PIC18LF66K40-I/PT - 64KB Flash 8-Bit XLP MCU 64-TQFP | Microchip
MPN： PIC18LF66K40-I/PT ✓ 啟用中PIC18LF66K40-I/PT 概覽
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (Flash, EEPROM, SRAM), peripherals, and I/O into one IC. Within that hierarchy, the PIC18LF66K40 belongs to the 8-bit MCU class (PIC18 core with modified Harvard architecture), then to the PIC18 K40 sub-family (low-power XLP family), and finally to the PIC18LF66K40 product line. This taxonomy matters for engineers selecting pin-compatible successors and for distributors organizing inventory. The 'LF' prefix indicates the low-voltage F-variant (1.8V-3.6V core); the 'F' (no L) variant PIC18F66K40 runs up to 5.5V.
Key features include 64KB Flash (32K x 16 words), 3.5KB RAM, integrated ECAN, multiple EUSART/I2C/SPI interfaces, 44 channels of 10-bit ADC, a 5-bit DAC, Core Independent Peripherals such as CWG and WWDT, and CRC/Memory scan. The I-grade operating temperature is -40C to +85C. The TQFP-64 (PT) package provides 54 usable I/O pins after power and ground allocation, suitable for mixed-signal designs that need both analog input density and digital connectivity.
The PIC18LF66K40 architecture uses Microchip's enhanced mid-range 8-bit core with a hardware multiplier, 16-bit instruction path, and C-optimized instruction set. The internal 64 MHz oscillator, 4x PLL, and instruction-cycle timing of 4 clocks give effective 16 MIPS throughput, adequate for sensor fusion, motor control loops, and protocol bridging. The XLP sleep modes draw nanoamp-class currents, enabling years of operation from a single coin cell in duty-cycled applications.
Typical applications include low-power IoT sensor nodes, industrial control with ECAN-based fieldbus nodes, USB-CAN bridges, automotive body controllers (non-safety subsystems), home automation, smart metering, battery-powered medical monitors, and capacitive-touch user interfaces using the mTouch peripheral. Designers favor this MCU when low sleep current and 5V-tolerant I/O are both required.
When designing with this device, allocate decoupling capacitors on every VDD/VSS pair, route the ECAN signals as a differential pair with 120 ohm termination, and verify that the chosen XLP sleep mode meets wake-up latency constraints. The internal 32 kHz oscillator (LFINTOSC) or Timer1 clock source should be selected before relying on RTC-like functionality.
This page synthesizes the manufacturer datasheet specification set, current distributor stock and price tiers, drop-in package-compatible alternatives, and practical design notes that are not consolidated on a single manufacturer or distributor page.
直接替換替代品，適用於 PIC18LF66K40-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： PIC18LF66K40-I/PT （相同外形與佔位） — 差異在於 Package, Program Memory (Flash), Core Architecture, I/O Pins, ADC.
PIC18F66K40-I/PT
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18LF66K40-E/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF66K40-H/PT
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18F65K40-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF65K40-I/PT
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18F46K40-I/PT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PIC18F67K40-I/PT
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC18LF66K40-I/PT 最大額定值與電氣特性
| Core | PIC18 8-bit (modified Harvard) |
| CPU Speed | 64 MHz (16 MIPS when Fosc = 64 MHz, 4 clocks per instruction) |
| Program Flash | 64 KB (32K x 16 words) |
| Data RAM | 3.5 KB |
| Operating Voltage Range | 1.8 V to 5.5 V (LF core down to 1.8 V) |
| 工作溫度範圍 | -40 C to +85 C (I grade) |
| 封裝 | 64-pin TQFP (PT), 10 x 10 x 1 mm body |
| 安裝類型 | Surface Mount |
| I/O Pins | 54 (after power/ground allocation per datasheet) |
| ADC | 10-bit, up to 44 channels |
| DAC | 5-bit, 2 channels |
| Communication Interfaces | ECAN, 2x EUSART, 2x I2C/SMBus, 2x SPI |
| Timers | 8/16-bit timers, Capture/Compare/PWM modules |
| Core Independent Peripherals | CWG, WWDT, CRC/Memory scan, Hardware Limit Timer |
| Low-Power Technology | eXtreme Low Power (XLP) with nanoWatt sleep modes |
| RoHS 狀態 | Compliant |
PIC18LF66K40-I/PT 腳位配置
| 腳位 1 | RA0 — PORTA digital I/O / analog input |
| 腳位 2 | RA1 — PORTA digital I/O / analog input |
| 腳位 3 | RA2 — PORTA digital I/O / analog input |
| 腳位 4 | RA3 — PORTA digital I/O / analog input |
| 腳位 5 | RA4 — PORTA digital I/O / analog input |
| 腳位 6 | RA5 — PORTA digital I/O / analog input |
| 腳位 7 | RA6 — PORTA digital I/O / analog input |
| 腳位 8 | RA7 — PORTA digital I/O / analog input |
| 腳位 9 | VSS — Ground reference |
| 腳位 10 | VDD — Positive supply voltage (1.8 V to 5.5 V) |
| 腳位 11 | RB0 — PORTB digital I/O / analog input / interrupt-on-change |
| 腳位 12 | RB1 — PORTB digital I/O / analog input / interrupt-on-change |
| 腳位 13 | RB2 — PORTB digital I/O / analog input / interrupt-on-change |
| 腳位 14 | RB3 — PORTB digital I/O / analog input / interrupt-on-change |
| 腳位 15 | RB4 — PORTB digital I/O / analog input / interrupt-on-change |
| 腳位 16 | RB5 — PORTB digital I/O / analog input / interrupt-on-change |
| 腳位 17 | RB6 — PORTB digital I/O / analog input / interrupt-on-change / ICSP clock |
| 腳位 18 | RB7 — PORTB digital I/O / analog input / interrupt-on-change / ICSP data |
| 腳位 19 | VSS — Ground reference |
| 腳位 20 | VDD — Positive supply voltage |
| 腳位 21 | RC0 — PORTC digital I/O / analog input |
| 腳位 22 | RC1 — PORTC digital I/O / analog input |
| 腳位 23 | RC2 — PORTC digital I/O / analog input |
| 腳位 24 | RC3 — PORTC digital I/O / analog input / SCL |
| 腳位 25 | RC4 — PORTC digital I/O / analog input / SDA |
| 腳位 26 | RC5 — PORTC digital I/O / analog input |
| 腳位 27 | RC6 — PORTC digital I/O / analog input / TX |
| 腳位 28 | RC7 — PORTC digital I/O / analog input / RX |
| 腳位 29 | VSS — Ground reference |
| 腳位 30 | VDD — Positive supply voltage |
| 腳位 31 | RD0 — PORTD digital I/O |
| 腳位 32 | RD1 — PORTD digital I/O |
| 腳位 33 | RD2 — PORTD digital I/O |
| 腳位 34 | RD3 — PORTD digital I/O |
| 腳位 35 | RD4 — PORTD digital I/O |
| 腳位 36 | RD5 — PORTD digital I/O |
| 腳位 37 | RD6 — PORTD digital I/O |
| 腳位 38 | RD7 — PORTD digital I/O |
| 腳位 39 | VSS — Ground reference |
| 腳位 40 | VDD — Positive supply voltage |
| 腳位 41 | RE0 — PORTE digital I/O |
| 腳位 42 | RE1 — PORTE digital I/O |
| 腳位 43 | RE2 — PORTE digital I/O |
| 腳位 44 | RE3 — PORTE digital I/O |
| 腳位 45 | RE4 — PORTE digital I/O |
| 腳位 46 | RE5 — PORTE digital I/O |
| 腳位 47 | RE6 — PORTE digital I/O |
| 腳位 48 | RE7 — PORTE digital I/O |
| 腳位 49 | VSS — Ground reference |
| 腳位 50 | VDD — Positive supply voltage |
| 腳位 51 | RF0 — PORTF digital I/O |
| 腳位 52 | RF1 — PORTF digital I/O |
| 腳位 53 | RF2 — PORTF digital I/O |
| 腳位 54 | RF3 — PORTF digital I/O |
| 腳位 55 | RF4 — PORTF digital I/O |
| 腳位 56 | RF5 — PORTF digital I/O |
| 腳位 57 | RF6 — PORTF digital I/O |
| 腳位 58 | RF7 — PORTF digital I/O |
| 腳位 59 | VSS — Ground reference |
| 腳位 60 | VDD — Positive supply voltage |
| 腳位 61 | RG0 — PORTG digital I/O |
| 腳位 62 | RG1 — PORTG digital I/O |
| 腳位 63 | RG2 — PORTG digital I/O |
| 腳位 64 | RG3 — PORTG digital I/O |
典型應用
PIC18LF66K40-I/PT 適用於 7 應用s: Low-Power IoT Sensor Nodes, Industrial ECAN Fieldbus Nodes, Automotive Body Controllers, Smart Energy Meters, Home Automation Hubs, Battery-Powered Medical Monitors, Capacitive Touch User Interfaces.
Low-Power IoT Sensor Nodes
The PIC18LF66K40-I/PT fits battery-powered IoT sensor nodes because of its XLP nanoWatt sleep modes with sub-1 uA standby current and 1.8 V to 5.5 V VDD range, enabling years of operation from a coin cell. The 64 KB Flash holds over-the-air (OTA) update images plus application code, while 3.5 KB RAM handles sensor buffers and stack frames for BLE/Zigbee companion MCUs. The 64-pin TQFP footprint exposes 54 I/O lines for multi-sensor acquisition boards (temperature, humidity, motion, gas). Wake-up via Real-Time Clock Calendar or external interrupt enables duty-cycled sampling at <1% duty, where the part spends >99% of its life in sleep mode.
推薦
Industrial ECAN Fieldbus Nodes
The PIC18LF66K40-I/PT is a strong fit for industrial ECAN nodes requiring CAN 2.0B compliance, integrated ECAN controller, and 64-pin TQFP I/O density for valve, motor, and sensor interfaces. The 64 MHz core (16 MIPS) handles 1 Mbps CAN throughput plus upper-layer protocol stacks (CANopen, DeviceNet, J1939) without CPU starvation. The 44-channel 10-bit ADC reads process variables (pressure, flow, temperature), and the 5-bit DAC provides analog setpoint outputs. The XLP sleep mode supports truck and battery-backed systems where quiescent current is regulated to under 1 uA.
推薦
Automotive Body Controllers
The PIC18LF66K40-I/PT is used in non-safety automotive body controller modules where cost-effective 8-bit processing, LIN/CAN networking, and high I/O count are needed for door, lighting, and HVAC control. The PIC18LF66K40-E/PT (extended temperature, same TQFP-64 footprint) is qualified for under-hood operation from -40 C to +125 C. With 54 I/O pins, the MCU directly drives LED matrix tail lamps, PWM fan controllers, and multiple LIN slave nodes via its EUSART peripherals. AEC-Q100 qualification is not available on this part; for safety-critical subsystems, Microchip recommends the PIC18F66K40 family with automotive-grade part numbers.
推薦
Smart Energy Meters
The PIC18LF66K40-I/PT enables smart electricity, gas, and water meters with its 44 ADC channels for multi-phase power measurement, 64 KB Flash for metrology firmware plus security libraries, and XLP sleep modes for battery-backed tamper detection. The integrated ECAN peripheral supports utility grid communication (DLMS/COSEM over CAN), and the 54 I/O pins handle metrology IC interfaces, LCD drivers, and tamper switches. The 1.8 V to 5.5 V operating range allows direct operation from battery or metrology IC rails without additional LDOs.
推薦
Home Automation Hubs
The PIC18LF66K40-I/PT fits home automation hubs and bridge devices that aggregate wireless sensors and translate between Zigbee, BLE, Wi-Fi, and wired protocols. Its dual EUSART interfaces bridge to two radios simultaneously, the two SPI peripherals drive RGB LED drivers or TFT displays, and the I2C bus manages sensors. The 64 KB Flash stores application logic plus RF protocol stacks, while the ECAN peripheral enables integration with whole-home energy management systems. XLP sleep modes ensure standby power below 0.5 W for always-on hubs.
推薦
Battery-Powered Medical Monitors
The PIC18LF66K40-I/PT supports portable medical monitoring devices (pulse oximeters, glucometers, INR meters, wearable event monitors) due to its XLP nanoWatt sleep modes, 1.8 V to 5.5 V operation, and 54 I/O pins for sensor matrix, display, and user input. The 44-channel 10-bit ADC digitizes biosensor waveforms, while the 5-bit DAC drives audio prompts or analog references. The 64 KB Flash accommodates sensor calibration libraries and BLE stack, and the 3.5 KB RAM buffers biosignal frames during display update. Note: this part is not FDA-cleared or IEC 60601 qualified; medical certification is the integrator's responsibility.
推薦
Capacitive Touch User Interfaces
The PIC18LF66K40-I/PT drives capacitive touch keypads and sliders through Microchip's mTouch peripheral (implemented via CVD-based ADC and dedicated hardware), supporting up to 44 touch channels without external components. The 64 MHz core runs the mTouch library and event handling with low latency, while the 64 KB Flash holds touch patterns plus UI state machine. The XLP sleep mode keeps quiescent current under 5 uA between touches, critical for battery-powered remote controls and IoT wall switches. The 54 I/O lines support both touch sensing and traditional keypad/LED matrix simultaneously.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18LF66K40-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 | PIC18F66K40-I/PT | PIC18LF66K40-E/PT | PIC18F65K40-I/PT | PIC18LF65K40-I/PT | PIC18F67K40-I/PT |
|---|---|---|---|---|---|---|
| Package | 64-pin TQFP (PT) 10x10 mm | 64-pin TQFP (PT) 10x10 mm - same | 64-pin TQFP (PT) 10x10 mm - same | 64-pin TQFP (PT) 10x10 mm - same | 64-pin TQFP (PT) 10x10 mm - same | 64-pin TQFP (PT) 10x10 mm - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit |
| CPU Speed | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) |
| Program Flash | 64 KB | 64 KB | 64 KB | 32 KB | 32 KB | 128 KB |
| Operating Voltage (VDD core) | 1.8 V to 3.6 V | 2.3 V to 5.5 V | 1.8 V to 3.6 V | 2.3 V to 5.5 V | 1.8 V to 3.6 V | 2.3 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (I grade) | -40 C to +85 C (I grade) | -40 C to +125 C (E grade) | -40 C to +85 C (I grade) | -40 C to +85 C (I grade) | -40 C to +85 C (I grade) |
| I/O Pins | 54 | 54 | 54 | 54 | 54 | 54 |
| ECAN | Yes | Yes | Yes | Yes | Yes | Yes |
| XLP / nanoWatt | Yes | Yes | Yes | Yes | Yes | Yes |
主要差異化特點
- Lowest VDD core range for sub-3.6 V battery systems (對比PIC18F66K40-I/PT)
- Twice the Flash memory of K65 family variants (對比PIC18F65K40-I/PT)
- Higher I/O count than 40/44-pin F46K40 family (對比PIC18F46K40-I/PT)
設計說明
The PIC18LF66K40-I/PT has six VDD/VSS pin pairs distributed around the 64-pin TQFP package. Place a 100 nF decoupling capacitor on each VDD pin pair, routed as short as possible (<3 mm trace) directly to the adjacent VSS pin. Add a single 10 uF bulk capacitor at the board input where the MCU is the highest-current IC. The VDD range of 1.8 V to 5.5 V allows direct battery connection but verify the chosen battery chemistry does not exceed 5.5 V under charge (e.g. lithium-ion 4.2 V max is safe). For sub-3.6 V designs, choose the LF variant to avoid the 2.3 V minimum core requirement of the F variant.
The 64-pin TQFP (PT) at 10x10 mm body uses 0.5 mm pitch leads. Use a 4-layer PCB with a continuous ground plane beneath the MCU to minimize EMI and provide a stable reference for the ADC. Trace analog inputs (RA/RE/RF/RG with ANx functions) away from digital switching signals and route them over a single unbroken ground plane. The ECAN RX/TX lines should be routed as an 100 ohm differential pair with 120 ohm termination at each end, and the trace length should be matched within 5 mm. The ICSP pins (RB6/RB7) should be brought to a 2x5 0.1 inch header for in-circuit programming and debugging.
Do not assume the LF variant runs at 5 V - the PIC18LF66K40-I/PT core tops out at 3.6 V even though the I/O pads tolerate 5 V inputs. If your design must regulate at 5 V without an external LDO, use the PIC18F66K40-I/PT instead. Do not exceed the ADC input range (VDD + 0.3 V); tie unused analog inputs to VSS or a known voltage rather than leaving them floating to avoid ADC noise pickup. The CONFIG words must be set to disable unused peripherals (ADC, ECAN) to achieve the lowest sleep current. When migrating from PIC18F45K22 to PIC18LF66K40, note that the ECAN peripheral location differs and the register map requires code changes.
合規資訊
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - for automotive safety-critical applications, use Microchip AEC-Q100 qualified variants in the PIC18F66K40 family (separate part numbers). Lead-free and halogen-free per Microchip material declaration. Conflict minerals compliance reported in Microchip's annual CMRT filing.
