PIC18LF8520-I/PT - 8-bit PIC MCU, 32KB Flash, 80-TQFP | Microchip
MPN: PIC18LF8520-I/PT ✓ Hoạt độngPIC18LF8520-I/PT Tóm tắt
What is a PIC18 microcontroller? A PIC18 is Microchip's 8-bit Harvard-architecture MCU family that combines a 16-bit instruction word with 8-bit data paths, native C-compiler support (MPLAB XC8), on-chip Flash and EEPROM, and a broad peripheral set. PIC18 sits in the taxonomy: PIC18 -> 8-bit MCU -> microcontroller -> embedded IC. The LF prefix denotes the low-voltage variant optimized for 1.8V-3.3V operation while still functioning up to 5V.
Key features include 32KB self-programmable Flash with ICD, 256-byte data EEPROM, two enhanced USART ports for simultaneous communication, MSSP supporting both SPI and I2C master/slave, four timer modules with capture/compare/PWM, a 10-bit multi-channel A/D converter, and nanoWatt power management with multiple idle/sleep modes. The wide voltage range and -40C to +85C industrial temperature grade suit battery-backed and industrial embedded designs.
Architecturally, the PIC18LF8520 employs a 16-bit instruction path with 8-bit data bus, hardware multiply, and a deeply pipelined execution engine, allowing 10 MIPS sustained throughput. The LF silicon process supports deep-sleep currents measured in nanoamps, with wake-up via interrupts, RTCC, or watchdog timer, making the part attractive for energy-harvesting and always-on sensor nodes.
Typical applications include industrial control panels, automotive body and HVAC subsystems, home appliances, HVAC thermostats, data loggers, and human-machine interface (HMI) terminals. The 68 I/O count and dual-USART configuration make it ideal for bridging multiple sensor and actuator buses in embedded systems requiring robust 8-bit determinism.
When designing with this MCU, allocate adequate decoupling (100 nF per VDD pin plus 10 uF bulk) and route the MCLR reset line with proper filtering. The device supports in-circuit serial programming (ICSP) via RB6/RB7, allowing field firmware updates without removing the part from the board.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the PIC18LF8520-I/PT, complementing the manufacturer datasheet with engineering guidance and parametric cross-reference data.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF8520-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 PIC18LF8520-I/PT (cùng hình factor và footprint) — khác nhau ở Package, I/O Pins, Operating Temperature, ADC, Core Architecture.
PIC18LF8520T-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F8520-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF8525-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF8621-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF6680-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF6722-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF8520-I/PT Tỷ lệ tối đa & tính chất điện
| Product Type | 8-bit Microcontroller (MCU) |
| Core Architecture | PIC18 (Enhanced RISC, Harvard) |
| Program Memory | 32 KB Flash |
| Data SRAM | 2048 bytes |
| Data EEPROM | 1024 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Supply Voltage (VDD) | 1.8 V to 5.5 V |
| I/O Pins | 68 |
| Hộp | 80-pin TQFP (12x12 mm) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| A/D Converter | 10-bit, multi-channel |
| Communication | 2x USART, MSSP (SPI/I2C) |
| Timers/PWM | 4x Timer modules with CCP/ECCP |
| Power-Saving Modes | nanoWatt technology (Sleep/Idle) |
| In-Circuit Programming | ICSP via RB6/RB7 |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC18LF8520-I/PT
| Chân 1 | RG0 — Digital I/O port G bit 0 |
| Chân 2 | RG1 — Digital I/O port G bit 1 |
| Chân 3 | RG2 — Digital I/O port G bit 2 |
| Chân 4 | RG3 — Digital I/O port G bit 3 |
| Chân 5 | RG4 — Digital I/O port G bit 4 |
| Chân 6 | VDD — Positive supply voltage |
| Chân 7 | VSS — Ground reference |
| Chân 8 | RG5 — Digital I/O port G bit 5 |
| Chân 9 | VSS — Ground reference |
| Chân 10 | RF7 — Digital I/O port F bit 7 |
| Chân 11 | RF6 — Digital I/O port F bit 6 |
| Chân 12 | RF5 — Digital I/O port F bit 5 |
| Chân 13 | RF4 — Digital I/O port F bit 4 |
| Chân 14 | RF3 — Digital I/O port F bit 3 |
| Chân 15 | RF2 — Digital I/O port F bit 2 |
| Chân 16 | RF1 — Digital I/O port F bit 1 |
| Chân 17 | RF0 — Digital I/O port F bit 0 |
| Chân 18 | AVDD — Analog positive supply |
| Chân 19 | AVSS — Analog ground |
| Chân 20 | RA0/AN0 — Digital I/O RA0 / A/D channel 0 |
| Chân 21 | RA1/AN1 — Digital I/O RA1 / A/D channel 1 |
| Chân 22 | RA2/AN2 — Digital I/O RA2 / A/D channel 2 |
| Chân 23 | RA3/AN3 — Digital I/O RA3 / A/D channel 3 |
| Chân 24 | RA4/AN4 — Digital I/O RA4 / A/D channel 4 |
| Chân 25 | RA5/AN5 — Digital I/O RA5 / A/D channel 5 |
| Chân 26 | RA6 — Digital I/O RA6 |
| Chân 27 | RA7 — Digital I/O RA7 |
| Chân 28 | VSS — Ground reference |
| Chân 29 | OSC1 — Crystal oscillator input |
| Chân 30 | OSC2 — Crystal oscillator output |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive supply voltage |
| Chân 33 | RB0/INT0 — Digital I/O RB0 / external interrupt 0 |
| Chân 34 | RB1/INT1 — Digital I/O RB1 / external interrupt 1 |
| Chân 35 | RB2/INT2 — Digital I/O RB2 / external interrupt 2 |
| Chân 36 | RB3 — Digital I/O RB3 |
| Chân 37 | RB4 — Digital I/O RB4 |
| Chân 38 | RB5 — Digital I/O RB5 |
| Chân 39 | RB6/PGC — Digital I/O RB6 / ICSP clock |
| Chân 40 | RB7/PGD — Digital I/O RB7 / ICSP data |
| Chân 41 | MCLR — Master clear (reset, active low) |
| Chân 42 | VDD — Positive supply voltage |
| Chân 43 | VSS — Ground reference |
| Chân 44 | RC0 — Digital I/O port C bit 0 |
| Chân 45 | RC1 — Digital I/O port C bit 1 |
| Chân 46 | RC2 — Digital I/O port C bit 2 |
| Chân 47 | RC3 — Digital I/O port C bit 3 |
| Chân 48 | RC4 — Digital I/O port C bit 4 |
| Chân 49 | RC5 — Digital I/O port C bit 5 |
| Chân 50 | RC6 — Digital I/O port C bit 6 |
| Chân 51 | RC7 — Digital I/O port C bit 7 |
| Chân 52 | RD0 — Digital I/O port D bit 0 |
| Chân 53 | RD1 — Digital I/O port D bit 1 |
| Chân 54 | RD2 — Digital I/O port D bit 2 |
| Chân 55 | RD3 — Digital I/O port D bit 3 |
| Chân 56 | RD4 — Digital I/O port D bit 4 |
| Chân 57 | RD5 — Digital I/O port D bit 5 |
| Chân 58 | RD6 — Digital I/O port D bit 6 |
| Chân 59 | RD7 — Digital I/O port D bit 7 |
| Chân 60 | VSS — Ground reference |
| Chân 61 | VDD — Positive supply voltage |
| Chân 62 | RE0 — Digital I/O port E bit 0 |
| Chân 63 | RE1 — Digital I/O port E bit 1 |
| Chân 64 | RE2 — Digital I/O port E bit 2 |
| Chân 65 | RE3 — Digital I/O port E bit 3 |
| Chân 66 | RE4 — Digital I/O port E bit 4 |
| Chân 67 | RE5 — Digital I/O port E bit 5 |
| Chân 68 | RE6 — Digital I/O port E bit 6 |
| Chân 69 | RE7 — Digital I/O port E bit 7 |
| Chân 70 | VSS — Ground reference |
| Chân 71 | VDD — Positive supply voltage |
| Chân 72 | RH0 — Digital I/O port H bit 0 |
| Chân 73 | RH1 — Digital I/O port H bit 1 |
| Chân 74 | RH2 — Digital I/O port H bit 2 |
| Chân 75 | RH3 — Digital I/O port H bit 3 |
| Chân 76 | RH4 — Digital I/O port H bit 4 |
| Chân 77 | RH5 — Digital I/O port H bit 5 |
| Chân 78 | RH6 — Digital I/O port H bit 6 |
| Chân 79 | RH7 — Digital I/O port H bit 7 |
| Chân 80 | RJ7 — Digital I/O port J bit 7 |
Ứng dụng tiêu biểu
PIC18LF8520-I/PT phù hợp cho 6 Áp dụngs: Industrial Control Panels, HVAC Thermostats and Climate Control, Automotive Body and HVAC Modules, Home Appliance Control Boards, Data Loggers and Sensor Hubs, Human-Machine Interface (HMI) Terminals.
Industrial Control Panels
The PIC18LF8520-I/PT suits industrial control panels with its 68 I/O count, dual USART for HMI master/slave links, and 32 KB Flash for ladder-logic-style firmware. Its 1.8V-5.5V supply range accepts both 3.3V regulated rails and 5V backplanes, while the -40C to +85C industrial grade tolerates cabinet and factory-floor temperatures. The 10-bit A/D reads panel-mounted sensor trims and potentiometers; CCP PWM channels drive indicator LED dimming and buzzer tones. With nanoWatt idle modes, the MCU can manage background panel polling while drawing only nanoamps, extending product life in unattended installations. The 80-pin TQFP footprint provides sufficient I/O headroom for matrix keypads, character LCD interfaces, and discrete optocoupler inputs typical of PLC-style panels.
Được đề xuất
HVAC Thermostats and Climate Control
The PIC18LF8520-I/PT is a strong fit for HVAC thermostats where multiple temperature sensors, humidity probes, and user-interface switches must be polled reliably. Its 10-bit A/D handles NTC thermistor bridges and analog humidity sensors, while two USARTs link a wall-mounted display board and a remote communication module. The 1.8V low-voltage operation enables direct battery or energy-harvesting supply from thermoelectric sources, and nanoWatt sleep currents under 100 nA preserve coin-cell life during idle periods. ECCP PWM modules drive TRIAC phase-control outputs for line-voltage heating/cooling stages. The wide operating temperature range of -40C to +85C covers attic and unconditioned-space installations where thermostats are commonly deployed.
Được đề xuất
Automotive Body and HVAC Modules
In automotive body controllers and HVAC head units, the PIC18LF8520-I/PT delivers the I/O count and communication flexibility required for driving multiple motors, fans, and indicator lamps. Its dual USART interfaces to LIN bus transceivers or CAN bridge ICs, while CCP/ECCP modules generate PWM for blower motor speed control and lighting dimming. The 32 KB Flash accommodates LIN/J2602 stack firmware plus application logic. -40C to +85C operation is suitable for cabin and engine-bay-adjacent mounting. For underhood modules requiring 125C support, Microchip's PIC18F-K series with AEC-Q100 qualification is the recommended upgrade; the PIC18LF8520 remains ideal for non-safety body and HVAC functions.
Được đề xuất
Home Appliance Control Boards
The PIC18LF8520-I/PT powers white-goods controllers in washing machines, dishwashers, and refrigerators where motor control, sensor interfaces, and user display coordination run concurrently. Its four timer/capture modules handle triac-based heater phase control, motor tach feedback, and encoder inputs. 32 KB Flash holds state-machine firmware and diagnostics, while 2048 bytes of SRAM buffers display strings and sensor histories. Dual USARTs link to inverter boards and Wi-Fi/Bluetooth modules for IoT-connected appliances. The 80-pin TQFP gives designers room for segmented LCD drive, buzzer PWM, and safety-relay outputs. -40C to +85C operation covers garage and unheated laundry-room installations.
Được đề xuất
Data Loggers and Sensor Hubs
The PIC18LF8520-I/PT is well-suited for industrial data loggers that periodically sample sensors, timestamp entries, and store results to external EEPROM or SD cards. Its 10-bit A/D reads analog process variables, while MSSP (SPI) drives SD card interfaces at high speed, and the second USART outputs data to radios or wired telemetry. nanoWatt sleep currents below 1 uA enable multi-year battery life on duty-cycled logging intervals (e.g., 1 sample per minute). The 1024-byte data EEPROM stores configuration parameters non-volatilely without external storage. ICSP allows field firmware updates without dismantling deployed units, critical for remote environmental monitoring stations and utility metering infrastructure.
Được đề xuất
Human-Machine Interface (HMI) Terminals
The PIC18LF8520-I/PT drives HMI terminals that combine character or graphical LCDs, matrix keypads, status LEDs, and serial links to host controllers. With 68 I/O and dual USART, it can simultaneously drive a 4x20 character LCD via parallel port, scan a 4x4 keypad via analog mux inputs, and maintain a Modbus RTU link to a PLC. The 10-bit A/D reads potentiometer settings and analog trim pots. nanoWatt sleep modes reduce quiescent draw when the HMI is idle but still powered, saving energy in 24/7 industrial environments. The 80-pin TQFP and ample Flash make it a cost-effective alternative to higher-pin-count ARM Cortex-M parts for non-graphical HMI screens.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF8520-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 | PIC18LF8520T-I/PT | PIC18F8520-I/PT | PIC18LF8525-I/PT | PIC18LF8621-I/PT | PIC18LF6680-I/PT |
|---|---|---|---|---|---|---|
| Package | 80-TQFP (12x12 mm) | 80-TQFP (same) | 80-TQFP (same) | 80-TQFP (same) | 80-TQFP (same) | 80-TQFP (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 32 KB | 32 KB | 32 KB | 48 KB | 64 KB | 16 KB |
| Data SRAM | 2048 bytes | 2048 bytes | 2048 bytes | 3328 bytes | 3936 bytes | 1024 bytes |
| Supply Voltage Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 4.2 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 2.0 V to 5.5 V |
| Maximum CPU Speed | 40 MHz (10 MIPS) | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| I/O Pins | 68 | 68 | 68 | 68 | 68 | 68 |
| Communication | 2x USART, MSSP (SPI/I2C) | 2x USART, MSSP | 2x USART, MSSP | 2x USART, MSSP | 2x USART, 2x MSSP | 2x USART, MSSP |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Bảo phân biệt quan trọng
- Industry-standard 80-pin TQFP pinout shared across PIC18F85xx family (vsPIC18LF45K50-I/PT)
- Wide 1.8V-5.5V supply range covers both battery-backed and legacy 5V designs (vsPIC18F8520-I/PT (F variant))
- nanoWatt technology with sub-microamp sleep current (vsPIC18LF6680-I/PT)
Ghi chú thiết kế
Place a 100 nF ceramic decoupling capacitor on every VDD/AVDD pin and a single 10 uF bulk tantalum or ceramic capacitor at the supply entry point. The PIC18LF8520 has multiple VDD pairs distributed across the 80-pin TQFP; missing any pair causes supply droop during current spikes and can trigger unexpected brown-out resets. Use a star-ground topology with separate analog (AVSS) and digital (VSS) returns tied at a single point near the MCU.
Do not leave the MCLR pin floating. Tie MCLR to VDD through a 10 kohm pull-up resistor and place a 100 nF capacitor to VSS close to the pin for noise immunity. Floating MCLR is the most common cause of spurious resets in PIC18F designs. The ICSP clock and data pins (RB6/PGC, RB7/PGD) are shared with general I/O and must be free of strong pull-ups/downs during programming to avoid contention with the programmer.
Route the crystal/oscillator traces (OSC1/OSC2) symmetrically and keep them short with a guard ring tied to VSS to minimize coupling. Place the crystal within 5-10 mm of the MCU; longer traces increase jitter and EMI. For high-EMI environments, use a 4-layer PCB with a dedicated ground plane beneath the oscillator traces and avoid routing signal lines under the crystal footprint.
The PIC18LF8520-I/PT in 80-TQFP has a thermal resistance of approximately 50 C/W (theta_JA), suitable for typical embedded loads (under 50 mA) without special thermal management. At maximum CPU activity and 40 MHz, supply current is roughly 15-20 mA, dissipating under 100 mW at 5 V - well within thermal limits. For sustained full-load at 5 V in enclosed housings, provide at least 1 square inch of copper pour beneath the exposed pad row for additional heat spreading.
Thông tin tuân thủ
RoHS/REACH compliance per Microchip product page. Industrial temperature grade -40C to +85C (suffix -I). Not AEC-Q100 qualified; for AEC-Q100 automotive use, select PIC18F-K series variants.