PIC18F452-I/PT - 8-Bit 40MHz 32KB Flash MCU 44-TQFP | Microchip
MPN: PIC18F452-I/PT ✓ فعالPIC18F452-I/PT نمای کلی
A microcontroller (MCU) is an integrated circuit combining a CPU, non-volatile program memory (Flash/ROM), volatile data memory (RAM), and configurable peripherals (timers, ADC, communication ports) on a single silicon die. MCUs form the lowest tier of the computing hierarchy, embedded beneath microprocessors in everything from consumer appliances to industrial controllers, and they execute firmware directly from on-chip Flash rather than external memory. The PIC18 family is Microchip's high-tier 8-bit line, providing 16-bit-wide instructions and a C compiler-friendly architecture.
Key features of the PIC18F452-I/PT include a 10 MIPS execution rate (100 ns instruction cycle), 256 bytes of data EEPROM, an ICD-friendly In-Circuit Debugger interface, two Capture/Compare/PWM modules, a Master Synchronous Serial Port configurable as either 3-wire SPI or 2-wire I2C, and a USART with 9-bit address masking. The device supports self-programming, allowing firmware upgrades in the field without external programmer hardware, and it consumes microamp-range currents in Sleep mode through nanoWatt technology.
Architecturally, the PIC18F452 uses an enhanced Harvard architecture with separate program and data buses, a 16-bit instruction word (vs 14-bit in PIC16), and a hardware multiplier capable of 8x8 single-cycle operations. Its 40 MHz internal clock can be derived from crystals, resonators, or internal RC oscillators, and the wide 4.2V to 5.5V supply range suits both battery and line-powered designs.
Typical applications include industrial automation controllers, automotive body and HVAC modules, consumer appliance control boards, low-end data acquisition systems, and educational/development platforms where code portability from older PIC16/PIC17 designs is required. The 8-channel ADC is well matched to sensor multiplexing in instrumentation.
When designing with this device, note that the 40-pin PDIP and 44-pin TQFP variants share the same peripheral set but differ in available I/O count; the TQFP version exposes all 34 I/O pins including additional high-priority interrupts. Always provide adequate decoupling (0.1 uF + 10 uF bulk) near VDD/AVDD/VSS pins.
جایگزین‌های drop-in برای PIC18F452-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 PIC18F452-I/PT (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Timers, Operating Temperature, Package, Program Memory Size, Core Architecture.
PIC18F458-I/PT
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC18F4525-I/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18F4520-I/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18F4520-E/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18F442-I/PT
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC18F448-I/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18F452-I/PT حداکثر مقادیر مجاز و مشخصات الکتریکی
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 1.5 KB (1536 bytes) |
| Data EEPROM | 256 bytes |
| حداکثر فرکانس کلاک | 40 MHz |
| Instruction Execution Rate | 10 MIPS (100 ns instruction cycle) |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| I/O Pins | 34 |
| Analog-to-Digital Converter | 10-bit, 8 channels |
| Timers | 1 x 8-bit, 3 x 16-bit |
| Capture/Compare/PWM Modules | 2 (CCP) |
| Serial Interfaces | MSSP (SPI/I2C), USART |
| بسته‌بندی | 44-pin TQFP (PT) 10x10 mm |
| دمای کاری | -40 C to +85 C (Industrial) |
| نوع نصب | Surface Mount |
| وضعیت RoHS | Compliant |
| Self-Programming | Yes (Flash, supported in-circuit) |
| Brown-out Detect | Yes (BOD) |
پیکربندی پین PIC18F452-I/PT
| پین 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| پین 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| پین 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| پین 4 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / ADC VREF- |
| 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 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| پین 9 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input 6 |
| پین 10 | RE2/CS/AN7 — PORTE bit 2 / Chip Select / Analog input 7 |
| پین 11 | VDD — Positive supply voltage |
| پین 12 | VSS — Ground reference |
| پین 13 | OSC1/CLKI — Oscillator crystal input / External clock input |
| پین 14 | OSC2/CLKO/RA6 — Oscillator crystal output / Clock output / PORTA bit 6 |
| پین 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| پین 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| پین 17 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| پین 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| پین 19 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| پین 20 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| پین 21 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| پین 22 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| پین 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| پین 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| پین 25 | RC6/TX/CK — PORTC bit 6 / USART async transmit / sync clock |
| پین 26 | RC7/RX/DT — PORTC bit 7 / USART async receive / sync data |
| پین 27 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| پین 28 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| پین 29 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| پین 30 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| پین 31 | VSS — Ground reference |
| پین 32 | VDD — Positive supply voltage |
| پین 33 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| پین 34 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| پین 35 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| پین 36 | RB3/CCP2 — PORTB bit 3 / CCP2 output (alternate) |
| پین 37 | RB4 — PORTB bit 4 (interrupt-on-change) |
| پین 38 | RB5 — PORTB bit 5 (interrupt-on-change) |
| پین 39 | RB6/PGC — PORTB bit 6 / In-Circuit Debugger clock |
| پین 40 | RB7/PGD — PORTB bit 7 / In-Circuit Debugger data |
| پین 41 | AVSS — Analog ground reference |
| پین 42 | AVDD — Analog positive supply voltage |
| پین 43 | NC — Not connected (no internal bond) |
| پین 44 | NC — Not connected (no internal bond) |
کاربردهای معمول
PIC18F452-I/PT مناسب است برای 6 کاربردs: Industrial Automation Controllers, Automotive Body and HVAC Modules, Data Acquisition Systems, Consumer Appliance Control Boards, Educational and Development Platforms, Sensor Multiplexing Hubs.
Industrial Automation Controllers
The PIC18F452-I/PT fits PLC and machine-control sub-systems thanks to its 40 MHz execution rate and 8-channel 10-bit ADC for sensor multiplexing. The 34 digital I/O lines drive relays, solenoids, and optocouplers, while the two CCP modules generate PWM outputs for proportional valve control. Industrial designs benefit from the 4.2-5.5 V supply range, which tolerates slightly unregulated 5 V rails common on factory floors. Its nanoWatt Sleep mode drops consumption below 1 uA for battery-backed panel applications.
پیشنهادی
Automotive Body and HVAC Modules
The PIC18F452-I/PT (industrial temperature grade) is commonly used in non-powertrain automotive body controllers, HVAC flaps, seat controllers, and dashboard sub-displays. Its wide operating voltage tolerates load-dump transients with external TVS protection, and the 10-bit ADC reads thermistor, potentiometer, and current-sense inputs in climate control loops. The MSSP port drives SPI or I2C peripherals, while the USART interfaces with body control networks. For under-hood 125 C operation, the PIC18F452-E/PT variant is the same die in extended temperature grade.
پیشنهادی
Data Acquisition Systems
With 8 channels of 10-bit ADC and 32 KB of Flash for buffering/calibration routines, the PIC18F452-I/PT supports low-channel-count data loggers in environmental monitoring and laboratory instrumentation. The ADC's successive-approximation architecture achieves adequate throughput for 1 kHz sample rates per channel, and the USART streams data to host PCs or external memory. The 256-byte EEPROM stores calibration constants across power cycles, while the SSP port reads external SPI sensors or ADC expanders. The device's deterministic interrupt latency simplifies time-stamped sampling designs.
پیشنهادی
Consumer Appliance Control Boards
Washing machines, dishwashers, and microwave ovens use the PIC18F452-I/PT as the main controller because it integrates analog sensing, digital I/O for user interfaces, and PWM generation for motor drive. Its 8-bit architecture is sufficient for user-interface state machines, while Flash self-programming supports field firmware updates via the appliance's service port. The 44-pin TQFP package suits reflow-soldered high-volume production, and the wide 4.2-5.5 V supply matches rectified 5 V rails from small transformer-based power supplies commonly found in appliances.
پیشنهادی
Educational and Development Platforms
The PIC18F452-I/PT is a common teaching platform in university embedded systems courses because of its rich peripheral set (ADC, PWM, I2C, SPI, USART), mature MPLAB X toolchain, and abundant third-party example code. The 44-TQFP package exposes every peripheral pin, including the ICD (In-Circuit Debugger) interface for live breakpoints. Students learn real-time scheduling, ADC quantization, and interrupt-driven firmware using a documented C compiler-friendly instruction set. Legacy PIC16/PIC17 code can be migrated upwards with minimal effort thanks to the upward-compatible architecture.
پیشنهادی
Sensor Multiplexing Hubs
Multi-sensor nodes in environmental and HVAC monitoring use the PIC18F452-I/PT to poll 4-8 analog sensors, perform linearization, and forward results via RS-485 or USART. The 8-channel ADC with internal sample-and-hold sequentially scans thermistors, photocells, and pressure transducers, while the CCP modules generate timing pulses for ultrasonic distance sensors. Its 32 KB Flash holds calibration tables and PID control loops, and the EEPROM stores non-volatile configuration. The 34 digital I/O directly interface with sensor enable lines and status LEDs without external logic.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای PIC18F452-I/PT — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | PIC18F458-I/PT | PIC18F4525-I/PT | PIC18F4520-I/PT | PIC18F4520-E/PT | PIC18F442-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same |
| Program Memory (Flash) | 32 KB | 32 KB | 48 KB | 32 KB | 32 KB | 16 KB |
| RAM | 1.5 KB | 1.5 KB | 3.9 KB | 1.5 KB | 1.5 KB | 0.768 KB |
| Data EEPROM | 256 bytes | 256 bytes | 1 KB | 256 bytes | 256 bytes | 256 bytes |
| Max Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Supply Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V |
| ADC | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 8 channels |
| CAN Controller | No | Yes (CAN 2.0B) | No | No | No | No |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C | -40 C to +85 C |
تفاوت‌های کلیدی
- CAN bus integration at zero PCB change (در مقابلPIC18F442-I/PT)
- Doubled program memory for richer firmware (در مقابلPIC18F452-I/PT (32 KB))
- Wider supply range for battery-powered designs (در مقابلPIC18F452-I/PT (4.2-5.5V))
یادداشت‌های طراحی
Place a 0.1 uF ceramic decoupling capacitor as close as possible to each VDD/VSS pair (pins 11/12 and 31/32), and a single 10 uF bulk tantalum or ceramic capacitor at the supply entry. Add an additional 0.1 uF + 10 uF pair at AVDD/AVSS (pins 42/41) for clean analog reference. The PIC18F452-I/PT draws up to 25 mA at 40 MHz with all peripherals active, so choose a regulator with at least 100 mA headroom. For battery-backed designs, the nanoWatt Sleep mode reduces current to under 1 uA.
The 44-pin TQFP at 10x10 mm has 0.8 mm pitch leads, which requires fine-pitch PCB manufacturing (6-mil trace/space minimum) and stencil-printed solder paste for reflow. Keep analog traces (AN0-AN7, VREF+/-, AVDD, AVSS) short and away from switching digital lines; route them on the opposite layer from the high-frequency oscillator and PWM outputs. Use a guard ring around the analog section connected to AVSS. The exposed thermal pad (if any) on the TQFP must be soldered to a copper pour for mechanical stability.
Do NOT confuse the PIC18F452-I/PT (44-pin TQFP, industrial temp) with the PIC18F452-I/P (40-pin PDIP) - the pinouts differ and they are not drop-in. Always verify the package suffix (/PT vs /P vs /L vs /SP) before ordering. When migrating firmware from PIC18F452 to PIC18F4520, note that register names and bit positions changed; recompile against the new header file. Do not exceed 5.5 V on VDD - the absolute maximum is 6.5 V but sustained overvoltage reduces Flash retention. Always assert MCLR with a 10 kohm pull-up and a 0.1 uF cap for clean reset.
اطلاعات انطباق
RoHS compliant per Microchip product page. The -I/PT industrial grade is rated -40 to +85 C, not AEC-Q100 qualified; use the -E/PT extended grade variant for 125 C operation. Lead-free reflow-compatible per JEDEC J-STD-020.