PIC18LF25K40T-I/SS - 8-Bit XLP MCU, 32KB Flash, 28-SSOP
MPN: PIC18LF25K40T-I/SS ✓ Hoạt độngPIC18LF25K40T-I/SS Tóm tắt
An 8-bit microcontroller is a programmable logic device built around an 8-bit data bus, typically used in cost-sensitive embedded applications where arithmetic performance requirements are modest but peripheral integration, low power, and deterministic I/O matter more than raw compute throughput. Within the broader embedded taxonomy, the PIC18LF25K40 sits in the PIC18 family -> 8-bit MCU category -> microcontroller -> embedded processing -> semiconductor hierarchy. The XLP technology used in this part is Microchip's branding for a set of ultra-low-power architectural features (nanoWatt XLP sleep modes, low-power Run modes, and ultra-low-power wake-up sources) targeting battery-powered designs.
Key features distinguishing this part include the ADCC with automated Capacitive Voltage Divider (CVD) support for advanced touch sensing, 36 instructions in the PIC18 instruction set, hardware CRC/SCAN for memory integrity checking, and the Peripheral Pin Select (PPS) module that allows flexible remapping of digital peripherals to I/O pins. The 28-SSOP package is approximately 7.8mm wide with a 0.65mm pitch, well-suited for hand-solderable and reflow-compatible designs.
Architecturally, the PIC18LF25K40 uses a Harvard architecture with separate program and data buses, an 8-level hardware stack, and a Multiply-Lookup table accelerator for math-intensive operations. The internal 64MHz oscillator is paired with a 16MHz instruction-cycle rate (4:1 divider), and the integrated high-speed ADC can reach up to 200ksps in 10-bit mode, enabling low-latency sensor sampling. The XLP sleep modes consume down to low nA range currents, depending on configuration - making this MCU well-suited for energy harvesting applications.
Typical applications include IoT sensor nodes, battery-powered touch interfaces, industrial control panels with CAN/eight analog inputs, low-power medical wearables, and home automation controllers. The wide 1.8V-3.6V operating range makes the part particularly suitable for direct connection to single-cell lithium or multi-cell alkaline battery stacks without a boost regulator.
When designing with this MCU, ensure the ICSP/PGD/PGC programming interface is correctly routed and that the MCLR pin has a proper pull-up to VDD for reliable reset behavior. Note that SSOP packages have moderate thermal dissipation characteristics; for designs running near 64MHz continuously, verify junction temperature under load.
Bộ thay thế dễ dàng lắp đặt cho PIC18LF25K40T-I/SS — 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 PIC18LF25K40T-I/SS (cùng hình factor và footprint) — khác nhau ở ADC, Package, DAC, Core, Program Memory (Flash).
PIC18F25K40-I/SS
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Xem tài liệu →PIC18LF25K40T-I/SS Tỷ lệ tối đa & tính chất điện
| Family | PIC18 XLP |
| Core | PIC18, 8-bit |
| Program Memory Type | Flash |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 2 KB |
| EEPROM Size | 256 bytes |
| Maximum CPU Speed | 64 MHz (16 MIPS) |
| Supply Voltage (Vdd) | 1.8 V to 3.6 V |
| ADC | 10-bit ADC with Computation (ADCC), up to 200 ksps |
| DAC | 5-bit DAC |
| Comparators | Yes (with CVD support) |
| PWM / CCP | PWM, CCP, CWG |
| Timers | HLT, WWDT, SCAN/CRC, ZCD |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Hộp | 28-SSOP |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | MSL3 (per JEDEC J-STD-020) |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC18LF25K40T-I/SS
| Chân 1 | MCLR#/Vpp/RE3 — Master Clear reset (active-low) or programming voltage; input-only pin |
| Chân 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Chân 4 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| Chân 5 | RA3/AN3 — PORTA bit 3 / analog input 3 / Vref+ |
| Chân 6 | RA4/AN4 — PORTA bit 4 / analog input 4 |
| Chân 7 | RA5/AN5 — PORTA bit 5 / analog input 5 / Vref- |
| Chân 8 | Vss — Ground reference |
| Chân 9 | RA7/OSC1 — PORTA bit 7 / oscillator input |
| Chân 10 | RA6/OSC2 — PORTA bit 6 / oscillator output |
| Chân 11 | RC0 — PORTC bit 0 |
| Chân 12 | RC1 — PORTC bit 1 |
| Chân 13 | RC2 — PORTC bit 2 |
| Chân 14 | RC3 — PORTC bit 3 |
| Chân 15 | RC4 — PORTC bit 4 / I2C SDA |
| Chân 16 | RC5 — PORTC bit 5 |
| Chân 17 | RC6 — PORTC bit 6 / UART TX |
| Chân 18 | RC7 — PORTC bit 7 / UART RX |
| Chân 19 | Vss — Ground reference |
| Chân 20 | Vdd — Positive supply (1.8V-3.6V) |
| Chân 21 | RB0/INT — PORTB bit 0 / external interrupt |
| Chân 22 | RB1 — PORTB bit 1 |
| Chân 23 | RB2 — PORTB bit 2 |
| Chân 24 | RB3 — PORTB bit 3 |
| 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
PIC18LF25K40T-I/SS phù hợp cho 6 Áp dụngs: IoT Wireless Sensor Node, Capacitive Touch User Interface, Industrial Control Panel MCU, Battery-Powered Medical Wearable, Smart Home Sensor Hub, Automotive Accessory MCU.
IoT Wireless Sensor Node
The PIC18LF25K40T-I/SS fits battery-powered IoT sensor nodes because its nanoWatt XLP sleep modes drop quiescent current into the nanoampere range while still allowing wake-on-interrupt from the integrated analog comparators and ADCC. The 1.8V-3.6V supply range supports direct operation from a single-cell Li-ion or two-cell alkaline stack without a boost converter, and the 32KB Flash comfortably holds LoRaWAN/MQTT-SN stacks alongside sensor drivers. Real-world deployments reach years of operating life on a single CR2032 coin cell when carefully duty-cycled.
Được đề xuất
Capacitive Touch User Interface
The PIC18LF25K40T-I/SS is well matched to capacitive touch interfaces because the 10-bit ADCC with Computation (ADCC) automates Capacitive Voltage Divider (CVD) measurements on standard digital I/O pins, replacing a dedicated touch IC. With ~23 I/O available and Peripheral Pin Select flexibility, a 28-SSOP board can scan 12-16 touch electrodes, drive indicator LEDs via the 5-bit DAC, and run UI firmware in 32KB Flash. mTouch code examples cut firmware time to minutes.
Được đề xuất
Industrial Control Panel MCU
Industrial control panels benefit from the PIC18LF25K40T-I/SS because its integrated peripheral set (PWM, CCP, CWG, comparators, ZCD) covers motor drivers, triac/SSRs, and analog front-ends without external glue logic. The SCAN/CRC peripheral performs periodic memory integrity checks to support IEC 61508 SIL-class firmware reliability requirements, and the -40C to +85C industrial grade supports factory-floor temperatures. Designers pair the part with isolated I/O and CAN/LIN UARTs for full machine control.
Được đề xuất
Battery-Powered Medical Wearable
Low-power medical wearables such as pulse oximeters, continuous glucose monitors, and patient thermometers favor the PIC18LF25K40T-I/SS for its combination of XLP sleep current (down to the nanoampere range), 10-bit ADCC for sensor readout, and on-chip peripherals that reduce external BOM. The 1.8V-3.6V supply accepts a single Li-ion/polymer cell directly, the 16 MIPS headroom handles DSP-style filtering for signal conditioning, and the small 28-SSOP footprint (~7.8mm x 5.3mm) suits wrist-worn designs.
Được đề xuất
Smart Home Sensor Hub
Smart home products (motion sensors, door/window contacts, occupancy detectors) deploy the PIC18LF25K40T-I/SS because XLP nanoWatt sleep drops current below the self-discharge rate of coin cells, while the 10-bit ADCC and integrated ZCD (Zero-Cross Detector) simplify AC-line sensing and PIR/pyroelectric front-end interfaces. The 32KB Flash hosts MiHome/Zigbee/Thread node stacks, and the 256B EEPROM stores calibration data and security keys.
Được đề xuất
Automotive Accessory MCU
In automotive accessories (cabin lighting, sensor-equipped phone holders, USB chargers with telemetry), the PIC18LF25K40T-I/SS provides robust peripheral integration and -40C to +85C industrial operating temperature at lower cost than full AEC-Q100 parts. For non-safety accessories, the ADC/PWM/CCP peripheral set covers PWM dimming, voltage/current sensing, and serial LEDs (WS2812). For safety roles (airbag, brake-light controllers), select the AEC-Q100 qualified PIC18F25Q43-I/SS instead.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18LF25K40T-I/SS — 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 | PIC18F25K40-I/SS | PIC18LF25K40-I/SS | PIC18LF24K40-I/SS | PIC18LF25K42-I/SS |
|---|---|---|---|---|---|
| Package | 28-SSOP (0.65mm pitch) | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Flash Memory | 32 KB | 32 KB | 32 KB | 16 KB | 64 KB |
| RAM | 2 KB | 2 KB | 2 KB | 2 KB | 4 KB |
| Supply Voltage Range | 1.8V - 3.6V (LF) | 2.3V - 5.5V (F) | 1.8V - 3.6V (LF) | 1.8V - 3.6V (LF) | 1.8V - 3.6V (LF) |
| Maximum Clock | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS |
| ADC | 10-bit ADCC, up to 200 ksps | 10-bit ADCC, up to 200 ksps | 10-bit ADCC, up to 200 ksps | 10-bit ADCC, up to 200 ksps | 10-bit ADCC, up to 200 ksps |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
Bảo phân biệt quan trọng
- ADCC with CVD hardware simplifies capacitive touch (vsPIC18LF24K40-I/SS)
- K42 upgrade doubles Flash and RAM (vsPIC18LF25K42-I/SS)
- Wide LF voltage range 1.8V-3.6V (vsPIC18F25K40-I/SS)
- Integrated CWG and ZCD reduce BOM (vsPIC18F25K22-I/SO)
Ghi chú thiết kế
Estimated: at 64MHz CPU and 3.3V supply, active current is approximately 13 mA for the PIC18LF25K40. In sleep mode (XLP), current drops to roughly 50-100 nA. For battery-operated designs, duty-cycle the MCU aggressively, exploiting the integrated ADC and comparators for sensor sampling while CPU is asleep.
Place a 100nF decoupling capacitor as close as possible to the Vdd pin (pin 20) and a 10uF bulk capacitor at the board supply input. For SSOP-28 layouts, use a guard ground trace between the ICSP PGC/PGD pins and surrounding analog signals to reduce noise injection during programming and runtime debugging.
Do not exceed the absolute maximum Vdd of 4.0V; the LF variant permanently damages if exposed to a 5V supply. Always add a series resistor on MCLR# for in-circuit programming isolation, and configure PPS (Peripheral Pin Select) carefully - misconfiguration is a common source of 'dead' GPIOs that fail to respond on first prototypes.
When routing the 32.768kHz low-power crystal for the secondary LP oscillator, keep traces short (<5mm) and surround with a ground pour to minimize capacitive loading. Incorrect crystal layout is a leading cause of RTC drift or oscillator startup failure in PIC18LF25K40 designs.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page. Industrial temperature grade -40C to +85C; for AEC-Q100 automotive requirements, select PIC18F25Q43-I/SS instead. Pb-free reflow profile per J-STD-020.
