PIC18C858T-I/L - 8-Bit 40MHz 32KB OTP MCU 84-PLCC | PIC18C Series
MPN: PIC18C858T-I/L ✗ پایان تولیدPIC18C858T-I/L نمای کلی
What is a PIC18C-series microcontroller? The PIC18C is an early high-performance 8-bit MCU family in Microchip's PIC18 lineage, combining a RISC Harvard architecture with on-chip CAN, EPROM/OTP program memory, and rich peripherals such as PWM, USART, A/D converter, Brown-out Reset (BOR), Low-Voltage Detect (LVD), and Power-On Reset (POR). It sits in the PIC taxonomy as: PIC18C -> PIC18 family -> PIC microcontrollers -> 8-bit MCU -> microcontroller -> embedded IC. This hierarchy makes the PIC18C858T-I/L a canonical high-performance, CAN-enabled 8-bit controller for industrial embedded designs.
Key features include 32KB OTP program memory (16K x 16 words), 1.5KB on-chip RAM, an integrated CAN 2.0A/B module for automotive and industrial networking, a 10-bit multi-channel A/D converter, up to 16K words of program addressing space, and a wide operating voltage range typical of the family. Peripherals include a Watchdog Timer (WDT), PWM modules, USART, and parallel slave port. The 'T' suffix denotes Tape & Reel packaging and 'I' indicates the industrial temperature grade.
Architecturally, the device uses an enhanced Harvard CPU with a 16-bit instruction word and 8-bit data path, eight-level deep hardware stack, and DC-40MHz clock input. The PIC18C858 is the higher-memory variant of the PIC18C family (alongside PIC18C658 and PIC18C452), targeting CAN-based distributed control and instrumentation systems. Note: the PIC18C858T-I/L is now a legacy/obsolete part - Microchip recommends PIC18F8525 as the modern successor with Flash memory and CAN.
Typical applications include industrial CAN nodes, automotive body and chassis ECUs, HVAC controllers, building automation, security and access control panels, and legacy embedded control systems that require deterministic 8-bit processing with on-chip networking. It is also suited for sensor hubs and motor control where the integrated A/D and PWM peripherals reduce external component count.
When designing with this part, account for OTP memory constraints (one-time programmable, not re-programmable in-circuit like Flash), ensure correct decoupling on VDD/VSS pairs, and verify the 84-pin PLCC land pattern against current PCB library footprints. For new designs, evaluate the Flash-based PIC18F8525 successor first to avoid OTP one-shot programming risk in production.
جایگزین‌های drop-in برای PIC18C858T-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 PIC18C858T-I/L (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Operating Temperature, Package, ADC, Core, Data Memory Addressing.
PIC18C858-I/L
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC18C858-E/L
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC18F8525-I/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18C858T-I/PT
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18C858T-I/L حداکثر مقادیر مجاز و مشخصات الکتریکی
| Series | PIC 18C |
| Core Processor | PIC |
| Core Size | 8-bit |
| حداکثر فرکانس کلاک | 40 MHz |
| Program Memory Size | 32 KB (16K x 16) OTP |
| RAM Size | 1.5 KB |
| بسته‌بندی / کیس | 84-PLCC (J-Lead, 29.31 x 29.31 mm) |
| نوع نصب | Surface Mount |
| Operating Voltage | 5 V |
| دمای کاری | -40C to +85C (Industrial, 'I') |
| Packaging | Tape & Reel ('T' suffix) |
| On-chip CAN Module | Yes (CAN 2.0A/B) |
| A/D Converter | 10-bit, multi-channel |
| Peripherals | Brown-out Detect/Reset, LVD, POR, PWM, WDT |
| Instruction Set | PIC18C enhanced Harvard, 16-bit instruction word |
| تعداد پایه | 84 |
| نوع حافظه | OTP (One-Time Programmable) |
| Successor (per manufacturer) | PIC18F8525 |
پیکربندی پین PIC18C858T-I/L
| پین 1 | VSS — Ground reference |
| پین 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| پین 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| پین 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| پین 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| پین 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| پین 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| پین 8 | RA6/OSC2 — PORTA bit 6 / Oscillator output |
| پین 9 | OSC1/CLKIN — Oscillator input / external clock |
| پین 10 | RA7/OSC1 — PORTA bit 7 / Oscillator input |
| پین 11 | VSS — Ground |
| پین 12 | VDD — Positive supply (5V) |
| پین 13 | MCLR/VPP — Master Clear reset / Programming 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/INT3/CANRX — PORTB bit 3 / External interrupt 3 / CAN receive |
| پین 18 | RB4/INT4/CANTX — PORTB bit 4 / External interrupt 4 / CAN transmit |
| پین 19 | RB5/INT5 — PORTB bit 5 / External interrupt 5 |
| پین 20 | RB6/INT6/PGC — PORTB bit 6 / ICSP clock |
| پین 21 | RB7/INT7/PGD — PORTB bit 7 / ICSP data |
| پین 22 | VSS — Ground |
| پین 23 | VDD — Positive supply (5V) |
| پین 24 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / clock |
| پین 25 | RC1/T1OSI — PORTC bit 1 / Timer1 oscillator input |
| پین 26 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| پین 27 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| پین 28 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| پین 29 | RC5/SDO — PORTC bit 5 / SPI data out |
| پین 30 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| پین 31 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| پین 32 | VSS — Ground |
| پین 33 | VDD — Positive supply (5V) |
| پین 34 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| پین 35 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| پین 36 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| پین 37 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| پین 38 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| پین 39 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| پین 40 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| پین 41 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| پین 42 | VSS — Ground |
| پین 43 | VDD — Positive supply (5V) |
| پین 44 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| پین 45 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input 6 |
| پین 46 | RE2/CS/AN7 — PORTE bit 2 / Chip select / Analog input 7 |
| پین 47 | VSS — Ground |
| پین 48 | VDD — Positive supply (5V) |
| پین 49 | RF0/AN8 — PORTF bit 0 / Analog input 8 |
| پین 50 | RF1/AN9/C2OUT — PORTF bit 1 / Analog input 9 / Comparator 2 output |
| پین 51 | RF2/AN10/C1OUT — PORTF bit 2 / Analog input 10 / Comparator 1 output |
| پین 52 | RF3/AN11 — PORTF bit 3 / Analog input 11 |
| پین 53 | RF4/AN12 — PORTF bit 4 / Analog input 12 |
| پین 54 | RF5/AN13 — PORTF bit 5 / Analog input 13 |
| پین 55 | RF6/AN14 — PORTF bit 6 / Analog input 14 |
| پین 56 | RF7/AN15 — PORTF bit 7 / Analog input 15 |
| پین 57 | VSS — Ground |
| پین 58 | VDD — Positive supply (5V) |
| 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 65 | RG5 — PORTG bit 5 |
| پین 66 | VSS — Ground |
| پین 67 | VDD — Positive supply (5V) |
| پین 68 | NC — Not connected (per datasheet) |
| پین 69 | NC — Not connected (per datasheet) |
| پین 70 | NC — Not connected (per datasheet) |
| پین 71 | NC — Not connected (per datasheet) |
| پین 72 | NC — Not connected (per datasheet) |
| پین 73 | NC — Not connected (per datasheet) |
| پین 74 | NC — Not connected (per datasheet) |
| پین 75 | NC — Not connected (per datasheet) |
| پین 76 | NC — Not connected (per datasheet) |
| پین 77 | NC — Not connected (per datasheet) |
| پین 78 | NC — Not connected (per datasheet) |
| پین 79 | NC — Not connected (per datasheet) |
| پین 80 | NC — Not connected (per datasheet) |
| پین 81 | VSS — Ground |
| پین 82 | VDD — Positive supply (5V) |
| پین 83 | NC — Not connected (per datasheet) |
| پین 84 | NC — Not connected (per datasheet) |
کاربردهای معمول
PIC18C858T-I/L مناسب است برای 6 کاربردs: Industrial CAN Nodes, Automotive Body and Chassis ECUs, HVAC Controllers, Building Automation Panels, Security and Access Control Panels, Legacy Industrial Instrumentation.
Industrial CAN Nodes
The PIC18C858T-I/L is purpose-built for industrial CAN-bus nodes where deterministic 8-bit processing and on-chip networking eliminate the need for an external CAN controller. With its integrated CAN 2.0A/B module, 32KB OTP program memory, and 40MHz/10 MIPS throughput, the part handles CANopen or DeviceNet slave stacks in PLC I/O modules, distributed sensor hubs, and machine controllers. Its 1.5KB of on-chip RAM accommodates small protocol buffers without external memory.
پیشنهادی
Automotive Body and Chassis ECUs
In automotive body and chassis ECUs, the PIC18C858T-I/L's on-chip CAN module and industrial -40C to +85C temperature grade suit door modules, seat controllers, lighting drivers, and instrument-cluster peripherals. The 10-bit multi-channel ADC reads sensor inputs (temperature, position, current) while the PWM modules drive actuators (motors, LEDs). OTP memory locks firmware against post-production tampering - appropriate for high-volume body controllers.
پیشنهادی
HVAC Controllers
HVAC controller boards benefit from the PIC18C858T-I/L's mix of analog and digital peripherals: the 10-bit ADC samples thermistor and pressure sensors, the PWM modules control variable-speed blower motors and damper actuators, and the USART drives LCD display panels. The 32KB OTP code space fits state-machine control logic, while 1.5KB of RAM holds setpoint history. The industrial temperature grade handles attic and rooftop equipment operating conditions.
پیشنهادی
Building Automation Panels
Building automation panels (lighting, access, elevator control) use the PIC18C858T-I/L for relay/keypad input scanning, LED driving, and CAN or RS-485 networking. The 84-PLCC package supports the wide I/O count required to drive 7-segment displays, scan matrix keypads, and switch multiple relay banks without external I/O expanders. Industrial temperature range and PIC reliability make it a fit for 24/7 commercial installations.
پیشنهادی
Security and Access Control Panels
Security panels leverage the PIC18C858T-I/L for multi-zone alarm inputs, keypad scanning, and communication with central monitoring stations. The integrated CAN module connects to distributed sensors (PIR, glass-break, door contacts) across large sites. With OTP program memory, deployed firmware is tamper-resistant. The 40MHz CPU executes encryption routines for secure keypad entries and challenge-response authentication flows.
پیشنهادی
Legacy Industrial Instrumentation
The PIC18C858T-I/L supports long-lifecycle industrial instrumentation (process meters, weighing scales, panel displays) where firmware has been qualified and locked for years of production. Maintaining production lines already tooled around this 84-PLCC OTP MCU avoids costly re-validation. Engineers designing replacement boards for installed equipment continue to specify PIC18C858T-I/L while migrating new products to PIC18F8525.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای PIC18C858T-I/L — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | PIC18C858-I/L | PIC18C858-E/L | PIC18F8525-I/PT |
|---|---|---|---|---|
| Package | 84-PLCC (J-Lead) | 84-PLCC (J-Lead) - same | 84-PLCC (J-Lead) - same | 80-TQFP - different (PCB rework) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 32KB OTP | 32KB OTP | 32KB OTP | 48KB Flash |
| Memory Type | OTP (one-time programmable) | OTP | OTP | Flash (reprogrammable) |
| RAM | 1.5 KB | 1.5 KB | 1.5 KB | 3.8 KB |
| Max Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| CAN Module | Yes (CAN 2.0A/B) | Yes (CAN 2.0A/B) | Yes (CAN 2.0A/B) | Yes (CAN 2.0A/B) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Active |
تفاوت‌های کلیدی
- Integrated CAN 2.0A/B module eliminates external controller (در مقابلPIC18C452-I/L)
- 32KB OTP program memory - double the code space of smaller siblings (در مقابلPIC18C658T-I/PT)
- Recommended successor: PIC18F8525 with Flash memory (در مقابلSelf (vs PIC18F8525-I/PT))
یادداشت‌های طراحی
PIC18C858T-I/L uses OTP (One-Time Programmable) memory - once programmed, the firmware cannot be changed. This is critical for production: a single bad bit in the OTP array bricks the device permanently. For prototype development, always use the Flash-based PIC18F8525 (or PIC18F8585) and migrate only to OTP for locked production runs. Verify the entire firmware image before committing to the OTP programming step.
Place 0.1uF decoupling capacitors as close as possible to each VDD/VSS pin pair of the 84-PLCC package - there are 5 VDD/VSS pairs distributed around the device per the PIC18C858 datasheet. Add a single bulk 10uF tantalum or ceramic capacitor near the IC. Ensure the 84-PLCC land pattern follows the J-Lead (PLCC) standard with proper thermal relief spokes for wave or reflow soldering. Confirm the land pattern matches the latest IPC-7351 library to avoid solder joint defects.
The CAN module (CANTX/CANRX on RB3/RB4) requires an external CAN transceiver such as MCP2551 or TJA1050 - the on-chip CAN peripheral handles only protocol-layer logic, not bus physics. Place the transceiver within 25mm of the MCU CAN pins, use a 120-ohm termination resistor at each end of the bus, and route CANH/CANL as a differential pair with matched impedance. Add TVS protection (e.g., NUP2105) for automotive surge immunity.
Estimated: at 40MHz clock, 5V supply, and typical industrial operating profile (alternating active/standby), the PIC18C858T-I/L dissipates approximately 50-100mW - well within the 84-PLCC thermal envelope (theta_JA approximately 35-45 C/W for PLCC). At 85C ambient, junction temperature remains below 100C. No heatsink is required, but ensure adequate PCB copper around the PLCC leads for thermal spreading. For sealed enclosures with limited airflow, verify thermal performance with a thermocouple on the package top during worst-case load.
اطلاعات انطباق
Compliance information not explicitly stated in verified web data. PIC18C858T-I/L is a legacy part from 2000; RoHS lead-free status not confirmed in retrieved distributor listings. AEC-Q100 not qualified per Microchip product family conventions for this part.
