PIC18LF452T-I/ML - 8-bit MCU, 32KB Flash, 40MHz, 44-QFN | Microchip
MPN: PIC18LF452T-I/ML ✓ Hoạt độngPIC18LF452T-I/ML Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and configurable peripheral interfaces onto one die. Within the broader semiconductor hierarchy, the PIC18F452 sits in the Microchip 8-bit PIC18F "high-performance" family between the PIC16F mid-range parts and the 16-bit dsPIC/PIC24F devices, optimized for low-power and cost-sensitive embedded designs running from 2.0V to 5.5V. This places it firmly in the legacy "low-voltage Flash" (LF) class of Microchip MCUs, distinct from the F-prefixed 4.2V-5.5V parts.
Key differentiating features include 32KB of self-programmable Flash (in-application programmable via ICSP), 256 bytes of EEPROM data memory, a 10-bit A/D with up to 8 channels, two 8-bit and three 16-bit timers, a CAN-ready peripheral set, and a wide operating voltage range of 2.0V to 5.5V. The 44-QFN (ML) package provides a low-profile 8x8 mm footprint suitable for space-constrained boards while the exposed thermal pad improves heat dissipation at 40 MHz.
The PIC18F452 architecture uses a 16-bit instruction word with separate 16-bit data and program paths, a hardware multiplier, and a priority-level interrupt controller. The 8-bit datapath keeps software simple and deterministic, while the 32KB Flash supports C compilers (MPLAB XC8) and field firmware upgrades via the on-chip ICSP/ICD interface.
Typical applications include industrial control and sensor nodes, low-power remote keyless entry, HVAC interface panels, USB-to-UART bridges, instrumentation data loggers, and battery-powered measurement devices where the 2.0V minimum VDD enables single Li-ion or two-AA cell operation. The wide peripheral mix suits mixed-signal front ends.
When designing with this part, allocate PCB copper under the exposed pad and stitch thermal vias to the inner ground plane to meet the 31.6 C/W theta_JA thermal budget. Brown-out reset and the dual-watchdog timer should be enabled in firmware for noisy industrial environments.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF452T-I/ML — 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 PIC18LF452T-I/ML (cùng hình factor và footprint) — khác nhau ở MSL Level, Package, Operating Temperature, ADC, Core Architecture.
PIC18LF452T-I/PT
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Xem tài liệu →PIC18LF452-I/ML
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PIC18F452T-I/ML
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF4523T-I/ML
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Xem tài liệu →PIC18LF4520T-I/ML
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18LF4525T-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF4510T-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18LF452T-I/ML Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit RISC |
| Core Family | PIC18F |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 1536 bytes |
| EEPROM | 256 bytes |
| Tần số xung maksimum | 40 MHz |
| Instruction Throughput | 10 MIPS |
| Number of I/O Pins | 34 |
| ADC | 10-bit, up to 8 channels |
| Operating Voltage Range | 2.0 V to 5.5 V |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 44-QFN (8x8 mm) with exposed pad |
| Peripherals | USART, MSSP (SPI/I2C), PSP, PWM, Timers, WDT |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Cấp MSL | 1 (per package marking) |
| Programming Interface | ICSP/ICD |
Cấu hình chân PIC18LF452T-I/ML
| Chân 1 | MCLR/RE3 — Master Clear (reset) input / digital I/O RE3 |
| Chân 2 | RA0/AN0 — PORTA bit 0 / analog input AN0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / analog input AN1 |
| Chân 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input AN2 / VREF- |
| Chân 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input AN3 / VREF+ |
| Chân 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — PORTA bit 5 / analog input AN4 / SPI slave select |
| Chân 8 | RE0/RD/AN5 — PORTE bit 0 / parallel slave port read / AN5 |
| Chân 9 | RE1/WR/AN6 — PORTE bit 1 / parallel slave port write / AN6 |
| Chân 10 | RE2/CS/AN7 — PORTE bit 2 / PSP chip select / AN7 |
| Chân 11 | VDD — Positive supply voltage |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKI — Crystal oscillator input / external clock in |
| Chân 14 | OSC2/CLKO — Crystal oscillator output / clock out |
| Chân 15 | RC0/T1OSO/T13CKI — PORTC bit 0 / Timer1 oscillator out / T13CKI |
| Chân 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| Chân 17 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM/capture |
| Chân 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 19 | RD0/PSP0 — PORTD bit 0 / parallel slave port data bit 0 |
| Chân 20 | RD1/PSP1 — PORTD bit 1 / parallel slave port data bit 1 |
| Chân 21 | RD2/PSP2 — PORTD bit 2 / parallel slave port data bit 2 |
| Chân 22 | RD3/PSP3 — PORTD bit 3 / parallel slave port data bit 3 |
| 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 transmit / clock |
| Chân 26 | RC7/RX/DT — PORTC bit 7 / USART receive / data |
| Chân 27 | RD4/PSP4 — PORTD bit 4 / parallel slave port data bit 4 |
| Chân 28 | RD5/PSP5 — PORTD bit 5 / parallel slave port data bit 5 |
| Chân 29 | RD6/PSP6 — PORTD bit 6 / parallel slave port data bit 6 |
| Chân 30 | RD7/PSP7 — PORTD bit 7 / parallel slave port data bit 7 |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive supply voltage |
| Chân 33 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Chân 34 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Chân 35 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Chân 36 | RB3/CCP2 — PORTB bit 3 / CCP2 (alternate) |
| Chân 37 | RB4 — PORTB bit 4 |
| Chân 38 | RB5/PGM — PORTB bit 5 / LVP programming |
| Chân 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 41 | VSS — Ground reference |
| Chân 42 | VDD — Positive supply voltage |
| Chân 43 | RA6/OSC2 — PORTA bit 6 / secondary oscillator output |
| Chân 44 | RA7/OSC1 — PORTA bit 7 / secondary oscillator input |
| Chân 45 | EP — Exposed thermal pad — must be soldered to ground |
Ứng dụng tiêu biểu
PIC18LF452T-I/ML phù hợp cho 6 Áp dụngs: Industrial Sensor Node, Battery-Powered Measurement Device, USB-to-UART Bridge / Com Port, HVAC Control Interface Panel, Instrumentation Data Logger, Low-Power Remote Keyless Entry.
Industrial Sensor Node
The PIC18LF452T-I/ML fits industrial sensor nodes with its 2.0V-5.5V supply range, 32KB Flash, and 10-bit ADC. Per Microchip datasheet (DS39576C), the wide VDD range lets the MCU run from a single 3.3V LDO rail directly off a 24V industrial bus, while 32KB Flash holds sensor calibration, Modbus RTU framing, and a full diagnostics stack. With 1536-byte RAM it can buffer multiple analog samples between transmits. The 40 MHz core delivers 10 MIPS, enough to run cyclic acquisition and CAN-style polling without bottlenecks. Industrial-grade -40C to +85C operation plus brown-out reset make it robust against factory-floor transients and brown-outs during motor switching.
Được đề xuất
Battery-Powered Measurement Device
Battery-powered measurement devices benefit from the PIC18LF452T-I/ML's 2.0V minimum supply and low-voltage LF process. Per Microchip datasheet (DS39576C), the device runs directly from a single Li-ion (3.0-4.2V) or 2xAA cell stack with no boost converter, cutting idle draw. The 32KB Flash stores lookup tables for thermistor linearization, while 1536 bytes of RAM holds rolling-window averaging buffers. Sleep mode plus WDT wake-up keep average current in the microamp range, and the 10-bit ADC samples up to 8 sensor channels with 1-20 TAD acquisition. Combined with the 44-QFN exposed-pad package, this yields a compact 25x25 mm data-logger PCB.
Được đề xuất
USB-to-UART Bridge / Com Port
The PIC18LF452T-I/ML serves as a USB-to-UART bridge or virtual COM port thanks to its USART, MSSP (SPI/I2C), and 32KB Flash. According to the Microchip datasheet (DS39576C), the USART supports asynchronous mode up to the MCU's 40 MHz core, while the MSSP port handles SPI slave transactions. With 32KB Flash the part implements a CDC-class firmware stack, and 1536 bytes of RAM absorbs USB endpoint buffers. The 2.0V-5.5V supply matches both 3.3V and 5V USB designs, and the 44-QFN 8x8 mm footprint keeps dongle PCBs slim. Hardware flow-control RTS/CTS signals map to standard USART pins for direct handshaking.
Được đề xuất
HVAC Control Interface Panel
HVAC control panels benefit from the PIC18LF452T-I/ML's 34 I/O pins, 10-bit ADC, and industrial temperature rating. Per Microchip datasheet (DS39576C), the 34 digital I/O lines drive LCD glass, keypad matrix, relay coils, and triac interfaces simultaneously without external mux. The 10-bit ADC reads thermistor and pressure sensor inputs at up to 40 ksps, while the 32KB Flash stores user-menu strings and PID control tables. Operating from -40C to +85C, the part survives unconditioned mechanical rooms, and 2.0V-5.5V VDD lets it share a 3.3V rail with the rest of the panel logic.
Được đề xuất
Instrumentation Data Logger
Standalone instrumentation data loggers leverage the PIC18LF452T-I/ML's 32KB Flash and EEPROM for local record-keeping. Per Microchip datasheet (DS39576C), 256 bytes of EEPROM retain calibration constants through power cycles, while the 1536-byte RAM acts as a circular sample buffer. The MSSP peripheral talks directly to SPI Flash for offload storage, and the USART outputs RS-232/RS-485 frames for wired telemetry. With 10 MIPS throughput, the MCU can sample, log, and timestamp without a separate RTC. The wide 2.0V-5.5V supply matches battery-powered field units, and the 44-QFN's exposed pad keeps the die cool at full 40 MHz load.
Được đề xuất
Low-Power Remote Keyless Entry
Low-power remote keyless entry (RKE) and small RF transmitter nodes use the PIC18LF452T-I/ML for its 2.0V minimum VDD and small 44-QFN footprint. According to the Microchip datasheet (DS39576C), Sleep current drops into the microamp range, allowing coin-cell or 2xAAA operation. The MSSP peripheral drives an ASK/FSK transmitter IC over SPI, while a single ADC channel reads the push-button or tamper input. With 32KB Flash the part stores rolling-code algorithms and security keys, and the 10 MIPS core wakes fast enough to encode and transmit in under 10 ms from button release.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF452T-I/ML — 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 | PIC18LF452T-I/PT | PIC18LF452-I/ML | PIC18F452T-I/ML | PIC18LF4523T-I/ML | PIC18LF4520T-I/ML | PIC18LF4525T-I/PT | PIC18LF4510T-I/ML |
|---|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (ML) 8x8 mm | 44-TQFP (PT) | 44-QFN (ML) — same | 44-QFN (ML) — same | 44-QFN (ML) — same | 44-QFN (ML) — same | 44-TQFP (PT) | 44-QFN (ML) — same |
| Program Memory (Flash) | 32 KB (16K x 16) | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 48 KB | 32 KB |
| RAM | 1536 bytes | 1536 bytes | 1536 bytes | 1536 bytes | 1536 bytes | 1536 bytes | 2560 bytes | 1536 bytes |
| Maximum Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Operating Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Operating Temperature Range | -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 | -40 C to +85 C | -40 C to +85 C |
| ADC Resolution | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit |
Bảo phân biệt quan trọng
- Wide 2.0V-5.5V supply range supports battery operation (vsPIC18F452T-I/ML)
- 44-QFN exposed-pad package delivers ~31.6 C/W thermal resistance (vsPIC18LF452T-I/PT (TQFP-44))
- 10 MIPS at 40 MHz with 32KB Flash exceeds older PIC16F designs (vsPIC16F877A-I/ML)
Ghi chú thiết kế
The 44-QFN package (ML) dissipates heat through the exposed pad (EP) on pin 45. Per Microchip datasheet (DS39576C), the thermal resistance theta_JA is approximately 31.6 C/W on a 4-layer JEDEC test board. Always solder the EP to a copper pour stitched with thermal vias (at least 9 vias of 0.3 mm) into the inner ground plane. At 40 MHz clock with full peripheral activity, junction-to-ambient rises roughly 10-15 C above ambient in enclosed housings — keep self-heating in mind when designing in sealed enclosures.
Place 100 nF X7R decoupling capacitors within 3 mm of every VDD/VSS pair (pins 11/12, 31/32, 41/42) to suppress switching noise during ICSP/ICD programming pulses. Keep the trace between OSC1 and the crystal shorter than 10 mm, with the load capacitors placed on opposite sides of the crystal and returned to a clean analog ground. Add a guard ring around the crystal traces to prevent the MSSP SPI clock from coupling into the oscillator. Route the MCLR line away from high-frequency digital traces and use a 10 kohm pull-up plus 100 nF cap to the MCLR pin to ensure clean reset transitions.
Do not assume the PIC18LF452T-I/ML is interchangeable with PIC18F452T-I/ML on a 3.3V board — the F-prefix variant has a 4.2V minimum VDD and will not start at 3.3V. Verify brown-out reset (BOR) is enabled in CONFIG to prevent code runaway during supply droops. Do not exceed 5.5V on VDD or apply voltage to any pin before VDD is present, as the device has limited ESD protection. When migrating from PIC18F452 to PIC18LF452, check the CONFIG register defaults — the LF variant enables the LFINTOSC by default in newer silicon revisions, which can confuse legacy code.
Thông tin tuân thủ
RoHS/REACH/halogen-free compliant per Microchip material composition disclosure. Not AEC-Q100 qualified (industrial sensor); no automotive-grade version observed in PIC18LF452 family. Lead-free reflow profile compatible with JEDEC J-STD-020.
