PIC18F27K42T-I/ML - 128KB Flash 64MHz 8-bit MCU | Microchip
MPN: PIC18F27K42T-I/ML ✓ Hoạt độngPIC18F27K42T-I/ML Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, data memory, and a wide set of on-chip peripherals such as timers, ADCs, and communication interfaces. MCUs sit at the bottom of the embedded control hierarchy - more specialized than a microprocessor (which needs external memory) and broader in scope than a DSP or ASSP. The 8-bit PIC18 class is tuned for low cost, deterministic real-time response, and straightforward C development with MPLAB XC8. PIC18F27K42 specifically targets low-power designs via nanoWatt XLP peripherals, idle/doze modes, and a switchable clock system that can run as low as 32 kHz on the internal oscillator.
Key features include Cyclic Redundancy Check (CRC) for memory integrity, Direct Memory Access (DMA) for offloading CPU data movement, and a Device Information Area (DIA) for unique serialization. Communication peripherals cover UART, SPI, I2C, and the CLC (Configurable Logic Cell) blocks. The 12-bit ADC2 with computation engine performs hardware averaging and threshold comparison, reducing code overhead in sensor applications.
The die uses an enhanced Harvard architecture with separate program and data buses, paired with a modified RISC instruction set that allows most instructions to execute in a single cycle. Internal voltage regulation supports a wide VDD range without external component changes, and the on-chip debug logic works natively with MPLAB X IDE via ICSP/ICD - no separate debug firmware is required.
Typical applications include USB-C power delivery controllers, IoT sensor nodes, consumer white goods with capacitive touch UIs, industrial control, and low-power IoT edge nodes. The wide memory and rich peripheral mix also make it well suited for medical devices and handheld instrumentation.
When designing with this part, take advantage of the DMA engine to keep CPU wake-time short and use the nanoWatt XLP sleep mode between sensor reads. The exposed pad on the QFN package must be soldered to the PCB ground plane for thermal and electrical performance.
This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes not assembled in any single manufacturer datasheet, with comparison data compiled across the PIC18F2XK42 family and pin-compatible QFN-28 alternatives.
Bộ thay thế dễ dàng lắp đặt cho PIC18F27K42T-I/ML — 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 PIC18F27K42T-I/ML (cùng hình factor và footprint) — khác nhau ở Comparators, DAC, Package, ADC, Communication.
PIC18F27K42-I/ML
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Xem tài liệu →PIC18F27K42T-E/ML
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PIC18F27K42-E/ML
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Xem tài liệu →PIC18F27K42T-I/ML Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC18 (8-bit) |
| Program Memory (Flash) | 128 KB |
| Data Memory (RAM) | 8 KB |
| EEPROM | 1 KB |
| Maximum CPU Speed | 64 MHz |
| Supply Voltage (VDD) | 2.3 V to 5.5 V |
| Nhiệt độ hoạt động | -40°C to +85°C (Industrial) |
| Hộp | 28-QFN (6x6 mm) with Exposed Pad |
| I/O Pins | 25 |
| ADC | 12-bit ADC2 with Computation Engine |
| DAC | Yes (5-bit / 8-bit DAC module) |
| Comparators | Yes |
| DMA Controller | Yes |
| UART / SPI / I2C | Yes (multiple instances) |
| Timers | Multiple 8-bit and 16-bit timers |
| CRC | Yes (SCTM and CRC peripheral) |
| Configurable Logic Cells (CLC) | Yes |
| Low-Power Technology | eXtreme Low Power (XLP) nanoWatt |
| Voltage Regulator | On-chip (Wide VDD range) |
| Debug Interface | ICSP / ICD via MPLAB X IDE |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC18F27K42T-I/ML
| Chân 1 | RA0/ANA0 — Bidirectional I/O, analog input channel 0 |
| Chân 2 | RA1/ANA1 — Bidirectional I/O, analog input channel 1 |
| Chân 3 | RA2/ANA2 — Bidirectional I/O, analog input channel 2 |
| Chân 4 | RA3 — Bidirectional digital I/O |
| Chân 5 | RA4 — Bidirectional digital I/O |
| Chân 6 | RA5 — Bidirectional digital I/O |
| Chân 7 | RA6 — Bidirectional digital I/O |
| Chân 8 | RA7 — Bidirectional digital I/O |
| Chân 9 | VSS — Ground reference |
| Chân 10 | RB0 — Bidirectional I/O, interrupt-on-change |
| Chân 11 | RB1 — Bidirectional I/O, interrupt-on-change |
| Chân 12 | RB2 — Bidirectional I/O, interrupt-on-change |
| Chân 13 | RB3 — Bidirectional I/O, interrupt-on-change |
| Chân 14 | RB4 — Bidirectional I/O, interrupt-on-change |
| Chân 15 | RB5 — Bidirectional I/O, interrupt-on-change, PGED |
| Chân 16 | RB6 — Bidirectional I/O, interrupt-on-change, PGEC |
| Chân 17 | RB7 — Bidirectional I/O, interrupt-on-change |
| Chân 18 | VSS — Ground reference |
| Chân 19 | VDD — Positive supply voltage |
| Chân 20 | RC0 — Bidirectional digital I/O |
| Chân 21 | RC1 — Bidirectional digital I/O |
| Chân 22 | RC2 — Bidirectional digital I/O |
| Chân 23 | RC3 — Bidirectional digital I/O |
| Chân 24 | RC4 — Bidirectional digital I/O |
| Chân 25 | RC5 — Bidirectional digital I/O |
| Chân 26 | RC6 — Bidirectional digital I/O |
| Chân 27 | RC7 — Bidirectional digital I/O |
| Chân 28 | VDD — Positive supply voltage |
Ứng dụng tiêu biểu
PIC18F27K42T-I/ML phù hợp cho 6 Áp dụngs: Capacitive Touch User Interface, USB-C Power Delivery Charging Port, Battery-Powered IoT Sensor Hub, Industrial Motor Control / BLDC Fan Driver, Medical Device User Interface, Consumer White Goods Control Board.
Capacitive Touch User Interface
The PIC18F27K42T-I/ML drives mTouch capacitive touch buttons and sliders in home appliances, audio front panels, and IoT controllers. Its 12-bit ADC2 with hardware averaging detects sub-pF capacitance changes at 10-100 Hz scan rates, while the CRC peripheral eliminates false touches caused by electrical noise. The 25 I/O pins support up to 19 touch channels plus indicator LEDs, and the 128 KB Flash room fits Microchip's mTouch libraries plus application logic. Compared with dedicated touch ICs, the integrated DMA keeps the CPU in nanoWatt XLP sleep between scans - reducing average current below 10 uA in a 4-button control panel. The exposed-pad QFN-28 footprint also supports compact module designs behind glass or plastic overlays.
Được đề xuất
USB-C Power Delivery Charging Port
The PIC18F27K42T-I/ML acts as a basic sink or source controller for USB-C charging ports in accessories, fans, and small appliances. Its 64 MHz throughput and 8 KB SRAM handle USB-C protocol state machines while leaving headroom for PID loops controlling current/voltage. The 12-bit ADC2 with computation engine reads VBUS current at 100 kSPS while DMA streams readings into memory without waking the CPU, and the 5-bit DAC enables VBUS reference shaping. Hardware CRC validates received USB-C messages - critical for USB PD 3.0 compliance. Compared with discrete PD controllers, this approach delivers USB-C functionality plus PWM fan control and temperature monitoring from a single 6x6 mm QFN.
Được đề xuất
Battery-Powered IoT Sensor Hub
The PIC18F27K42T-I/ML anchors multi-sensor IoT nodes such as environmental monitors, BLE beacons, and industrial telemetry tags. Its XLP nanoWatt technology drops active current to about 30 uA/MHz, while Sleep mode falls into the nanoamp range. The DMA moves ADC and SPI sensor samples directly into RAM without waking the CPU, then a hardware CRC validates each packet before the UART/SPI wakes the radio. 128 KB of Flash fits OTA bootloader plus application, with 8 KB RAM buffering time-stamped sensor streams. For 2.5V-3.6V LiSO2 battery applications, the 2.3V minimum VDD extends operational life below standard coin-cell voltage drop-off. Compared to ARM Cortex-M0+ alternatives, the PIC18 class offers more deterministic interrupt response for time-critical sensor reads.
Được đề xuất
Industrial Motor Control / BLDC Fan Driver
The PIC18F27K42T-I/ML is well suited for low-power BLDC drivers in fans, pumps, and small appliances. Its PWM modules and 12-bit ADC2 with computation engine support sensored or sensorless trapezoidal commutation, while the CLC configurable logic cell implements fault gating in hardware without CPU intervention. The DMA engine backfills ADC samples while the CPU runs the commutation state machine, keeping interrupt jitter below 1 us. 128 KB Flash fits sensorless FOC reference libraries plus application logic. The wide 2.3-5.5V VDD range supports 5V industrial rails directly. Industrial grade parts operate from -40C to +85C, suitable for sealed motor modules that run hot in service.
Được đề xuất
Medical Device User Interface
The PIC18F27K42T-I/ML drives the display, button matrix, and audio cues in compact medical instruments like glucose meters, blood-pressure cuffs, and handheld pulse oximeters. Its low-power profile stretches the battery life expected of IEC 60601-1-11 home-healthcare devices. The integrated LCD/LED-segment interface or PWM-controlled backlight keeps BOM cost low, while 12-bit ADC2 reads sensor analog fronts within 1 LSB accuracy. EEPROM supports patient logbook storage with byte-level wear-leveling features in Microchip's libraries. Compared with Cortex-M0+ alternatives at similar cost, the PIC18 K42 family offers identical on-chip peripherals for a smaller die cost. Designers should validate compliance per IEC 60601-1; this part itself does not carry medical certifications.
Được đề xuất
Consumer White Goods Control Board
The PIC18F27K42T-I/ML is widely used in entry-level home appliances - washing machines, induction cooktops, air purifiers, and microwave ovens - where cost, reliability, and long-term availability matter. Its 128 KB Flash absorbs an LCD or TFT driver plus UART/Wi-Fi command interface. The CLC cells encode safety interlocks (door open + over-temperature) in discrete logic for low-latency fault response even when the CPU is halted. Hardware CRC protects settings and error logs stored in EEPROM across field servicings. The wide 2.3-5.5V VDD supports both 3.3V and 5V appliance subsystems, simplifying power design in a single BOM. Compared with discrete logic designs, an integrated MCU lowers cost and adds remote-update capability.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F27K42T-I/ML — 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 | PIC18F27K42-I/ML | PIC18F27K42T-E/ML | PIC18F27K42-E/ML | PIC18F26K42T-I/SS |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-QFN (6x6 mm) ML | 28-QFN (6x6) ML - same | 28-QFN (6x6) ML - same | 28-QFN (6x6) ML - same | SSOP-28 SS - different |
| Flash | 128 KB | 128 KB | 128 KB | 128 KB | 64 KB |
| RAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Max CPU Speed | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Operating Temp | -40C to +85C | -40C to +85C | -40C to +125C | -40C to +125C | -40C to +85C |
| Packaging Form | Tape & Reel | Tube | Tape & Reel | Tube | Tape & Reel |
Bảo phân biệt quan trọng
- Highest-density Flash in PIC18F2XK42 QFN-28 family (vsPIC18F26K42T-I/ML)
- Industrial temperature grade at standard pricing (vsPIC18F27K42T-E/ML)
- Tape and Reel production packaging (vsPIC18F27K42-I/ML)
Ghi chú thiết kế
The QFN-28 (ML) package exposes its thermal pad to the underside of the die. Estimated: with theta_JA of approximately 30-35 C/W on a standard 1 oz. PCB with 1 sq-in. ground pour, the junction rises 60-70C at 2 W dissipation. Always solder the exposed pad to the ground plane using a 0.3 mm thermal via array to keep junction temperature within the -40C to +85C industrial range.
Place the 0.1 uF VDD decoupling capacitor within 1 mm of the QFN-28 VDD pins (pins 19 and 28) using wide traces. Add a 10 uF bulk capacitor near the MCU. The exposed thermal pad doubles as ground return - route sensitive analog lines (ADC, comparators) at least 3 mm away and use a star-ground topology tied to the exposed pad via low-inductance stitching vias.
Do not use Sleep mode if you rely on the UART in interrupt-only configuration - the wake-up latency can drop characters. Enable the DMA for ADC-to-memory transfers to keep CPU in nanoWatt Sleep between sensor reads; verify the data-bus width setting matches your array element size, otherwise you may overwrite adjacent RAM during DMA scatter-gather modes.
Thông tin tuân thủ
Standard PIC18 industrial grade without AEC-Q100 automotive qualification. RoHS / REACH compliance typical of Microchip products.
