PIC18LC801-I/L - 8-bit 25MHz ROMless MCU 84-PLCC | Microchip
MPN: PIC18LC801-I/L ✓ فعالPIC18LC801-I/L نمای کلی
An 8-bit ROMless microcontroller is a variant of the broader microcontroller (MCU) category in which the on-chip program memory is intentionally omitted. Code is stored externally (typically in parallel EPROM, flash, or EEPROM) and fetched by the MCU through an external memory bus. ROMless MCUs sit within the hierarchy: microcontroller -> embedded processor -> semiconductor. This variant is preferred during prototyping, low-volume production, and field-upgradable firmware designs where code must be changeable without replacing the MCU.
Key features of the PIC18LC801-I/L include the Harvard architecture with separate program and data buses, a wide operating voltage range suited to 3V designs (low-power "LC" variant), 37 I/O pins for peripheral interfacing, multiple communication peripherals, and an external oscillator input. The ROMless interface allows designers to choose program memory density and technology based on cost and longevity targets.
The PIC18LC801-I/L leverages Microchip's enhanced PIC18 instruction set, which provides hardware multiply, hardware divide, and a 16-bit wide program path while keeping the core 8-bit for arithmetic. The 84-pin J-Lead PLCC footprint allows socketed prototyping, which is especially valuable during firmware development when frequent device swaps are needed. Industrial-grade temperature operation supports commercial and industrial control deployments.
Typical applications include industrial control systems, motor control front-ends, communications adapters, prototype development platforms, and embedded systems where external boot memory is acceptable. Designers transitioning to higher-density applications may migrate to flash-equipped PIC18F parts with the same pinout. A 25 MHz clock and 37 I/O lines suit designs requiring moderate computational throughput and a moderate peripheral count.
جایگزین‌های drop-in برای PIC18LC801-I/L — 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 PIC18LC801-I/L (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Mounting Type, Operating Temperature, Package, Number of I/O Pins, Program Memory Type.
PIC18C801-I/L
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18LC801-I/PT
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC18LC801-I/L حداکثر مقادیر مجاز و مشخصات الکتریکی
| Core Architecture | PIC 8-bit (PIC18) |
| Program Memory Type | ROMless (external memory bus) |
| Program Memory Size | 0 KB (external) |
| RAM Size | 1.5 KB (1.5K x 8) |
| حداکثر فرکانس کلاک | 25 MHz |
| Number of I/O Pins | 37 |
| بسته‌بندی | 84-PLCC (J-Lead), 84-LCC |
| عرض گذرگاه داده | 8 bit |
| Instruction Set Width | 16 bit |
| Oscillator Type | External |
| Operating Temperature Grade | Industrial (-40C to +85C) |
| نوع نصب | Surface Mount |
| Packaging | Tube |
| وضعیت RoHS | Compliant |
| Lead-Free | Yes |
پیکربندی پین PIC18LC801-I/L
| پین 1 | OSC1 — External oscillator input |
| پین 2 | OSC2 — External oscillator output |
| پین 3 | MCLR — Master Clear reset input |
| پین 4 | VSS — Ground reference |
| پین 5 | VDD — Positive supply voltage |
| پین 6 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| پین 7 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| پین 8 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| پین 9 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / voltage reference plus |
| پین 10 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| پین 11 | RA5/AN4 — PORTA bit 5 / analog input 4 |
| پین 12 | VSS — Ground reference |
| پین 13 | VDD — Positive supply voltage |
| پین 14 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| پین 15 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| پین 16 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| پین 17 | RB3 — PORTB bit 3 |
| پین 18 | RB4 — PORTB bit 4 |
| پین 19 | RB5 — PORTB bit 5 |
| پین 20 | RB6/PGC — PORTB bit 6 / ICSP clock |
| پین 21 | RB7/PGD — PORTB bit 7 / ICSP data |
| پین 22 | VSS — Ground reference |
| پین 23 | VDD — Positive supply voltage |
| پین 24 | RC0 — PORTC bit 0 |
| پین 25 | RC1 — PORTC bit 1 |
| پین 26 | RC2 — PORTC bit 2 |
| پین 27 | RC3 — PORTC bit 3 |
| پین 28 | RC4 — PORTC bit 4 |
| پین 29 | RC5 — PORTC bit 5 |
| پین 30 | RC6/TX — PORTC bit 6 / USART transmit |
| پین 31 | RC7/RX — PORTC bit 7 / USART receive |
| پین 32 | VSS — Ground reference |
| پین 33 | VDD — Positive supply voltage |
| پین 34 | RD0 — PORTD bit 0 / external memory data bit 0 |
| پین 35 | RD1 — PORTD bit 1 / external memory data bit 1 |
| پین 36 | RD2 — PORTD bit 2 / external memory data bit 2 |
| پین 37 | RD3 — PORTD bit 3 / external memory data bit 3 |
| پین 38 | RD4 — PORTD bit 4 / external memory data bit 4 |
| پین 39 | RD5 — PORTD bit 5 / external memory data bit 5 |
| پین 40 | RD6 — PORTD bit 6 / external memory data bit 6 |
| پین 41 | RD7 — PORTD bit 7 / external memory data bit 7 |
| پین 42 | VSS — Ground reference |
| پین 43 | VDD — Positive supply voltage |
| پین 44 | RE0/RD — PORTE bit 0 / external memory read strobe |
| پین 45 | RE1/WR — PORTE bit 1 / external memory write strobe |
| پین 46 | RE2/CS — PORTE bit 2 / external memory chip select |
| پین 47 | VSS — Ground reference |
| پین 48 | VDD — Positive supply voltage |
| پین 49 | RF0 — PORTF bit 0 |
| پین 50 | RF1 — PORTF bit 1 |
| پین 51 | RF2 — PORTF bit 2 |
| پین 52 | RF3 — PORTF bit 3 |
| پین 53 | RF4 — PORTF bit 4 |
| پین 54 | RF5 — PORTF bit 5 |
| پین 55 | RF6 — PORTF bit 6 |
| پین 56 | RF7 — PORTF bit 7 |
| پین 57 | VSS — Ground reference |
| پین 58 | VDD — Positive supply voltage |
| پین 59 | RG0 — PORTG bit 0 |
| پین 60 | RG1 — PORTG bit 1 |
| پین 61 | RG2 — PORTG bit 2 |
| پین 62 | RG3 — PORTG bit 3 |
| پین 63 | RG4 — PORTG bit 4 |
| پین 64 | AVSS — Analog ground reference |
| پین 65 | AVDD — Analog positive supply |
| پین 66 | RH0 — PORTH bit 0 / external memory address bit 0 |
| پین 67 | RH1 — PORTH bit 1 / external memory address bit 1 |
| پین 68 | RH2 — PORTH bit 2 / external memory address bit 2 |
| پین 69 | RH3 — PORTH bit 3 / external memory address bit 3 |
| پین 70 | VSS — Ground reference |
| پین 71 | VDD — Positive supply voltage |
| پین 72 | RJ0 — PORTJ bit 0 / external memory address bit 8 |
| پین 73 | RJ1 — PORTJ bit 1 / external memory address bit 9 |
| پین 74 | RJ2 — PORTJ bit 2 / external memory address bit 10 |
| پین 75 | RJ3 — PORTJ bit 3 / external memory address bit 11 |
| پین 76 | RJ4 — PORTJ bit 4 / external memory address bit 12 |
| پین 77 | RJ5 — PORTJ bit 5 / external memory address bit 13 |
| پین 78 | RJ6 — PORTJ bit 6 / external memory address bit 14 |
| پین 79 | RJ7 — PORTJ bit 7 / external memory address bit 15 |
| پین 80 | VSS — Ground reference |
| پین 81 | VDD — Positive supply voltage |
| پین 82 | RK0 — PORTK bit 0 / external memory address bit 16 |
| پین 83 | RK1 — PORTK bit 1 / external memory address bit 17 |
| پین 84 | NC — Not connected (per datasheet) |
کاربردهای معمول
PIC18LC801-I/L مناسب است برای 6 کاربردs: Industrial Control Systems, Prototype Development Platform, Motor Control Front-End, Communications Adapter, External Memory Embedded System, Test and Measurement Equipment.
Industrial Control Systems
The PIC18LC801-I/L fits industrial control applications where external program memory and 37 I/O pins suit moderate-complexity PLC front-ends, sensor aggregation nodes, and motor-control interfaces. The 25 MHz clock delivers up to 6.25 MIPS, sufficient for PID loops, encoder decoding, and Modbus RTU message processing. The 84-pin PLCC package supports socketed field service - field technicians can swap the MCU without reworking the board. According to Microchip's PIC18 family datasheet, the industrial temperature range (-40C to +85C) is rated for factory floor conditions. The 1.5 KB on-chip RAM is adequate for stack and data buffering when code runs from external memory.
پیشنهادی
Prototype Development Platform
The PIC18LC801-I/L's ROMless architecture makes it ideal for prototype platforms where firmware is iterated rapidly. Code is loaded into external EPROM or flash, allowing firmware updates without replacing the MCU - a major benefit during bring-up, debugging, and customer evaluation. The 84-pin PLCC package supports socketed mounting, so engineers can swap MCUs during development. According to Microchip's PIC18LC801 datasheet, the external memory bus interface is documented for standard parallel memory devices, allowing prototype boards to use commodity EPROMs. The 25 MHz clock supports near-real-time emulation of the eventual flash-equipped production target.
پیشنهادی
Motor Control Front-End
The PIC18LC801-I/L suits motor control front-ends that require 37 I/O pins for Hall sensor inputs, PWM outputs, gate driver interfaces, and fault feedback. The 25 MHz instruction throughput supports real-time BLDC commutation loops and FOC algorithms at moderate RPM. The 84-pin PLCC package provides sufficient pins for three-phase inverter feedback plus communication. According to Microchip's PIC18 datasheet, the timer/counter modules support capture and compare modes suited to encoder feedback and PWM generation. The LC low-voltage variant is appropriate for 3V battery-powered motor control boards.
پیشنهادی
Communications Adapter
The PIC18LC801-I/L fits communications adapters that bridge UART, SPI, or I2C peripherals to higher-bandwidth external memory for protocol buffering. The ROMless architecture allows the protocol stack to reside in external memory, easing stack updates without changing the MCU. The 25 MHz clock delivers sufficient throughput for UART speeds up to 1.5 Mbaud and SPI up to 12.5 MHz. According to the PIC18LC801 datasheet, the USART and MSSP peripherals support the standard serial protocols needed for adapter designs. The 84-pin PLCC allows socketed prototyping during protocol bring-up.
پیشنهادی
External Memory Embedded System
The PIC18LC801-I/L targets embedded systems that intentionally use external program storage to enable in-field firmware updates or to share firmware across multiple product variants. The external memory bus can address large code spaces that exceed on-chip flash capacities. According to Microchip's PIC18LC801 datasheet, the external memory interface is documented with timing diagrams and bus arbitration examples. The 84-pin PLCC package dedicates sufficient pins to the address/data bus while still leaving 37 pins for application use, making it suitable for code-heavy applications like protocol stacks and DSP filter libraries.
پیشنهادی
Test and Measurement Equipment
The PIC18LC801-I/L suits test and measurement front-ends where 37 I/O pins handle multiple sensor inputs, ADCs, and display interfaces, and where external program memory stores calibration tables and lookup data. The 25 MHz clock supports real-time data acquisition at moderate sample rates. According to Microchip's PIC18LC801 datasheet, the industrial temperature grade (-40C to +85C) supports laboratory and field environments. The ROMless architecture allows calibration firmware to be versioned via external memory swap, supporting metrology traceability across production batches.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای PIC18LC801-I/L — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | PIC18C801-I/L | PIC18LC801-I/PT |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 84-PLCC (J-Lead) | 84-PLCC (J-Lead) - same | 80-TQFP (12x12) - different |
| Core Architecture | PIC 8-bit (PIC18) | PIC 8-bit (PIC18) | PIC 8-bit (PIC18) |
| Max Clock Frequency | 25 MHz | 25 MHz | 25 MHz |
| Program Memory Type | ROMless (external bus) | ROMless (external bus) | ROMless (external bus) |
| RAM Size | 1.5 KB | 1.5 KB | 1.5 KB |
| Number of I/O Pins | 37 | 37 | 33 (TQFP variant) |
| Operating Voltage Family | Low-voltage (LC) | Standard (C) - 5V | Low-voltage (LC) |
| Temperature Grade | Industrial | Industrial | Industrial |
تفاوت‌های کلیدی
- Low-voltage variant supports 3V designs (در مقابلPIC18C801-I/L)
- 84-pin PLCC J-Lead package supports socketed mounting (در مقابلPIC18LC801-I/PT)
- ROMless architecture enables external firmware versioning (در مقابلPIC18F8720-I/PT)
یادداشت‌های طراحی
The PIC18LC801-I/L is a ROMless part - it requires external program memory on the parallel external memory bus. Designers must include the external EPROM/flash and bus arbitration logic in the schematic. According to Microchip's PIC18LC801 datasheet, the external bus timing diagrams must be observed for read/write cycles; failing to honor tACC and tCO will cause code fetch errors at 25 MHz.
The LC (low-voltage) variant operates at a lower Vdd range than the PIC18C801 standard variant. Designers must verify the Vdd rail matches the PIC18LC801 datasheet specification before substituting an LC for a C part. Insert a bulk decoupling capacitor (10 uF) near the Vdd pins and a 0.1 uF ceramic decoupling capacitor on each Vdd pin pair. The PIC18LC801 datasheet specifies the number and placement of Vdd/VSS pin pairs in the 84-PLCC package.
Route the external memory address, data, and strobe signals (RD, WR, CS) with matched trace lengths and a ground reference plane to maintain signal integrity at 25 MHz. According to Microchip's PIC18LC801 datasheet, the external memory bus AC characteristics define the maximum trace delay. Place the external memory device close to the MCU and use 4-layer PCB construction for clean bus signals.
اطلاعات انطباق
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C. Not AEC-Q100 qualified (consumer/industrial MCU, not automotive).
