PIC18LC442-I/PT - 8-bit MCU, 16KB Flash, 34 I/O | Microchip
MPN: PIC18LC442-I/PT ✗ پایان تولیدPIC18LC442-I/PT نمای کلی
An 8-bit microcontroller (MCU) is a programmable computing integrated circuit that combines a CPU, non-volatile program memory, working RAM, and a rich set of peripherals (timers, ADC, UART, I/O ports) on a single silicon die. PIC18C and PIC18F microcontrollers from Microchip use a Harvard RISC architecture with separate program and data buses, C-compiler-optimized instruction set, and source-code compatibility with the legacy PIC16C family. The 'LC' variant of PIC18 is specified for a lower supply-voltage range than the standard PIC18F, enabling battery-powered and 3.3 V-only designs where an LDO is preferred over a switching converter.
Key features of the PIC18LC442 include up to 10 MIPS execution throughput from a 40 MHz oscillator (or 10 MHz with the on-chip PLL), a 10-bit multi-channel Analog-to-Digital Converter (ADC), a single-cycle hardware 8x8 multiplier, two 8-bit and three 16-bit timers, two analog comparators, an I2C/SPI master/slave USART, and a priority-leveled interrupt controller. The 34 I/O pins drive LED indicators, keypads, sensors, and small displays in appliance- and industrial-control boards.
Architecturally, the PIC18LC442 uses Microchip's enhanced mid-range core with 16-bit-wide instructions and an 8-bit data path. Its 8-level hardware stack, indexed addressing modes, and multiply/divide hardware accelerate C-compiled code, which is unusual for 8-bit MCUs and makes it suitable for C development toolchains (MPLAB XC8). The on-chip ADC supports both analog and digital conversion, while the USART supports RS-232/RS-485 asynchronous communication plus SPI/I2C synchronous modes for sensor and EEPROM interfaces.
Typical applications include industrial-control front panels, appliance user interfaces, smart sensors, low-power handheld instruments, building automation nodes, and small motor-control boards where 5V-tolerant signal chains and ADC inputs coexist. The wide supply-voltage tolerance makes it appropriate for both 5V-regulated and battery-powered products.
When designing with the PIC18LC442, ensure the MCLR reset pin is correctly biased with the recommended pull-up resistor and that the decoupling capacitors are placed within a few millimeters of VDD/VSS pins. For new designs, evaluate the pin-compatible PIC18F442 first - it has wider supply tolerance and is typically more available than the LC variant.
This page synthesizes distributor pricing, package-level alternatives, and engineering guidance not bundled with the MIFARE datasheet PDF, providing context not found on DigiKey or Mouser alone.
جایگزین‌های drop-in برای PIC18LC442-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 PIC18LC442-I/PT (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Core Architecture, Package, Timers, Operating Temperature, ADC.
PIC18F442-I/PT
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC18F452-I/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18LF442-I/PT
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18F458-I/PT
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC18F46J11-I/PT
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC18LC442-I/PT حداکثر مقادیر مجاز و مشخصات الکتریکی
| Core Architecture | PIC18 8-bit RISC (Harvard) |
| Program Memory | 16 KB Flash |
| RAM | 512 bytes |
| EEPROM | 256 bytes |
| I/O Pins | 34 |
| ADC | 10-bit, 8 channels |
| Supply Voltage Range | 2.0 V to 5.5 V (LC variant) |
| حداکثر فرکانس کلاک | 40 MHz |
| Instruction Throughput | 10 MIPS |
| Timers | Two 8-bit + three 16-bit |
| Communication | USART (RS-232/RS-485), SPI, I2C |
| بسته‌بندی | TQFP-44 (PT) 10x10 mm |
| نوع نصب | Surface Mount |
| دمای کاری | -40C to +85C (Industrial) |
| Instruction Set Width | 16-bit instructions, 8-bit data |
پیکربندی پین PIC18LC442-I/PT
| پین 1 | MCLR — Master Clear (reset) input, internal pull-up |
| پین 2 | RA0/AN0 — Digital I/O / analog input channel 0 |
| پین 3 | RA1/AN1 — Digital I/O / analog input channel 1 |
| پین 4 | RA2/AN2/VREF- — Digital I/O / analog input channel 2 / negative voltage reference |
| پین 5 | RA3/AN3/VREF+ — Digital I/O / analog input channel 3 / positive voltage reference |
| پین 6 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| پین 7 | RA5/AN5 — Digital I/O / analog input channel 5 |
| پین 8 | VSS — Ground reference |
| پین 9 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| پین 10 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| پین 11 | RC0/T1CKI — Digital I/O / Timer1 clock input |
| پین 12 | RC1/CCP2 — Digital I/O / Capture/Compare/PWM channel 2 |
| پین 13 | RC2/CCP1 — Digital I/O / Capture/Compare/PWM channel 1 |
| پین 14 | RC3/SCK/SCL — Digital I/O / SPI clock / Serial clock |
| پین 15 | RC4/SDI/SDA — Digital I/O / SPI data in / Serial data |
| پین 16 | RC5/SDO — Digital I/O / SPI data out |
| پین 17 | RC6/TX/CK — Digital I/O / USART async transmit / sync clock |
| پین 18 | RC7/RX/DT — Digital I/O / USART async receive / sync data |
| پین 19 | VSS — Ground reference |
| پین 20 | VDD — Positive supply voltage |
| پین 21 | RB0/INT — Digital I/O / external interrupt |
| پین 22 | RB1 — Digital I/O |
| پین 23 | RB2 — Digital I/O |
| پین 24 | RB3 — Digital I/O |
| پین 25 | RB4 — Digital I/O / interrupt-on-change |
| پین 26 | RB5 — Digital I/O / interrupt-on-change |
| پین 27 | RB6/PGC — Digital I/O / ICSP clock / interrupt-on-change |
| پین 28 | RB7/PGD — Digital I/O / ICSP data / interrupt-on-change |
| پین 29 | VSS — Ground reference |
| پین 30 | VDD — Positive supply voltage |
| پین 31 | RD0/PSP0 — Digital I/O / parallel slave port bit 0 |
| پین 32 | RD1/PSP1 — Digital I/O / parallel slave port bit 1 |
| پین 33 | RD2/PSP2 — Digital I/O / parallel slave port bit 2 |
| پین 34 | RD3/PSP3 — Digital I/O / parallel slave port bit 3 |
| پین 35 | RC4/SDI/SDA — (Not present on 44-pin; placeholder) |
| پین 36 | RC5/SDO — (Not present on 44-pin; placeholder) |
| پین 37 | RC6/TX/CK — (Not present on 44-pin; placeholder) |
| پین 38 | RC7/RX/DT — (Not present on 44-pin; placeholder) |
| پین 39 | RD4/PSP4 — Digital I/O / parallel slave port bit 4 |
| پین 40 | RD5/PSP5 — Digital I/O / parallel slave port bit 5 |
| پین 41 | RD6/PSP6 — Digital I/O / parallel slave port bit 6 |
| پین 42 | RD7/PSP7 — Digital I/O / parallel slave port bit 7 |
| پین 43 | VSS — Ground reference |
| پین 44 | VDD — Positive supply voltage |
کاربردهای معمول
PIC18LC442-I/PT مناسب است برای 6 کاربردs: Industrial Control Front Panel, Smart Sensor Hub with ADC, Battery-Powered Handheld Instrument, Building Automation Node, Appliance User Interface Controller, Small Motor Control Board.
Industrial Control Front Panel
The PIC18LC442-I/PT is well suited to industrial control front-panel designs where its 34 digital I/O lines drive keypads, LED indicators, and 7-segment displays while the 10-bit ADC reads sensor inputs. The 10 MIPS throughput from a 40 MHz oscillator is sufficient to scan a 4x4 matrix keypad, debounce inputs, and update a multiplexed display within a single 10 ms refresh cycle. Its 2.0 V to 5.5 V supply range allows direct connection to 5 V or 3.3 V power rails typical in industrial enclosures. Pair it with the MCP23017 I/O expander or the ULN2003 driver array when more lines are needed.
پیشنهادی
Smart Sensor Hub with ADC
The PIC18LC442-I/PT's integrated 10-bit ADC with up to 8 input channels allows simultaneous sampling of analog sensors such as temperature, pressure, and light in compact sensor hubs. With 16 KB of Flash, the device can store calibration coefficients, linearization tables, and Modbus or I2C/SPI protocol stacks for sensor data transmission. The USART peripheral supports RS-485 half-duplex industrial networks, while the hardware multiplier accelerates digital filtering of sensor data. Pair with the MCP9700 thermistor or the MCP3421 18-bit delta-sigma ADC for higher precision.
پیشنهادی
Battery-Powered Handheld Instrument
The PIC18LC442-I/PT's 2.0 V to 5.5 V supply range makes it well matched to 2x AA or 3x AA battery packs without complex power-conditioning circuitry. The PIC18's nanoWatt technology offers multiple sleep modes that reduce quiescent current to microampere levels, extending battery life in data loggers and portable meters. The 10-bit ADC monitors battery voltage and sensor inputs while the USART streams logged data to a host. The 44-pin TQFP (PT) package is compact at 10x10 mm for handheld form factors. Pair with the MCP1700 LDO regulator and the MCP16252 boost converter for power management.
پیشنهادی
Building Automation Node
The PIC18LC442-I/PT is a strong fit for building-automation end nodes controlling lighting, blinds, and HVAC valves through relay or TRIAC outputs. Its 34 I/O lines handle multiple relay channels, status indicators, and wall-switch or thermostat inputs while the USART interfaces to BACnet or Modbus networks. The 16 KB Flash accommodates full communication stacks and timing logic. The industrial -40C to +85C temperature grade meets indoor and sheltered-outdoor environmental requirements. Pair with the MOC3021 optocoupler and the BTA16 TRIAC for mains switching.
پیشنهادی
Appliance User Interface Controller
The PIC18LC442-I/PT drives segmented LCD or LED displays, touch buttons, and encoder inputs in white-goods appliances such as washing machines, dishwashers, and microwave ovens. Its 16 KB Flash stores user-interface state machines, error codes, and diagnostic logs while the 10-bit ADC reads motor current, water level, and temperature sensors. The 34 I/O pins handle keypads, buzzer drivers, and indicator LEDs. The TQFP-44 package supports cost-effective SMT assembly lines. Pair with the ULN2003 driver and the MCP9700 temperature sensor.
پیشنهادی
Small Motor Control Board
The PIC18LC442-I/PT can drive small brushed DC motors, stepper motors, and brushless DC fans through PWM channels from its 16-bit timers. The 10 MIPS throughput executes PID control loops at kHz rates while the 10-bit ADC samples motor current via shunt resistors. The USART receives speed commands from a master controller and reports back telemetry. Industrial temperature grade supports motor enclosures. Pair with the DRV8871 motor driver and the ACS712 current sensor.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای PIC18LC442-I/PT — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | PIC18F442-I/PT | PIC18F452-I/PT | PIC18LF442-I/PT | PIC18F458-I/PT | PIC18F46J11-I/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-44 (PT) 10x10 mm | TQFP-44 (PT) 10x10 mm - same | TQFP-44 (PT) 10x10 mm - same | TQFP-44 (PT) 10x10 mm - same | TQFP-44 (PT) 10x10 mm - same | TQFP-44 (PT) 10x10 mm - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Lifecycle Status | NRND | Active | Active | Active | Active | Active |
| Program Memory | 16 KB Flash | 16 KB Flash | 32 KB Flash | 16 KB Flash | 32 KB Flash | 64 KB Flash |
| RAM | 512 bytes | 512 bytes | 1536 bytes | 512 bytes | 1536 bytes | 3806 bytes |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 1.8 V to 3.6 V | 2.0 V to 5.5 V | 2.0 V to 3.6 V |
| CAN Module | No | No | No | No | Yes (CAN 2.0B) | No |
| I/O Pins | 34 | 34 | 34 | 34 | 34 | 34 |
تفاوت‌های کلیدی
- Low-voltage 2.0-5.5V variant of PIC18 architecture (در مقابلPIC18F442-I/PT)
- Same 44-pin TQFP pinout across entire migration family (در مقابلPIC18F452-I/PT)
- Compact 10x10 mm TQFP-44 with 0.80 mm pitch (در مقابلPIC18F46J11-I/PT)
یادداشت‌های طراحی
Place a 100nF decoupling capacitor within 5 mm of each VDD pin (pins 11, 28, 40 on the TQFP-44) and a single 10 uF bulk capacitor near the MCU supply entry point. According to Microchip PIC18F/LF44X datasheet section 2.4, the device draws up to 16 mA at 5 V and 40 MHz, so the regulator must source at least 25 mA to handle transient ADC and I/O switching peaks.
Keep the MCLR pull-up resistor (typically 10 kOhm) within 25 mm of pin 1, and add a 100 nF cap to ground if longer trace runs are unavoidable. The ICSP programming pins PGC (pin 27) and PGD (pin 28) should be routed with short, length-matched traces and a 4.7 kOhm pull-up on MCLR during programming to ensure reliable in-circuit programming.
The PIC18LC442-I/PT is the LC low-voltage variant and is NRND - new designs should evaluate the PIC18F442-I/PT instead. Both share identical 44-pin TQFP pinout and 16 KB Flash architecture, so existing firmware compiled for the LC variant will run on the F variant with no code changes, though the LC has slightly different ADC reference voltage characteristics at low supply rails.
When using the 10-bit ADC with high-impedance analog inputs, add a 100 Ohm series resistor and 10 nF shunt cap to limit ADC sample-charge kickback. The internal acquisition time spec (TAD) requires the source impedance to be below 2.5 kOhm for full 10-bit accuracy. According to Microchip PIC18F/LF44X datasheet section 17, source impedances above 10 kOhm will degrade ADC linearity.
اطلاعات انطباق
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C. AEC-Q100 not applicable - this is a general-purpose MCU, not an automotive-qualified part.