PIC18F442T-I/L - 8-bit 40MHz 16KB Flash MCU 44-PLCC | Microchip
MPN: PIC18F442T-I/L ✓ Hoạt độngPIC18F442T-I/L Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, peripheral I/O, and timers on one die. The PIC18F family belongs to Microchip's 8-bit enhanced Harvard architecture tier, offering 16-bit opcodes, 31-level hardware stack, and 77 single-word instructions, sitting above the baseline PIC16 family in memory and peripheral sophistication. Within Microchip's broader portfolio it is categorized as a high-performance enhanced Flash MCU with nanoWatt power management, popular in industrial control, automotive body modules, and consumer white-goods designs.
Key features of the PIC18F442T-I/L include an integrated 10-bit ADC with up to 8 channels, a USART for serial communication, an MSSP module supporting SPI and I2C, capture/compare/PWM (CCP) modules, and 34 digital I/O lines. The 'T' suffix denotes tape-and-reel packaging, 'I' indicates the industrial -40C to +85C temperature range, and 'L' identifies the PLCC package. Operating voltage spans 4.2 V to 5.5 V from a single supply.
The architecture uses a separate instruction and data bus with a 25 ns instruction cycle at 40 MHz. This deterministic pipeline simplifies real-time control loops and avoids the fetch-decode bottleneck of von Neumann designs. The 8-bit datapath keeps code density high for bit-oriented and byte-oriented tasks.
Typical applications include industrial sensor interfaces, motor control front-ends, low-cost automotive body controllers, HVAC control boards, and consumer appliance mainboards. The wide operating voltage and strong peripheral set make it a frequent choice for upgrading older PIC16 designs needing more memory.
When designing with this MCU, observe the in-circuit serial programming (ICSP) voltage requirements and ensure decoupling is placed within 5 mm of the supply pins. The 5V-only range means it is not directly drop-in compatible with 3.3V-only systems without level translation. This page consolidates distributor pricing, drop-in alternatives, and practical design notes beyond the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC18F442T-I/L — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC18F442T-I/L (cùng hình factor và footprint) — khác nhau ở Mounting Type, Package, Program Memory (Flash), Timers, I/O Pins.
PIC18F442-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F452-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F458-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F252-I/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F442T-I/L Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC18F (8-bit enhanced Harvard) |
| Program Memory (Flash) | 16 KB (8K x 16 words) |
| Data Memory (SRAM) | 768 bytes |
| EEPROM | 256 bytes |
| Tần số xung maksimum | 40 MHz |
| Performance | 10 MIPS |
| Operating Voltage | 4.2 V to 5.5 V |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| I/O Pins | 34 / 36 (depending on datasheet revision) |
| ADC | 10-bit, up to 8 channels |
| Timers | 4 (Timer0/1/2/3) |
| Communication | USART, MSSP (SPI / I2C) |
| PWM / CCP | 2 CCP modules |
| Hộp | 44-pin PLCC (16.59 x 16.59 mm), J-Lead |
| Kiểu lắp đặt | Surface Mount |
| Instruction Set | 77 single-word instructions |
| Instruction Cycle | 100 ns at 40 MHz |
Cấu hình chân PIC18F442T-I/L
| Chân 1 | MCLR — Master Clear (reset) input, active low |
| Chân 2 | RA0/AN0 — PORTA bit 0 / analog input channel 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / analog input channel 1 |
| Chân 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input channel 2 / VREF- |
| Chân 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input channel 3 / VREF+ |
| Chân 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — PORTA bit 5 / analog input / SPI slave select |
| Chân 8 | RE0/RD — PORTE bit 0 / read control |
| Chân 9 | RE1/WR — PORTE bit 1 / write control |
| Chân 10 | RE2/CS — PORTE bit 2 / chip select |
| Chân 11 | VDD — Positive supply voltage |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKI — Oscillator input / external clock input |
| Chân 14 | OSC2/CLKO — Oscillator output / clock output |
| Chân 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock in |
| Chân 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| Chân 17 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| Chân 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 19 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 20 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 21 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Chân 22 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Chân 23 | RD0/PSP0 — PORTD bit 0 / parallel slave port data 0 |
| Chân 24 | RD1/PSP1 — PORTD bit 1 / parallel slave port data 1 |
| Chân 25 | RD2/PSP2 — PORTD bit 2 / parallel slave port data 2 |
| Chân 26 | RD3/PSP3 — PORTD bit 3 / parallel slave port data 3 |
| Chân 27 | RD4/PSP4 — PORTD bit 4 / parallel slave port data 4 |
| Chân 28 | RD5/PSP5 — PORTD bit 5 / parallel slave port data 5 |
| Chân 29 | RD6/PSP6 — PORTD bit 6 / parallel slave port data 6 |
| Chân 30 | RD7/PSP7 — PORTD bit 7 / parallel slave port data 7 |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive supply voltage |
| Chân 33 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Chân 34 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Chân 35 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Chân 36 | RB3/INT3 — PORTB bit 3 / external interrupt 3 |
| Chân 37 | RB4 — PORTB bit 4 (interrupt-on-change) |
| Chân 38 | RB5 — PORTB bit 5 (interrupt-on-change) |
| Chân 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC18F442T-I/L phù hợp cho 6 Áp dụngs: Industrial Sensor Interface Controller, Low-Cost Automotive Body Control, HVAC Control Board, Consumer Appliance Mainboard, Motor Control Front-End (Pre-Driver), Battery-Backed Sensor / Data Logger.
Industrial Sensor Interface Controller
The PIC18F442T-I/L suits industrial sensor interface boards where 16 KB of Flash accommodates multi-protocol driver stacks (Modbus RTU, HART-like, custom binary) and 768 bytes of SRAM handles small packet buffers. The 40 MHz / 10 MIPS core is fast enough for 10 ms acquisition loops reading 4-20 mA transducers via the 10-bit 8-channel ADC, with filter math executing in a single instruction cycle. Industrial -40C to +85C operation covers cabinet-mounted controls, and the 5V supply rails tolerate 24V industrial backplanes when paired with a small DC-DC brick. The USART and MSSP peripheral set supports both RS-485 transceiver links (via USART) and SPI-driven local DACs or EEPROM calibration memories.
Được đề xuất
Low-Cost Automotive Body Control
Automotive body controllers - seat modules, mirror controllers, and lighting nodes - commonly use PIC18F442T-I/L class MCUs because of their 5V-tolerant I/O, large output drive on PORTC/PORTD (25 mA per pin), and 34 I/O lines. The 256 bytes of EEPROM store trim and option-code settings across the vehicle lifetime. CCP modules generate the PWM needed for mirror positioning or LED dimming, while the USART talks to a body LIN master via a TJA1027 transceiver. Note that AEC-Q100 qualification requires the PIC18F442-I/PT automotive-grade variant rather than the standard industrial-grade part for OEM-supplier contracts.
Được đề xuất
HVAC Control Board
Residential and light-commercial HVAC control boards (thermostats, zone controllers) use PIC18F442T-I/L because the 10 MIPS performance handles PI control loops for damper actuators while the 16 KB Flash holds scheduling, occupancy, and Wi-Fi co-processor command stacks. The 10-bit ADC reads thermistor bridges for supply-air and return-air temperature; the 2 CCP modules drive TRIAC phase-control outputs for fan-speed regulation. nanoWatt sleep modes drop quiescent to under 1 uA between sensor reads, important for battery-backed thermostats. Industrial temperature range covers garage and attic installations.
Được đề xuất
Consumer Appliance Mainboard
White-goods and small appliance mainboards (washing machines, dishwashers, induction cooktops) are a classic fit for PIC18F442T-I/L because the 5V supply rail, 34 I/O, and 40 MHz throughput cover motor sequencing, button-matrix debouncing, and seven-segment display multiplexing in one chip. The MSSP port drives character LCDs via SPI or I2C, and the USART supports diagnostic UART to service tools. The 256-byte EEPROM retains wash-cycle preferences across power cycles, while flash endurance (100k erase/write cycles typical) tolerates firmware update workflows via ICSP during service.
Được đề xuất
Motor Control Front-End (Pre-Driver)
The PIC18F442T-I/L acts as a pre-driver controller for brushless DC (BLDC) or stepper motors in low-power applications. The 2 CCP modules plus Timer1/Timer3 generate the complementary PWM signals needed for a 3-phase inverter bridge, while the 40 MHz throughput executes a Field-Oriented Control (FOC) loop on a small motor up to about 1 kHz electrical frequency. The 10-bit ADC samples back-EMF or shunt-current feedback at modest resolution suitable for fans and pumps. For higher-current or higher-FOC-bandwidth designs, step up to dsPIC33 or PIC32MK, but for cost-bound fans and pumps the 18F442 is an effective pre-driver.
Được đề xuất
Battery-Backed Sensor / Data Logger
The PIC18F442T-I/L combined with nanoWatt technology and the 256-byte EEPROM fits low-power data loggers - cold-chain temperature loggers, remote weather stations, energy meters - where 16 KB Flash holds simple scheduling and averaging algorithms. The MSSP I2C port reads digital sensors (SHT30 humidity, MAX31855 thermocouple) and the internal EEPROM stores the logger's configuration. Sleep current under 1 uA extends coin-cell battery life to years. Real-time clock duties are handled by Timer1 with an external 32.768 kHz crystal, freeing the main oscillator for active measurement bursts.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F442T-I/L — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC18F442-I/L | PIC18F452-I/L | PIC18F458-I/L |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (L) | 44-PLCC (L) - same | 44-PLCC (L) - same | 44-PLCC (L) - same |
| Program Memory (Flash) | 16 KB | 16 KB (identical) | 32 KB (+100%) | 32 KB (+100%) |
| Data Memory (SRAM) | 768 B | 768 B (identical) | 1536 B (+100%) | 1536 B (+100%) |
| Maximum Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Operating Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| CAN Peripheral | No | No | No | Yes (CAN 2.0B) |
| Approx. Unit Price (qty 100) | USD 5.76 | USD 5.76 (same) | USD 6.40 | USD 7.10 |
Bảo phân biệt quan trọng
- 44-PLCC package with established 5V peripheral ecosystem (vsPIC18F45K22-I/P (DIP-40))
- Industrial temperature range with nanoWatt power management (vsPIC16F877A-I/P)
- 16 KB Flash with ICSP and self-programming (vsPIC18F242-I/SP (28-pin, 16 KB))
Ghi chú thiết kế
The PIC18F442T-I/L operates only at 4.2 V to 5.5 V. Use a low-dropout regulator such as MCP1700 or LM7805 to derive the 5 V rail from a 6-9 V input. Place 100 nF decoupling within 5 mm of every VDD/VSS pin pair (pins 11/12 and 31/32). Adding a 10 uF bulk capacitor near the IC handles inrush during FLASH programming via ICSP. The brown-out reset (BOR) module should be enabled in configuration bits to recover gracefully from supply droop during motor inrush events.
Route the ICSP signals (PGC on RB6, PGD on RB7, MCLR) so a 6-pin header can reach them on the final PCB without crossing other signal traces. Keep the 44-PLCC land pattern on a 1.6 mm or 2 mm board; PLCC sockets (e.g. 44-pin machined-pin) are available for easy field replacement. Keep the crystal load capacitors within 5 mm of OSC1 and OSC2. The 5V-only I/O is not directly 3.3V-compatible - if a 3.3V peripheral must connect, use a level translator such as TXS0108E rather than resistors.
Do not omit the MCLR pull-up resistor - floating MCLR causes random resets, especially during ICSP programming. Watch for inadvertent enables on the analog-select registers (PCFG bits in ADCON1) that would re-route a digital pin back to analog input. Always disable the watchdog timer (WDT) in configuration bits unless it is part of the design, or supply periodic CLRWDT instructions in long loops. Finally, when migrating code from PIC16 to PIC18F442, remember that the page and bank memory model differs - use the built-in table-read (TBLRD) for Flash access.
Thông tin tuân thủ
Standard industrial-grade part, not AEC-Q100 qualified - choose PIC18F442-I/PT automotive variant for AEC-Q100. RoHS/REACH compliance status not explicitly stated in the verified data; refer to Microchip product page or datasheet for current environmental compliance certifications.
