PIC18LF45K40T-I/PT - 8-bit 64MHz XLP MCU 32KB Flash | Microchip
MPN： PIC18LF45K40T-I/PT ✓ 啟用中PIC18LF45K40T-I/PT 概覽
An 8-bit microcontroller (MCU) is a small computer-on-a-chip built around an 8-bit data path and is widely used in cost-sensitive, deterministic embedded applications such as sensor nodes, consumer appliances, motor control and industrial automation. The PIC18 family sits in Microchip's mid-range 8-bit portfolio, between the baseline PIC10/12/16 families and the dsPIC/PIC24 16-bit families, and is part of the broader microcontroller category under digital logic ICs. The 'LF' suffix designates the low-power (1.8-3.6 V) variant, while 'XLP' (eXtreme Low Power) refers to Microchip's low-power peripheral design that enables nanoWatt sleep currents suitable for battery-powered designs.
Key features include nanoWatt XLP technology for deep sleep current in the nanoamp range, Core Independent Peripherals (CIPs) such as CWG, WWDT and CRC/SCAN that offload tasks from the CPU, and Peripheral Pin Select (PPS) for flexible signal routing. The device also includes multiple power-managed operating modes (IDLE/DOZE/PMD) and hardware limit timer (HLT) for safety-critical or fault-detecting applications.
Typical applications include low-power IoT sensor nodes, battery-powered instrumentation, home appliances, motor control with CCP/PWM, and industrial control panels with LIN/EUSART connectivity. The wide 1.8-3.6 V supply range and integrated analog make it well suited for sensor conditioning and closed-loop feedback systems.
This page synthesizes distributor pricing, drop-in PIC18 family alternatives and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 PIC18LF45K40T-I/PT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC18LF45K40T-I/PT （相同外形與佔位） — 差異在於 ADC, Package, Operating Temperature, Core, DAC.
PIC18LF45K40-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18F45K40T-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF45K40-E/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18F46K40T-I/PT
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC18LF46K40T-I/PT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PIC18LF45K40T-I/PT 最大額定值與電氣特性
| Core | PIC18 8-bit |
| Series | PIC XLP 18K |
| Core Size | 8-bit |
| Maximum CPU Frequency | 64 MHz |
| Program Memory (Flash) | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 256 B |
| Supply Voltage (Vcc/Vdd) | 1.8 V to 3.6 V |
| I/O Pins | 36 |
| ADC | 10-bit ADC2 (multiple) |
| DAC | 5-bit |
| 封裝 / 外殼 | 44-TQFP (10x10 mm) |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40C to +85C (Industrial) |
| Connectivity | EUSART, SPI, I2C |
| Peripherals | Brown-out Detect, PWM, CCP, CWG, HLT, WWDT, SCAN/CRC, ZCD, PPS, IDLE/DOZE/PMD |
| RoHS 狀態 | Compliant |
PIC18LF45K40T-I/PT 腳位配置
| 腳位 1 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| 腳位 2 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| 腳位 3 | RA2/AN2 — Digital I/O / Analog input channel 2 |
| 腳位 4 | RA3/AN3 — Digital I/O / Analog input channel 3 |
| 腳位 5 | RA4/AN4 — Digital I/O / Analog input channel 4 |
| 腳位 6 | RA5/AN5 — Digital I/O / Analog input channel 5 |
| 腳位 7 | RA6/OSC2 — Digital I/O / Oscillator output |
| 腳位 8 | RA7/OSC1 — Digital I/O / Oscillator input |
| 腳位 9 | VSS — Ground reference |
| 腳位 10 | VDD — Positive supply voltage |
| 腳位 11 | RB0/AN12 — Digital I/O / Analog input channel 12 |
| 腳位 12 | RB1/AN10 — Digital I/O / Analog input channel 10 |
| 腳位 13 | RB2/AN8 — Digital I/O / Analog input channel 8 |
| 腳位 14 | RB3/AN9 — Digital I/O / Analog input channel 9 |
| 腳位 15 | RB4/AN11 — Digital I/O / Analog input channel 11 |
| 腳位 16 | RB5/AN13 — Digital I/O / Analog input channel 13 |
| 腳位 17 | RB6/ICSPCLK — Digital I/O / In-Circuit Serial Programming clock |
| 腳位 18 | RB7/ICSPDAT — Digital I/O / In-Circuit Serial Programming data |
| 腳位 19 | VSS — Ground reference |
| 腳位 20 | VDD — Positive supply voltage |
| 腳位 21 | RC0/SOSCO — Digital I/O / Secondary oscillator output |
| 腳位 22 | RC1/SOSCI — Digital I/O / Secondary oscillator input |
| 腳位 23 | RC2 — Digital I/O |
| 腳位 24 | RC3 — Digital I/O |
| 腳位 25 | RC4 — Digital I/O |
| 腳位 26 | RC5 — Digital I/O |
| 腳位 27 | RC6 — Digital I/O |
| 腳位 28 | RC7 — Digital I/O |
| 腳位 29 | VSS — Ground reference |
| 腳位 30 | VDD — Positive supply voltage |
| 腳位 31 | RD0 — Digital I/O |
| 腳位 32 | RD1 — Digital I/O |
| 腳位 33 | RD2 — Digital I/O |
| 腳位 34 | RD3 — Digital I/O |
| 腳位 35 | RD4 — Digital I/O |
| 腳位 36 | RD5 — Digital I/O |
| 腳位 37 | RD6 — Digital I/O |
| 腳位 38 | RD7 — Digital I/O |
| 腳位 39 | VSS — Ground reference |
| 腳位 40 | VDD — Positive supply voltage |
| 腳位 41 | RE0 — Digital I/O |
| 腳位 42 | RE1 — Digital I/O |
| 腳位 43 | RE2 — Digital I/O |
| 腳位 44 | RE3 — Digital I/O |
典型應用
PIC18LF45K40T-I/PT 適用於 6 應用s: Battery-Powered IoT Sensor Nodes, Home Appliance Control Boards, Industrial Control Panels and HMI, Automotive Body and Lighting Modules (non-safety), Portable Medical Monitoring Devices, Motor Control and Small BLDC Drivers.
Battery-Powered IoT Sensor Nodes
The PIC18LF45K40T-I/PT suits battery-powered IoT sensor nodes because its nanoWatt XLP technology delivers sleep currents in the nanoamp range, while the 1.8-3.6 V LF supply range allows direct operation from a single Li-ion or 2x AA cell stack without a boost converter. The integrated 10-bit ADC2 with Computation handles sensor conditioning in hardware, freeing the 64 MHz CPU from polling loops. The IDLE/DOZE/PMD power-managed modes let the MCU wake on interrupt, sample, transmit on EUSART/SPI/I2C, and return to sleep, maximizing battery life across years of service intervals.
推薦
Home Appliance Control Boards
The PIC18LF45K40T-I/PT fits home appliance control boards where its 44-TQFP footprint integrates with washing machine, dishwasher and microwave user interfaces. The 32 KB Flash accommodates state-machine control firmware, the 5-bit DAC and PWM peripherals drive buzzer and triac-style loads, and the 10-bit ADC2 reads temperature sensors and water-level probes. The hardware limit timer (HLT) and windowed watchdog (WWDT) provide functional safety primitives, and PPS allows flexible PCB routing when GPIO assignments change between product variants.
推薦
Industrial Control Panels and HMI
Industrial control panels and HMI terminals use the PIC18LF45K40T-I/PT for its 36 I/O pins, 64 MHz throughput and integrated peripherals. The EUSART links to RS-485 transceivers for Modbus RTU, while SPI drives TFT displays and I2C reads EEPROM or RTC chips. CWG (Complementary Waveform Generator) with ZCD (Zero-Cross Detect) enables dimmer and motor-control drive stages. The SCAN/CRC peripherals implement periodic memory scans and CRC integrity checks, which are valuable for IEC 61508 safety-conscious designs.
推薦
Automotive Body and Lighting Modules (non-safety)
For non-safety automotive body and lighting modules such as interior lighting controllers, RGB drivers and body computers, the PIC18LF45K40T-I/PT provides PWM channels for LED dimming, EUSART for LIN-bus connectivity, and 32 KB Flash for application firmware. Note: the -I/PT suffix is industrial grade (-40C to +85C), so for AEC-Q100 qualified automotive designs use the -VAO or -EP variants of the PIC18(L)F45K40 family. The PPS flexibility eases PCB layout under tight automotive EMC constraints.
推薦
Portable Medical Monitoring Devices
Portable medical monitoring devices such as pulse oximeters, thermometers and handheld diagnostic probes benefit from the PIC18LF45K40T-I/PT's XLP nanoWatt sleep, 10-bit ADC2 and EUSART/SPI connectivity for wireless modules. The 64 MHz CPU delivers enough throughput for filtering and display refresh, while the 2 KB SRAM supports small sensor data buffers. Although this part is not medical-grade certified, designers can pair it with a separate analog front end for clinical applications.
推薦
Motor Control and Small BLDC Drivers
Small BLDC and brushed-DC motor controllers use the PIC18LF45K40T-I/PT for its PWM, CCP and CWG peripherals that generate complementary drive waveforms with dead-band control. The 64 MHz instruction rate is sufficient for sensorless commutation algorithms using BEMF via the comparator and ZCD, while the 5-bit DAC provides reference voltages to gate drivers. The 32 KB Flash and 2 KB SRAM accommodate state-machine plus PI-control code, and PPS allows flexible pin assignments when the layout changes between motor variants.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18LF45K40T-I/PT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC18LF45K40-I/PT | PIC18F45K40T-I/PT | PIC18LF45K40-E/PT | PIC18F46K40T-I/PT | PIC18LF46K40T-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same |
| Core | PIC18 8-bit, 64 MHz | PIC18 8-bit, 64 MHz - same | PIC18 8-bit, 64 MHz - same | PIC18 8-bit, 64 MHz - same | PIC18 8-bit, 64 MHz - same | PIC18 8-bit, 64 MHz - same |
| Supply Voltage | 1.8 V to 3.6 V (LF) | 1.8 V to 3.6 V (LF) - same | 2.3 V to 5.5 V (F) | 1.8 V to 3.6 V (LF) - same | 2.3 V to 5.5 V (F) | 1.8 V to 3.6 V (LF) |
| Flash | 32 KB | 32 KB - same | 32 KB - same | 32 KB - same | 64 KB (larger) | 64 KB (larger) |
| SRAM | 2 KB | 2 KB - same | 2 KB - same | 2 KB - same | 3 KB (larger) | 3 KB (larger) |
| EEPROM | 256 B | 256 B - same | 256 B - same | 256 B - same | 1 KB (larger) | 1 KB (larger) |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C - same | Industrial -40C to +85C - same | Extended -40C to +125C | Industrial -40C to +85C | Industrial -40C to +85C |
| Packaging Format | Tape & Reel | Tray | Tape & Reel - same | Tray | Tape & Reel - same | Tape & Reel - same |
主要差異化特點
- Only 32 KB Flash 44-TQFP LF variant with T/R packaging (對比PIC18LF45K40-I/PT)
- Lower 1.8 V minimum supply supports deeper battery discharge (對比PIC18F45K40T-I/PT)
- Industrial temperature grade with T/R packaging for SMT (對比PIC18LF45K40-E/PT)
- Smaller 32 KB Flash fits cost-sensitive designs (對比PIC18LF46K40T-I/PT)
設計說明
The PIC18LF45K40T-I/PT supports multiple VDD pins (10, 20, 30, 40) that each require a 100 nF decoupling capacitor placed within 5 mm of the pin. A bulk 1 uF to 10 uF capacitor on the main VDD rail suppresses transient load spikes during ADC sampling and EUSART transmission. Tie all VSS pins (9, 19, 29, 39) to a low-impedance ground plane with multiple vias to avoid ground bounce that could disturb ADC2 readings.
The 44-pin TQFP has a 0.8 mm pitch. Use 0.4 mm wide traces between pads and ensure the land pattern matches the IPC-7351 nominal TQFP-44 recommendation. Place the ICSP pins RB6/ICSPCLK (pin 17) and RB7/ICSPDAT (pin 18) on a 0.1 inch grid if possible to simplify programming header placement. The exposed pad is not present on this TQFP-44 package, simplifying PCB layout versus the QFN-44 variant.
Configure unused I/O pins as digital outputs with low-level state or as inputs with the internal weak pull-up enabled, not as floating inputs - floating pins draw transient current and can inject noise into ADC2 channels. Always clear the FWDTEN fuse if you intend to disable the WDT in software, and remember that the PPS unlock sequence (PPSLOCK = 0x55, 0xAA) must be followed before any peripheral pin remap takes effect. For low-power designs, configure all unused peripherals via PMD (Peripheral Module Disable) registers to minimize active current.
Keep the analog inputs AN0-AN13 (pins 1-8, 11-16) on a separate analog ground island if possible, joined to the digital ground at a single point near the VDD bulk capacitor. The 10-bit ADC2 with Computation benefits from a quiet reference - use a dedicated low-noise LDO such as MCP1700 to power VDD+ if ADC accuracy better than 8 ENOB is required. Place the HFINTOSC decoupling capacitor within 3 mm of the OSC1/OSC2 pins when using an external crystal.
合規資訊
RoHS and REACH compliant per DigiKey/Mouser product page listings. Not AEC-Q100 qualified - the -I/PT is industrial grade (-40C to +85C). For AEC-Q100 qualified automotive variants, look for the -VAO or -EP suffix versions of the PIC18(L)F45K40 family.