PIC18F442-E/P - 8-bit 16KB Flash MCU, 40MHz | Microchip
MPN: PIC18F442-E/P ✓ Hoạt độngPIC18F442-E/P Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip processor that integrates a CPU, program memory, data memory, I/O peripherals, and timers on a single silicon die, optimized for deterministic control of digital and analog signals in embedded systems. The PIC18F family is Microchip Technology's enhanced mid-range architecture, sitting in the taxonomy Microcontroller -> 8-bit MCU -> RISC MCU -> Flash MCU. It is upwards software-compatible with the PIC16C5X, PIC12CXXX, PIC16CXX and PIC17CXX devices, which provides a seamless migration path for code carried over from earlier designs.
Key differentiating features include nanoWatt power-management technology for low-power sleep modes, an integrated 10-bit Analog-to-Digital Converter (ADC) with 8 input channels, two Capture/Compare/PWM (CCP) modules, a synchronous serial port configurable as 3-wire SPI or 2-wire I2C, and 36 digital I/O pins shared across the 40-pin footprint. The device also offers self-programmability via the In-Circuit Debugger (ICD) interface and 256 bytes of non-volatile EEPROM for parameter storage.
Architecturally, the PIC18F442 uses an enhanced Harvard bus with separate program and data memories, a hardware multiplier, and an 8-bit data path feeding a 16-bit instruction word. The on-chip Flash supports self-programming so the same controller can update its firmware in the field. Compared with the original PIC18F442, the "-E" suffix denotes the extended temperature grade (-40C to +125C) which gives the part automotive and heavy-industrial reach beyond the standard 0C to +70C PIC18F442-I variant.
Typical applications include industrial sensor conditioning loops, motor control with PWM feedback, automotive body and chassis nodes, HVAC controllers, and white-goods user-interface panels. The extended temperature grade also makes the -E/P designation a common choice for any application that has to operate reliably outdoors or in a sealed enclosure.
When designing with this part, confirm that the 5V-only supply range (4.2-5.5V) suits your rail - it is not usable in modern 3.3V-only systems without an LDO upstream. Place a 100 nF decoupling capacitor on each VDD pin as close to the package as possible, and route MCLR with a 10 kohm pull-up and a 100 nF cap to ground for clean device-reset behaviour.
This page combines distributor pricing, drop-in PIC18 alternatives that share the 40-pin PDIP footprint, and design notes not bundled in the bare manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC18F442-E/P — 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 PIC18F442-E/P (cùng hình factor và footprint) — khác nhau ở Package, ADC, Operating Temperature, Timers, Mounting Type.
PIC18F4420-E/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F442-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4423-E/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F43K20-E/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4410-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F442-E/P Tỷ lệ tối đa & tính chất điện
| Product Type | 8-bit RISC Flash Microcontroller |
| Series | PIC18F |
| Program Memory (Flash) | 16 KB (8K x 16) |
| RAM | 768 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Instruction Cycle | 100 ns |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| I/O Pins | 34 (package); up to 36 |
| ADC | 10-bit, 8 channels |
| CCP/PWM Modules | 2 |
| Serial Interfaces | SPI / I2C (MSSP), USART |
| Timers | 4 (Timer0/1/2/3) |
| Hộp | 40-pin PDIP (0.600 in / 15.24 mm) |
| Temperature Grade | Extended (-40C to +125C) |
| Kiểu lắp đặt | Through-Hole (DIP) |
Cấu hình chân PIC18F442-E/P
| Chân 1 | MCLR — Master Clear (Reset) input |
| Chân 2 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Chân 3 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Chân 4 | RA2/AN2 — Digital I/O / Analog input channel 2 |
| Chân 5 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC Vref+ |
| Chân 6 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — Digital I/O / Analog input 4 / SPI slave select |
| Chân 8 | RE0/RD/AN5 — Port E bit 0 / Parallel slave port read / Analog input 5 |
| Chân 9 | RE1/WR/AN6 — Port E bit 1 / Parallel slave port write / Analog input 6 |
| Chân 10 | RE2/CS/AN7 — Port E bit 2 / Parallel slave port CS / Analog input 7 |
| Chân 11 | VDD — Positive supply voltage (4.2-5.5 V) |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKIN — Crystal oscillator input / external clock in |
| Chân 14 | OSC2/CLKOUT — Crystal oscillator output / clock out |
| Chân 15 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output |
| Chân 16 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 |
| Chân 17 | RC2/CCP1 — Port C bit 2 / CCP1 PWM output |
| Chân 18 | RC3/SCK/SCL — Port C bit 3 / SPI SCK / I2C SCL |
| Chân 19 | RD0/PSP0 — Port D bit 0 / Parallel slave port data bit |
| Chân 20 | RD1/PSP1 — Port D bit 1 / Parallel slave port data bit |
| Chân 21 | RD2/PSP2 — Port D bit 2 / Parallel slave port data bit |
| Chân 22 | RD3/PSP3 — Port D bit 3 / Parallel slave port data bit |
| Chân 23 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Chân 24 | RC5/SDO — Port C bit 5 / SPI data out |
| Chân 25 | RC6/TX/CK — Port C bit 6 / USART TX / clock |
| Chân 26 | RC7/RX/DT — Port C bit 7 / USART RX / data |
| Chân 27 | RD4/PSP4 — Port D bit 4 / Parallel slave port data bit |
| Chân 28 | RD5/PSP5 — Port D bit 5 / Parallel slave port data bit |
| Chân 29 | RD6/PSP6 — Port D bit 6 / Parallel slave port data bit |
| Chân 30 | RD7/PSP7 — Port D bit 7 / Parallel slave port data bit |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive supply voltage (4.2-5.5 V) |
| Chân 33 | RB0/INT0 — Port B bit 0 / External interrupt 0 |
| Chân 34 | RB1/INT1 — Port B bit 1 / External interrupt 1 |
| Chân 35 | RB2/INT2 — Port B bit 2 / External interrupt 2 |
| Chân 36 | RB3/CCP2 — Port B bit 3 / CCP2 (alternate) |
| Chân 37 | RB4 — Port B bit 4 |
| Chân 38 | RB5 — Port B bit 5 |
| Chân 39 | RB6/PGC — Port B bit 6 / ICD clock |
| Chân 40 | RB7/PGD — Port B bit 7 / ICD data |
Ứng dụng tiêu biểu
PIC18F442-E/P phù hợp cho 6 Áp dụngs: Industrial Sensor Conditioning, Automotive Body and Chassis Modules, HVAC and White-Goods Controllers, Motor Control PWM Front-Ends, Access Control and User-Interface Panels, Data Logging and Instrumentation.
Industrial Sensor Conditioning
The PIC18F442-E/P's 10-bit ADC with 8 input channels, 34 digital I/O lines, and 4.2-5.5 V supply make it a natural fit for industrial 4-20 mA sensor-conditioning boards. The 16 KB Flash holds the full linearization, PID and HMI host-protocol stacks without needing external memory, while two CCP modules generate precise excitation clocks for strain-gauge and RTD bridges. The -E temperature grade (-40C to +125C) lets the same board live in sealed panels mounted next to motors and contactors. Most conditioning loops run well below 40 MHz, so the part's 10 MIPS headroom means sub-millisecond scan times per channel.
Được đề xuất
Automotive Body and Chassis Modules
The PIC18F442-E/P's -40C to +125C extended temperature grade and 5 V supply tolerance map directly to automotive body and chassis nodes such as interior lighting controllers, seat-position modules, and HVAC blend-door actuators. Two CCP/PWM peripherals can drive a brush DC motor and read its back-EMF quadrature simultaneously, while the 8-channel 10-bit ADC samples up to 8 analog sensors (position, temperature, current) in a 200 us burst. The USART links the module to a CAN/LIN transceiver in the vehicle network, and the on-chip EEPROM (256 bytes) stores calibration constants between power cycles. Same-Package partners like the PIC18F4410-I/P extend longevity into newer vehicle programs.
Được đề xuất
HVAC and White-Goods Controllers
The PIC18F442-E/P powers HVAC wall thermostats and white-goods user-interface boards where 16 KB Flash comfortably holds the menu engine, the scheduling logic and the EEPROM-backed user profile. The MSSP peripheral handles the SPI bus to an LCD driver or 2-wire I2C bus to an EEPROM/RTC combo, while the USART often bridges to a Wi-Fi module. The device's ability to wake from sleep, do temperature conversions and go back to sleep lets the same controller support both the always-on backlight and battery-powered remote thermostats. The -E temp grade is critical for outdoor heat-pump controllers that sit in -20C winters and +80C roof-line summers.
Được đề xuất
Motor Control PWM Front-Ends
The PIC18F442-E/P's two CCP/PWM peripherals and 8 analog inputs support simple DC-motor and brushed-motor controllers, where the firmware implements a feedback loop reading current sense and driving direction/relay outputs. The 10 MIPS throughput gives 100 ns instruction cycle time, enough to execute a current-loop update every 50 us without overrunning the timer. The 256-byte EEPROM provides fault-log storage across brown-outs, and the extended temperature grade supports under-the-hood PMDC water-pump controllers used in heavy-equipment and E-bike auxiliary pumps. For vector-control or field-oriented-control, prefer a newer dsPIC33 partner instead.
Được đề xuất
Access Control and User-Interface Panels
Door-access controllers, keypad entry panels and industrial HMI screens pair naturally with the PIC18F442-E/P's 34 I/O lines, MSSP SPI/I2C and USART. The 16 KB Flash comfortably stores the keypad scanner, the 4-digit 7-segment driver, the Wiegand-card reader interface and an EEPROM-backed audit log. The -E temperature grade allows outdoor housings (gate keypads, parking arms, factory-floor keypads) without derating. The MSSP peripheral runs a 4-MHz SPI bus to a graphical OLED display, while the USART talks to an external Ethernet module for cloud-managed access lists.
Được đề xuất
Data Logging and Instrumentation
Portable test-and-measurement tools benefit from the PIC18F442-E/P's mix of on-chip peripherals, low cost and 40-pin PDIP easy-solder footprint. The 10-bit ADC, USART for an RS-485 link, and the 256-byte EEPROM let the controller sample, timestamp and store data while the user navigates menus. The 5V supply rail simplifies USB-powered tools where a 3.3 V regulator would not leave enough headroom for op-amp-based front-ends. The extended-temperature grade is critical for in-cabinet / outdoor temperature-logger use cases that face -20C to +70C swings without active cooling.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F442-E/P — 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 | PIC18F4420-E/P | PIC18F442-I/P | PIC18F4423-E/P | PIC18F43K20-E/PT | PIC18F4410-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-pin PDIP | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same |
| Program Memory (Flash) | 16 KB | 16 KB | 16 KB | 8 KB (-50%) | 8 KB (-50%) | 16 KB |
| Operating Voltage (VDD) | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V (wider) | 1.8 V to 3.6 V (lower) | 2.0 V to 5.5 V (wider) |
| Temperature Grade | Extended -40C to +125C | Extended -40C to +125C | Industrial -40C to +85C | Extended -40C to +125C | Extended -40C to +125C | Industrial -40C to +85C |
Bảo phân biệt quan trọng
- Extended -E temperature grade for automotive and outdoor industrial nodes (vsPIC18F442-I/P)
- Doubled RAM for richer firmware without changing footprint (vsPIC18F4420-E/P)
- Lower-voltage operation without losing the PIC18 instruction set (vsPIC18F4423-E/P)
Ghi chú thiết kế
The PIC18F442-E/P requires a single 4.2 V to 5.5 V rail; it will not operate on modern 3.3 V-only boards without adding an LDO (for example, MCP1700 or MCP1825) upstream. Place a 100 nF decoupling capacitor as close as possible to each VDD pin (pins 11 and 32) and a bulk 1-10 uF cap on the rail near the supply entry point. According to Microchip, average current in normal RUN mode is about 8 mA at 40 MHz / 5 V, so a small LDO at 250 mA is more than sufficient.
For the 40-pin PDIP footprint, route MCLR (pin 1) with a 10 kohm pull-up to VDD and a 100 nF cap to ground to give clean power-on reset behaviour and to keep the device out of programming mode after reset. Keep crystal traces (OSC1/OSC2) short and symmetric to ground, and add a guard ring around the crystal traces if the board also carries switching regulator or relay traces. According to the PIC18F datasheet, programming the configuration bits correctly is essential - a wrong FOSC setting is the most common reason PIC18F boards fail to come up at all.
Common pitfalls on PIC18F442-E/P designs include: (1) using 3.3 V only without an LDO, (2) leaving pins RA4 (open-drain) floating when used as I/O, (3) forgetting that RA3 doubles as VREF+ for ADC, (4) misconfiguring CCP2/PWM2 between RB3 and RC1 paths, (5) leaving unused I/O in input mode without a defined level (causes excess I_DD), and (6) accidentally enabling the parallel slave port (PSP) when DSP-style reads are not in use. According to Microchip, leaving unused I/O as outputs at logic-low is the recommended default for noise-immunity reasons.
Thông tin tuân thủ
RoHS compliant per Hotenda and Microchip product page (lead-free finish). The part is in the automotive -40C to +125C extended temperature grade, but is not specifically AEC-Q100 qualified - confirm automotive compliance with Microchip if your build requires formal certification.
