PIC18LF252T-I/SOG - 32KB Flash 8-bit MCU 28-SOIC | Microchip
MPN: PIC18LF252T-I/SOG ✓ Hoạt độngPIC18LF252T-I/SOG Tóm tắt
An 8-bit microcontroller is a single-chip computer built around a processor with an 8-bit data path, integrated program memory (Flash/ROM), working memory (RAM), and peripherals such as timers, ADC, USART, I/O ports, and interrupt controllers. PIC18F-family MCUs from Microchip use a RISC Harvard architecture and provide up to 10 MIPS at 40 MHz, targeting embedded control in industrial, consumer, automotive, and low-power applications. Within Microchip's portfolio, PIC18LF devices sit below the standard PIC18F parts and use 'LF' to mark the wider VDD range and lower-voltage capability.
Key features of the PIC18LF252T-I/SOG include 32 KB Flash for code storage, 1.5 KB RAM, 256 bytes of data EEPROM, 23 digital I/O pins, one 8-bit and three 16-bit timers, a 10-bit ADC with up to 5 channels, a USART, an MSSP (SPI/I2C) port, two analog comparators, and a capture/compare/PWM (CCP) module. The wide 2.0–5.5 V operating range makes the part suitable for both 3.3 V and 5 V rails. The 28-SOIC wide-body package (300 mil) provides a thermally robust footprint for hand-soldered prototypes and production boards.
The PIC18LF252 architecture uses a 16-bit instruction word with 8-bit data, supporting linear memory addressing and a hardware multiplier. The nanoWatt power-management features include multiple idle and sleep modes with peripheral gating, allowing the core to consume microamp-level current in deep sleep, which is critical for battery-powered and always-on designs.
Typical applications include industrial sensor interface modules, low-power data loggers, motor-control signal conditioning, building automation controllers, and battery-powered instrumentation. The PIC18LF252T-I/SOG is also widely used as a cost-optimized main controller in HVAC thermostats, access control panels, and small consumer appliances where a CAN-less, USB-less MCU is sufficient.
When designing with the PIC18LF252T-I/SOG, ensure decoupling capacitors (typically 100 nF plus a bulk 10 µF) are placed within 5 mm of the VDD pins, and that the MCLR pin is pulled high through a 10 kΩ resistor for normal operation. MPLAB X IDE with the XC8 compiler is the recommended firmware toolchain for this family.
This page synthesizes distributor pricing, same-brand drop-in alternatives, and practical design notes not aggregated on a single datasheet or distributor page, giving engineers a one-stop reference for PIC18LF252T-I/SOG selection.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF252T-I/SOG — 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 PIC18LF252T-I/SOG (cùng hình factor và footprint) — khác nhau ở Package, Timers, ADC, Core Architecture, Program Memory (Flash).
PIC18LF252-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F252-I/SO
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Xem tài liệu →PIC18F25K22-I/SO
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Xem tài liệu →PIC18LF2520-I/SO
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Xem tài liệu →PIC18LF2423-I/SO
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Xem tài liệu →PIC18LF252T-I/SOG Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC18F (8-bit RISC Harvard) |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 1.5 KB (1536 bytes) |
| Data EEPROM | 256 bytes |
| Maximum CPU Frequency | 40 MHz |
| Operating Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 23 |
| Timers | 1 x 8-bit, 3 x 16-bit |
| ADC | 10-bit, up to 5 channels |
| Communication Peripherals | 1 x USART, 1 x MSSP (SPI/I2C) |
| PWM/CCP Modules | 1 x CCP |
| Analog Comparators | 2 |
| Hộp | 28-SOIC (wide body, 300 mil) |
| Khoảng nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant (Lead-Free) |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
Cấu hình chân PIC18LF252T-I/SOG
| Chân 1 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Chân 2 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Chân 3 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / ADC VREF- |
| Chân 4 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| Chân 5 | RA4/T0CKI/C1OUT — PORTA bit 4 / Timer0 clock / Comparator 1 output |
| Chân 6 | RA5/AN4/SS/C2OUT — PORTA bit 5 / Analog input 4 / SPI Slave Select / Comparator 2 output |
| Chân 7 | OSC1/CLKI/RA7 — Crystal oscillator input / External clock input / PORTA bit 7 |
| Chân 8 | OSC2/CLKO/RA6 — Crystal oscillator output / Clock output / PORTA bit 6 |
| Chân 9 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Chân 10 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| Chân 11 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Chân 12 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 13 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 14 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 15 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Chân 16 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Chân 17 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| Chân 18 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| Chân 19 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| Chân 20 | RB3/CCP2 — PORTB bit 3 / CCP2 alternate |
| Chân 21 | RB4 — PORTB bit 4 (interrupt-on-change) |
| Chân 22 | RB5/PGM — PORTB bit 5 / Low-voltage ICSP |
| Chân 23 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 24 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 25 | VSS — Ground reference |
| Chân 26 | VDD — Positive supply (2.0 V to 5.5 V) |
| Chân 27 | MCLR/VPP/RE3 — Master Clear reset / Programming voltage / PORTE bit 3 |
| Chân 28 | RA0/AN0 — Not connected (alternate function remap) |
Ứng dụng tiêu biểu
PIC18LF252T-I/SOG phù hợp cho 6 Áp dụngs: Industrial Sensor Interface Module, Battery-Powered Data Logger, HVAC Thermostat Controller, Building Automation Sub-Controller, Small Appliance Control Board, Access Control Panel Reader.
Industrial Sensor Interface Module
The PIC18LF252T-I/SOG fits industrial 4-20 mA and 0-10 V sensor interface boards because it integrates a 10-bit ADC with up to 5 channels, a hardware USART for RS-232/RS-485 link, and an MSSP port for SPI/I2C sensor expansion, all inside a 28-SOIC footprint that drops onto standard sensor daughtercards. Its 2.0-5.5 V VDD range lets a single design run from 3.3 V sensors or 5 V transducer rails without a level shifter, and the -40C to +85C industrial rating covers factory-floor ambient conditions. The 32 KB Flash and 1.5 KB RAM comfortably hold Modbus RTU state machines and linearization lookup tables.
Được đề xuất
Battery-Powered Data Logger
For remote data-logging designs running from 2xAA or a single LiFeS2 cell, the PIC18LF252T-I/SOG's nanoWatt technology keeps sleep current under 1 µA while leaving the ADC and WDT alive, and its 2.0 V minimum VDD lets the logger run down to battery depletion. The 32 KB Flash stores firmware plus a small FAT table, while 1.5 KB RAM buffers sensor reads between writes, and the I2C MSSP port talks to external EEPROM or FRAM for non-volatile event storage. Periodic wakeups every few seconds extend battery life to 1-2 years on a 2000 mAh cell, making it ideal for cold-chain or asset-tracking loggers.
Được đề xuất
HVAC Thermostat Controller
The PIC18LF252T-I/SOG is a strong fit for residential HVAC thermostats because it combines a 10-bit ADC for NTC temperature sensing, a CCP module for PWM-controlled relay or triac firing, and a USART for optional Wi-Fi/BLE module handoff (e.g., ESP-01) on a single 28-SOIC. The 23 digital I/O pins handle the LCD interface, keypad matrix, mode switches, and fan control outputs. The 32 KB Flash is plenty for a 7-day programmable schedule and PID loop, while the wide 2.0-5.5 V VDD tolerates 24 VAC-derived unregulated rails without brownout issues at 3.3 V.
Được đề xuất
Building Automation Sub-Controller
In a BACnet or Modbus sub-controller mounted on a 35 mm DIN rail, the PIC18LF252T-I/SOG acts as the local decision node that aggregates multiple 24 V digital inputs, drives relay outputs via the CCP/PWM module, and exposes a single RS-485 link upstream to the building automation controller. The 23 I/O pins handle typical 8-12 digital inputs and 4-8 relay outputs, leaving headroom for status LEDs and a local service port. Industrial -40C to +85C operation tolerates unheated electrical closets, and the 28-SOIC wide-body package is hand-solderable for field retrofits and engineering rebuilds.
Được đề xuất
Small Appliance Control Board
For cost-sensitive consumer appliances such as coffee makers, rice cookers, or simple washing-machine controllers, the PIC18LF252T-I/SOG delivers a complete 8-bit platform with 32 KB Flash for application code, a 10-bit ADC for sensor reading (temperature, water level), and a CCP for triac-based heating element PWM. Its 28-SOIC wide-body is forgiving for hand-assembly lines common in white-goods manufacturing, and the 2.0-5.5 V VDD range tolerates unregulated mains-derived 5 V or 3.3 V rails. Sleep currents below 1 µA keep standby power under 0.5 W for energy-star compliance.
Được đề xuất
Access Control Panel Reader
The PIC18LF252T-I/SOG forms the core of a Wiegand or OSDP access-control reader because it has a hardware USART for OSDP half-duplex RS-485, an MSSP for SPI-connected RFID/NFC modules, and enough Flash (32 KB) to hold cryptographic helpers and reader configuration. The 23 I/O pins support a 4x4 keypad, two-color LED driver lines, and a buzzer PWM output. Industrial temperature rating ensures operation in unheated vestibules or outdoor enclosures, while the 28-SOIC package survives the long product lifecycle of physical-security installations.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF252T-I/SOG — 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 | PIC18LF252-I/SO | PIC18F252-I/SO | PIC18F25K22-I/SO |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (wide, 300 mil) | 28-SOIC (wide, 300 mil) - same | 28-SOIC (wide, 300 mil) - same | 28-SOIC (wide, 300 mil) - same |
| Flash Program Memory | 32 KB | 32 KB | 32 KB | 32 KB |
| RAM | 1.5 KB | 1.5 KB | 1.5 KB | 1.5 KB |
| Max CPU Frequency | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 64 MHz / 16 MIPS |
| Operating Voltage (VDD) | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 2.3 V to 5.5 V |
| ADC | 10-bit, 5 channels | 10-bit, 5 channels | 10-bit, 5 channels | 10-bit, 14 channels |
| Communication Peripherals | 1x USART, 1x MSSP (SPI/I2C) | 1x USART, 1x MSSP | 1x USART, 1x MSSP | 2x USART, 2x MSSP, 1x CAN |
| I/O Pins | 23 | 23 | 23 | 24 |
Bảo phân biệt quan trọng
- Wide 2.0 V minimum VDD supports single-cell battery designs (vsPIC18F252-I/SO)
- Tape-and-reel packaging matches SMT production lines (vsPIC18LF252-I/SO)
- nanoWatt power-management for sub-microamp sleep (vsPIC18F25K22-I/SO)
Ghi chú thiết kế
Place a 100 nF ceramic decoupling capacitor within 5 mm of pin 26 (VDD) and a 10 µF bulk capacitor near the same node; the PIC18LF252T-I/SOG can switch I/O pins at high edge rates that inject brief VDD transients, and inadequate decoupling causes ADC noise and spurious BOR resets. Tie pin 27 (MCLR/VPP) to VDD through a 10 kΩ resistor for normal operation; never leave MCLR floating because stray injection can cause unintended resets. The wide 2.0-5.5 V range lets you run directly from a 3.3 V LDO without a separate 5 V rail, simplifying BOM.
Keep the crystal or external clock traces (pins 7 and 8) short and guarded by a ground ring to minimize EMI pickup; oscillator traces longer than 5 mm can inject harmonics into nearby analog inputs and degrade ADC accuracy. Route the analog inputs (RA0-RA5) away from digital switching lines, and keep the AGND/VSS connection at a single-point star near the IC's ground pin. If using the ADC, place a small RC filter (10 Ω + 100 nF) at each analog input to suppress switching noise from adjacent digital lines.
Do not exceed 5.5 V on VDD even momentarily: although the LF version tolerates lower VDD, the absolute maximum VDD is 5.5 V and transient overshoot from a poorly filtered supply can damage the part. Configure the Configuration Words (CONFIG1H, CONFIG2L, etc.) before the first instruction; leaving the oscillator and WDT bits at default can result in unexpected clock sources or watchdog timeouts. When migrating to PIC18F25K22-I/SO, note that some registers (especially ADC and MSSP) have different bit layouts and require firmware updates.
The PIC18LF252T-I/SOG does not include a built-in CAN or USB peripheral; if you need those interfaces, migrate to PIC18F25K22-I/SO (CAN) or PIC18F14K50-I/SO (USB) on the same 28-SOIC footprint. The I2C MSSP module requires 4.7 kΩ pull-ups on SDA/SCL for reliable operation at 400 kHz; lower pull-up values draw more current and may exceed the 25 mA sink capability of the I/O pin. For long-distance RS-485, add a 120 Ω termination at the bus ends and bias resistors to prevent false start bits when the bus is idle.
Thông tin tuân thủ
Lead-free (Pb-free) terminal finish per Microchip product page; RoHS and REACH compliant per EU directives. Industrial -40C to +85C operating temperature grade; not AEC-Q100 qualified (for automotive, choose PIC18F252-I/SO automotive variants or PIC18FxxK22 family).
