PIC18C452T-I/L - 8-Bit PIC18 MCU 32KB OTP 40MHz | Microchip
MPN: PIC18C452T-I/L ✗ Cuối đờiPIC18C452T-I/L Tóm tắt
An 8-bit microcontroller (MCU) is a small computer-on-a-chip built around an 8-bit data path. Within the broader product taxonomy, an 8-bit MCU sits below 16-bit and 32-bit microcontrollers in processing power but offers the lowest cost, simplest programming model, and lowest power consumption for embedded control. The PIC18 family specifically extends the legacy PIC16 instruction set to 16-bit wide opcodes with 8-bit data, providing C-friendly architecture and up to 10 MIPS performance while retaining RISC simplicity (77 single-word instructions).
Key differentiating features of the PIC18C452T-I/L include 32KB of OTP program memory (16K x 16 organization), 1.5KB of general-purpose RAM, 256 bytes of EEPROM data memory, 34 bidirectional I/O pins, and a 10-bit successive-approximation ADC with up to 8 input channels. Other on-chip peripherals include two 8-bit timers, three 16-bit timers, two capture/compare/PWM (CCP) modules, an enhanced USART, an MSSP (SPI / I2C master-slave) port, a parallel slave port, and a single-cycle hardware 8x8 multiplier.
The architecture implements a Harvard design with separate program and data buses, 16-bit instructions and 8-bit data path, an 8-level hardware stack, and prioritized interrupts. The PLL block allows operation from 4 MHz to 10 MHz oscillator sources while delivering 40 MHz internal execution, giving system designers flexibility in clock selection. The CMOS process provides low-power operation suitable for industrial and consumer embedded applications.
Typical applications include industrial control systems, motor control, sensor interfaces, instrumentation, building automation, HVAC controllers, security and alarm panels, and automotive body electronics. The combination of OTP memory, ample RAM, and rich peripheral set makes the PIC18C452T-I/L a strong fit for medium-complexity embedded designs requiring moderate code size and deterministic real-time response.
When designing with this part, note that OTP memory can be programmed only once; for prototyping or field-updatable designs choose the flash-based PIC18F452 equivalent. The PLCC-44 package is legacy through-hole J-lead; modern designs often migrate to the PIC18F452 in PLCC-44 or 40-pin PDIP, or to surface-mount TQFP/QFN variants. Ensure decoupling capacitors are placed close to VDD/VSS pairs per Microchip PIC18C452 datasheet recommendations.
This page synthesizes distributor stock, pricing, drop-in PIC18C452 family alternatives, and practical design guidance beyond what is available in the Microchip datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho PIC18C452T-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 PIC18C452T-I/L (cùng hình factor và footprint) — khác nhau ở ADC, Package, Mounting Type, Hardware Multiplier, Operating Temperature.
PIC18C452T-E/L
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Xem tài liệu →PIC18C452T-I/L Tỷ lệ tối đa & tính chất điện
| Core | 8-bit PIC18C RISC |
| Instruction Set Width | 16-bit instructions, 8-bit data |
| Program Memory | 32 KB (16K x 16) OTP |
| RAM | 1.5 KB (1536 bytes) |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 40 MHz (10 MIPS) |
| I/O Pins | 34 |
| ADC | 10-bit, up to 8 channels |
| Timers | 2 x 8-bit, 3 x 16-bit |
| CCP Modules | 2 |
| Serial Interfaces | USART (enhanced), MSSP (SPI / I2C), Parallel Slave Port |
| Hardware Multiplier | 8-bit x 8-bit single-cycle |
| Interrupt Priority Levels | High / Low (2 levels) |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 44-pin PLCC (J-Lead), 16.59 x 16.59 mm |
| Kiểu lắp đặt | Surface Mount (PLCC J-Lead) |
Cấu hình chân PIC18C452T-I/L
| Chân 1 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| Chân 2 | OSC1/CLKI — Oscillator crystal input / external clock in |
| Chân 3 | OSC2/CLKO — Oscillator crystal output / clock out |
| Chân 4 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Chân 5 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Chân 6 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| Chân 7 | RA3/AN3/VREF — PORTA bit 3 / analog input 3 / voltage reference |
| Chân 8 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 9 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| Chân 10 | VSS — Ground reference |
| Chân 11 | VDD — Positive supply voltage |
| Chân 12 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Chân 13 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Chân 14 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Chân 15 | RB3/CCP2 — PORTB bit 3 / CCP2 input/output |
| Chân 16 | RB4 — PORTB bit 4 |
| Chân 17 | RB5/PGM — PORTB bit 5 / low-voltage programming |
| Chân 18 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 19 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 20 | VSS — Ground reference |
| Chân 21 | VDD — Positive supply voltage |
| Chân 22 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 osc out / Timer1 clock |
| Chân 23 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 osc in / CCP2 |
| Chân 24 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| Chân 25 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 26 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 27 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 28 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Chân 29 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Chân 30 | VSS — Ground reference |
| Chân 31 | VDD — Positive supply voltage |
| Chân 32 | RD0/PSP0 — PORTD bit 0 / parallel slave port bit 0 |
| Chân 33 | RD1/PSP1 — PORTD bit 1 / parallel slave port bit 1 |
| Chân 34 | RD2/PSP2 — PORTD bit 2 / parallel slave port bit 2 |
| Chân 35 | RD3/PSP3 — PORTD bit 3 / parallel slave port bit 3 |
| Chân 36 | RD4/PSP4 — PORTD bit 4 / parallel slave port bit 4 |
| Chân 37 | RD5/PSP5 — PORTD bit 5 / parallel slave port bit 5 |
| Chân 38 | RD6/PSP6 — PORTD bit 6 / parallel slave port bit 6 |
| Chân 39 | RD7/PSP7 — PORTD bit 7 / parallel slave port bit 7 |
| Chân 40 | VSS — Ground reference |
| Chân 41 | VDD — Positive supply voltage |
| Chân 42 | RE0/RD/AN5 — PORTE bit 0 / read strobe / analog input 5 |
| Chân 43 | RE1/WR/AN6 — PORTE bit 1 / write strobe / analog input 6 |
| Chân 44 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog input 7 |
Ứng dụng tiêu biểu
PIC18C452T-I/L phù hợp cho 6 Áp dụngs: Industrial Control Systems, Sensor Interface and Data Acquisition, Motor Control and PWM Drives, Building Automation and HVAC, Security and Alarm Panels, Consumer Embedded Appliances.
Industrial Control Systems
The PIC18C452T-I/L fits industrial control with its 32 KB OTP program memory, 1.5 KB RAM, and 40 MHz / 10 MIPS core providing deterministic real-time response for PLCs and discrete I/O controllers. Its 34 digital I/O pins can directly interface to opto-isolated inputs, relay drivers, and 24 V industrial signal levels, while the two CCP modules deliver PWM and event-capture for motor and valve control.
Được đề xuất
Sensor Interface and Data Acquisition
The PIC18C452T-I/L suits sensor-interface and data-acquisition designs via its on-chip 10-bit ADC with up to 8 input channels, supporting direct connection to thermocouples, RTDs, and strain-gauge bridges through external signal conditioning. With 1.5 KB of RAM, it can buffer moderate ADC sample streams before transmission over the enhanced USART or MSSP (SPI/I2C) peripherals, easing host-MCU loading in distributed sensor networks.
Được đề xuất
Motor Control and PWM Drives
The PIC18C452T-I/L is well-suited to motor control with two CCP modules producing up to 10-bit PWM outputs for DC and stepper motor drives. Its three 16-bit timers provide precise period measurement for closed-loop speed control, while 34 I/O pins handle quadrature encoder inputs and direction-control signals. The 10 MIPS throughput executes PID control loops comfortably within millisecond control intervals typical of small industrial motors.
Được đề xuất
Building Automation and HVAC
The PIC18C452T-I/L powers building-automation and HVAC controllers thanks to its industrial temperature grade (-40 C to +85 C) and ample peripheral set. Its 10-bit ADC reads temperature, humidity, and pressure sensors, the USART links to networked thermostats and BACnet/Modbus bridges, and the 32 KB OTP holds HVAC state-machine and scheduling firmware. CCP-driven PWM outputs can modulate damper and valve actuators directly without external driver ICs.
Được đề xuất
Security and Alarm Panels
The PIC18C452T-I/L is a strong fit for security panels: its 34 I/O pins accommodate multiple zone inputs, sirens, keypad scanners, and indicator LEDs directly, while the enhanced USART interfaces to central-station modems or IP-comm modules. With 32 KB of OTP memory and 1.5 KB RAM, it holds full zone-monitoring, event-logging, and dialer firmware for residential and light-commercial alarm panels.
Được đề xuất
Consumer Embedded Appliances
The PIC18C452T-I/L drives consumer appliances such as washing machines, dishwashers, and small kitchen equipment where cost-sensitive 8-bit control suffices. Its single-cycle hardware 8x8 multiplier accelerates sensor linearization routines, 34 I/O pins handle user-interface keypads and seven-segment displays, and the MSSP peripheral drives LED-driver ICs over SPI. Industrial temperature rating supports under-cabinet appliance environments reliably.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18C452T-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 | PIC18C452T-E/L | PIC18C452-I/L | PIC18F452-I/L |
|---|---|---|---|---|
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | PIC18C 8-bit | PIC18C 8-bit | PIC18C 8-bit | PIC18F 8-bit |
| Program Memory | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB Flash |
| RAM | 1.5 KB | 1.5 KB | 1.5 KB | 1.5 KB |
| Maximum CPU Frequency | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS |
| Operating Temperature | -40 C to +85 C | -40 C to +125 C | -40 C to +85 C | -40 C to +85 C |
| Packaging Format | Tape & Reel | Tape & Reel | Tray | Tube / Tape & Reel |
| Reprogrammable | No (OTP) | No (OTP) | No (OTP) | Yes (Flash) |
Bảo phân biệt quan trọng
- Extended-temperature variant for harsh environments (vsPIC18C452T-E/L)
- Tray-packaged variant for hand-load production (vsPIC18C452-I/L)
- Flash-based drop-in for in-field reprogrammability (vsPIC18F452-I/L)
Ghi chú thiết kế
Place 100 nF decoupling capacitors as close as possible to every VDD/VSS pair on the 44-PLCC footprint (pins 11/10, 21/20, 31/30, 41/40). For designs where VDD is near the upper 5 V limit, add a bulk 10 uF tantalum or ceramic capacitor near the IC supply pins to suppress switching transients from the ADC and CCP PWM outputs.
OTP memory on PIC18C452T-I/L can only be programmed once - a programming error requires a new device. Use a pre-programmed PIC18F452-I/L or PIC18F452T-I/L development board to validate firmware before committing OTP devices. Also confirm the PLCC J-lead socket orientation: pin 1 is marked by an indented dot on the package top, not at the chamfered corner alone.
Keep analog traces (RA0-RA5, RE0-RE2 used as AN5-AN7) short and routed away from CCP PWM outputs and digital switching signals to preserve ADC accuracy. The 44-pin PLCC's exposed lead frame allows a small copper pour under the package tied to VSS for thermal relief, which is useful when running the ADC continuously at full sampling rate.
Thông tin tuân thủ
Microchip PIC18C family predates full RoHS/REACH documentation standards. Refer to the official Microchip PIC18C452 product page and your distributor's compliance statement for confirmation before placing new-production orders.
