PIC18LF55K42-E/PT - 32KB Flash 8-bit MCU, 48-TQFP-EP | Microchip
料号： PIC18LF55K42-E/PT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.92 | $29.20 |
| 100 | $2.61 | $261.00 |
| 500 | $2.35 | $1,175.00 |
| 1,000 | $2.1 | $2,100.00 |
PIC18LF55K42-E/PT 概述
An 8-bit microcontroller (MCU) is a small computer-on-a-chip built around an 8-bit data bus. It sits within the broader hierarchy of microcontrollers -> embedded processors -> integrated circuits -> semiconductors. The PIC18 family specifically targets high-performance 8-bit applications requiring C-friendly architecture, hardware DMA, and rich peripheral integration. Low-power 'LF' variants like this one extend operating voltage down to 1.8V for battery-powered designs, where XLP (eXtreme Low Power) technology enables nanoWatt sleep currents.
Key features of the PIC18LF55K42-E/PT include 64 MHz maximum CPU clock, 44 configurable I/O pins, an integrated 12-bit ADC2 with computation, hardware DMA for memory-to-memory and memory-to-peripheral transfers, multiple communication peripherals (I2C, SPI, UART/USART), and enhanced PWM with complementary outputs. The -E temperature grade extends operation from -40C to +125C for industrial and harsh-environment applications.
The PIC18 core employs a Harvard architecture with a 16-bit instruction word and 8-bit data path, providing C-friendly addressing and deterministic interrupt latency. Core-independent peripherals such as the CWG (Complementary Waveform Generator), NCO (Numerically Controlled Oscillator), and hardware DMA offload the CPU, allowing complex control loops to run without software intervention. The MAP memory scheme provides separate boot and secure flash regions for bootloader and IP protection.
Typical applications for the PIC18LF55K42-E/PT include industrial sensor nodes, motor control (BLDC and stepper), IoT edge devices, LED lighting controllers, consumer appliance control, and battery-powered instrumentation. The 32KB flash and DMA support make it suitable for protocol stacks such as Modbus, LIN, and basic BLE bridging when paired with an external radio.
When designing with this device, pay attention to decoupling (place 100nF + 1uF near VDD pins), unused-pin tie-off (drive or pull per datasheet), and ICP/ICD programming pin allocation. The 'LF' variant requires VDD between 1.8V and 3.6V, so an LDO or buck converter is required for 5V systems.
This page synthesizes distributor stock data, drop-in compatible alternatives, and practical design notes not found in a single manufacturer datasheet view.
直接替换替代料： PIC18LF55K42-E/PT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC18LF55K42-E/PT （相同外形与封装尺寸） ——差异在于 DAC, DMA, Package, Comparators, PWM Channels.
快速对比工具——选择替代料号进行并排对比：
PIC18LF56K42-E/PT
✅ 直接替换✓ 有现货
$2.15 / 个
查看数据手册 →PIC18F55K42-E/PT
✅ 直接替换✓ 有现货
$1.92 / 个
查看数据手册 →PIC18LF45K42-E/PT
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.49 / 个
查看数据手册 →PIC18LF55K42-E/PT 最大额定值与电气特性
| Core Architecture | PIC18 (8-bit Harvard) |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data SRAM | 2 KB |
| EEPROM | 256 B |
| Maximum CPU Clock | 64 MHz |
| ADC | 12-bit ADC2 with computation |
| DAC | Yes (on-chip) |
| Number of I/O Pins | 44 |
| 工作电源电压 | 1.8 V to 3.6 V |
| 工作温度范围 | -40 C to +125 C (E grade) |
| 封装 | 48-TQFP-EP (7x7 mm) |
| 安装类型 | Surface Mount |
| Communication Interfaces | I2C, SPI, UART/USART |
| DMA | Yes (hardware) |
| MSL 等级 | 3 (168 hours) |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
| Low-Power Technology | XLP (eXtreme Low Power) |
PIC18LF55K42-E/PT 引脚配置
| 引脚 1 | RE3/MCLR — Master Clear (reset) input, also RE3 GPIO |
| 引脚 2 | RA0 — PORTA bit 0 / analog input |
| 引脚 3 | RA1 — PORTA bit 1 / analog input |
| 引脚 4 | RA2 — PORTA bit 2 / analog input |
| 引脚 5 | RA3 — PORTA bit 3 / analog input |
| 引脚 6 | RA4 — PORTA bit 4 / analog input |
| 引脚 7 | RA5 — PORTA bit 5 / analog input |
| 引脚 8 | RA6 — PORTA bit 6 / analog input |
| 引脚 9 | RA7 — PORTA bit 7 / analog input |
| 引脚 10 | VSS — Ground reference |
| 引脚 11 | VDD — Positive supply (1.8V-3.6V) |
| 引脚 12 | RB0 — PORTB bit 0 / analog / IOC |
| 引脚 13 | RB1 — PORTB bit 1 / analog / IOC |
| 引脚 14 | RB2 — PORTB bit 2 / analog / IOC |
| 引脚 15 | RB3 — PORTB bit 3 / analog / IOC |
| 引脚 16 | RB4 — PORTB bit 4 / analog / IOC |
| 引脚 17 | RB5 — PORTB bit 5 / analog / IOC |
| 引脚 18 | RB6 — PORTB bit 6 / ICSPCLK |
| 引脚 19 | RB7 — PORTB bit 7 / ICSPDAT |
| 引脚 20 | VSS — Ground reference |
| 引脚 21 | VDD — Positive supply (1.8V-3.6V) |
| 引脚 22 | RC0 — PORTC bit 0 / analog |
| 引脚 23 | RC1 — PORTC bit 1 / analog |
| 引脚 24 | RC2 — PORTC bit 2 / analog |
| 引脚 25 | RC3 — PORTC bit 3 / analog |
| 引脚 26 | RC4 — PORTC bit 4 / analog |
| 引脚 27 | RC5 — PORTC bit 5 / analog |
| 引脚 28 | RC6 — PORTC bit 6 / analog |
| 引脚 29 | RC7 — PORTC bit 7 / analog |
| 引脚 30 | VSS — Ground reference |
| 引脚 31 | VDD — Positive supply (1.8V-3.6V) |
| 引脚 32 | RD0 — PORTD bit 0 / analog |
| 引脚 33 | RD1 — PORTD bit 1 / analog |
| 引脚 34 | RD2 — PORTD bit 2 / analog |
| 引脚 35 | RD3 — PORTD bit 3 / analog |
| 引脚 36 | RD4 — PORTD bit 4 / analog |
| 引脚 37 | RD5 — PORTD bit 5 / analog |
| 引脚 38 | RD6 — PORTD bit 6 / analog |
| 引脚 39 | RD7 — PORTD bit 7 / analog |
| 引脚 40 | VSS — Ground reference |
| 引脚 41 | VDD — Positive supply (1.8V-3.6V) |
| 引脚 42 | RF0 — PORTF bit 0 / analog |
| 引脚 43 | RF1 — PORTF bit 1 / analog |
| 引脚 44 | RF2 — PORTF bit 2 / analog |
| 引脚 45 | RF3 — PORTF bit 3 / analog |
| 引脚 46 | RF4 — PORTF bit 4 / analog |
| 引脚 47 | RF5 — PORTF bit 5 / analog |
| 引脚 48 | RF6 — PORTF bit 6 / analog |
典型应用
PIC18LF55K42-E/PT 适用于 6 应用s: BLDC Motor Control, Industrial Sensor Node, Battery-Powered IoT Edge Device, LED Lighting Controller, Consumer Appliance Control, Automotive Body Electronics (Non-Safety).
BLDC Motor Control
The PIC18LF55K42-E/PT is well matched to BLDC and PMSM motor control in compact 3.3V systems. The integrated Complementary Waveform Generator (CWG) provides hardware dead-band generation, the 12-bit ADC2 samples back-EMF at high speed, and the DMA engine offloads sample timing from the CPU. With 64 MHz core clock and CIPs (Core Independent Peripherals), the MCU can run sensorless FOC at 4-8 kHz switching frequency. Its XLP features minimize sleep current during standby. Pair it with a gate driver like MCP8021 or MCP8022 for a compact 3-phase inverter; the 48-TQFP-EP package dissipates ~1W at full CPU load without external heatsinking.
推荐
Industrial Sensor Node
For distributed industrial sensing (4-20mA loops, RTD/thermocouple conditioning, Modbus nodes), the PIC18LF55K42-E/PT provides ample headroom with 32 KB flash for Modbus RTU stacks and 2 KB RAM for buffer handling. The 12-bit ADC2 with computation performs oversampling and averaging in hardware, freeing CPU cycles. Multiple UART channels enable RS-485 Modbus master/slave topologies. Hardware DMA supports continuous ADC-to-RAM transfers without CPU intervention. The -E temperature grade (-40C to +125C) supports outdoor and cabinet-mounted deployments. Operating from 1.8V to 3.6V it interfaces directly to modern low-power sensors and LoRaWAN modules.
推荐
Battery-Powered IoT Edge Device
XLP (eXtreme Low Power) features make the PIC18LF55K42-E/PT ideal for battery-powered IoT edge nodes running from 1.8V to 3.6V. Sleep currents in the nanoWatt range extend coin-cell life to multiple years. The integrated DMA, ADC2 with computation, and UART peripherals enable event-driven wake/sleep cycles with no CPU involvement for routine sampling. The 32 KB flash accommodates LoRaWAN or BLE-bridging protocol stacks. Hardware AES (in some K42 variants) provides secure communication, and the MAP memory scheme enables secure bootloaders for OTA firmware updates. Recommended for smart locks, asset trackers, and wireless sensor modules.
推荐
LED Lighting Controller
The PIC18LF55K42-E/PT drives multi-channel LED lighting systems using its 16-bit PWM with complementary outputs and CWG for half-bridge topology. Each PWM channel supports independent duty and dead-band control, enabling smooth color mixing and dimming. Hardware DMA synchronizes PWM updates to avoid flicker, and the 12-bit DAC provides analog reference for tunable-white or constant-current drivers. The -40 to +125C operating range suits indoor and outdoor luminaires. With 32 KB flash, the MCU supports DALI, DMX, or 0-10V dimming protocols alongside safety diagnostics (thermal foldback, open-LED detection).
推荐
Consumer Appliance Control
Washing machines, dishwashers, coffee makers, and small kitchen appliances benefit from the PIC18LF55K42-E/PT's blend of 32 KB flash, motor-control PWM, and rich communication peripherals. The MCU drives user-interface displays (LEDs, character LCDs) while managing BLDC pumps, valves, and heaters via PWM and ADC feedback loops. CIPs handle safety-critical timing (overcurrent, overtemperature) independently of the CPU. The wide operating voltage (1.8-3.6V) simplifies supply design from a rectified 3.3V rail. The 48-TQFP-EP provides a low-profile footprint for slim appliance form factors.
推荐
Automotive Body Electronics (Non-Safety)
For non-safety automotive body applications such as seat controllers, mirror adjusters, ambient lighting, and HVAC flap motors, the PIC18LF55K42-E/PT offers 44 I/O, LIN bus support, and the -E temperature grade (-40C to +125C). The PIC18F55K42 variant supports 5V I/O levels required by automotive bus standards, while this LF variant suits 3.3V subsystems. Multiple PWM channels drive small brushed DC motors, and the DMA engine handles communication buffer management for LIN frames. Note: this part is not AEC-Q100 qualified; use PIC18F55K42 with AEC-Q100 documentation for production automotive programs.
推荐
推荐产品汇总
工程参考数据： PIC18LF55K42-E/PT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC18LF56K42-E/PT | PIC18F55K42-E/PT | PIC18LF45K42-E/PT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-TQFP-EP (7x7 mm) | 48-TQFP-EP (7x7 mm) - same | 48-TQFP-EP (7x7 mm) - same | 48-TQFP-EP (7x7 mm) - same |
| Program Memory (Flash) | 32 KB | 48 KB (+50%) | 32 KB (same) | 32 KB (same) |
| Data SRAM | 2 KB | 4 KB (+100%) | 2 KB (same) | 2 KB (same) |
| Operating Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 2.3 V to 5.5 V | 1.8 V to 3.6 V |
| Maximum CPU Clock | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| I/O Pins | 44 | 44 | 44 | 44 (subset used, 40-pin die) |
| Temperature Grade | -40C to +125C (E) | -40C to +125C (E) | -40C to +125C (E) | -40C to +125C (E) |
| Low-Power (XLP) | Yes | Yes | Yes | Yes |
关键差异点
- 32 KB flash at 64 MHz with DMA and CIPs （对比 PIC18LF46K22-E/MV)
- XLP nanoWatt sleep with 1.8V minimum VDD （对比 PIC18F55K42-E/PT)
- 12-bit ADC2 with computation （对比 PIC18LF47K40-I/PT)
设计说明
Place a 100 nF ceramic decoupling capacitor as close as possible to each VDD/VSS pair (5 pairs total on this 48-pin TQFP-EP). Add one bulk 1 uF to 10 uF capacitor near the highest-current VDD pin to handle transient load steps when peripherals switch. The 'LF' variant operates down to 1.8 V, so verify that your LDO maintains regulation at the MCU's peak Iq (typically 15 mA active at 64 MHz). For battery applications, MCP1700 LDO adds only 1.6 uA quiescent overhead.
Route ICSPDAT and ICSPCLK (RB6/RB7) to a 2x5 0.1-inch header for in-circuit serial programming and debugging. Place the programming header near the MCU with no series resistors or buffers in line, and add ESD protection diodes if the connector is user-accessible. The exposed thermal pad (EP) on the TQFP package should be soldered to a grounded copper pour to improve thermal dissipation and mechanical stability, even though the LF variant dissipates minimal power.
Do not apply 5 V signals to any I/O pin when VDD is below 3.0 V - the PIC18LF55K42's I/O are 5V-tolerant only when VDD >= 3V. For 3.3V designs interfacing to 5V peripherals, use a level translator like the TXS0108E. Always configure unused I/O pins as outputs driving low to minimize sleep current and prevent floating-input oscillations. The MCLR pin must be pulled high through a 10 kohm resistor unless external reset control is intended.
合规信息
RoHS compliant per Microchip product page. Industrial -E temperature grade (-40C to +125C). NOT AEC-Q100 qualified; for automotive safety applications use PIC18F55K42 with AEC-Q100 documentation. Lead-free and halogen-free per Microchip declaration.