meter / Utility Display
Smart electricity meters require 10+ year battery life on a lithium primary cell plus a high-contrast segmented LCD for kWh and tariff readouts. The PIC24FJ256GL405-I/PT's low-power PIC24F core, integrated LCD segment driver, and 256KB Flash for tariff scheduling fit this application well. The Extended (-E) variant adds headroom for outdoor enclosures where the meter may see -30 C to +85 C ambient swings.
موصى به
Consumer Appliance with LCD HMI
Coffee machines, washing machines, and air purifiers typically need a segmented LCD for time/temperature display plus USB service-port diagnostics. The PIC24FJ256GL405-I/PT drives the LCD directly and exposes USB for firmware updates by service technicians. The Dual Partition Flash ensures a failed update cannot brick the appliance in the field, which is critical for warranty cost control.
موصى به
IoT Edge Node with Secure OTA
Edge IoT nodes that collect sensor data and forward over LoRa, NB-IoT, or sub-GHz radios need a low-power MCU capable of secure firmware updates. The PIC24FJ256GL405-I/PT's Dual Partition Flash enables A/B image updates with automatic rollback, while the PIC24F sleep modes and CIPs keep average current under 5 uA. The 256KB Flash comfortably holds an ECC-protected image plus a Golden Image backup for fail-safe recovery.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ PIC24FJ256GL405-I/PT — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | PIC24FJ256GL405-E/PT | PIC24FJ128GL405-I/PT | PIC24FJ128GL406-I/PT | PIC24FJ128GL410T-I/PT | PIC24FJ256GU410-I/PT |
|---|---|---|---|---|---|---|
| Package | 48-pin TQFP (7x7 mm) | 48-pin TQFP (7x7 mm) - same | 48-pin TQFP (7x7 mm) - same | 48-pin TQFP (7x7 mm) - same | 48-pin TQFP (7x7 mm) - same | 48-pin TQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 256 KB (ECC) | 256 KB (ECC) | 128 KB (ECC) - 50% less | 128 KB (ECC) - 50% less | 128 KB (ECC) - 50% less | 256 KB (ECC) |
| Data Memory (RAM) | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| Integrated LCD Driver | Yes (segmented LCD) | Yes | Yes | Yes | Yes | Yes |
| USB | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Host/Device/OTG |
| Dual Partition OTA Flash | Yes | Yes | Yes | Yes | Yes | Yes |
أبرز الفروقات
- Integrated segmented LCD controller on-chip (مقابلPIC24FJ256GA705-I/PT (general-purpose, no LCD))
- Dual Partition OTA Flash with ECC (مقابلPIC24FJ256GB110-I/PT (single partition))
- USB 2.0 Full-Speed with on-chip transceiver (مقابلPIC24FJ256DA106-I/PT (no USB))
ملاحظات التصميم
Estimated: at 32 MHz active and 3.3V supply, the PIC24FJ256GL405-I/PT typically draws about 8 to 10 mA active and under 5 uA in deep sleep. Use a 10 uF bulk + 100 nF decoupling pair on each VDD/VSS pin pair, and place them within 3 mm of the pins. If running from a coin cell, gate the LCD bias network with a TPS22918 load switch to drop standby current below 1 uA total.
Route the USB DP and DNM pair as a 90 ohm differential with matching lengths to within 150 mil. Keep DP/DNM away from switching regulators and clock traces by at least 5 mm. Per the Microchip datasheet, place the VUSB3V3 bypass capacitor (4.7 uF) as close to pin 5 as possible; missing this cap is a common cause of USB enumeration failures.
Do not omit the AVDD/AVSS power pins even if you do not use the ADC - the PIC24FJ256GL405-I/PT datasheet requires AVDD tied to VDD and AVSS tied to VSS for correct operation of the bandgap and core voltage regulator. Also, when using Dual Partition OTA, always program a verified Golden Image into the inactive partition so the bootloader can roll back automatically on a corrupt update.
معلومات الامتثال
RoHS and REACH compliance per Microchip product page. Not AEC-Q100 qualified (the -E temperature variant is for extended industrial, not automotive).
