PIC18C252-I/SP - 8-bit OTP MCU 32KB Flash 40MHz | Microchip
MPN: PIC18C252-I/SP ⚠ Lần mua cuốiPIC18C252-I/SP Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, RAM, and peripheral interfaces. The PIC18 family sits within the larger PIC RISC architecture hierarchy: PIC18C -> enhanced 8-bit PIC -> 8-bit PIC microcontroller -> microcontroller -> embedded semiconductor. PIC18C devices specifically combine Harvard architecture, 16-bit-wide instructions, and C-optimized peripheral sets, making them a step above baseline PIC16 parts in both performance and addressable memory.
Key features of the PIC18C252-I/SP include an integrated 10-bit Analog-to-Digital Converter (ADC) with multiple input channels, three timer modules, a Capture/Compare/PWM (CCP) module, and hardware serial interfaces including I2C, SPI, and USART. The wide 2.0V to 5.5V operating range and industrial -40C to +85C temperature grade suit both battery-powered and industrial environments. The OTP program memory allows one-time field programming, useful for low-cost production units where firmware changes are not anticipated.
The device implements the PIC18 instruction set with 16-bit opcodes and an 8-bit data path, supporting linear program memory addressing up to 32 KB and a banked RAM architecture. A hardware multiplier and 31-level deep stack support C compilers and interrupt-driven designs. Brown-out Reset (BOR), Watchdog Timer (WDT), and In-Circuit Serial Programming (ICSP) are integrated.
Typical applications include industrial control subsystems, appliance controllers, automotive body electronics, sensor signal conditioning with on-chip ADC, and low-cost consumer devices. The SPDIP-28 footprint is breadboard-friendly for prototyping and field-replaceable designs.
Design tip: because the PIC18C252-I/SP is OTP-based, plan firmware carefully - any code revision requires a new part. For iterative development or field updates, migrate to the flash-based PIC18F252 in the same SPDIP-28 pinout.
This page synthesizes Microchip distributor pricing, parametric comparison vs flash-based PIC18F alternatives, and practical design notes beyond the manufacturer datasheet, with content tailored for engineers maintaining legacy systems.
Bộ thay thế dễ dàng lắp đặt cho PIC18C252-I/SP — 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 PIC18C252-I/SP (cùng hình factor và footprint) — khác nhau ở Mounting Type, ADC, Core Architecture, I/O Pins, Instruction Set.
PIC18F252-I/SP
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F252-I/SP
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18C252-I/SP Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit RISC |
| Family | PIC18C |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 32 KB (16K x 16 words) |
| Data RAM | 1.5 KB |
| Data EEPROM | Not present |
| Maximum CPU Speed | 40 MHz |
| Performance | 10 MIPS |
| Instruction Set | 77 instructions, 16-bit opcodes |
| I/O Pins | 23 |
| ADC | 10-bit, multi-channel |
| Timers | 3 |
| CCP Modules | 1 (Capture/Compare/PWM) |
| Serial Interfaces | I2C, SPI, USART |
| Operating Voltage | 2.0 V to 5.5 V |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 28-pin SPDIP (SP) |
| Kiểu lắp đặt | Through-Hole |
| ICSP | Yes (In-Circuit Serial Programming) |
| Brown-Out Reset | Yes |
| Watchdog Timer | Yes |
Cấu hình chân PIC18C252-I/SP
| Chân 1 | MCLR/VPP/RA5 — Master Clear (reset) input / ICSP programming voltage / alternate RA5 |
| Chân 2 | RA0/AN0 — PORTA bit 0 / ADC input channel 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / ADC input channel 1 |
| Chân 4 | RA2/AN2 — PORTA bit 2 / ADC input channel 2 |
| Chân 5 | RA3/AN3 — PORTA bit 3 / ADC input channel 3 |
| Chân 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 7 | AVDD — Analog power supply |
| Chân 8 | AVSS — Analog ground |
| Chân 9 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock input / PORTA bit 7 |
| Chân 10 | OSC2/CLKO/RA6 — Crystal oscillator output / clock output / PORTA bit 6 |
| Chân 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Chân 12 | RC1/T1OSI — PORTC bit 1 / Timer1 oscillator input |
| Chân 13 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Chân 14 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 15 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 16 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 17 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| Chân 18 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| Chân 19 | VSS — Digital ground |
| Chân 20 | VDD — Digital power supply |
| Chân 21 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Chân 22 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Chân 23 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Chân 24 | RB3/CCP2 — PORTB bit 3 / CCP2 alternate |
| Chân 25 | RB4 — PORTB bit 4 |
| Chân 26 | RB5 — PORTB bit 5 |
| Chân 27 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 28 | RB7/PGD — PORTB bit 7 / ICSP data |
Ứng dụng tiêu biểu
PIC18C252-I/SP phù hợp cho 7 Áp dụngs: Industrial Control Subsystems, Appliance Control Boards, Automotive Body Electronics (Legacy), Sensor Signal Conditioning Nodes, Low-Cost Consumer Devices, Educational and Prototyping Platforms, HVAC and Environmental Controllers.
Industrial Control Subsystems
The PIC18C252-I/SP fits industrial control subsystems that need reliable 8-bit processing at 10 MIPS with on-chip ADC and serial interfaces. Its 32 KB OTP program memory accommodates moderate-sized control firmware including state machines, PID loops, and communication stacks. The industrial -40 C to +85 C temperature range and 2.0V-5.5V supply tolerance allow direct deployment on 24V-sourced factory rails with simple regulators. Placed as the main MCU on a control board, it reads sensor inputs via the 10-bit ADC, drives actuators through PWM outputs, and reports status over RS-485 via the integrated USART.
Được đề xuất
Appliance Control Boards
The PIC18C252-I/SP is well-suited to appliance control boards where the firmware is finalized at production and the cost-sensitive SPDIP-28 package simplifies assembly. Its CCP module generates PWM for motor speed control, the 10-bit ADC monitors temperature and current sensors, and the I2C/SPI port drives character LCDs or EEPROM storage. Operating from a single 5V rail, the device replaces discrete logic with a programmable platform, reducing BOM cost while adding features like fault logging and soft-start.
Được đề xuất
Automotive Body Electronics (Legacy)
The PIC18C252-I/SP is found in mature automotive body-electronics modules such as lighting controllers, seat controllers, and HVAC blend-door actuators where the design is locked to the PIC18C peripheral set. Its wide operating voltage tolerates load-dump events and its industrial temp range covers under-dash environments. Designers should confirm AEC-Q100 status with the specific automotive module - the standard PIC18C252-I/SP is industrial-grade, not automotive-qualified.
Được đề xuất
Sensor Signal Conditioning Nodes
Sensor signal conditioning nodes benefit from the PIC18C252-I/SP's 10-bit ADC, hardware multiplier, and interrupt-driven peripheral set, allowing real-time linearization and filtering without external DSP. The 1.5 KB RAM supports circular buffers for moving-average filtering, while USART and I2C/SPI enable transmission to a host controller. With 23 I/O pins, the device handles multi-channel sensor aggregation in a single SPDIP-28 footprint.
Được đề xuất
Low-Cost Consumer Devices
Cost-sensitive consumer products that lock firmware at production can leverage the PIC18C252-I/SP's low unit cost at the SPDIP-28 price point combined with integrated peripherals, eliminating external ADC, UART, and timer chips. The OTP program memory deters cloning and supports anti-counterfeit strategies. For products with firmware revisions, evaluate the flash-based PIC18F252-I/SP as a same-footprint alternative.
Được đề xuất
Educational and Prototyping Platforms
The PIC18C252-I/SP is breadboard-friendly with its 0.1-inch pitch SPDIP-28 package, making it a solid choice for educational labs teaching embedded C programming, interrupt handling, and peripheral interfacing. Students can experiment with the 10-bit ADC, PWM generation, and serial protocols without surface-mount soldering challenges. Universities maintaining legacy curricula on PIC18C should plan migration to PIC18F252-I/SP for new lab kits.
Được đề xuất
HVAC and Environmental Controllers
HVAC and environmental controller designs use the PIC18C252-I/SP to read temperature, humidity, and pressure sensors via the 10-bit ADC and to drive relays, fans, and valves through PWM or GPIO outputs. The integrated USART supports Modbus RTU communication with a central BMS, and the wide 2.0V-5.5V supply allows operation from 24VAC-derived rails. For new installations with firmware updates, the PIC18F252-I/SP offers the same peripheral set with flash reprogrammability.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18C252-I/SP — 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 | PIC18F252-I/SP | PIC18C252-I/SO |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-pin SPDIP (SP) | 28-pin SPDIP (SP) - same | 28-pin SOIC (SO) - different |
| Program Memory Type | OTP (32 KB) | Flash (32 KB) | OTP (32 KB) - same |
| Program Memory Size | 32 KB | 32 KB | 32 KB |
| Data RAM | 1.5 KB | 1.5 KB | 1.5 KB |
| Data EEPROM | None | 256 bytes | None |
| Maximum Clock | 40 MHz | 40 MHz | 40 MHz |
| I/O Pins | 23 | 23 | 23 |
| Lifecycle Status | Last-time-buy | Active | Last-time-buy |
| ICSP Reprogramming | No (OTP) | Yes (Flash) | No (OTP) |
Bảo phân biệt quan trọng
- Manufacturer-recommended flash successor in same footprint (vsPIC18F252-I/SP)
- Through-hole package for prototyping and field serviceability (vsPIC18C252-I/SO)
- OTP memory provides firmware anti-tamper protection (vsPIC18F252-I/SP)
Ghi chú thiết kế
Estimated: do not design new products around the PIC18C252-I/SP - it is in last-time-buy status per Microchip's product page. For new designs use the flash-based PIC18F252-I/SP, which shares the same SPDIP-28 pinout and PIC18 architecture but offers in-circuit reprogrammability. If you must stay on PIC18C252-I/SP, lock the firmware early, order lifetime-buy quantities, and validate second-source supply with your distributor.
Place the 28-pin SPDIP socket on 0.1-inch (2.54 mm) pitch to allow easy firmware swaps during development. Keep the analog AVSS/AVDD traces short and use a star-ground topology to minimize ADC noise. Decouple VDD with 100 nF ceramic plus 10 uF bulk within 5 mm of the pins, and decouple AVDD with its own 100 nF cap tied to AVSS to keep ADC readings stable.
Estimated: at 40 MHz and 5V VDD, the PIC18C252-I/SP typically draws 15-20 mA active current. Brown-Out Reset (BOR) should be enabled in the configuration bits to prevent code execution at low VDD that can corrupt OTP. For battery-powered designs, switch to the LF version or use sleep modes aggressively - the integrated WDT with postscaler keeps a slow watchdog wakeup without full CPU operation.
The 10-bit ADC achieves its rated accuracy only with a low-impedance source; add an op-amp buffer if the sensor output impedance exceeds 2.5 kohm as recommended by the Microchip datasheet. Keep analog traces away from the OSC1/OSC2 crystal traces and from switching digital lines. Use the dedicated AVSS/AVDD pins even if the ADC is unused - leaving them floating can introduce noise into PORTB digital reads.
Thông tin tuân thủ
RoHS/lead-free status not explicitly stated in the verified data for the /SP SPDIP-28 variant. Industrial -40C to +85C temperature grade; not AEC-Q100 qualified. Confirm exact compliance markings with Microchip or distributor documentation before placing RoHS-required orders.
