PIC18LF24K40T-I/SO - 64MHz 8-bit XLP MCU 16KB Flash SOIC-28 | Microchip
MPN： PIC18LF24K40T-I/SO ✓ 啟用中PIC18LF24K40T-I/SO 概覽
An 8-bit PIC (Peripheral Interface Controller) microcontroller is a RISC-based MCU that combines a Harvard-style CPU with on-chip Flash, RAM, EEPROM and rich peripherals. The PIC18 K40 family is part of the broader 8-bit MCU hierarchy (8-bit microcontroller -> RISC MCU -> microcontroller -> embedded processor) and adds Microchip's Core Independent Peripherals (CIPs) for offloading tasks from the CPU, reducing power and code footprint.
Key features include a 10-bit ADC with computation, a 5-bit DAC, two comparators, configurable Complementary Waveform Generator (CWG), Capture/Compare/PWM (CCP) modules, Hardware Limit Timer (HLT), Windowed Watchdog Timer (WWDT), CRC/Memory Scan and Zero-Cross Detect. Twenty-five general-purpose I/O pins and PPS (Peripheral Pin Select) provide flexible signal routing, while nanoWatt XLP technology drives sleep currents below typical competitive 8-bit MCUs.
Architecturally the device uses an enhanced mid-range RISC core with hardware multiply, a 31-level stack and a two-level interrupt controller. Up to four hardware timers and the 10-bit ADC2 with automated Accumulate, Average and Burst Average modes minimise firmware overhead for sensor-conditioning loops.
Typical applications include low-power IoT sensor nodes, battery-powered handheld instruments, consumer white goods, LED lighting controllers and automotive interior modules. Designers use it when code size, peripheral variety and low standby current matter more than raw MHz performance.
When designing with this part, prioritise PPS assignments early so each peripheral signal has a documented pin before PCB layout freeze, and budget Flash for a Fail-Safe Clock Monitor plus ICD 3 / PICkit 4 in-circuit debug headers.
This page consolidates distributor pricing, pin-compatible PIC18 alternates and practical design notes beyond the Microchip datasheet so engineers can pick devices faster.
直接替換替代品，適用於 PIC18LF24K40T-I/SO — 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： PIC18LF24K40T-I/SO （相同外形與佔位） — 差異在於 Package, ADC, Operating Temperature, Program Memory (Flash), DAC.
PIC18LF24K40-I/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF24K40-E/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF24K22T-I/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF24K40-I/SS
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF24K40-I/SP
✅ 直接替換聯絡詢價
查看資料表 →PIC18F24K40T-I/SO
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18LF24K40T-I/SO 最大額定值與電氣特性
| Core Architecture | 8-bit PIC18 RISC |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data Memory (SRAM) | 1 KB |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 64 MHz |
| Operating Voltage Range | 1.8 V to 3.6 V |
| Number of I/O Pins | 25 |
| ADC | 10-bit, multiple channels (ADC2) |
| DAC | 5-bit |
| Comparators | 2 |
| CCP / PWM Modules | Yes (CCP + CWG) |
| Timers | Multiple 8/16-bit with HLT |
| Watchdog | Windowed WDT |
| Peripheral Pin Select (PPS) | Yes |
| 工作溫度 | -40C to +85C (Industrial) |
| 封裝 | 28-pin SOIC (SO), 7.50 mm width |
| 安裝類型 | Surface Mount |
| MSL 等級 | 1 |
| RoHS 狀態 | Compliant |
PIC18LF24K40T-I/SO 腳位配置
| 腳位 1 | MCLR/VPP/RE3 — Master Clear (reset) input / programming voltage / Port E bit 3 |
| 腳位 2 | RA0 — PORTA bit 0 (analog / digital I/O) |
| 腳位 3 | RA1 — PORTA bit 1 (analog / digital I/O) |
| 腳位 4 | RA2 — PORTA bit 2 (analog / digital I/O) |
| 腳位 5 | RA3 — PORTA bit 3 (analog / digital I/O) |
| 腳位 6 | RA4 — PORTA bit 4 (analog / digital I/O) |
| 腳位 7 | RA5 — PORTA bit 5 (analog / digital I/O) |
| 腳位 8 | RA6 — PORTA bit 6 (analog / digital I/O) |
| 腳位 9 | RA7 — PORTA bit 7 (analog / digital I/O) |
| 腳位 10 | GND — Ground reference |
| 腳位 11 | VDD — Positive supply (1.8 V to 3.6 V for LF variant) |
| 腳位 12 | RB0 — PORTB bit 0 (PPS-capable / analog / interrupt-on-change) |
| 腳位 13 | RB1 — PORTB bit 1 (PPS-capable / analog / interrupt-on-change) |
| 腳位 14 | RB2 — PORTB bit 2 (PPS-capable / analog / interrupt-on-change) |
| 腳位 15 | RB3 — PORTB bit 3 (PPS-capable / analog / interrupt-on-change) |
| 腳位 16 | RB4 — PORTB bit 4 (PPS-capable / analog / interrupt-on-change) |
| 腳位 17 | RB5 — PORTB bit 5 (PPS-capable / analog / interrupt-on-change) |
| 腳位 18 | RB6 — PORTB bit 6 (ICSPCLK / interrupt-on-change) |
| 腳位 19 | RB7 — PORTB bit 7 (ICSPDAT / interrupt-on-change) |
| 腳位 20 | RC0 — PORTC bit 0 (PPS-capable / analog) |
| 腳位 21 | RC1 — PORTC bit 1 (PPS-capable / analog) |
| 腳位 22 | RC2 — PORTC bit 2 (PPS-capable / analog) |
| 腳位 23 | RC3 — PORTC bit 3 (PPS-capable / analog) |
| 腳位 24 | RC4 — PORTC bit 4 (PPS-capable / analog) |
| 腳位 25 | RC5 — PORTC bit 5 (PPS-capable / analog) |
| 腳位 26 | RC6 — PORTC bit 6 (PPS-capable / analog / TX for EUSART) |
| 腳位 27 | RC7 — PORTC bit 7 (PPS-capable / analog / RX for EUSART) |
| 腳位 28 | AVDD — Analog positive supply (typically tied to VDD) |
典型應用
PIC18LF24K40T-I/SO 適用於 6 應用s: Battery-Powered IoT Sensor Node, White Goods Control Board, LED Lighting Color Controller, Consumer Health Wearable, Industrial Touch / Capacitive Keypad, Automotive Interior LED Driver (Auxiliary).
Battery-Powered IoT Sensor Node
The PIC18LF24K40T-I/SO is purpose-built for battery-powered IoT nodes because its 1.8-3.6 V LF supply range and nanoWatt XLP sleep currents under 50 nA let designs survive for years on two AA cells. The 64 MHz core handles BLE-beacon or LoRa-modem drivers while the 10-bit ADC with averaging reads soil, temperature or vibration sensors without external instrumentation. Placed between the battery and the sensor load, with a CWG-generated PWM switching the regulator, the device delivers 16 MIPS at 3.3 V and idles below 50 nA when the radio sleeps. Compared to a Cortex-M0, the PIC18 K40 offers fewer MIPS but a smaller code footprint and lower active current at the same task.
推薦
White Goods Control Board
Appliance makers use the PIC18LF24K40T-I/SO on washer, dryer and dishwasher control boards because the 28-pin SOIC footprint is retrofit-compatible with earlier PIC18 designs. The CWG and CCP modules generate zero-cross triac drives for heater and motor PWM at up to 64 MHz clock, the comparators trigger the ZCD protection circuit, and HLT (Hardware Limit Timer) supervises safety cutoffs without CPU intervention. Placed at the centre of the appliance's 3.3 V rail with a 16 KB firmware containing UI handling, motor-control loops and diagnostics, the part runs cool and inexpensive. Its -40C to +85C industrial rating handles the kitchen thermal envelope.
推薦
LED Lighting Color Controller
Smart LED drivers including RGBCCT controllers use the PIC18LF24K40T-I/SO as the host because the 5-bit DAC plus CWG produce the smooth flicker-free PWM needed for high-CRI white and color mixing. With Peripheral Pin Select, designers re-route oscillator-tied PWM to any output pin, freeing layout channels during PCB iterations. The part handles 25 GPIO simultaneously for DMX or DALI signalling and can sleep under 1 uA between radio commands, preserving bulb longevity. Compared to a 16-bit MCU, the 8-bit PIC retains a tight power budget while supplying ample cycles for animation tables.
推薦
Consumer Health Wearable
Wearable fitness trackers and pulse oximeter designs adopt the PIC18LF24K40T-I/SO for its XLP nanoWatt sleep plus small SOIC that fits inside a wristband. The 10-bit ADC with averaging digitises optical heart-rate photodiode currents, and the 1 KB SRAM caches step-algorithms before BLE hand-off. Placed alongside the Li-ion charger IC and I2C accelerometer, the device wakes on RTC alarm (~0.7 uA), reads the sensor in 200 us and re-sleeps. Its sub-1 uA idle outperforms many ARM Cortex-M0 devices at this duty cycle.
推薦
Industrial Touch / Capacitive Keypad
Industrial HMI panels with touch-sensitive keys rely on the PIC18LF24K40T-I/SO because its Hardware CVD (Capacitive Voltage Divider) peripheral measures touch events without external circuitry, freeing the CPU from polling. With 16 KB Flash the firmware can hold key maps, debounce tables and Modbus RTU state machines while the dedicated HLT supervises watchdogs and CRC ensures firmware integrity via memory scan. Placed next to the FPC connector, it scans 25 channels at low noise - suited to glove-on touch in factory environments where traditional resistive buttons fail.
推薦
Automotive Interior LED Driver (Auxiliary)
Auxiliary interior accent lighting (door-panel mood lights, footwell strips) uses the PIC18LF24K40T-I/SO because its 28-pin SOIC mates directly with existing PIC18 K40 footprints in body-control modules. Although the LF variant lacks AEC-Q100, hobby and aftermarket designers leverage its 64 MHz CWG for flicker-free dimming, plus the comparator for over-temperature shutdown using an NTC divider. Placed at the 12 V/3.3 V node downstream of a TVS clamp, the IC tolerates load-dump transients when paired with a CSA-rated LDO. Engineers aiming for full automotive qualification should step up to a PIC18F24K40-E Q-grade variant.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18LF24K40T-I/SO — 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 | PIC18LF24K40-I/SO | PIC18LF24K40-E/SO | PIC18LF24K40-I/SS | PIC18LF24K40-I/SP | PIC18LF24K22T-I/SO | PIC18F24K40T-I/SO |
|---|---|---|---|---|---|---|---|
| Package | 28-pin SOIC | 28-pin SOIC - same | 28-pin SOIC - same | 28-pin SSOP - smaller footprint | 28-pin SPDIP - through-hole | 28-pin SOIC - same | 28-pin SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Operating Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 2.3 V to 5.5 V |
| Maximum CPU Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Flash Memory | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 8 KB | 16 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 0.5 KB (approximate, family dependent) | 1 KB |
| Temperature Range | -40C to +85C (I) | -40C to +85C (I) | -40C to +125C (E) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) |
| Price (qty 1, USD) | 2.96 | approximately 2.96 | approximately 3.20 (premium for extended grade) | approximately 2.96 | approximately 3.10 (through-hole premium) | approximately 2.80 (smaller Flash discount) | approximately 3.00 |
主要差異化特點
- Larger 16 KB Flash vs 8 KB on the K22 family (對比PIC18LF24K22T-I/SO)
- Wide 1.8-3.6 V LF voltage range (對比PIC18F24K40T-I/SO)
- XLP nanoWatt sleep under 50 nA (對比PIC18LF23K22T-I/SO)
設計說明
At 3.3 V VDD and 64 MHz CPU clock, the PIC18LF24K40T-I/SO draws approximately 8-10 mA active (per typical Microchip datasheet figures). Falling back to 32 MHz drops active current near 5 mA and is often the best trade for sensor-node duty cycled applications. Add a 1 uF X7R bypass plus a 100 nF decoupling capacitor directly at pins 11 (VDD) and 28 (AVDD) within 5 mm of the package, plus a 100 nF on the MCLR pin; pin 1 MCLR should be pulled up through a 4.7 kohm to VDD to keep in-circuit debug predictable during noisy transients.
Estimated thermal resistance for the 28-pin SOIC on a 1-square-inch 2 oz copper pour is approximately 80 C/W. The MCU at 3.3 V and 10 mA active dissipates ~33 mW, so junction rise is only ~2.6 C above ambient, which is negligible. The Hotenda entry lists a 7.50 mm body width, and designers report stable operation in enclosed white-goods housings without active cooling.
Route ICSPCLK (RB6) and ICSPDAT (RB7) to a 0.1 inch header or test pad even on production boards so PICkit 4 or ICD 4 can attach without rework. Keep the MCLR line short and shield it from adjacent PWM traces when the CWG outputs drive triacs. Place the crystal or external resonator within 5 mm of OSC1/OSC2 if used, with a clean ground pour around it; bypass VDD with a separate ferrite bead if you share the rail with high-current actuators.
Common pitfalls: configuring ANSEL on unused analog pins to default analog mode, which leaves them in high-impedance and noisy state; failing to clear PPS latch before reconfiguring, which can cause routes to persist across resets (use PPSLOCK unlock sequence); and writing 16-bit configuration words without the correct unlock sequence, which locks the device. Always check the latest PIC18F24K40 datasheet revision before freeze-locking any configuration because Microchip renumbers configuration bits between revisions.
合規資訊
RoHS compliant per Microchip product family datasheet. AEC-Q100 qualification status not listed for the LF I-grade variant; for AEC-Q100 designs use the PIC18F24K40-E/Q automotive qualified grade in the same 28-pin SOIC footprint.
