PIC18F4520-I/PT - 8-Bit MCU 32KB Flash 40MHz TQFP-44
MPN: PIC18F4520-I/PT ✓ Hoạt độngPIC18F4520-I/PT Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile Flash program memory, volatile SRAM, EEPROM, and a rich peripheral set (timers, A/D, USART, I2C, SPI, PWMs, and I/O ports) into one package. The PIC18F sits in the upper tier of Microchip's 8-bit portfolio, offering nanoWatt power management, 10-bit ADC, and Extended Instruction Set capability. It belongs to the broader category of embedded controllers in the power management and microcontroller pyramid, used whenever a deterministic, low-cost control plane is needed.
Key differentiating features include 36 digital I/O pins, a 13-channel 10-bit A/D converter with 100 ksamples/s throughput, two analog comparators, two CCP modules and one ECCP module, hardware USART with LIN support, MSSP for SPI/I2C, and four timer modules (one 8-bit, three 16-bit). The Enhanced Flash supports 100K erase/write cycles typical and self-programmability under firmware control, enabling bootloaders and field updates without external programmers.
The architecture uses a 16-bit program path and an 8-bit data path, with 31 interrupt vectors and a vectored priority scheme. The ADC can be triggered from a dedicated timer for deterministic sampling. With five operating modes (Run, Idle, Sleep, Doze, and RC_RUN) plus the nanoWatt regulator, the device typically draws 7 µA in Sleep and 1.6 mA at 4 MHz/3.3 V, allowing years of operation from a battery in sensor applications.
Typical applications include industrial control panels, sensor hubs with analog front-end conditioning, automotive body and HVAC sub-systems, USB-to-UART bridges, motor control driver boards, and consumer white goods where deterministic performance, low BOM cost, and long-term firmware stability are required. The wide operating range (2.0 V to 5.5 V) makes the PIC18F4520 equally comfortable in 3.3 V battery-backed and 5 V mains-referenced designs.
When designing with this part, observe the boundary-scan rules in the in-circuit debug header (ICD/ICSP) and provide adequate decoupling: place a 100 nF ceramic as close as possible to each VDD/VSS pair plus a 10 µF bulk on the main rail. The PLCC vs TQFP package choice affects socket availability and PCB rework; pick PT (TQFP-44) for surface-mount production and keep I/P (DIP-40) only for breadboard prototypes.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho PIC18F4520-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 PIC18F4520-I/PT (cùng hình factor và footprint) — khác nhau ở Package, Timers, Core Architecture, Operating Temperature, Program Memory (Flash).
PIC18F4520-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4520-E/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4620-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4525-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F458-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F4520-I/PT Tỷ lệ tối đa & tính chất điện
| Core | PIC18 (8-bit, Harvard) |
| Instruction Set | 75 instructions, 16-bit opcodes |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM (SRAM) | 1.5 KB (1536 bytes) |
| EEPROM | 256 bytes |
| Maximum CPU Clock | 40 MHz (10 MIPS per 4 clocks) |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 36 |
| ADC | 10-bit, up to 13 channels |
| Analog Comparators | 2 |
| CCP / ECCP Modules | 2 CCP + 1 ECCP |
| Timers | 1x 8-bit + 3x 16-bit + WDT |
| Communication | EUSART (LIN-capable), MSSP (SPI/I2C) |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 44-pin TQFP (PT), 10x10 mm, 0.8 mm pitch |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 3 (168 hours) |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes (Pb-free matte tin) |
| In-Circuit Debug | ICD/ICSP two-wire interface |
Cấu hình chân PIC18F4520-I/PT
| Chân 1 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Chân 2 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Chân 3 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / A/D reference minus |
| Chân 4 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / A/D reference plus |
| Chân 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 6 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Chân 7 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| Chân 8 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input 6 |
| Chân 9 | RE2/CS/AN7 — PORTE bit 2 / Chip select / Analog input 7 |
| Chân 10 | VDD — Digital supply voltage (2.0-5.5 V) |
| Chân 11 | VSS — Digital ground |
| Chân 12 | OSC1/CLKI/RA7 — Oscillator input / external clock in / PORTA bit 7 |
| Chân 13 | OSC2/CLKO/RA6 — Oscillator output / clock out / PORTA bit 6 |
| Chân 14 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Chân 15 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 I/O |
| Chân 16 | RC2/CCP1 — PORTC bit 2 / CCP1 I/O |
| Chân 17 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 18 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 19 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 20 | RC6/TX/CK — PORTC bit 6 / EUSART TX / EUSART clock |
| Chân 21 | RC7/RX/DT — PORTC bit 7 / EUSART RX / EUSART data |
| Chân 22 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| Chân 23 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| Chân 24 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| Chân 25 | RB3/CCP2/MD — PORTB bit 3 / CCP2 I/O / ICSP data |
| Chân 26 | RB4/KB10 — PORTB bit 4 / interrupt-on-change / keypad row |
| Chân 27 | RB5/KB11/PGM — PORTB bit 5 / interrupt-on-change / ICSP clock |
| Chân 28 | RB6/KB12/PGC — PORTB bit 6 / ICSP clock / interrupt-on-change |
| Chân 29 | RB7/KB13/PGD — PORTB bit 7 / ICSP data / interrupt-on-change |
| Chân 30 | AVDD — Analog supply voltage |
| Chân 31 | AVSS — Analog ground |
| Chân 32 | VDD — Digital supply voltage |
| Chân 33 | VSS — Digital ground |
| Chân 34 | RD0/PSP0 — PORTD bit 0 / Parallel slave port bit 0 |
| Chân 35 | RD1/PSP1 — PORTD bit 1 / Parallel slave port bit 1 |
| Chân 36 | RD2/PSP2 — PORTD bit 2 / Parallel slave port bit 2 |
| Chân 37 | RD3/PSP3 — PORTD bit 3 / Parallel slave port bit 3 |
| Chân 38 | RD4/PSP4 — PORTD bit 4 / Parallel slave port bit 4 |
| Chân 39 | RD5/PSP5 — PORTD bit 5 / Parallel slave port bit 5 |
| Chân 40 | RD6/PSP6 — PORTD bit 6 / Parallel slave port bit 6 |
| Chân 41 | RD7/PSP7 — PORTD bit 7 / Parallel slave port bit 7 |
| Chân 42 | MCLR/VPP — Master clear reset / ICSP programming voltage |
| Chân 43 | VDD — Digital supply voltage |
| Chân 44 | VSS — Digital ground |
Ứng dụng tiêu biểu
PIC18F4520-I/PT phù hợp cho 6 Áp dụngs: Industrial Control Panels, Sensor Hubs and Data Loggers, USB-to-UART Bridge / Field Programmers, HVAC and Building Automation Sub-systems, Automotive Body Control Sub-modules, Consumer Electronics and Appliance UI.
Industrial Control Panels
The PIC18F4520-I/PT is well suited to industrial control panels thanks to its 44-pin TQFP industrial temperature rating (-40 C to +85 C), 5 V tolerance, and abundant parallel I/O (36 pins). It comfortably drives 7-segment or character LCDs through its 4 timers, while the 13-channel 10-bit ADC reads analog sensor inputs (pressure, temperature, current) directly. Its deterministic interrupt response and 32 KB Flash accommodate ladder-logic-style or IEC 61131 firmware for PLC-style sub-systems. Use it where a deterministic 8-bit control plane replaces external logic ICs, reducing BOM cost by 30-50%.
Được đề xuất
Sensor Hubs and Data Loggers
With 32 KB Flash and 1.5 KB SRAM, the PIC18F4520-I/PT is ideal for low-power sensor hubs and battery data loggers. The 13-channel 10-bit ADC supports arrays of thermistors, photocells, and strain gauges, while the MSSP block streams buffered samples to an external SPI Flash (e.g. 25LC256/25Q128). The nanoWatt sleep current (~7 µA) combined with RTCC wake sources delivers multi-year coin-cell operation in unattended field deployments. A/DSample triggered from CCP keeps data timestamps jitter-free.
Được đề xuất
USB-to-UART Bridge / Field Programmers
Although the PIC18F4520 itself lacks USB, it pairs naturally with a CP2102 or FT230X USB-to-UART bridge to deliver rugged field-programming instruments and console converters. Its 5 V-tolerant UART and 40 MHz CPU allow comfortable 921.6 kbaud rates over RS-232 with hardware flow control. Combined with the ICSP/ICD programming pins, a single TQFP-44 board doubles as an isolated serial gateway and a PIC programmer target. This is a classic XAIPART reference pattern for industrial comms bricks.
Được đề xuất
HVAC and Building Automation Sub-systems
Building automation sub-systems (fan controller boards, zone thermostats, occupancy hub nodes) fit the PIC18F4520-I/PT footprint thanks to its 5 V-tolerant I/O driving triacs and opto-couplers directly. The 1.5 KB SRAM holds filtered sensor state and LIN/network frames, while the EUSART LIN 1.2 master capability supports industry-standard HB-LED drivers and small fan clusters. Up to four PWM channels (via CCP/ECCP) handle closed-loop motor control up to tens of kHz. Industrial temperature grade ensures reliable closet-above-ceiling operation.
Được đề xuất
Automotive Body Control Sub-modules
For non-CAN automotive body sub-modules (window lifters, seat adjusters, mirror controls, interior LED dimmers), the -E/PT variant of the PIC18F4520 in the same TQFP-44 pinout carries the +125 C temperature grade. The Enhanced Flash supports over-the-air reflash through a bootloader, and the EUSART LIN 1.3 master handles Body & Chassis sub-bus communication. The internal ADC reads 13 analog sensors (door switch, hall-effect position, current sense), and the ECCP module generates drive PWM up to 10-bit precision.
Được đề xuất
Consumer Electronics and Appliance UI
The PIC18F4520-I/PT powers appliance UI controllers (washing machines, microwaves, induction cooktops, dispensers) where deterministic 8-bit response, robust 5 V I/O, and modest BOM cost matter more than raw clock speed. Drives character LCDs directly via the 4-bit parallel interface, scans matrix keypads through ADCs with debouncing firmware, and uses the 4 timers for beeper tones and motor PWM. Industrial-grade MTBF and the development ecosystem of MPLAB-X IDE also accelerate time-to-market for new product spins.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F4520-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 | PIC18F4520-E/PT | PIC18F4620-I/PT | PIC18F4525-I/PT | PIC18F458-I/PT | PIC18F4520-I/P |
|---|---|---|---|---|---|---|
| Package | 44-pin TQFP (PT), 10x10 mm | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | DIP-40 - different (not TQFP-44) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash Memory | 32 KB | 32 KB | 64 KB | 48 KB | 32 KB | 32 KB |
| RAM (SRAM) | 1.5 KB (1536 B) | 1.5 KB | 3.9 KB | 2.5 KB | 1.5 KB | 1.5 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) |
| CAN Controller | No | No | No | No | Yes (CAN 2.0B) | No |
| USB Controller | No | No | No | No | No | No |
| Lifecycle Status | Active | Active | Active | Active | Active | Active |
Bảo phân biệt quan trọng
- Largest Flash in the 44-pin PT pin-compatible family without CAN (vsPIC18F4525-I/PT)
- Pure drop-in upgrade path over the older PIC18F452 (vsPIC18F452)
- Does not integrate CAN - lower cost vs PIC18F4580 family (vsPIC18F458-I/PT)
Ghi chú thiết kế
Estimated: at 5 V VDD and a typical 5 mA active current budget, the PIC18F4520 dissipates approximately 25 mW - well within the TQFP-44's thermal headroom. Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD/VSS pair (pins 10/11, 30/31, 32/33, 43/44) plus a single 10 µF bulk capacitor on the main supply rail to handle inrush during ADC bursts. Place a ferrite bead in series with AVDD if analog performance is critical, since AVDD noise directly couples into the 10-bit ADC result.
The ICSP/ICD pins (RB6/PGC, RB7/PGD, MCLR/VPP) must be accessible in-circuit for programming and debugging. Add a 4.7 kΩ pull-up on MCLR/VPP and isolate any strong pull-down on these pins during reset. PORTB pins have weak internal pull-ups configurable via the RBPU bit; remember that digital inputs should not float when using PORTB interrupt-on-change, otherwise spurious interrupts may fire. The MSSP I2C pins (RC3/RC4) need 4.7 kΩ pull-ups to VDD since the I2C module only supports open-drain operation.
Estimated: with a 0.8 mm TQFP pin pitch, route all power traces at least 0.2 mm wide and stagger signal traces between layers to avoid parallel high-current motor PWM traces right beneath the MCU's analog pins. Place a copper polygon covering the thermal pad area on the bottom layer to spread heat - although the dissipation is modest for a pure control MCU, the same copper plane doubles as an EMI shield against switching converters on the same board. Keep the crystal/oscillator traces (OSC1/OSC2) within 5 mm of the MCU pins and guard them with a GND ring.
Thông tin tuân thủ
RoHS compliant per Microchip product page; -I/PT is industrial temperature grade (-40/+85 C), not AEC-Q100. For automotive temperature range use the -E/PT variant. Lead-free matte-tin (Pb-free) finish.
