PIC18LF452-I/L - 8-bit PIC MCU, 32KB Flash, 44-PLCC | Microchip
MPN: PIC18LF452-I/L ✓ Hoạt độngPIC18LF452-I/L Tóm tắt
A PIC microcontroller is a Harvard-architecture CMOS RISC device that separates program and data memory buses, allowing simultaneous fetch and access. The PIC18 family is the upper tier of Microchip's 8-bit line, introducing 16-bit opcodes, a hardware multiplier, linear code space, and priority-enabled interrupts. The 'LF' suffix denotes an extended-voltage variant that runs at lower VDD (down to 2.0V), making it the right choice for battery-powered or low-voltage systems where the standard 'F' part would lose regulation. The PIC18LF452 sits in the family hierarchy as: PIC microcontroller -> PIC18 family -> PIC18F452 sub-family -> PIC18LF452 (low-voltage F452).
Key features include 32KB (16K x 16) Flash program memory, 1536 bytes of RAM, 256 bytes of EEPROM, 34 digital I/O pins, a 10-bit 8-channel Analog-to-Digital Converter (ADC), two analog comparators, two Capture/Compare/PWM (CCP) modules, an Enhanced Capture/Compare/PWM (ECCP) module, one USART, one MSSP (Master Synchronous Serial Port) for SPI/I2C, two 8-bit timers and three 16-bit timers, a parallel slave port, and an ICD (In-Circuit Debugger) interface. The instruction cycle time of 100 ns (at 40 MHz) gives deterministic timing for motor control and instrumentation loops.
Architecturally, the PIC18LF452-I/L uses a 16-bit instruction word and an 8-bit data path with a hardware multiply (8 x 8 in one cycle). The wide 2.5V/3.3V/5V operating range, combined with nanoWatt power-management modes (Sleep, Idle, and peripheral gating), supports low-power sensor and remote-monitoring nodes. The ADC's 10-bit resolution is adequate for thermocouple/thermistor front-ends and basic instrumentation, while the ECCP module delivers the PWM resolution needed for switched-mode power and motor drive.
Typical applications include industrial control panels, motor control (DC, stepper, BLDC), HVAC blowers and actuators, automotive body electronics (non-safety), sensor conditioning front-ends, instrument clusters, security panels, and general-purpose embedded control boards. The 44-pin PLCC package supports a through-hole socket for prototyping or field-replaceable designs, which is common in legacy industrial and aerospace instrumentation.
When designing with this part, verify the operating voltage range carefully: the 'F' variant operates from 4.2V to 5.5V, while the 'LF' variant runs from 2.0V to 5.5V. Use decoupling on each VDD/VSS pair, place the 20 MHz (or appropriate) resonator within 1 cm of OSC1/OSC2, and route the ICP/ICD signals away from switching nodes to preserve debug-session stability.
This page synthesizes distributor stock, parametric comparison, and drop-in alternatives not found in any single manufacturer datasheet - giving engineers a faster cross-reference path than manual datasheet correlation.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF452-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 PIC18LF452-I/L (cùng hình factor và footprint) — khác nhau ở Mounting Type, Timers, Operating Temperature, ADC, Program Memory (Flash).
PIC18LF452-E/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F452-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F452T-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F452T-E/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF452-I/L Tỷ lệ tối đa & tính chất điện
| Core | PIC 8-bit RISC |
| Family | PIC18 (PIC18F452 sub-family, LF = extended low-voltage) |
| Program Memory (Flash) | 32 KB (16K x 16 words) |
| RAM | 1536 bytes |
| EEPROM | 256 bytes |
| Max CPU Speed | 40 MHz (10 MIPS) |
| Instruction Cycle | 100 ns @ 40 MHz |
| Supply Voltage (VDD) | 2.0 V to 5.5 V (LF extended range; 2.5V/3.3V/5V nominal) |
| I/O Pins | 34 |
| ADC | 10-bit, 8 channels |
| Timers | 2 x 8-bit + 3 x 16-bit |
| CCP/ECCP | 2 CCP + 1 ECCP |
| Serial | 1 USART (RS-232/RS-485), 1 MSSP (SPI / I2C) |
| Comparators | 2 analog comparators |
| Parallel Slave Port | Yes |
| In-Circuit Debug | ICD/ICSP |
| Nhiệt độ hoạt động | -40 C to +85 C (industrial, 'I' suffix) |
| Hộp | 44-pin PLCC (16.59 x 16.59 mm) |
| Kiểu lắp đặt | Surface Mount (PLCC socket compatible) |
| Cấp MSL | 3 |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân PIC18LF452-I/L
| Chân 1 | RB3/CCP2 — Digital I/O / Capture-Compare-PWM channel 2 |
| Chân 2 | RB4 — Digital I/O |
| Chân 3 | RB5 — Digital I/O |
| Chân 4 | RB6/PGC — Digital I/O / ICSP clock (ICD programming) |
| Chân 5 | RB7/PGD — Digital I/O / ICSP data (ICD programming) |
| Chân 6 | RB8 — Digital I/O |
| Chân 7 | RB9 — Digital I/O |
| Chân 8 | VSS — Ground |
| Chân 9 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / clock input |
| Chân 10 | RC1/T1OSI — Digital I/O / Timer1 oscillator input |
| Chân 11 | RC2/CCP1 — Digital I/O / Capture-Compare-PWM 1 |
| Chân 12 | RC3 — Digital I/O / SPI/I2C clock |
| Chân 13 | RC4 — Digital I/O / SPI/I2C data |
| Chân 14 | RC5 — Digital I/O |
| Chân 15 | RC6 — Digital I/O / USART TX |
| Chân 16 | RC7 — Digital I/O / USART RX |
| Chân 17 | VSS — Ground |
| Chân 18 | RD0 — Digital I/O / Parallel Slave Port data 0 |
| Chân 19 | RD1 — Digital I/O / Parallel Slave Port data 1 |
| Chân 20 | RD2 — Digital I/O / Parallel Slave Port data 2 |
| Chân 21 | RD3 — Digital I/O / Parallel Slave Port data 3 |
| Chân 22 | RD4 — Digital I/O / Parallel Slave Port data 4 |
| Chân 23 | RD5 — Digital I/O / Parallel Slave Port data 5 |
| Chân 24 | RD6 — Digital I/O / Parallel Slave Port data 6 |
| Chân 25 | RD7 — Digital I/O / Parallel Slave Port data 7 |
| Chân 26 | VSS — Ground |
| Chân 27 | RE0/RD — Digital I/O / Parallel Slave Port read |
| Chân 28 | RE1/WR — Digital I/O / Parallel Slave Port write |
| Chân 29 | RE2/CS — Digital I/O / Parallel Slave Port chip select |
| Chân 30 | AVSS — Analog ground |
| Chân 31 | RA0/AN0 — Digital I/O / Analog input 0 |
| Chân 32 | RA1/AN1 — Digital I/O / Analog input 1 |
| Chân 33 | RA2/AN2/VREF- — Digital I/O / Analog input 2 / ADC VREF- |
| Chân 34 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC VREF+ |
| Chân 35 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Chân 36 | RA5/AN4 — Digital I/O / Analog input 4 |
| Chân 37 | OSC2/CLKOUT — Crystal output / clock output |
| Chân 38 | OSC1/CLKIN — Crystal input / external clock input |
| Chân 39 | VDD — Positive supply |
| Chân 40 | RB0/INT0 — Digital I/O / External interrupt 0 |
| Chân 41 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Chân 42 | RB2/INT2 — Digital I/O / External interrupt 2 |
| Chân 43 | MCLR/VPP — Master clear reset / programming voltage |
| Chân 44 | VDD — Positive supply |
Ứng dụng tiêu biểu
PIC18LF452-I/L phù hợp cho 6 Áp dụngs: Industrial Motor Control, HVAC Blower and Actuator Control, Sensor Conditioning Front-End, Automotive Body Electronics (Non-Safety), Security and Alarm Panels, General Embedded Control Board.
Industrial Motor Control
The PIC18LF452-I/L drives brushed DC, stepper, and BLDC motors via its ECCP module generating complementary PWM with dead-band control, paired with the 10-bit ADC for current/voltage feedback. At 10 MIPS and 100 ns instruction cycle, it can execute a 4 kHz to 20 kHz torque-control loop with margin for UART diagnostics. The 2.0 V to 5.5 V supply simplifies designs using a single 24V-to-5V or 24V-to-3.3V buck.
Được đề xuất
HVAC Blower and Actuator Control
In HVAC systems, the PIC18LF452-I/L serves as a low-cost controller for blower fan speed, damper position, and actuator sequencing. Its 2.0 V to 5.5 V input range accepts 24V-to-5V derived rails commonly found in furnace and air-handler control boards. The 34 I/O pins interface directly to TRIAC drivers, optocouplers, and temperature sensors, while the USART enables connection to building-automation controllers.
Được đề xuất
Sensor Conditioning Front-End
The PIC18LF452-I/L handles analog sensor arrays using its 10-bit 8-channel ADC (up to 33 ksps at 5 V) and two analog comparators. Common use cases include strain-gauge bridges, thermistor linearization, and 4 mA to 20 mA loop readout. The 1536-byte RAM holds moving-average and digital-filter coefficients, while the 32 KB Flash stores calibration tables - sufficient for industrial instrumentation nodes.
Được đề xuất
Automotive Body Electronics (Non-Safety)
For non-safety automotive subsystems such as seat controllers, mirror adjusters, and lighting nodes, the PIC18LF452-I/L's industrial temperature grade (-40 C to +85 C) provides adequate margin under-dash thermal stress. The 5 V-tolerant I/O and 40 MHz operation support LIN or CAN-style UART comms via external transceivers. The PLCC socket form factor eases field service for dealer-network warranty replacements.
Được đề xuất
Security and Alarm Panels
The PIC18LF452-I/L is widely used in legacy security panels for zone-input monitoring (via 10-bit ADC or comparator), keypad scanning (using multiple I/O), and siren/strobe activation. The 32 KB Flash supports proprietary protocol stacks for central-station communication over the integrated USART. Its nanoWatt sleep modes extend battery life in wireless PIR or door-sensor nodes.
Được đề xuất
General Embedded Control Board
The PIC18LF452-I/L anchors thousands of legacy and educational embedded designs, including hobby robotics, custom instruments, and university labs. The PLCC socket form factor supports insertion/removal without desoldering - critical for classroom training and rapid prototyping. With MPLAB X IDE, ICD debugging, and Microchip's XC8 compiler, the part retains an active ecosystem of tools, libraries, and application notes.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF452-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 | PIC18LF452-E/L | PIC18F452-I/L | PIC18F452T-I/L | PIC18F452T-E/L |
|---|---|---|---|---|---|
| Package | 44-pin PLCC | 44-pin PLCC - same | 44-pin PLCC - same | 44-pin PLCC - same | 44-pin PLCC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash (KB) | 32 | 32 | 32 | 32 | 32 |
| RAM (bytes) | 1536 | 1536 | 1536 | 1536 | 1536 |
| EEPROM (bytes) | 256 | 256 | 256 | 256 | 256 |
| Operating Voltage (V) | 2.0 to 5.5 | 2.0 to 5.5 | 4.2 to 5.5 | 4.2 to 5.5 | 4.2 to 5.5 |
| Max Clock (MHz) | 40 | 40 | 40 | 40 | 40 |
| Temperature Grade | Industrial -40 C to +85 C | Extended -40 C to +125 C | Industrial -40 C to +85 C | Industrial -40 C to +85 C | Extended -40 C to +125 C |
Bảo phân biệt quan trọng
- Extended low-voltage (LF) supply range 2.0 V to 5.5 V (vsPIC18F452-I/L)
- Industrial temperature grade -40 C to +85 C in the same footprint (vsPIC18LF452-E/L)
- 44-pin PLCC socket compatibility for field-replaceable designs (vsPIC18LF4520-I/PT)
Ghi chú thiết kế
Estimated: at 40 MHz with all peripherals enabled and 5 V VDD, the PIC18LF452-I/L core draws roughly 15-20 mA plus I/O current. For each VDD/VSS pin pair (pins 17, 26, 39, 44), place a 0.1 uF ceramic decoupling capacitor within 5 mm of the pin. Add a single 10 uF bulk capacitor near the package. For low-voltage 2.5V/3.3V rails, retain the same decoupling topology; the LF variant is fully functional below 4.2 V.
The 44-pin PLCC socket (e.g., 3M Textool or AMP) accepts pin-header inserts. Route the ICSP/ICD signals (PGC/PGD on RB6/RB7, MCLR on pin 43) to a dedicated 5-pin header with no series resistors; add a 10 kohm pull-up on MCLR. Place the resonator within 1 cm of OSC1/OSC2 (pins 37/38) and guard with a ground ring. For PLCC sockets, ensure the socket has a low-profile retention clip to avoid vibration-induced contact loss in industrial environments.
Do not confuse the PIC18LF452 (2.0 V to 5.5 V) with the PIC18F452 (4.2 V to 5.5 V) when designing for 3.3 V rails - the F variant will fail to start below 4.2 V. Always set the CONFIG3L LVP bit appropriately; the fresh device has LVP enabled and will use RB5/PGM as the programming pin. In-circuit debugger (ICD) connection requires ALL VSS pins (8, 17, 26) and ALL VDD pins (39, 44) to be present - missing one will cause programming failure.
For 10-bit ADC accuracy above 8 ENOB, source-impedance should stay below 5 kohm and the ADC acquisition time must be configured for the actual MUX channel impedance (TACQ = 2TAD + TCSS + TCOEF*(CHOLD)(RIC + RSS + RS)). Use the AVSS pin (30) and route the analog ground as a separate trace back to the power entry point. If using VREF+/VREF-, place a 0.1 uF + 10 uF buffer at the AVDD/VREF rail to absorb ADC current transients.
Thông tin tuân thủ
RoHS and lead-free confirmed per Microchip product page and distributor listings. Not AEC-Q100 qualified; use PIC18LF452-E/L (extended temp) or AEC-Q100-specific PIC18 variants for automotive safety.
