PIC18F452-I/L - 8-bit 40MHz 32KB Flash MCU | Microchip 44-PLCC
MPN: PIC18F452-I/L ✓ Hoạt độngPIC18F452-I/L Tóm tắt
A microcontroller is a single-chip computer that combines a CPU, memory, and programmable peripherals. The PIC18F452 belongs to the 8-bit MCU class within the broader microcontroller hierarchy (8-bit MCU -> MCU -> embedded processor -> semiconductor). Its enhanced PIC18 core offers 77 single-word instructions and C-compiler-friendly architecture, making it popular for both educational and industrial designs.
Key features include eight channels of 10-bit analog-to-digital conversion, two capture/compare/PWM modules, an MSSP configurable as SPI or I2C, a USART, an ICD (in-circuit debugger) interface, and self-programming flash. Operating voltage spans 4.2 V to 5.5 V, and the device supports nanoWatt power management for low-power applications.
The architecture is a Harvard-type RISC design with a 16-bit instruction word and an 8-bit data path, allowing 100 ns instruction execution at 40 MHz. The wide operating range and rich peripheral set make it suitable for industrial automation, motor control, sensor conditioning, and consumer products requiring deterministic real-time response without an external DSP.
Typical applications include industrial control panels, HVAC systems, motor-control boards, USB-to-serial bridges with an external interface IC, and instrumentation front-ends. Designers value the PIC18F452 for upward code compatibility with PIC16C5X, PIC12CXXX, PIC16CXX, and PIC17CXX devices.
A key design consideration is the operating voltage: the 'I' suffix denotes an industrial temperature range of -40 C to +85 C and 4.2 V to 5.5 V supply. Designers migrating to the 'LF' variant must account for the 2.0 V to 5.5 V extended range.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet, supporting faster BOM decisions and supply-chain risk mitigation for the PIC18F452-I/L.
Bộ thay thế dễ dàng lắp đặt cho PIC18F452-I/L — 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 PIC18F452-I/L (cùng hình factor và footprint) — khác nhau ở Package, Operating Temperature, Timers, Mounting Type, Core Architecture.
PIC18F452-E/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F452T-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F448-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F458-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F442-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F452-I/L Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC18 (8-bit Harvard RISC) |
| Tần số xung maksimum | 40 MHz (10 MIPS) |
| Program Memory (Flash) | 32 KB (16K x 16 words) |
| Data SRAM | 1536 bytes |
| Data EEPROM | 256 bytes |
| I/O Pins | 34 |
| Điện áp cung cấp | 4.2 V to 5.5 V |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Analog-to-Digital Converter | 10-bit, 8 channels |
| Capture/Compare/PWM Modules | 2 CCP |
| Serial Interfaces | MSSP (SPI / I2C), USART |
| Timers | 1 x 8-bit, 3 x 16-bit |
| Hộp | 44-pin PLCC (16.59 x 16.59 mm) |
| Kiểu lắp đặt | Surface Mount (PLCC socket compatible) |
| Instruction Set | 77 single-word instructions |
| Self-Programming / ICD | Yes |
| Power-Saving Modes | nanoWatt technology |
Cấu hình chân PIC18F452-I/L
| Chân 1 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / ADC VREF- |
| Chân 2 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| Chân 3 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 4 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Chân 5 | RA6/OSC2/CLKO — PORTA bit 6 / Oscillator output |
| Chân 6 | RA7/OSC1/CLKI — PORTA bit 7 / Oscillator input |
| Chân 7 | VSS — Ground reference |
| Chân 8 | VDD — Positive supply (5 V) |
| Chân 9 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| Chân 10 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| Chân 11 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| Chân 12 | RB3/CCP2 — PORTB bit 3 / CCP2 output |
| Chân 13 | RB4 — PORTB bit 4 |
| Chân 14 | RB5/PGM — PORTB bit 5 / LVP programming |
| Chân 15 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 16 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 17 | VSS — Ground reference |
| Chân 18 | VDD — Positive supply (5 V) |
| Chân 19 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator |
| Chân 20 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator / CCP2 |
| Chân 21 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| Chân 22 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 25 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Chân 26 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Chân 27 | VSS — Ground reference |
| Chân 28 | VDD — Positive supply (5 V) |
| Chân 29 | RD0/PSP0 — PORTD bit 0 / Parallel slave port 0 |
| Chân 30 | RD1/PSP1 — PORTD bit 1 / Parallel slave port 1 |
| Chân 31 | RD2/PSP2 — PORTD bit 2 / Parallel slave port 2 |
| Chân 32 | RD3/PSP3 — PORTD bit 3 / Parallel slave port 3 |
| Chân 33 | RD4/PSP4 — PORTD bit 4 / Parallel slave port 4 |
| Chân 34 | RD5/PSP5 — PORTD bit 5 / Parallel slave port 5 |
| Chân 35 | RD6/PSP6 — PORTD bit 6 / Parallel slave port 6 |
| Chân 36 | RD7/PSP7 — PORTD bit 7 / Parallel slave port 7 |
| Chân 37 | VSS — Ground reference |
| Chân 38 | VDD — Positive supply (5 V) |
| Chân 39 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| Chân 40 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input 6 |
| Chân 41 | RE2/CS/AN7 — PORTE bit 2 / Chip select / Analog input 7 |
| Chân 42 | VSS — Ground reference |
| Chân 43 | VDD — Positive supply (5 V) |
| Chân 44 | MCLR/VPP — Master clear reset / Programming voltage |
Ứng dụng tiêu biểu
PIC18F452-I/L phù hợp cho 6 Áp dụngs: Industrial Control Panels, HVAC Climate Control Boards, Motor Control Drive Boards, Instrumentation Front-Ends, USB-to-Serial Bridge Bridges, Consumer Appliance Controllers.
Industrial Control Panels
The PIC18F452-I/L is widely deployed in industrial control panels where its 34 I/O pins, 8 channels of 10-bit ADC, and 4.2-5.5 V supply range align directly with 24 V-sourced 5 V industrial rails. The 10 MIPS throughput supports real-time polling of sensor inputs, debounce logic, and PWM-driven relay or indicator outputs. Its 256-byte EEPROM stores calibration constants that survive power-cycle events, while self-programming flash enables field firmware updates without removing the MCU from the panel.
Được đề xuất
HVAC Climate Control Boards
HVAC controller boards leverage the PIC18F452-I/L's 8-channel ADC to read multiple temperature and pressure sensors simultaneously, while its two CCP modules generate PWM signals for fan-speed control and damper actuation. The 32 KB flash accommodates lookup-table-based climate curves and scheduling algorithms, and the nanoWatt power-saving modes reduce standby consumption in thermostat-style products operating from a 5 V wall adapter.
Được đề xuất
Motor Control Drive Boards
The PIC18F452-I/L drives small brushless DC and stepper motor boards via its two CCP/PWM channels, complemented by three 16-bit timers for quadrature encoder feedback and commutation sequencing. Its 40 MHz operation yields 100 ns instruction execution, enabling deterministic commutation loops at typical 20 kHz PWM frequencies without software jitter. The 5 V supply aligns directly with logic-level gate drivers commonly used in low-voltage motion subsystems.
Được đề xuất
Instrumentation Front-Ends
Bench-top instrumentation uses the PIC18F452-I/L as a controller for signal conditioning, range selection, and display driving. The 10-bit ADC provides 1024-step resolution suitable for digital multimeters and panel meters, while the MSSP peripheral interfaces with serial ADCs or DACs that demand higher precision. The 1536-byte SRAM supports circular buffers for waveform capture or data-logging applications in test equipment.
Được đề xuất
USB-to-Serial Bridge Bridges
When paired with an external USB-serial interface IC such as the FT232R or MCP2200, the PIC18F452-I/L functions as the protocol conversion controller for legacy RS-232 equipment. Its USART module handles asynchronous serial communication, while flash-resident command interpreters expose the bridge to host PCs. The 32 KB flash holds USB-class descriptor templates and any vendor-specific command sets required by the legacy peripheral.
Được đề xuất
Consumer Appliance Controllers
Small kitchen and white-goods appliances embed the PIC18F452-I/L for user-interface multiplexing, sensor reading, and actuator PWM. Its 34 I/O pins drive 7-segment displays, keypad matrices, and indicator LEDs, while the ADC monitors thermistors, level sensors, and current-sensing shunts. The industrial temperature grade supports under-cabinet installation where ambient temperatures can approach 80 C during operation.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F452-I/L — 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 | PIC18F452-E/L | PIC18F452T-I/L | PIC18F448-I/L | PIC18F458-I/L | PIC18F442-I/L |
|---|---|---|---|---|---|---|
| Package | 44-PLCC (16.59x16.59 mm) | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Architecture | PIC18 (8-bit) | PIC18 (8-bit) | PIC18 (8-bit) | PIC18 (8-bit) | PIC18 (8-bit) | PIC18 (8-bit) |
| Maximum Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Program Memory (Flash) | 32 KB | 32 KB | 32 KB | 32 KB | 48 KB | 16 KB |
| Data SRAM | 1536 bytes | 1536 bytes | 1536 bytes | 1536 bytes | 2560 bytes | 768 bytes |
| Data EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| CAN Peripheral | No | No | No | Yes (CAN 2.0B) | Yes (CAN 2.0B) | No |
| Operating Temperature | -40 C to +85 C | -40 C to +125 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
- Industrial temperature grade with widest Microchip distributor availability (vsPIC18F452-E/L)
- Adds CAN 2.0B peripheral for networked industrial designs (vsPIC18F448-I/L)
- Larger flash and SRAM headroom with same 44-PLCC footprint (vsPIC18F458-I/L)
Ghi chú thiết kế
The PIC18F452-I/L requires a stable 5 V supply between 4.2 V and 5.5 V. Place a 100 nF decoupling capacitor as close as possible to each VDD/VSS pair (pins 8, 18, 28, 38, 43), plus a bulk 10 uF tantalum or ceramic capacitor at the regulator output. During nanoWatt sleep modes, VDD must remain within specification to preserve SRAM contents and EEPROM write integrity.
For 40 MHz operation, use a 10 MHz crystal with the on-chip 4x PLL enabled via the OSCCON register. The HS oscillator mode supports 4 MHz to 25 MHz fundamental crystals; combine with PLL for full 40 MHz. Without PLL, an external 40 MHz clock source must be supplied to OSC1. The 22 pF load capacitors on OSC1/OSC2 should be sized per crystal manufacturer recommendations.
In-Circuit Debugging (ICD) uses pins PGC (RB6) and PGD (RB7). Series resistors (typically 4.7 kOhm) between the debugger and the target are recommended for production boards to isolate the ICSP signals from application circuitry. The MCLR/VPP pin must be pulled high through a resistor (typically 10 kOhm) and accessible for programming voltage during debug sessions.
Estimated: At 40 MHz with all peripherals active, the PIC18F452-I/L typically draws 25-35 mA; in nanoWatt sleep mode this drops to under 5 uA. Always verify MCLR is decoupled with a 100 nF capacitor to prevent spurious resets during supply transients. PORTD pins configured as the Parallel Slave Port must have their TRISD bits set correctly or unexpected bus contention can occur when interfacing external memory.
Thông tin tuân thủ
RoHS and REACH compliance per Microchip product declaration. PLCC package is lead-free. AEC-Q100 not applicable for industrial-grade MCU. MSL-3 moisture sensitivity per JEDEC J-STD-020.
