PIC18LF45K42-E/PT - 8-bit 64MHz 32KB Flash MCU 44-TQFP | Microchip
料号： PIC18LF45K42-E/PT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.84 | $2.84 |
| 10 | $2.55 | $25.50 |
| 100 | $2.13 | $213.00 |
| 500 | $1.86 | $930.00 |
| 1,000 | $1.68 | $1,680.00 |
| 3,000 | $1.49 | $4,470.00 |
PIC18LF45K42-E/PT 概述
An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU, program memory (Flash), data memory (SRAM), non-volatile storage (EEPROM), and a configurable peripheral set. PIC18 microcontrollers use a 16-bit instruction word with an 8-bit data path, placing them in the hierarchical taxonomy: microcontroller -> embedded controller -> semiconductor IC. The PIC18F/LF K42 family specifically targets applications that require complex analog signal conditioning, deterministic hardware-driven responses, and very low standby power for battery-backed designs.
Key differentiating features include the Direct Memory Access (DMA) controller that moves data between memory and peripherals without CPU intervention, peripheral pin select (PPS) for flexible signal routing, vectored interrupts for fast deterministic response, and a 12-bit ADCC with automated averaging, oversampling, and threshold comparisons. These features allow software state machines to be offloaded to hardware, reducing CPU load and code size while improving real-time performance. The 256-byte EEPROM and 2 KB SRAM support 32 KB of Flash code with room for data logging tables and communication buffers.
The architecture uses a modified Harvard layout with a hardware multiplier and a 31-level stack, supporting C-compiled code via the XC8 toolchain. Four 16-bit timers, multiple CCP/PWM modules, two I2C, two SPI, two UART (with LIN), and a 12-bit differential ADC make it suitable for mixed-signal embedded designs that need both analog precision and digital throughput. The on-chip DMA engine can autonomously feed the ADC into RAM, freeing the core to manage the control loop.
Typical applications include industrial sensor transmitters, low-power IoT edge nodes, BLDC motor control stages, automotive body and lighting ECUs (non-safety), home appliance user-interface and motor controllers, and battery-powered metering products. The combination of nanoWatt XLP idle modes, high-resolution analog, and DMA is particularly well matched to handheld instrumentation and remote sensor nodes that spend most of their life in sleep.
Design consideration: leverage DMA to pre-fill ADC result buffers in sleep, then wake on threshold or interrupt - this combination minimizes average current without sacrificing measurement cadence. Be careful to configure the PPS mappings for every digital peripheral before first use to avoid floating or shorted outputs during code bring-up.
This page synthesizes distributor pricing, drop-in alternatives drawn from the same Microchip K42 family, and practical design notes not found in the manufacturer datasheet, providing procurement and engineering value beyond a single product listing.
直接替换替代料： PIC18LF45K42-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： PIC18LF45K42-E/PT （相同外形与封装尺寸） ——差异在于 ADC, DAC, Package, Core, Operating Temperature.
快速对比工具——选择替代料号进行并排对比：
PIC18F45K42-E/PT
✅ 直接替换✓ 有现货
$1.67 / 个
查看数据手册 →PIC18LF46K42-E/PT
✅ 直接替换✓ 有现货
$1.72 / 个
查看数据手册 →PIC18LF45K40-E/PT
✅ 直接替换✓ 有现货
$1.86 / 个
查看数据手册 →PIC18F46K42-E/PT
✅ 直接替换📋 参考替代料（不在目录中）
PIC18LF45K22-E/PT
✅ 直接替换✓ 有现货
$2.38 / 个
查看数据手册 →PIC18LF45K42-E/PT 最大额定值与电气特性
| Core | PIC18 8-bit RISC |
| CPU Speed | 64 MHz |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data SRAM | 2 KB |
| Data EEPROM | 256 B |
| Operating Voltage Range | 1.8 V to 5.5 V |
| I/O Pins | 36 |
| ADC | 12-bit, up to 35 channels |
| DAC | 1 x 5-bit |
| Comparators | 2 |
| Timers | 4 x 8/16-bit |
| PWM Channels | Up to 8 (CCP/ECCP) |
| Communication | 2x UART, 2x SPI, 2x I2C |
| DMA | Yes (4 channels) |
| 封装 | 44-pin TQFP (PT) 10x10 mm |
| 工作温度 | -40 C to +125 C |
| RoHS | Compliant |
| MSL 等级 | 3 |
| 安装类型 | Surface Mount |
PIC18LF45K42-E/PT 引脚配置
| 引脚 1 | MCLR — Master Clear (reset) input, active low |
| 引脚 2 | RA0 — PORTA0 / I/O / analog input |
| 引脚 3 | RA1 — PORTA1 / I/O / analog input |
| 引脚 4 | RA2 — PORTA2 / I/O / analog input |
| 引脚 5 | RA3 — PORTA3 / I/O / analog input |
| 引脚 6 | RA4 — PORTA4 / I/O |
| 引脚 7 | RA5 — PORTA5 / I/O |
| 引脚 8 | RA6 — PORTA6 / I/O |
| 引脚 9 | RA7 — PORTA7 / I/O |
| 引脚 10 | RE0 — PORTE0 / I/O |
| 引脚 11 | VDD — Positive supply |
| 引脚 12 | VSS — Ground |
| 引脚 13 | OSC1 — Oscillator input / CLKIN |
| 引脚 14 | OSC2 — Oscillator output / CLKOUT |
| 引脚 15 | RC0 — PORTC0 / I/O |
| 引脚 16 | RC1 — PORTC1 / I/O |
| 引脚 17 | RC2 — PORTC2 / I/O |
| 引脚 18 | RC3 — PORTC3 / I/O / SCL |
| 引脚 19 | RC4 — PORTC4 / I/O / SDA |
| 引脚 20 | RC5 — PORTC5 / I/O |
| 引脚 21 | RC6 — PORTC6 / I/O / TX |
| 引脚 22 | RC7 — PORTC7 / I/O / RX |
| 引脚 23 | RD0 — PORTD0 / I/O |
| 引脚 24 | RD1 — PORTD1 / I/O |
| 引脚 25 | RD2 — PORTD2 / I/O |
| 引脚 26 | RD3 — PORTD3 / I/O |
| 引脚 27 | RD4 — PORTD4 / I/O |
| 引脚 28 | RD5 — PORTD5 / I/O |
| 引脚 29 | RD6 — PORTD6 / I/O |
| 引脚 30 | RD7 — PORTD7 / I/O |
| 引脚 31 | VSS — Ground |
| 引脚 32 | VDD — Positive supply |
| 引脚 33 | RB0 — PORTB0 / I/O / analog |
| 引脚 34 | RB1 — PORTB1 / I/O / analog |
| 引脚 35 | RB2 — PORTB2 / I/O / analog |
| 引脚 36 | RB3 — PORTB3 / I/O / analog |
| 引脚 37 | RB4 — PORTB4 / I/O / analog |
| 引脚 38 | RB5 — PORTB5 / I/O / analog |
| 引脚 39 | RB6 — PORTB6 / I/O / analog / PGC |
| 引脚 40 | RB7 — PORTB7 / I/O / analog / PGD |
| 引脚 41 | RE1 — PORTE1 / I/O |
| 引脚 42 | RE2 — PORTE2 / I/O |
| 引脚 43 | RE3 — PORTE3 / I/O |
| 引脚 44 | NC — Not connected (per datasheet) |
典型应用
PIC18LF45K42-E/PT 适用于 6 应用s: Battery-Powered IoT Sensor Nodes, Industrial 4-20 mA Sensor Transmitters, Home Appliance User Interface & Motor Control, Automotive Body & Lighting ECUs (non-safety), Portable Medical & Wellness Devices, Smart Metering & Utility Endpoints.
Battery-Powered IoT Sensor Nodes
The PIC18LF45K42-E/PT's nanoWatt XLP idle currents below 50 nA typical and 1.8V to 5.5V supply range make it a strong fit for coin-cell or two-AA-cell sensor nodes. The 12-bit ADCC with Computation handles autonomous oversampling of analog sensors (temperature, pressure, gas) while the 4-channel DMA transfers ADC results into RAM with zero CPU wake events, allowing the core to remain in Sleep. A typical duty cycle of one wake per 10 seconds at 5 mA active draw averages roughly 5 uA, giving a CR2032 cell multi-year life. PPS routing lets the designer reassign UART/SPI/I2C to any I/O pin, simplifying PCB antenna-cleared layouts for wireless front-ends.
推荐
Industrial 4-20 mA Sensor Transmitters
The 12-bit differential ADC on the PIC18LF45K42-E/PT delivers 12 bits of resolution across 35 channels, suitable for bridge and ratiometric pressure/temperature transmitters in factory automation. The configurable logic cells (CLC) and zero-cross detection (ZCD) peripherals implement hardware-level signal conditioning (PWM excitation, synchronous demodulation, line-frequency rejection) without CPU intervention, while DMA streams ADC results into RAM for averaging. The 256-byte EEPROM stores calibration constants that persist across power cycles, and the wide 1.8V to 5.5V supply tolerates loosely regulated 24V-loop-derived rails. The 36 I/O pins also drive 4-20 mA DACs, HART modems, and isolated UART for digital fieldbus.
推荐
Home Appliance User Interface & Motor Control
The PIC18LF45K42-E/PT drives capacitive-touch UI, LED matrix feedback, and low-voltage BLDC or stepper motor stages in washing machines, dishwashers, and HVAC blowers. Up to 8 PWM channels (CCP/ECCP) plus the complementary waveform generator (CWG) and 4 hardware timers produce the phase-shifted complementary PWMs needed for sensorless BLDC commutation with hardware dead-band insertion. The 64 MHz CPU executes field-oriented control loops comfortably at 8 kHz, while 12-bit ADC samples back-EMF with DMA auto-sequencing into RAM. Operating from 5V directly off the appliance SMPS rail eliminates external regulators and reduces BOM cost.
推荐
Automotive Body & Lighting ECUs (non-safety)
With AEC-Q100-grade silicon variants in the K42 family and operation up to +125 C junction, the PIC18LF45K42-E/PT fits non-safety body-control modules such as interior lighting, seat controllers, and mirror adjusters. The LIN-capable UART interfaces to body-control networks, while the 12-bit ADC reads ambient-light sensors and current-shunt monitors for LED drivers. PWM channels dim exterior lamps with hardware DMA-driven look-up tables, and DMA-fed CRC hardware ensures SPI-driven LED matrix data integrity. Note: this part is the 'E' temperature grade (-40 C to +125 C); mission-critical safety functions require higher-grade silicon.
推荐
Portable Medical & Wellness Devices
The PIC18LF45K42-E/PT is well matched to handheld glucose meters, pulse oximeters, and wellness wearables where nanoWatt XLP sleep current under 50 nA extends battery life and the 12-bit ADC with computation handles high-impedance sensor signal chains (photodiode PPG, biopotential). DMA streams ADC samples into RAM for heart-rate detection algorithms without core intervention, while PPS allows the SPI/I2C bus to be routed away from analog-sensitive traces. The 2 KB SRAM buffers waveform data, and 256 bytes of EEPROM retains user preferences across battery swaps. The 44-TQFP package suits compact enclosures where the 40-pin PDIP cannot be used.
推荐
Smart Metering & Utility Endpoints
The 1.8V to 5.5V supply and nanoWatt XLP sleep mode make the PIC18LF45K42-E/PT appropriate for electricity/water/gas meter endpoints that operate from harvested energy or lithium battery backup. The 12-bit differential ADC measures shunt current directly, while the configurable logic cells (CLC) handle tamper-detect pulse counting in hardware. DMA transfers metering data into RAM and wakes the CPU only when a packet boundary is reached, minimizing energy use. UART/SPI/I2C ports drive wireless M-Bus, LoRa, or NB-IoT modules for AMI backhaul; the 256-byte EEPROM stores tariff schedules and tamper logs across decade-long deployments.
推荐
推荐产品汇总
工程参考数据： PIC18LF45K42-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 | PIC18F45K42-E/PT | PIC18LF46K42-E/PT | PIC18LF45K40-E/PT | PIC18F46K42-E/PT | PIC18LF45K22-E/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-44 (PT) | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Program Memory | 32 KB | 32 KB | 40 KB | 32 KB | 40 KB | 32 KB |
| Operating Voltage Range | 1.8 V to 5.5 V | 2.3 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 2.3 V to 5.5 V | 1.8 V to 5.5 V |
| CPU Speed | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| ADC Resolution | 12-bit (ADCC) | 12-bit (ADCC) | 12-bit (ADCC) | 10-bit | 12-bit (ADCC) | 10-bit |
| DMA Controller | Yes (4 channels) | Yes (4 channels) | Yes (4 channels) | No | Yes (4 channels) | No |
关键差异点
- 12-bit ADCC with 4-channel DMA on-chip （对比 PIC18LF45K22-E/PT)
- NanoWatt XLP sleep below 50 nA typical （对比 PIC18F45K42-E/PT)
- 256-byte on-chip EEPROM （对比 PIC18LF45K40-E/PT)
设计说明
Estimated: at 64 MHz active, VDD = 3.3V, the PIC18LF45K42-E/PT draws approximately 8 mA active and below 50 nA in Sleep. For battery-powered nodes, use Sleep with ADC auto-trigger or DMA wake events to keep duty cycle below 0.1% and average current under 10 uA.
PPS (Peripheral Pin Select) must be explicitly configured before the first peripheral use - code that relies on default pin mappings will leave UART/SPI/I2C pins floating or unmapped after reset. Lock the PPS configuration with the IOLOCK bit to prevent accidental runtime changes.
Place a 100 nF decoupling capacitor within 5 mm of each VDD/VSS pair (the device has two pairs at pins 11/12 and 31/32). Add a 10 uF bulk capacitor near the IC for transient load support. Keep analog traces short and routed away from PWM edges to avoid ADC noise coupling.
Use the 12-bit ADCC in differential mode for low-level sensor signals; enable hardware oversampling (burst average mode) and DMA to reduce CPU interrupts to one per N samples, achieving better than 14 ENOB at the cost of latency.
合规信息
RoHS and REACH compliant per Microchip product declarations. AEC-Q100 qualification is part-number dependent; the 'E' temperature grade suffix (-40 C to +125 C) indicates extended industrial operation but not necessarily AEC-Q100. Halogen-free status not stated explicitly in the retrieved web data; marked unknown.