PIC18LF442-I/PT - 8-Bit 40MHz 16KB Flash MCU | Microchip | TQFP-44
MPN: PIC18LF442-I/PT ✓ فعالPIC18LF442-I/PT نمای کلی
What is a PIC18 microcontroller? The PIC18 family from Microchip is a high-performance 8-bit CMOS Flash MCU line using an enhanced RISC architecture with 77 single-word instructions and a hardware multiplier. PIC18 belongs to the broader category: microcontroller -> embedded MCU -> 8-bit MCU -> CMOS RISC processor -> semiconductor. These devices target applications requiring deterministic real-time control, low power, and easy reprogrammability in-circuit.
Key features of the PIC18LF442 include: 16 KB (8K x 16) self-programmable Flash program memory, 768 bytes of RAM, 256 bytes of EEPROM, 34 I/O pins with individually programmable pull-ups, four timer modules, a 10-bit ADC with up to 8 input channels, two analog comparators, an enhanced USART with autobaud detection, an MSSP module supporting SPI and I2C (master/slave), and a 10 MHz internal oscillator option alongside external crystal support up to 40 MHz.
The architecture provides 10 MIPS throughput, hardware stack, priority interrupts, and nanoWatt power management with multiple idle and sleep modes. The enhanced flash cell supports >100 k erase/write cycles and supports self-programming under firmware control, enabling bootloader and field-update scenarios.
Typical applications include industrial sensor interfaces, motor control peripherals, HVAC controllers, automotive body electronics (non-AEC-Q100), consumer appliance control boards, and USB-to-UART bridges when paired with a separate USB transceiver. The wide 2.0-5.5 V supply supports both 3.3 V and 5 V system rails.
When designing with this MCU, use a 0.1 uF decoupling capacitor per VDD pin placed within 5 mm, and ensure MCLR is tied through a 10 kohm pull-up to VDD for reliable reset. The ICD/ICSP programming pins (RB6/RB7) should not be heavily loaded during debug sessions to avoid programming failure.
This page synthesizes distributor pricing, same-family pin-compatible drop-in alternatives, and practical design notes not found in the bare manufacturer datasheet.
جایگزین‌های drop-in برای PIC18LF442-I/PT — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای PIC18LF442-I/PT (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Package, Timers, Core, ADC, Core Architecture.
PIC18LF452-I/PT
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18F442-I/PT
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشده📋 جایگزین مرجع (خارج از کاتالوگ)
PIC18LF4420-I/ML
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18LF4410-I/PT
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18LF4320-I/PT
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18LF442-I/PT حداکثر مقادیر مجاز و مشخصات الکتریکی
| Core Architecture | PIC18 (8-bit RISC, enhanced) |
| Instruction Set | 77 single-word instructions |
| Maximum Clock Speed | 40 MHz (10 MIPS) |
| Program Memory (Flash) | 16 KB (8K x 16 words) |
| Data RAM | 768 bytes |
| Data EEPROM | 256 bytes |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| Digital I/O Pins | 34 |
| ADC | 10-bit, up to 8 channels |
| Analog Comparators | 2 |
| Timers | 4 (Timer0/1/2/3) |
| Communication Interfaces | I2C, SPI, USART (with autobaud) |
| بسته‌بندی | 44-pin TQFP (10x10 mm) |
| دمای کاری | -40 C to +85 C (Industrial) |
| نوع نصب | Surface Mount |
| سطح MSL | 3 (168 hours) |
| وضعیت RoHS | Compliant |
| Lead-Free | Yes |
پیکربندی پین PIC18LF442-I/PT
| پین 1 | MCLRbar/VPP/RE3 — Master Clear (active-low reset) / programming voltage / digital I/O RE3 |
| پین 2 | RA0/AN0 — PORTA bit 0 / analog input channel 0 |
| پین 3 | RA1/AN1 — PORTA bit 1 / analog input channel 1 |
| پین 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input channel 2 / ADC negative reference |
| پین 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input channel 3 / ADC positive reference |
| پین 6 | RA4/T0CKI/C1OUT — PORTA bit 4 / Timer0 clock input / comparator 1 output |
| پین 7 | RA5/AN4/SSbar/C2OUT — PORTA bit 5 / analog input 4 / SPI slave select / comparator 2 output |
| پین 8 | RE0/RDbar/AN5 — PORTE bit 0 / parallel read control / analog input 5 |
| پین 9 | RE1/WRbar/AN6 — PORTE bit 1 / parallel write control / analog input 6 |
| پین 10 | RE2/CSbar/AN7 — PORTE bit 2 / parallel chip select / analog input 7 |
| پین 11 | VDD — Positive supply voltage |
| پین 12 | VSS — Ground |
| پین 13 | OSC1/CLKI/RA7 — Oscillator crystal input / external clock input / PORTA bit 7 |
| پین 14 | OSC2/CLKO/RA6 — Oscillator crystal output / clock output / PORTA bit 6 |
| پین 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| پین 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 module |
| پین 17 | RC2/CCP1 — PORTC bit 2 / CCP1 module (PWM/Capture/Compare) |
| پین 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| پین 19 | RD0/PSP0 — PORTD bit 0 / parallel slave port data bit 0 |
| پین 20 | RD1/PSP1 — PORTD bit 1 / parallel slave port data bit 1 |
| پین 21 | RD2/PSP2 — PORTD bit 2 / parallel slave port data bit 2 |
| پین 22 | RD3/PSP3 — PORTD bit 3 / parallel slave port data bit 3 |
| پین 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| پین 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| پین 25 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| پین 26 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| پین 27 | RD4/PSP4 — PORTD bit 4 / parallel slave port data bit 4 |
| پین 28 | RD5/PSP5 — PORTD bit 5 / parallel slave port data bit 5 |
| پین 29 | RD6/PSP6 — PORTD bit 6 / parallel slave port data bit 6 |
| پین 30 | RD7/PSP7 — PORTD bit 7 / parallel slave port data bit 7 |
| پین 31 | VSS — Ground |
| پین 32 | VDD — Positive supply voltage |
| پین 33 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| پین 34 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| پین 35 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| پین 36 | RB3/CCP2 — PORTB bit 3 / CCP2 module alternate pin |
| پین 37 | RB4 — PORTB bit 4 (interrupt-on-change) |
| پین 38 | RB5 — PORTB bit 5 (interrupt-on-change) |
| پین 39 | RB6/PGC — PORTB bit 6 / ICSP clock (programming/debug) |
| پین 40 | RB7/PGD — PORTB bit 7 / ICSP data (programming/debug) |
| پین 41 | AVSS — Analog ground |
| پین 42 | AVDD — Analog positive supply |
| پین 43 | VREF- — ADC negative reference (separate analog ground reference) |
| پین 44 | VREF+ — ADC positive reference (separate analog supply reference) |
کاربردهای معمول
PIC18LF442-I/PT مناسب است برای 6 کاربردs: Industrial Sensor Interface, HVAC Zone Controller, Consumer Appliance Control Board, Motor Control Peripherals, USB-to-UART Bridge, Smart Sensor Node with Bootloader.
Industrial Sensor Interface
The PIC18LF442-I/PT is well-suited for industrial sensor hub designs where multiple analog sensors need conditioning and digital read-out. Its 10-bit ADC with up to 8 input channels, 2.0 V to 5.5 V supply range, and 16 KB flash comfortably host sensor linearization, calibration tables, and Modbus RTU-style protocols over USART. The wide supply tolerance supports both 24 V-derived 5 V rails and direct 3.3 V Li-ion battery stacks. Compared to PIC16 alternatives, the 8 KB x 16 Flash word architecture yields faster execution of 16-bit arithmetic on transducer data.
پیشنهادی
HVAC Zone Controller
HVAC zoning boards benefit from the PIC18LF442-I/PT's blend of ADC channels, PWM timers, and USART for damper/valve actuation with thermostat connectivity. Four timer modules generate PWM for motorized damper control and triac firing, while 34 I/O lines interface with keypads, displays, and relays. The 2.0-5.5 V supply range lets a single MCU operate from 3.3 V (low-power standby) and 5 V (active driver) rails. NanoWatt sleep modes cut quiescent draw below 1 uA during standby, critical for wall-mounted thermostats.
پیشنهادی
Consumer Appliance Control Board
Appliance control boards (washing machines, dishwashers, microwave ovens) leverage the PIC18LF442-I/PT's deterministic interrupt response, 10 MIPS throughput, and robust peripheral mix. The PIC18 enhanced instruction set executes complex state machines for wash cycles in <1 ms tick times. The 16 KB flash holds multilingual UI strings, and 256-byte EEPROM stores user settings across power cycles. 34 I/O lines directly drive LEDs, keypads, triac interfaces, and motor enable lines without external muxing.
پیشنهادی
Motor Control Peripherals
Small brushless DC and stepper motor controllers in fans, pumps, and 3D printers pair well with the PIC18LF442-I/PT. Its four 16-bit timers with PWM and input-capture modes handle commutation timing and tachometer feedback, while the 10-bit ADC samples current shunt and back-EMF signals. The 10 MIPS core executes Field-Oriented Control loops within microseconds, supporting smooth torque delivery. The wide 2.0-5.5 V supply accepts 3.3 V logic-level gate drivers directly.
پیشنهادی
USB-to-UART Bridge
When paired with an external USB transceiver such as the MCP2200 or FT232, the PIC18LF442-I/PT serves as a compact USB-to-UART/I2C/SPI bridge for debug and field-update scenarios. The enhanced USART supports autobaud detection, simplifying firmware update flows. The 16 KB flash holds bootloader code plus the bridge firmware, while 768 bytes of RAM buffer CDC packets. The 2.0-5.5 V range supports both USB-bus-powered 5 V and battery-powered 3.3 V operation.
پیشنهادی
Smart Sensor Node with Bootloader
The PIC18LF442-I/PT's self-programmable Flash supports a robust bootloader for field firmware updates over I2C or UART, ideal for smart sensor nodes deployed across building automation or asset-tracking systems. The 16 KB flash partitions cleanly into bootloader + application regions, with the hardware write-protect feature guarding critical bootloader code. The 256-byte EEPROM stores configuration and calibration parameters across firmware upgrades without loss. The 2.0-5.5 V supply range supports battery-powered LoRaWAN-style sensor nodes.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای PIC18LF442-I/PT — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | PIC18LF452-I/PT | PIC18F442-I/PT | PIC18LF4420-I/ML | PIC18LF4410-I/PT | PIC18LF4320-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-44 (10x10) | TQFP-44 (10x10) - same | TQFP-44 (10x10) - same | TQFP-44 (10x10) - same | TQFP-44 (10x10) - same | TQFP-44 (10x10) - same |
| Core | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 enhanced 8-bit | PIC18 enhanced 8-bit | PIC18 enhanced 8-bit |
| Maximum Clock Speed | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| Program Memory (Flash) | 16 KB | 32 KB | 16 KB | 16 KB | 16 KB | 8 KB |
| Data RAM | 768 bytes | 1536 bytes | 768 bytes | 768 bytes | 768 bytes | 512 bytes |
| Supply Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Digital I/O Pins | 34 | 34 | 34 | 36 | 36 | 36 |
| ADC | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels |
| Communication Interfaces | I2C, SPI, USART | I2C, SPI, USART | I2C, SPI, USART | I2C, SPI, 2x USART | I2C, SPI, 2x USART | I2C, SPI, 2x USART |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Lifecycle Status | Active | Active | Active | Active | Active | Active |
تفاوت‌های کلیدی
- Wider supply voltage range than F-variant (در مقابلPIC18F442-I/PT)
- Drop-in upgrade path with double memory (در مقابلPIC18LF452-I/PT)
- Industrial-grade temperature and active lifecycle (در مقابلPIC18LF4320-I/PT)
- Enhanced peripheral integration in next-gen LF4420 (در مقابلPIC18LF4420-I/ML)
یادداشت‌های طراحی
Place a 0.1 uF decoupling capacitor on each VDD pin (pin 11 and pin 32) within 5 mm of the package, plus a bulk 10 uF tantalum or ceramic capacitor on the main VDD rail. For analog-sensitive designs, add a ferrite bead between AVDD and VDD to isolate digital switching noise from the analog reference. The PIC18LF442-I/PT's AVDD pin (pin 42) should be tied to the same supply as VDD if separate analog regulation is not used; if used separately, AVDD must come up no later than VDD to avoid latch-up via internal ESD clamps.
Route the ICSP pins RB6/PGC (pin 39) and RB7/PGD (pin 40) directly to a 6-pin ICSP header with no series resistors or buffer stages; load capacitance >30 pF on these lines causes programming failures with the PICkit 3. Keep the trace lengths under 50 mm and avoid routing them near high-frequency switching signals. For production programming, use a Tag-Connect TC2030 footprint to save board space.
When using the ADC, ensure AVDD has at least 10 uF of bulk capacitance with a 0.1 uF ceramic bypass close to pin 42, and tie AVSS (pin 41) directly to the ground plane with a short trace. The ADC's VREF+ input (pin 44) draws dynamic current during conversions; if using internal VREF, add a 0.1 uF ceramic cap on this pin. For multi-channel scanning above 50 kSPS, use sequential (not simultaneous) sampling and add 1 uF on each analog input pin through a low-impedance mux path.
Do not leave MCLRbar floating. Tie MCLRbar (pin 1) to VDD through a 10 kohm pull-up resistor, and add a 100 nF cap to ground for noise filtering. Floating MCLRbar causes random resets in noisy environments. Also note that RE3 (also on pin 1) is input-only - it cannot be driven as output. Configuration bits must be set to disable Low-Voltage Programming (LVP) unless pin 1 (RB5/PGM) is dedicated for that purpose, otherwise random LVP entry can occur during power-up brown-out events.
Keep the 40 MHz crystal (or resonator) within 10 mm of pins 13 (OSC1) and 14 (OSC2), with the load capacitors placed close to the crystal. Use a ground guard ring around the crystal traces to prevent injection of digital switching noise. If using the internal oscillator, the HF-INTOSC is factory calibrated to within +/- 1% across the full temperature range and 2.0-5.5 V supply, sufficient for USART autobaud at 9600 baud and below.
اطلاعات انطباق
RoHS compliant per Microchip product page. Industrial -40 C to +85 C temperature range. Not AEC-Q100 qualified - for automotive applications choose PIC18F automotive variants.