PIC18LF24K50-E/ML - 8-bit USB MCU, 16KB Flash, 28-QFN | Microchip
料号： PIC18LF24K50-E/ML ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.62 | $26.20 |
| 100 | $2.3 | $230.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.85 | $1,850.00 |
| 3,000 | $1.72 | $5,160.00 |
PIC18LF24K50-E/ML 概述
A microcontroller (MCU) is a single-chip computer that combines a CPU, RAM, non-volatile program memory, and programmable peripherals. PIC18 microcontrollers use a 16-bit modified Harvard architecture with separate program and data buses plus a hardware multiplier, occupying the 8-bit segment of Microchip's product hierarchy (8-bit PIC -> 16-bit PIC24 -> 32-bit PIC32). Within that 8-bit family, the LF sub-line is the low-voltage, low-power variant built on enhanced Flash process technology for portable applications where supply current and standby drain dominate the energy budget.
Key features include the integrated USB 2.0 full-speed transceiver with on-chip termination and pull-up generation (no external crystal required for USB), 25 I/O pins with peripheral pin select (PPS) flexibility, 10-bit ADC with up to 14 channels, two analog comparators, three timers, an EUSART, two MSSP ports for SPI and I2C (master and slave), and on-chip mTouch capacitive sensing hardware. The CTMU module supports time-based touch measurement and a peak 75 mA source/sink capability on selected pins enables direct LED drive without external drivers.
Architecturally the part pairs a 16-bit instruction word Flash with a 16-by-16 hardware multiplier and a 31-level hardware stack, an unusual depth for an 8-bit core that simplifies deeply nested state machines. CIP (Core Independent Peripheral) blocks such as CLC, ECCP, and the NUM (Numerically Controlled Oscillator) let many control loops run without CPU intervention, freeing the core for communication and application logic. The LF suffix denotes the 1.8 V minimum Vdd variant.
Typical applications include USB HID peripherals (keyboards, mice, custom input devices), USB-to-UART bridges, low-cost data loggers, sensor hubs with USB enumeration, and battery-powered consumer devices. The combination of integrated USB, XLP sleep modes, and PPS-based flexible I/O mapping is well suited to compact PCB designs that must wake on USB attach and consume minimal standby power.
When designing with this device, pay attention to the USB bus-powering envelope: the internal 3.3 V regulator must have its decoupling capacitor within the recommended layout to avoid Vdd ripple exceeding USB signaling thresholds during heavy bus traffic. PPS mapping must be unlocked before runtime remapping to avoid silent configuration lockouts in production firmware, and the LF 1.8 V minimum supply requires care to keep regulated rails within tolerance during peak CPU bursts.
This page synthesizes distributor pricing, drop-in same-family variants, and practical design guidance not found in the standalone Microchip datasheet, helping engineers select between the LF and F suffix variants, choose the correct QFN vs SPDIP footprint, and validate timing margins for full-speed USB enumeration.
直接替换替代料： PIC18LF24K50-E/ML ——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： PIC18LF24K50-E/ML （相同外形与封装尺寸） ——差异在于 Package, I/O Pins, Timers, Core Architecture, ADC.
快速对比工具——选择替代料号进行并排对比：
PIC18LF24K50-I/ML
✅ 直接替换✓ 有现货
$1.58 / 个
查看数据手册 →PIC18LF24K50T-I/ML
✅ 直接替换✓ 有现货
$1.65 / 个
查看数据手册 →PIC18F24K50-I/ML
✅ 直接替换✓ 有现货
$1.95 / 个
查看数据手册 →PIC18LF24K40-I/ML
✅ 直接替换✓ 有现货
$1.65 / 个
查看数据手册 →PIC18LF23K22-I/ML
✅ 直接替换✓ 有现货
$2.2 / 个
查看数据手册 →PIC18F25K50-I/ML
✅ 直接替换✓ 有现货
$2.65 / 个
查看数据手册 →PIC18LF24K50-E/ML 最大额定值与电气特性
| Core Architecture | PIC18 8-bit RISC (Harvard) |
| Instruction Set Width | 16-bit (modified Harvard) |
| Max CPU Frequency | 48 MHz |
| Throughput | 16 MIPS |
| Flash Program Memory | 16 KB (8K x 16) |
| SRAM Data Memory | 2 KB |
| EEPROM | 256 B |
| Supply Voltage Range (Vdd) | 1.8 V to 3.6 V (LF variant) |
| I/O Pins | 25 |
| Integrated USB | USB 2.0 Full-Speed, on-chip transceiver, no external crystal required |
| ADC | 10-bit, up to 14 channels |
| Comparators | 2 analog comparators |
| Timers | 3 (Timer0/Timer1/Timer2 families) |
| EUSART / MSSP | 1 x EUSART, 2 x MSSP (SPI / I2C master/slave) |
| Special Modules | CTMU, PPS, CLC, ECCP, NUM |
| Low-Power Technology | nanoWatt XLP |
| 工作温度 | -40C to +125C (E grade) |
| 封装 | 28-QFN (ML), 6x6 mm |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (ROHS3) |
| Source/Sink per I/O | 25 mA source / sink; 75 mA high-current capable |
PIC18LF24K50-E/ML 引脚配置
| 引脚 1 | RA2 — PORTA bit 2, analog-capable I/O |
| 引脚 2 | RA3 — PORTA bit 3, analog-capable I/O |
| 引脚 3 | RA4 — PORTA bit 4, analog-capable I/O |
| 引脚 4 | RA5 — PORTA bit 5, analog-capable I/O |
| 引脚 5 | Vss — Ground |
| 引脚 6 | RA7 — PORTA bit 7, analog-capable I/O |
| 引脚 7 | RA6 — PORTA bit 6, oscillator I/O |
| 引脚 8 | RC0 — PORTC bit 0, analog-capable I/O |
| 引脚 9 | RC1 — PORTC bit 1, analog-capable I/O |
| 引脚 10 | RC2 — PORTC bit 2, analog-capable I/O |
| 引脚 11 | Vdd — Positive supply |
| 引脚 12 | RC4 — PORTC bit 4, USB D- |
| 引脚 13 | RC5 — PORTC bit 5, USB D+ |
| 引脚 14 | RB4 — PORTB bit 4, analog-capable I/O |
| 引脚 15 | RB5 — PORTB bit 5, analog-capable I/O |
| 引脚 16 | RB6 — PORTB bit 6, ICSCLK |
| 引脚 17 | RB7 — PORTB bit 7, ICSDAT |
| 引脚 18 | Vusb — USB internal 3.3 V regulator output (bypass) |
| 引脚 19 | Vdd — Positive supply |
| 引脚 20 | MCLR/RESET — Master clear reset input, active low |
| 引脚 21 | RB0 — PORTB bit 0, analog-capable I/O |
| 引脚 22 | RB1 — PORTB bit 1, analog-capable I/O |
| 引脚 23 | RB2 — PORTB bit 2, analog-capable I/O |
| 引脚 24 | RB3 — PORTB bit 3, analog-capable I/O |
| 引脚 25 | RC6 — PORTC bit 6, analog-capable I/O |
| 引脚 26 | RC7 — PORTC bit 7, analog-capable I/O |
| 引脚 27 | Vss — Ground |
| 引脚 28 | RC3 — PORTC bit 3, analog-capable I/O |
典型应用
PIC18LF24K50-E/ML 适用于 6 应用s: USB HID Peripherals, USB-to-UART Bridge, Battery-Powered Sensor Hubs, Low-Cost Data Loggers, Touch-Sensing Interface (mTouch / CTMU), Industrial Control Nodes.
USB HID Peripherals
The PIC18LF24K50-E/ML is well-matched to USB HID peripherals such as keyboards, mice, custom controllers, and gamepad interfaces because its integrated full-speed USB transceiver with on-chip pull-ups eliminates the external PHY and reduces BOM cost by roughly USD 0.40 per board. The PIC18 8-bit core running 16 MIPS, the 2 KB SRAM, and the 16 KB Flash comfortably handle HID report descriptors, debounce, and low-latency responses. The nanoWatt XLP modes keep standby current under 100 nA, so bus-powered devices meet USB suspend budget, and the LF 1.8 V to 3.6 V supply simplifies direct Li-ion / coin-cell designs.
推荐
USB-to-UART Bridge
Used as a USB-to-UART bridge, the PIC18LF24K50-E/ML maps the CDC class transparently because the integrated USB full-speed SIE and the on-chip EUSART cooperate via DMA-light polled throughput with effective line speeds up to 921,600 baud. The 25 I/O pins allow additional GPIOs for RS-485 direction control or RTS/CTS handshaking, and the PPS (Peripheral Pin Select) module lets designers remap UART and USB onto convenient PCB traces without rewiring the package. Designers can shrink the bridge to 8 mm x 8 mm using the 28-QFN while retaining all ESD-relevant IO protection inside the die.
推荐
Battery-Powered Sensor Hubs
The PIC18LF24K50-E/ML suits battery-powered sensor hubs because the LF process and nanoWatt XLP modes drive sleep current below 100 nA typical, enabling coin-cell lifetimes of 1 to 3 years for slow-data sensors transmitting hourly. The 10-bit ADC with up to 14 channels multiplexes thermistor, voltage, and current sensors, while the CLC and ECCP modules let sensor-trigger-and-actuate loops run without the CPU and save MIPS budget for USB enumeration when a host attaches. The 1.8 V to 3.6 V supply range also supports direct Li-MnO2 primary cells without a boost regulator.
推荐
Low-Cost Data Loggers
As a low-cost data logger the PIC18LF24K50-E/ML benefits from 16 KB Flash for runtime ring buffers, 256 B EEPROM for non-volatile parameter storage, and the CTMU module for precise time-of-flight or temperature timestamping on each log entry. With PPS remapping the I2C and SPI MSSP ports connect to microSD cards or external FRAM while keeping GPIO usage compact. USB enumeration allows the logged file to be pulled to a host without removing the card, and the LF 1.8 V supply supports low-voltage cutoff that protects Li-ion cells from over-discharge.
推荐
Touch-Sensing Interface (mTouch / CTMU)
For capacitive touch interfaces, the PIC18LF24K50-E/ML integrates the CTMU module that performs charge-time measurement across multiple I/O pins and the mTouch libraries that Microchip provides reference firmware for. Charge transfer resolution scales with the 1.8 V to 3.6 V rail and the XLP sleep modes let the device wake only on proximity, ideal for kitchen appliances and white goods. The PPS-mappable comparators and CLCs filter debounce entirely in hardware, freeing the CPU entirely for back-channel USB events, and the 28-QFN lands cleanly behind glass touch panels.
推荐
Industrial Control Nodes
In industrial control nodes the PIC18LF24K50-E/ML provides USB for configuration and diagnostics alongside UART/I2C field-bus connectivity, and the E-grade -40C to +125C rating supports outdoor and motor-cabinet environments. The CLC and ECCP blocks implement custom PWM and waveform logic autonomously, while NUM (Numerically Controlled Oscillator) avoids external resonator cost. Active system current remains under 5 mA typical at 48 MHz with USB idle, enabling loop-powered 4-20 mA node designs with USB service-port extension.
推荐
推荐产品汇总
工程参考数据： PIC18LF24K50-E/ML ——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 | PIC18LF24K50-I/ML | PIC18LF24K50T-I/ML | PIC18F24K50-I/ML | PIC18LF24K40-I/ML | PIC18LF23K22-I/ML | PIC18F25K50-I/ML |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-QFN (ML), 6x6 mm | 28-QFN (ML) - same | 28-QFN (ML) - same | 28-QFN (ML) - same | 28-QFN (ML) - same | 28-QFN (ML) - same | 28-QFN (ML) - same |
| Flash | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 8 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 1 KB | 2 KB |
| Supply Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 2.7 V to 5.5 V | 1.8 V to 3.3 V | 1.8 V to 5.5 V | 2.7 V to 5.5 V |
| Integrated USB | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | No USB | No USB | USB 2.0 Full-Speed |
| Temperature Grade | -40C to +125C (E) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) |
关键差异点
- Industrial-grade wide temperature range (-40C to +125C) （对比 PIC18LF24K50-I/ML)
- Integrated full-speed USB with on-chip 3.3 V regulator （对比 PIC18LF23K22-I/ML)
- Lower-voltage 1.8 V minimum Vdd (LF variant) （对比 PIC18F24K50-I/ML)
设计说明
Estimated: For 28-QFN USB designs the Vusb pin requires a 0.1 uF X7R ceramic bypass capacitor within 3 mm of the pin, and the exposed thermal pad must be soldered to a 4 mm x 4 mm minimum ground copper pour for thermal and signal return integrity. The D+/D- traces must be 90 ohm differential, kept matched to under 1 mm skew; use the Microchip AN1169 layout guide as a baseline. Place the MCU crystal or resonator within 5 mm of OSC1/OSC2 when an external oscillator is used.
Estimated: When using USB bus power on a 5 V Vbus that may drop to 4.4 V during enumeration, the LF 1.8 V to 3.6 V supply requires a regulator capable of 3.3 V output at full MCU load (about 15 mA active, 6 mA idle). The internal 3.3 V regulator on Vusb cannot drive the MCU Vdd rail above its own rating; route a separate regulator with bypass capacitors sized for 50 mA peak bursts. Add a 4.7 uF bulk cap near Vdd for USB suspend transitions.
Estimated: A common mistake is forgetting to unlock Peripheral Pin Select (PPS) registers before remapping EUSART, MSSP, or comparator outputs at runtime; the unlock sequence must be executed before writing PPS registers, or the write is silently ignored and the firmware appears to hang during USB enumeration. Also note the PIC18LF24K50-E temperature grade is -40C to +125C for E grade vs -40C to +85C for the I grade; do not assume I-grade units operate at 125C without screening.
合规信息
RoHS3 compliant per Microchip product page and ics-embedded cross-reference listing. AEC-Q100 is not qualified as this is an industrial MCU. MSL and halogen-free status were not in the provided data.
