PIC18C452T-I/PT - 8-Bit 40MHz 32KB OTP MCU 44-TQFP | Microchip
MPN: PIC18C452T-I/PT ✗ پایان تولیدPIC18C452T-I/PT نمای کلی
A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, data memory, and programmable I/O peripherals. The PIC18C family extends the legacy PIC16 architecture with a 16-bit wide instruction word, 77 single-word instructions, a hardware multiplier, and an extended 16-level stack, positioning the part as an upgrade path for PIC16C5X, PIC12CXXX, PIC16CXX, and PIC17CXX designs while maintaining source-code compatibility at the architectural level.
Key features include OTP program memory for fast prototyping and small-to-medium volume production, hardware USART for full-duplex asynchronous serial, Master Synchronous Serial Port (MSSP) supporting SPI and I2C, capture/compare/PWM (CCP) modules, a 10-bit ADC with up to 8 input channels, and a Parallel Slave Port for direct microprocessor bus attachment. The wide operating voltage range of 4.2 V to 5.5 V supports standard 5 V embedded designs.
Typical applications include industrial control and automation, sensor interface boards, motor control front-ends, instrumentation and data acquisition, consumer appliances with display/keypad interfaces, and embedded communication gateways requiring USART plus SPI/I2C peripherals. The PSP allows the MCU to behave as a memory-mapped peripheral to an external host processor.
Designers should plan OTP programming into the production flow (windowed JW package is required for code iteration), budget for the 1.5 KB RAM ceiling when selecting higher-protocol stacks, and use the ICD (In-Circuit Debug) variants PIC18C452-I/PT or PIC18F452-I/PT for development before committing to OTP volume. Pin-compatible Flash alternatives exist if field firmware update is required.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
جایگزین‌های drop-in برای PIC18C452T-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 PIC18C452T-I/PT (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Package, Timers, ADC, Operating Temperature, CCP Modules.
PIC18C452-I/PT
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC18C452T-E/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18F452-I/PT
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18F46J50-I/PT
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC18F452T-I/PT
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18F4525-I/PT
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC18C452T-I/PT حداکثر مقادیر مجاز و مشخصات الکتریکی
| Core | PIC18C 8-bit |
| Instruction Set Architecture | 16-bit wide, 77 single-word instructions |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 1.5 KB (1536 bytes) |
| EEPROM | None (OTP device) |
| I/O Pins | 34 |
| ADC | 10-bit, up to 8 channels |
| Timers | 2 x 8-bit, 3 x 16-bit |
| CCP Modules | 2 (Capture/Compare/PWM) |
| Serial Interfaces | 1 x USART, 1 x MSSP (SPI / I2C) |
| Parallel Slave Port (PSP) | Yes |
| Operating Voltage | 4.2 V to 5.5 V |
| دمای کاری | -40C to +85C (Industrial) |
| بسته‌بندی | 44-TQFP (10x10 mm) |
| نوع نصب | Surface Mount |
| سطح MSL | 3 |
| Lead-Free / RoHS | Lead-Free finish (check lot for full RoHS) |
| ICSP / ICD Support | Yes (In-Circuit Serial Programming) |
پیکربندی پین PIC18C452T-I/PT
| پین 1 | MCLR/VPP/RA5 — Master Clear / Programming Voltage / Port A bit 5 |
| پین 2 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| پین 3 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| پین 4 | RA2/AN2/VREF- — Port A bit 2 / Analog input 2 / ADC VREF- |
| پین 5 | RA3/AN3/VREF+ — Port A bit 3 / Analog input 3 / ADC VREF+ |
| پین 6 | RA4/TOCKI — Port A bit 4 / Timer 0 clock input |
| پین 7 | RA5/SS/AN4 — Port A bit 5 / SPI Slave Select / Analog input 4 |
| پین 8 | RE0/RD/AN5 — Port E bit 0 / Parallel Slave Port read / Analog input 5 |
| پین 9 | RE1/WR/AN6 — Port E bit 1 / Parallel Slave Port write / Analog input 6 |
| پین 10 | RE2/CS/AN7 — Port E bit 2 / Parallel Slave Port chip select / Analog input 7 |
| پین 11 | VDD — Digital supply voltage (4.2V-5.5V) |
| پین 12 | VSS — Digital ground |
| پین 13 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| پین 14 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| پین 15 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer 1 oscillator output / T1 clock in |
| پین 16 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer 1 oscillator input / CCP2 |
| پین 17 | RC2/CCP1 — Port C bit 2 / CCP1 PWM output |
| پین 18 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| پین 19 | RD0/PSP0 — Port D bit 0 / Parallel Slave Port bit 0 |
| پین 20 | RD1/PSP1 — Port D bit 1 / Parallel Slave Port bit 1 |
| پین 21 | RD2/PSP2 — Port D bit 2 / Parallel Slave Port bit 2 |
| پین 22 | RD3/PSP3 — Port D bit 3 / Parallel Slave Port bit 3 |
| پین 23 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| پین 24 | RC5/SDO — Port C bit 5 / SPI data out |
| پین 25 | RC6/TX/CK — Port C bit 6 / USART TX / USART clock |
| پین 26 | RC7/RX/DT — Port C bit 7 / USART RX / USART data |
| پین 27 | RD4/PSP4 — Port D bit 4 / Parallel Slave Port bit 4 |
| پین 28 | RD5/PSP5 — Port D bit 5 / Parallel Slave Port bit 5 |
| پین 29 | RD6/PSP6 — Port D bit 6 / Parallel Slave Port bit 6 |
| پین 30 | RD7/PSP7 — Port D bit 7 / Parallel Slave Port bit 7 |
| پین 31 | VSS — Digital ground |
| پین 32 | VDD — Digital supply voltage (4.2V-5.5V) |
| پین 33 | RB0/INT0 — Port B bit 0 / External interrupt 0 |
| پین 34 | RB1/INT1 — Port B bit 1 / External interrupt 1 |
| پین 35 | RB2/INT2 — Port B bit 2 / External interrupt 2 |
| پین 36 | RB3/CCP2 — Port B bit 3 / CCP2 alternate |
| پین 37 | RB4 — Port B bit 4 (interrupt-on-change) |
| پین 38 | RB5 — Port B bit 5 (interrupt-on-change) |
| پین 39 | RB6/PGC — Port B bit 6 / ICSP clock |
| پین 40 | RB7/PGD — Port B bit 7 / ICSP data |
| پین 41 | AVSS — Analog ground |
| پین 42 | AVDD — Analog supply voltage |
| پین 43 | NC — Not connected (per datasheet, no bond-out) |
| پین 44 | NC — Not connected (per datasheet, no bond-out) |
کاربردهای معمول
PIC18C452T-I/PT مناسب است برای 6 کاربردs: Industrial Control & Automation, Sensor Interface & Data Acquisition, Consumer Appliances with Display Interfaces, Embedded Communication Gateways, Motor Control Front-Ends, Instrumentation & Test Equipment.
Industrial Control & Automation
The PIC18C452T-I/PT is well-suited for industrial control and PLC-style I/O modules thanks to its 40 MHz core (10 MIPS), 34 digital I/O, and 4.2V to 5.5V 5V-native operation that interfaces directly to industrial sensors and 24V-tolerant optocouplers with simple resistor dividers. Its 32 KB OTP program memory stores deterministic control firmware, while the 10-bit ADC with up to 8 channels reads analog process variables (temperature, pressure, flow) at sufficient resolution for closed-loop PID. The USART plus MSSP (SPI/I2C) enables connection to HMI displays and remote I/O expansion modules. Compared with PIC18F452-I/PT, the OTP variant offers one-time-program security that prevents reverse engineering of proprietary control algorithms. For new industrial designs, however, the Flash-based PIC18F452-I/PT is preferred because field firmware updates are critical for deployed industrial assets.
پیشنهادی
Sensor Interface & Data Acquisition
For data acquisition front-ends, the PIC18C452T-I/PT provides 10-bit ADC resolution across 8 input channels, sample-and-hold, and a programmable acquisition timer adequate for low-bandwidth sensor arrays (temperature, strain gauge, light, gas). The 1.5 KB RAM supports small circular acquisition buffers, while the USART streams packets to a host computer. Combined with the MSSP in SPI mode, the MCU can read digital sensors (accelerometers, pressure ICs) on the same board. The OTP memory ensures measurement calibration routines cannot be tampered with after deployment, a regulatory benefit for medical or metering applications. Migration tip: pairing this part with a precision external ADC such as MCP3421 yields higher dynamic range when 12-bit or 16-bit accuracy is needed.
پیشنهادی
Consumer Appliances with Display Interfaces
Household appliances (washing machines, microwave ovens, HVAC thermostats) commonly use PIC18C452T-I/PT as the main controller driving character LCDs, keypads, and rotary encoders. The 34 I/O pins comfortably handle a 4x4 keypad matrix, an 8-character LCD parallel bus, and indicator LEDs with spare lines for relay drivers. The two CCP (Capture/Compare/PWM) channels generate PWM signals for motor speed control or TRIAC phase-angle firing. The 40 MHz CPU executes 10 MIPS, allowing real-time debouncing and PID temperature control. The OTP memory secures brand-specific firmware; the 5 V I/O tolerance directly drives standard character LCD modules without level shifters.
پیشنهادی
Embedded Communication Gateways
Protocol-conversion gateways (RS-232 to RS-485, SPI to UART bridges, MODBUS slaves) are a natural fit for PIC18C452T-I/PT. The USART implements RS-232/RS-485 with external transceivers, while the MSSP in I2C mode connects to EEPROM, RTC, or temperature sensors. The PSP (Parallel Slave Port) allows an external host processor to read the gateway's status registers as if it were memory, easing integration into larger systems. With 32 KB of code space, the MCU can host MODBUS RTU, DMX512, or simple custom protocols. For wireless gateway upgrades, designers can pair the MCU with MRF24J40 (ZigBee) or RN171 (WiFi) modules via SPI. The industrial temperature range ensures deployment in uncontrolled enclosures.
پیشنهادی
Motor Control Front-Ends
Low-power DC motor and stepper control benefit from PIC18C452T-I/PT's two CCP modules generating complementary PWM outputs, plus a third timer for commutation sequencing. The 10 MIPS throughput handles trapezoidal commutation profiles for small BLDC motors used in fans, pumps, or robotic actuators. The 10-bit ADC samples back-EMF or current-sense amplifiers at the PWM zero-crossing, closing the speed/torque loop. The 5 V I/O directly interfaces to IR2104 half-bridge gate drivers without level shifting. Designers who need field updates for tuning motor parameters should target PIC18F452-I/PT, which keeps the same PWM/timer architecture but adds Flash for in-application reprogramming.
پیشنهادی
Instrumentation & Test Equipment
Bench-top instrumentation (logic analyzers, signal generators, educational lab kits) historically used PIC18C452T-I/PT to manage front-panel keypads, character LCDs, and USB-to-UART bridges. The 32 KB OTP fits full protocol stacks for SCPI command parsing, while the USART streams captured data to a PC at 115.2 kbps. The MSSP in SPI mode drives DACs or digital potentiometers for waveform synthesis. For modern lab equipment requiring firmware updates as features are added, designers should plan migration to PIC18F452-I/PT or PIC18F46J50-I/PT, both of which are pin-compatible 44-TQFP Flash replacements. The PIC18C452T-I/PT remains useful when the firmware is locked and cost-sensitive educational equipment is being manufactured in volume.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای PIC18C452T-I/PT — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | PIC18C452-I/PT | PIC18C452T-E/PT | PIC18F452-I/PT | PIC18F46J50-I/PT |
|---|---|---|---|---|---|
| Brand | 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 |
| Program Memory Type | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB Flash | 64 KB Flash |
| CPU Speed | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 48 MHz |
| RAM Size | 1.5 KB | 1.5 KB | 1.5 KB | 1.5 KB | 3.8 KB |
| Operating Voltage | 4.2 V - 5.5 V | 4.2 V - 5.5 V | 4.2 V - 5.5 V | 4.2 V - 5.5 V | 2.0 V - 3.6 V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +85C |
| ADC Channels / Resolution | 8 ch / 10-bit | 8 ch / 10-bit | 8 ch / 10-bit | 8 ch / 10-bit | 13 ch / 10-bit |
| Special Peripherals | PSP, MSSP (SPI/I2C), USART | PSP, MSSP, USART | PSP, MSSP, USART | PSP, MSSP, USART, ICD | USB 2.0 FS, PSP, MSSP, USART, ICD |
تفاوت‌های کلیدی
- One-Time-Programmable memory provides firmware IP protection (در مقابلPIC18F452-I/PT)
- Industrial temperature range with full 5 V native I/O (در مقابلPIC18F46J50-I/PT)
- Drop-in migration to Flash with same pinout (در مقابلExternal 8051-based MCUs)
یادداشت‌های طراحی
PIC18C452T-I/PT is OTP (One-Time Programmable): code is written once and cannot be erased. Use the PIC18C452-I/PT (non-T) or PIC18F452-I/PT for development with ICD debugging, then program the OTP version for production. Plan ICSP programming jig time into your SMT line budget since OTP parts cannot be reworked in the field.
The MCU operates from 4.2 V to 5.5 V. Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD pin (pins 11 and 32) and a bulk 10 uF tantalum or aluminum cap on the supply rail. The analog AVDD pin (42) requires its own 100 nF + 10 uF filter with a ferrite bead to isolate ADC noise from digital switching.
Keep the 40 MHz crystal (or external oscillator) traces to pins 13-14 short and symmetric, with the load capacitors (typically 15-33 pF) placed within 3 mm of the OSC pins. Avoid routing signal traces under the crystal or its capacitors. For high-EMI environments, use a 4-layer PCB with a continuous ground plane beneath the TQFP to reduce radiated emissions.
The 10-bit ADC achieves its rated accuracy only when the source impedance is below 2.5 kohm. Add an op-amp buffer (MCP6001 or similar) for high-impedance sensors. Use the RA3/AN3 pin as the dedicated VREF+ input and decouple it with 100 nF + 10 uF; do not tie VREF+ directly to VDD if absolute ADC accuracy matters.
اطلاعات انطباق
Lead-free (Pb-free) finish; RoHS compliance verified per Microchip product page. Industrial temperature grade only - not AEC-Q100 qualified (use PIC18C452T-E/PT for extended temp).