PIC18F252T-I/SO - 8-Bit 40MHz 32KB Flash MCU 28-SOIC | Microchip
MPN: PIC18F252T-I/SO ✓ Hoạt độngPIC18F252T-I/SO Tóm tắt
What is a PIC18F 8-bit microcontroller? An 8-bit MCU executes instructions on 8-bit data paths at modest clock rates (typically 10–40 MIPS) and is widely used in cost-sensitive embedded control. The PIC18F family is Microchip's enhanced PIC architecture, upwards-compatible with the PIC16C5X, PIC12CXXX, and PIC16CXX lines, and adds a C-compiler-friendly instruction set, hardware multiply, and extended peripherals while remaining RISC-based. Within Microchip's taxonomy it sits under PIC microcontroller -> 8-bit MCU -> microcontroller (MCU) -> embedded processor -> semiconductor. The PIC18F252 specifically targets mid-range applications needing A/D conversion, PWM, and serial communication without moving to a 16-bit dsPIC or 32-bit ARM Cortex part.
Key features include 32 KB (16K × 16) self-programmable Flash for in-application firmware updates, 256 bytes of EEPROM for non-volatile parameter storage, 5 channels of 10-bit ADC for sensor acquisition, a USART, MSSP (configurable as 3-wire SPI or I²C), 2 capture/compare/PWM modules for motor and lighting control, and 2 analog comparators. The wide 4.2 V–5.5 V supply range and industrial-grade -40 °C to +85 °C operating temperature suit factory-floor and automotive under-hood designs.
Architecturally, the device uses Harvard-style separate program and data buses, an 8-bit data path, a 16-bit instruction word, and CMOS FLASH technology to deliver strong code density and low dynamic power. The enhanced core adds 77 single-word instructions, hardware multiply, and a software-stack model that simplifies C compiler code generation versus legacy PIC16 designs.
Typical applications include industrial sensor conditioning, motor control with PWM-driven bridges, HVAC thermostat logic, automotive body controllers (under-hood temperature derated), USB-to-UART bridges when paired with a separate PHY, and consumer appliances requiring user-interface key-scans. The PIC18F252T-I/SO fits wherever deterministic 8-bit control, on-chip EEPROM, and modest analog integration are needed.
When designing with this MCU, choose a 4 MHz–40 MHz crystal or resonator for the primary oscillator, populate the ICSP ICD pins for in-circuit debug, and route AVSS/VDD pairs to a quiet analog ground for best ADC accuracy. Always check the latest Microchip PIC18F252 errata and DS39576 family documentation before locking production firmware.
This page consolidates verified distributor pricing, identical-footprint drop-in alternates, and engineering notes that go beyond the bare datasheet, helping procurement and design engineers evaluate the PIC18F252T-I/SO in a single view.
Bộ thay thế dễ dàng lắp đặt cho PIC18F252T-I/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 PIC18F252T-I/SO (cùng hình factor và footprint) — khác nhau ở Package, Core Architecture, ADC, Operating Temperature, RoHS Status.
PIC18F252-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F252-E/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F252T-E/SO
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F242-I/SO
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18F242T-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F252T-I/SO Tỷ lệ tối đa & tính chất điện
| Family | PIC 18F |
| Core Architecture | 8-bit PIC enhanced RISC |
| CPU Speed | 40 MHz (10 MIPS) |
| Instruction Cycle Time | 100 ns |
| Instruction Set Size | 77 single-word instructions |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data SRAM | 1536 bytes |
| Data EEPROM | 256 bytes |
| Number of I/O Pins | 23 |
| ADC | 10-bit, 5 channels |
| Supply Voltage Range | 4.2 V to 5.5 V |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 28-SOIC (Wide Body, SO) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 (per Microchip SOIC profile) |
| ROM Type | Flash |
| Communication Peripherals | USART, MSSP (SPI / I2C) |
| Timers/PWM | 2 CCP modules |
| Comparators | 2 analog comparators |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC18F252T-I/SO
| Chân 1 | MCLR/VPP/RE3 — Master Clear (reset) input or programming voltage; tied to VDD via 10 kOhm |
| Chân 2 | RA0/AN0 — Digital I/O or analog input channel 0 |
| Chân 3 | RA1/AN1 — Digital I/O or analog input channel 1 |
| Chân 4 | RA2/AN2 — Digital I/O or analog input channel 2 |
| Chân 5 | RA3/AN3/VREF+ — Digital I/O, analog input, or ADC positive reference |
| Chân 6 | RA4/T0CKI — Digital I/O or Timer0 clock input |
| Chân 7 | RA5/AN4/SS/LVDIN — Digital I/O, analog input, SPI slave select, or LVD input |
| Chân 8 | OSC1/CLKIN — Crystal oscillator input or external clock input |
| Chân 9 | OSC2/CLKOUT — Crystal oscillator output or clock output |
| Chân 10 | RC0/T1OSO/T1CKI — Digital I/O or Timer1 oscillator I/O |
| Chân 11 | RC1/T1OSI/CCP2 — Digital I/O, Timer1 oscillator input, or CCP2 |
| Chân 12 | RC2/CCP1 — Digital I/O or CCP1 (PWM/capture/compare) |
| Chân 13 | RC3/SCK/SCL — Digital I/O, MSSP SPI clock, or I2C clock |
| Chân 14 | RC4/SDI/SDA — Digital I/O, MSSP SPI data in, or I2C data |
| Chân 15 | RC5/SDO — Digital I/O or MSSP SPI data out |
| Chân 16 | RC6/TX/CK — Digital I/O or USART TX/clock |
| Chân 17 | RC7/RX/DT — Digital I/O or USART RX/data |
| Chân 18 | VSS — Digital ground |
| Chân 19 | VDD — Digital supply voltage |
| Chân 20 | RB0/INT0 — Digital I/O or external interrupt 0 |
| Chân 21 | RB1/INT1 — Digital I/O or external interrupt 1 |
| Chân 22 | RB2/INT2 — Digital I/O or external interrupt 2 |
| Chân 23 | RB3/INT3 — Digital I/O or external interrupt 3 |
| Chân 24 | RB4 — Digital I/O (interrupt-on-change) |
| Chân 25 | RB5 — Digital I/O (interrupt-on-change) |
| Chân 26 | RB6/PGC — Digital I/O or ICSP clock (programming/debug) |
| Chân 27 | RB7/PGD — Digital I/O or ICSP data (programming/debug) |
| Chân 28 | AVSS — Analog ground (tie to VSS) |
Ứng dụng tiêu biểu
PIC18F252T-I/SO phù hợp cho 7 Áp dụngs: Industrial Sensor Conditioning, HVAC Thermostat Control, Automotive Body Controller (non-safety), USB-to-UART Bridge, Consumer Appliance UI, Motor Control with PWM Bridges, Data Acquisition Front-End.
Industrial Sensor Conditioning
The PIC18F252T-I/SO's 10-bit 5-channel ADC and 23 digital I/Os make it a fit for industrial sensor-conditioning front-ends that aggregate 4–20 mA or 0–10 V analog signals and drive relays or solid-state outputs. At 10 MIPS the core can run 1 kHz control loops with margin for filtering and HMI scans. Place 100 nF decoupling on each VDD pair, route AVSS to a quiet analog ground island, and use the 256-byte EEPROM to store calibration constants in the field. Compared with a Cortex-M0 part, this design trades raw throughput for simpler IEC 60730 firmware review.
Được đề xuất
HVAC Thermostat Control
The PIC18F252T-I/SO suits 24 V-powered HVAC thermostats where the 4.2–5.5 V regulator output feeds the MCU plus a backlit LCD, keypad scanner, and triac-driven fan relay. The 2 CCP/PWM channels drive the triac optocouplers at 100 Hz to 2 kHz, while the 10-bit ADC reads NTC thermistors through a resistor divider with 0.1 % references for ±0.5 C accuracy. The 32 KB Flash accommodates scheduling, PID, and BLE passthrough stub code, and EEPROM holds setpoints across power cycles. Industrial -40 to +85 C ensures attic and basement operation.
Được đề xuất
Automotive Body Controller (non-safety)
Được đề xuất
USB-to-UART Bridge
The PIC18F252T-I/SO can implement a USB CDC-to-UART bridge when paired with an external USB transceiver or used with a software USB stack on supported device variants. The USART maps directly to RS-232/RS-485 transceivers, while the MSSP can act as an SPI debug port. 32 KB Flash accommodates the CDC stack plus command parser, and the 10 MIPS ensures <1 ms round-trip on typical 115.2 kbaud streams. EEPROM holds baud-rate and VID/PID overrides from factory provisioning.
Được đề xuất
Consumer Appliance UI
In washing machines, dishwashers, and coffee makers, the PIC18F252T-I/SO serves as the HMI controller, scanning 7-segment or TFT displays and reading capacitive or mechanical keypads. The 1536 B SRAM and 256 B EEPROM are sufficient for menu state and last-setting memory, while the 2 PWM channels vary backlight brightness and buzzer tones. The wide 4.2–5.5 V supply tolerance supports directly rectified 5 V rails without additional LDO regulators, lowering BOM cost. Industrial temperature grade covers laundry room humidity excursions.
Được đề xuất
Motor Control with PWM Bridges
The PIC18F252T-I/SO's 2 CCP/PWM modules drive brushed DC motors, small BLDC sensorless fans, or uni-polar steppers at up to 20 kHz switching frequency, with hardware dead-band via firmware sequencing. The 10-bit ADC samples back-EMF or current-sense shunts at tens of kHz to close the speed loop. 32 KB Flash hosts sensorless trapezoidal commutation tables, while EEPROM stores learned parameters between power cycles. Industrial -40 to +85 C suits outdoor fan and pump enclosures.
Được đề xuất
Data Acquisition Front-End
For low-speed multi-channel data loggers, the PIC18F252T-I/SO provides 5 multiplexed 10-bit ADC inputs plus 1 additional comparator-based channel, supporting single-ended or pseudo-differential measurements with software oversampling to reach 12-bit effective resolution. The internal 256-byte EEPROM plus external SPI Flash over MSSP forms a portable logger that streams averaged samples over UART or I2C to a host. At 1536 B SRAM the device accommodates a 256-sample buffer plus TCP/IP lite stub for gateway forwarding.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F252T-I/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 | PIC18F252-E/SO | PIC18F252T-E/SO |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (300 mil) | 28-SOIC (300 mil) - same | 28-SOIC (300 mil) - same | 28-SOIC (300 mil) - same |
| Program Flash | 32 KB | 32 KB | 32 KB | 32 KB |
| Data SRAM | 1536 B | 1536 B | 1536 B | 1536 B |
| Data EEPROM | 256 B | 256 B | 256 B | 256 B |
| Max CPU Speed | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| Temperature Range | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | -40 C to +125 C (Extended) |
| ADC Resolution | 10-bit, 5 channels | 10-bit, 5 channels | 10-bit, 5 channels | 10-bit, 5 channels |
| Shipping Medium | Tape & Reel | Tube | Tube | Tape & Reel |
Bảo phân biệt quan trọng
- Self-programmable Flash with 1536 B SRAM and 256 B EEPROM (vsPIC18F242-I/SO)
- Industrial -40 C to +85 C operating range (vsPIC18F252-E/SO)
- Tape-and-reel packaging for high-volume SMT (vsPIC18F252-I/SO (tube))
Ghi chú thiết kế
Place a 100 nF decoupling capacitor within 5 mm of each VDD/AVDD pin pair and a single 10 uF bulk capacitor at the regulator output. The PIC18F252T-I/SO draws a few mA active and low-uA in sleep; using an LDO such as the MCP1700-3002E (3.3 V) lets you hold RAM content during brief brownouts. Estimated: at 40 MHz the active current is ~15 mA per device datasheet DC characteristics; provide a regulator sized for at least 50 mA to cover in-rush and ISP programming transients.
Route the 28-SOIC land pattern as a 300-mil SOIC footprint with pin 1 dot matching the dot on the SOIC top. Keep the quartz crystal traces to OSC1/OSC2 short (<10 mm) and guard them with a ground ring to minimize EMI. Place the MCLR/VPP pull-up of 10 kOhm near the pin to ease ICSP connection. Estimated: a 2-layer 1.6 mm FR-4 board with a partial ground pour keeps EMI risk low for industrial sensor designs; for USB or switched-power designs a 4-layer stack-up is recommended.
Do not exceed the absolute maximum VDD of 7.0 V (5.5 V recommended operating maximum). The MCLR pin must never be floated; a floating MCLR can latch the device into reset inconsistently under noise. The MSSP module uses the same pins for SPI and I2C - ensure the configuration word disables unused peripherals to free the pins as GPIO. Lastly, always read the PIC18F252 device errata sheet (Microchip DS80322 family) before locking firmware; some silicon revisions have CCP/PWM or ADC-acquisition anomalies.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page. The PIC18F252T-I/SO is not AEC-Q100 qualified; for automotive designs requiring qualification, contact Microchip or select a Q-graded variant.
