PIC18LC801-I/L - 8-bit 25MHz ROMless MCU 84-PLCC | Microchip
MPN: PIC18LC801-I/L ✓ Hoạt độngPIC18LC801-I/L Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho PIC18LC801-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 PIC18LC801-I/L (cùng hình factor và footprint) — khác nhau ở Mounting Type, Operating Temperature, Package, Number of I/O Pins, Program Memory Type.
PIC18C801-I/L
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PIC18LC801-I/L Tỷ lệ tối đa & tính chất điện
| 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) |
| Tần số xung maksimum | 25 MHz |
| Number of I/O Pins | 37 |
| Hộp | 84-PLCC (J-Lead), 84-LCC |
| Bề rộng đường dữ liệu | 8 bit |
| Instruction Set Width | 16 bit |
| Oscillator Type | External |
| Operating Temperature Grade | Industrial (-40C to +85C) |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tube |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân PIC18LC801-I/L
| Chân 1 | OSC1 — External oscillator input |
| Chân 2 | OSC2 — External oscillator output |
| Chân 3 | MCLR — Master Clear reset input |
| Chân 4 | VSS — Ground reference |
| Chân 5 | VDD — Positive supply voltage |
| Chân 6 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Chân 7 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Chân 8 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| Chân 9 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / voltage reference plus |
| Chân 10 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 11 | RA5/AN4 — PORTA bit 5 / analog input 4 |
| Chân 12 | VSS — Ground reference |
| Chân 13 | VDD — Positive supply voltage |
| Chân 14 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Chân 15 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Chân 16 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Chân 17 | RB3 — PORTB bit 3 |
| Chân 18 | RB4 — PORTB bit 4 |
| Chân 19 | RB5 — PORTB bit 5 |
| Chân 20 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 21 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 22 | VSS — Ground reference |
| Chân 23 | VDD — Positive supply voltage |
| Chân 24 | RC0 — PORTC bit 0 |
| Chân 25 | RC1 — PORTC bit 1 |
| Chân 26 | RC2 — PORTC bit 2 |
| Chân 27 | RC3 — PORTC bit 3 |
| Chân 28 | RC4 — PORTC bit 4 |
| Chân 29 | RC5 — PORTC bit 5 |
| Chân 30 | RC6/TX — PORTC bit 6 / USART transmit |
| Chân 31 | RC7/RX — PORTC bit 7 / USART receive |
| Chân 32 | VSS — Ground reference |
| Chân 33 | VDD — Positive supply voltage |
| Chân 34 | RD0 — PORTD bit 0 / external memory data bit 0 |
| Chân 35 | RD1 — PORTD bit 1 / external memory data bit 1 |
| Chân 36 | RD2 — PORTD bit 2 / external memory data bit 2 |
| Chân 37 | RD3 — PORTD bit 3 / external memory data bit 3 |
| Chân 38 | RD4 — PORTD bit 4 / external memory data bit 4 |
| Chân 39 | RD5 — PORTD bit 5 / external memory data bit 5 |
| Chân 40 | RD6 — PORTD bit 6 / external memory data bit 6 |
| Chân 41 | RD7 — PORTD bit 7 / external memory data bit 7 |
| Chân 42 | VSS — Ground reference |
| Chân 43 | VDD — Positive supply voltage |
| Chân 44 | RE0/RD — PORTE bit 0 / external memory read strobe |
| Chân 45 | RE1/WR — PORTE bit 1 / external memory write strobe |
| Chân 46 | RE2/CS — PORTE bit 2 / external memory chip select |
| Chân 47 | VSS — Ground reference |
| Chân 48 | VDD — Positive supply voltage |
| Chân 49 | RF0 — PORTF bit 0 |
| Chân 50 | RF1 — PORTF bit 1 |
| Chân 51 | RF2 — PORTF bit 2 |
| Chân 52 | RF3 — PORTF bit 3 |
| Chân 53 | RF4 — PORTF bit 4 |
| Chân 54 | RF5 — PORTF bit 5 |
| Chân 55 | RF6 — PORTF bit 6 |
| Chân 56 | RF7 — PORTF bit 7 |
| Chân 57 | VSS — Ground reference |
| Chân 58 | VDD — Positive supply voltage |
| Chân 59 | RG0 — PORTG bit 0 |
| Chân 60 | RG1 — PORTG bit 1 |
| Chân 61 | RG2 — PORTG bit 2 |
| Chân 62 | RG3 — PORTG bit 3 |
| Chân 63 | RG4 — PORTG bit 4 |
| Chân 64 | AVSS — Analog ground reference |
| Chân 65 | AVDD — Analog positive supply |
| Chân 66 | RH0 — PORTH bit 0 / external memory address bit 0 |
| Chân 67 | RH1 — PORTH bit 1 / external memory address bit 1 |
| Chân 68 | RH2 — PORTH bit 2 / external memory address bit 2 |
| Chân 69 | RH3 — PORTH bit 3 / external memory address bit 3 |
| Chân 70 | VSS — Ground reference |
| Chân 71 | VDD — Positive supply voltage |
| Chân 72 | RJ0 — PORTJ bit 0 / external memory address bit 8 |
| Chân 73 | RJ1 — PORTJ bit 1 / external memory address bit 9 |
| Chân 74 | RJ2 — PORTJ bit 2 / external memory address bit 10 |
| Chân 75 | RJ3 — PORTJ bit 3 / external memory address bit 11 |
| Chân 76 | RJ4 — PORTJ bit 4 / external memory address bit 12 |
| Chân 77 | RJ5 — PORTJ bit 5 / external memory address bit 13 |
| Chân 78 | RJ6 — PORTJ bit 6 / external memory address bit 14 |
| Chân 79 | RJ7 — PORTJ bit 7 / external memory address bit 15 |
| Chân 80 | VSS — Ground reference |
| Chân 81 | VDD — Positive supply voltage |
| Chân 82 | RK0 — PORTK bit 0 / external memory address bit 16 |
| Chân 83 | RK1 — PORTK bit 1 / external memory address bit 17 |
| Chân 84 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC18LC801-I/L phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LC801-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 | 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 |
Bảo phân biệt quan trọng
- Low-voltage variant supports 3V designs (vsPIC18C801-I/L)
- 84-pin PLCC J-Lead package supports socketed mounting (vsPIC18LC801-I/PT)
- ROMless architecture enables external firmware versioning (vsPIC18F8720-I/PT)
Ghi chú thiết kế
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.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C. Not AEC-Q100 qualified (consumer/industrial MCU, not automotive).
