PIC18F252-E/SO - 8-Bit 40MHz 32KB Flash MCU 28-SOIC | Microchip
MPN: PIC18F252-E/SO ✓ Hoạt độngPIC18F252-E/SO Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data-path CPU with on-chip program memory, data memory and peripheral interfaces. Within the broader taxonomy, the PIC18F252 sits in the PIC18 family of high-performance 8-bit MCUs, which itself belongs to Microchip's PIC microcontroller line, the embedded microcontroller category, and finally the semiconductor integrated-circuit hierarchy. The PIC18 family's enhanced instruction set, hardware multiplier and 16-bit-wide instruction word place it above legacy PIC16C5X/PIC16CXX architectures while remaining source-compatible with them.
Key features of the PIC18F252-E/SO include an extended (-40C to +125C) operating temperature range, a wide 2.0 V to 5.5 V supply range, self-programmability for in-field firmware updates, an ICD (In-Circuit Debugger) interface, and nanoWatt power-management technology. Five channels of 10-bit ADC, a USART with addressable addressing, and the Master Synchronous Serial Port (MSSP) deliver rich analog and digital connectivity for cost-sensitive designs.
The device uses a 16-bit Harvard architecture with separate program and data buses, enabling single-cycle instruction fetch plus single-cycle ALU operations. The CMOS FLASH process grants low active and sleep currents while retaining in-application re-programmability. Hardware multiplication (8x8 in one cycle) accelerates arithmetic in motor and signal-processing code paths.
Typical applications include consumer appliances, low-end motor control (small DC and stepper drivers), sensor-conditioning nodes, industrial control panels, and any 5V-tolerant embedded product that needs 32 KB of code space and a stable 8-bit platform. Pair the MCU with a bootloader over M-USB or RS-232 and you have a complete low-density control solution.
When designing with the PIC18F252-E/SO, observe the supply-voltage window of 2.0-5.5 V (4.2-5.5 V is typical for -E parts in industrial applications). Place a 0.1 uF decoupling capacitor close to each VDD pin and a bulk capacitor near the IC. Reserve the MCLR pin for a proper reset circuit (typically 10 kohm pull-up to VDD plus a diode to VDD) to ensure clean in-circuit debugging.
This page synthesizes distributor pricing, drop-in alternatives and practical design notes not found in the manufacturer datasheet alone, and is structured for AI search engines (AEO/GEO) so engineers can find answers in the FAQ and application sections without scrolling through full documents.
Bộ thay thế dễ dàng lắp đặt cho PIC18F252-E/SO — 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 PIC18F252-E/SO (cùng hình factor và footprint) — khác nhau ở Package, ADC, Timers, Operating Temperature, Core Architecture.
PIC18F252-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F2420-E/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F2520-E/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F2423-E/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F2480-E/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F24K20-E/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F252-E/SO Tỷ lệ tối đa & tính chất điện
| Core | PIC18 (8-bit) |
| Instruction Set Architecture | RISC, 16-bit instructions |
| Maximum CPU Frequency | 40 MHz (10 MIPS) |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data RAM | 1.5 KB (1536 bytes) |
| EEPROM | 256 bytes |
| I/O Pins | 23 |
| Timers | 4 |
| CCP/PWM Channels | 2 |
| ADC | 10-bit, 5 channels |
| Serial Interfaces | SPI, I2C (MSSP), USART |
| Điện áp cung cấp | 2.0 V to 5.5 V (4.2 V to 5.5 V typical for -E) |
| Nhiệt độ hoạt động | -40C to +125C (Extended, -E suffix) |
| Hộp | 28-pin SOIC (0.295 inch / 7.50 mm width) |
| Self-Programming | Yes (Flash) |
| In-Circuit Debug | Yes (ICD) |
| Hardware Multiplier | 8x8 single-cycle |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC18F252-E/SO
| Chân 1 | MCLR — Master Clear (Reset) input, active low |
| Chân 2 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Chân 3 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Chân 4 | RA2/AN2/VREF- — Digital I/O / Analog input 2 / ADC VREF- |
| Chân 5 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC VREF+ |
| Chân 6 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — Digital I/O / Analog input 4 / SPI Slave Select |
| Chân 8 | VSS — Ground reference |
| Chân 9 | OSC1/CLKI — Oscillator crystal input / external clock |
| Chân 10 | OSC2/CLKO — Oscillator crystal output / clock out |
| Chân 11 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / clock input |
| Chân 12 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 |
| Chân 13 | RC2/CCP1 — Digital I/O / CCP1 (PWM output) |
| Chân 14 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Chân 15 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Chân 16 | RC5/SDO — Digital I/O / SPI data out |
| Chân 17 | RC6/TX/CK — Digital I/O / USART TX / clock |
| Chân 18 | RC7/RX/DT — Digital I/O / USART RX / data |
| Chân 19 | VSS — Ground reference |
| Chân 20 | VDD — Positive supply voltage |
| Chân 21 | RB0/INT0 — Digital I/O / External interrupt 0 |
| Chân 22 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Chân 23 | RB2/INT2 — Digital I/O / External interrupt 2 |
| Chân 24 | RB3/CCP2 — Digital I/O / CCP2 alternate pin |
| Chân 25 | RB4 — Digital I/O / interrupt-on-change |
| Chân 26 | RB5/PGM — Digital I/O / LVP programming |
| Chân 27 | RB6/PGC — Digital I/O / ICD clock |
| Chân 28 | RB7/PGD — Digital I/O / ICD data |
Ứng dụng tiêu biểu
PIC18F252-E/SO phù hợp cho 6 Áp dụngs: Industrial Control Panels, Small Motor and Stepper Control, Sensor Conditioning and Data Logging, Consumer Appliance Control, Automotive Aftermarket Accessories, Hobby and Educational Development.
Industrial Control Panels
The PIC18F252-E/SO is well-suited for industrial control panels thanks to its Extended -40C to +125C temperature grade and 23 programmable I/O lines. Its 32 KB Flash accommodates HMI state machines and Modbus ASCII/RTU stacks, while four timers and two CCP/PWM channels handle timing and triac/SSR drive signals. Place the MCU between the 5 V logic rail and the front-panel keypad/LED matrix; the MSSP and USART interfaces connect directly to RS-485 transceivers for field-bus communication.
Được đề xuất
Small Motor and Stepper Control
The PIC18F252-E/SO can drive small DC brushed motors and unipolar stepper motors via its two CCP/PWM modules and four timers. The 40 MHz (10 MIPS) throughput is sufficient for trapezoidal commutation at moderate RPM, and the 5-channel 10-bit ADC samples back-EMF or current-sense signals directly. Drive the gates of an H-bridge such as the L293D from the CCP outputs; the 32 KB Flash holds the acceleration/deceleration profile and fault-handling routines in a single image.
Được đề xuất
Sensor Conditioning and Data Logging
With five channels of 10-bit ADC, hardware 8x8 multiplier, and 1.5 KB of RAM for circular buffers, the PIC18F252-E/SO is a strong fit for sensor-conditioning and local data-logging nodes. The MSSP port reads digital sensors via SPI or I2C, while the USART streams averaged data upstream at 115200 baud. Place the MCU between the analog front-end (e.g., instrumentation amp) and a serial-to-Ethernet bridge; the 256 bytes of EEPROM store calibration constants that survive power cycles.
Được đề xuất
Consumer Appliance Control
The PIC18F252-E/SO's Extended temperature rating and self-programming Flash make it an attractive choice for white-goods controllers such as washing-machine front panels, dishwasher timers, and microwave user interfaces. The 32 KB Flash handles user-interface state machines plus safety logic, while four timers drive triac phase-control firmware. Place the MCU near the user keypad and run the triac optocouplers from the CCP/PWM pins; the nanoWatt sleep mode keeps standby power below regulatory thresholds.
Được đề xuất
Automotive Aftermarket Accessories
Although not -AEC-Q100 qualified, the PIC18F252-E/SO's Extended -40C to +125C temperature range and robust Flash allow it to serve in aftermarket automotive accessories such as gauge controllers, lighting sequencers, and alarm interfaces. The two CCP/PWM channels drive LED current sinks and buzzer tones, while the USART links to OBD-II adapters for telemetry display. Mount the MCU on the accessory PCB with a 5 V regulator; ensure ESD protection on external connectors since the part lacks automotive EMI hardening.
Được đề xuất
Hobby and Educational Development
The PIC18F252-E/SO is widely adopted in hobbyist and university curricula because its 77-instruction set, in-circuit debugger, and 32 KB Flash let students prototype real embedded systems without a steep learning curve. Combined with a PICkit 3/4 programmer, students can program, debug, and self-reprogram the device directly on the breadboard. Use the 28-SOIC breakout board or DIP-socket adapter and you have a reusable platform for robotics, sensor-fusion demos, and capstone projects.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F252-E/SO — 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/SO | PIC18F2420-E/SO | PIC18F2520-E/SO | PIC18F2423-E/SO | PIC18F2480-E/SO | PIC18F24K20-E/SO |
|---|---|---|---|---|---|---|---|
| Package | 28-SOIC (0.295 inch) | 28-SOIC (0.295 inch) - same | 28-SOIC (0.295 inch) - same | 28-SOIC (0.295 inch) - same | 28-SOIC (0.295 inch) - same | 28-SOIC (0.295 inch) - same | 28-SOIC (0.295 inch) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 32 KB | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| RAM | 1.5 KB | 1.5 KB | 768 B | 768 B | 768 B | 768 B | 768 B |
| Max Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 64 MHz |
| Operating Temperature | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +125C (Extended) | -40C to +125C (Extended) | -40C to +125C (Extended) | -40C to +125C (Extended) |
| I/O Pins | 23 | 23 | 23 | 23 | 23 | 23 | 23 |
| Special Features | ICD, self-programming Flash | ICD, self-programming Flash | nanoWatt, ICD, self-programming | nanoWatt, ICD, self-programming | nanoWatt, internal 32 kHz OSC | CAN bus, ICD, self-programming | nanoWatt XLP, 64 MHz FOSC |
| Unit Price (qty 1) | $9.76 | approx. $9.00 | approx. $8.20 | approx. $7.60 | approx. $7.90 | approx. $8.80 | approx. $7.20 |
Bảo phân biệt quan trọng
- Extended -40C to +125C temperature grade (vsPIC18F252-I/SO)
- Larger Flash and RAM than K-series siblings (vsPIC18F24K20-E/SO)
- CAN-bus-capable drop-in not required for non-CAN designs (vsPIC18F2480-E/SO)
Ghi chú thiết kế
Power the PIC18F252-E/SO from a regulated 5.0 V or 3.3 V rail with a 100 nF decoupling capacitor within 5 mm of each VDD/VSS pair, plus a 10 uF bulk capacitor near the IC. According to the PIC18FXX2 datasheet, the part draws approximately 1.8 mA per MHz in active mode and falls to under 1 uA in sleep mode; size the regulator to handle at least 2x the active current to absorb inrush during Flash programming.
Place the 28-SOIC package so that pin 1 (MCLR) is at the top-left when the notch is up. Route the crystal traces (OSC1/OSC2) short and symmetric, with the load capacitors within 4 mm of the pins and a ground pour underneath. Keep the analog AVCC/AVSS traces (where present) short and isolated from digital switching lines, and surround the SOIC with a continuous ground plane for EMI suppression.
Do not leave the MCLR pin floating - a 10 kohm pull-up to VDD plus a diode to VDD is required for reliable reset. When using LVP (low-voltage programming) mode, ensure the PGM/ RB5 pin is not driven low at power-up, or the device will enter programming mode unintentionally. Always verify the configuration bits (oscillator, watchdog, brown-out) match your firmware startup sequence before locking the part.
For SPI buses above 5 MHz, add 33 ohm series resistors close to the SCK/SDO/SDI pins of the PIC18F252-E/SO to dampen ringing on long traces. Keep the SPI bus shorter than 100 mm or use a ground-shielded twisted pair. If the I2C bus exceeds 400 kHz, reduce the pull-up resistor value to 1 kohm and verify the rise time is below the spec to avoid intermittent NACKs.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified; for AEC-Q100 automotive applications select PIC18F4520-I/PT or PIC18F46K22-I/P from Microchip's automotive line.
