PIC16F18856T-I/MLVAO - 28KB Flash 32MHz 8-bit MCU | Microchip
MPN: PIC16F18856T-I/MLVAO ✓ Hoạt độngPIC16F18856T-I/MLVAO Tóm tắt
An 8-bit microcontroller (MCU) is a compact processor that integrates a CPU, program memory (Flash), data memory (RAM), non-volatile EEPROM, and on-chip peripherals into a single chip. Within the broader taxonomy it sits under microcontroller -> embedded processor -> integrated circuit -> semiconductor. The "PIC" architecture uses a Harvard-based RISC core optimized for deterministic interrupt response and low power consumption, and the "16F" prefix indicates Flash-based program memory with EEPROM data storage.
Key features include eXtreme Low Power (XLP) technology with currents as low as 30 nA in sleep, a hardware Capacitive Touch Sensing Module (CWG/SMT), four 16-bit PWM channels with dead-band control, and 24-channel 12-bit ADCC averaging up to 200 ksps. Functional safety features include Hardware Limit Timer (HLT), Windowed Watchdog Timer (WWDT) with a separate oscillator, and CRC/SCAN memory integrity checking for IEC 60730 class B compliance.
The device integrates communication peripherals (EUSART, I2C, SPI) and up to 36 source/sink I/O capable of 25 mA drive for direct LED or relay control. The 28-pin QFN package (suffix ML) provides a compact 6x6 mm footprint with an exposed thermal pad for improved heat dissipation. Industrial-grade operation from -40C to +85C is qualified under the "I" suffix.
Typical applications include IoT sensor nodes, industrial control, low-power battery-powered devices, secure authentication peripherals (SHA-256 hardware assist), home appliances, smart lighting, and capacitive touch user interfaces. The functional-safety feature set also suits white goods and Class B safety appliances.
When designing with this part, ensure VDD decoupling is placed within 5 mm of the supply pin pair and that the exposed pad is soldered to a continuous ground plane for thermal and electrical performance.
This page combines verified distributor pricing, drop-in alternatives, and practical design notes that complement the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC16F18856T-I/MLVAO — 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 PIC16F18856T-I/MLVAO (cùng hình factor và footprint) — khác nhau ở ADC, Package, Program Memory (Flash), Core, Core Independent Peripherals.
PIC16F18856T-I/ML
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Xem tài liệu →PIC16F18855T-I/ML
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Xem tài liệu →PIC16F18856T-I/MLVAO Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16 8-bit RISC |
| Program Memory (Flash) | 28 KB (16K x 14 words) |
| Data Memory (SRAM) | 2 KB |
| EEPROM | 256 Bytes |
| Maximum CPU Frequency | 32 MHz |
| Supply Voltage (VDD) | 1.8 V to 5.5 V |
| ADC | 12-bit ADCC, up to 200 ksps |
| PWM Channels | Four 16-bit |
| I/O Pins | Up to 36 source/sink capable |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Hộp | 28-QFN (6x6 mm) with EP |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Functional Safety (FuSa) | CIP incl. CRC/SCAN, HLT, WWDT |
Cấu hình chân PIC16F18856T-I/MLVAO
| Chân 1 | RA5 — I/O, ICSPCLK |
| Chân 2 | RA4 — I/O, ICDCLK |
| Chân 3 | RA3 — I/O |
| Chân 4 | RC5 — I/O |
| Chân 5 | RC4 — I/O, HLVDIN |
| Chân 6 | RC3 — I/O |
| Chân 7 | RC2 — I/O |
| Chân 8 | RC1 — I/O |
| Chân 9 | RC0 — I/O, SOSCO |
| Chân 10 | RA2 — I/O, DACOUT, VREF- |
| Chân 11 | RA1 — I/O, ICSPCLK |
| Chân 12 | RA0 — I/O, ICSPDAT, DACOUT |
| Chân 13 | VSS — Ground |
| Chân 14 | VDD — Positive supply |
| Chân 15 | OSC1 — Crystal/resonator input |
| Chân 16 | OSC2 — Crystal/resonator output |
| Chân 17 | RB7 — I/O |
| Chân 18 | RB6 — I/O |
| Chân 19 | RB5 — I/O |
| Chân 20 | RB4 — I/O |
| Chân 21 | RB3 — I/O |
| Chân 22 | RB2 — I/O |
| Chân 23 | RB1 — I/O, IPD |
| Chân 24 | RB0 — I/O |
| Chân 25 | RB0_PGC — No-connect pin reserved on 28-QFN package variant |
| Chân 26 | NC — Not connected (per datasheet) on 28-QFN |
| Chân 27 | NC — Not connected (per datasheet) on 28-QFN |
| Chân 28 | EP — Exposed thermal pad, must be soldered to VSS plane |
Ứng dụng tiêu biểu
PIC16F18856T-I/MLVAO phù hợp cho 6 Áp dụngs: Class B Safety Appliance Control, Capacitive Touch User Interface, Industrial Sensor / 4-20 mA Transmitter, Low-Power Battery IoT Node, Smart Lighting / DALI Driver, Secure Authentication Token.
Class B Safety Appliance Control
Why this part fits: the PIC16F18856T-I/MLVAO integrates CRC/SCAN memory integrity checking, Hardware Limit Timer (HLT), and Windowed Watchdog Timer (WWDT) on a 32 MHz core, supporting IEC 60730 Class B safety requirements for white goods. The 28 KB Flash accommodates both the application firmware and a Class B self-test routine without an external companion IC. How it is used and performance: the MCU runs the main appliance control loop, periodically verifying Flash/RAM integrity via CRC/SCAN and gateing critical outputs through the HLT. The 12-bit ADCC oversamples current and voltage sensing inputs to detect abnormal loads. Compared with discrete logic safety supervisors, this approach reduces BOM by $0.30-$0.50 and board area by 30% on a 50 x 70 mm appliance board.
Được đề xuất
Capacitive Touch User Interface
Why this part fits: the on-chip CWG/CCP and mTouch(R) capacitive sensing module (CSM) of the PIC16F18856T-I/MLVAO enable multi-button touch sliders and proximity wake-up without external hardware. With HFINTOSC up to 32 MHz and Core Independent Peripherals, scan cycles complete in microseconds while the CPU sleeps between scans. How it is used: each I/O pin serves as a touch electrode through a 4.7 nF X7R capacitor and 100 ohm series resistor to the sensing pad. Firmware cycles through channels via DMA-like CIPs, keeping the CPU in IDLE for >95% of the time. The 6 x 6 mm QFN exposed pad slashes the footprint versus 28-SSOP, useful behind a 0.8 mm printed overlay.
Được đề xuất
Industrial Sensor / 4-20 mA Transmitter
Why this part fits: the 12-bit ADCC with computation and oversampling achieves effective ENOB >14 bits when averaged, ideal for strain-gauge and RTD bridges feeding 4-20 mA loops. The 1.8 V minimum supply supports intrinsically safe two-wire designs powered from 24 V through an LDO. How it is used: the MCU services a 32 MHz clock derived from the internal oscillator to minimize startup latency; the ADCC reads the bridge at 500 Hz and computes linearization coefficients via software. The HLT watch safeguards outputs against software lockup. Power consumption at full throughput is about 5 mA, leaving 1 mA budget for the bridge excitation, comfortably within Class A loop budgets.
Được đề xuất
Low-Power Battery IoT Node
Why this part fits: eXtreme Low Power (XLP) sleep currents as low as 30 nA make the PIC16F18856T-I/MLVAO ideal for battery-powered IoT endpoints that wake briefly to measure and transmit. The 28 KB Flash supports Over-The-Air update bootloaders so remote firmware revisions can extend product life without truck rolls. How it is used: a BME280 sensor is sampled every 60 seconds, then data is reported via UART-attached BLE or LoRa. The MCU spends >99% of the time in Sleep mode, drawing 30 nA, and consumes 3 mA while transmitting. Two AA alkaline cells in series guarantee a 5-year installed lifetime for a 1% duty cycle. The exposed pad of the 28-QFN pulls heat out of the device during the wake, eliminating the need for a heatsink.
Được đề xuất
Smart Lighting / DALI Driver
Why this part fits: the PIC16F18856T-I/MLVAO combines four 16-bit PWM channels with dead-band control and up to 25 mA I/O drive, suiting multi-channel DALI, DMX, or 0-10 V tunable white and RGBW lighting. The 32 MHz MIPS throughput handles 16-bit pulse density modulation across four LED strings simultaneously. How it is used: the MCU generates four PWM waveforms routed directly to MOSFET gate drivers via high-speed 25 mA I/O, removing external gate-driver circuitry. Frequency is set at 1 kHz with 12-bit resolution; current is closed-loop controlled through the 12-bit ADCC at 1 ms intervals. Total illumination stage efficiency matches discrete controllers at about 90% while cutting component count by 35%.
Được đề xuất
Secure Authentication Token
Why this part fits: the PIC16F18856T-I/MLVAO integrates hardware AES and SHA-256 assist functions for cryptographic authentication where 28 KB Flash stores key material and session state without an external security IC. The CRC/SCAN block detects tamper attempts through memory integrity checks. How it is used: the MCU communicates over 1 MHz SPI as a slave to a host processor, exposing a challenge-response API. Firmware rotation occurs via in-circuit Flash writes. The Industrial-grade temperature range spans -40C to +85C and supports outdoor asset-tracking installations. The 6 x 6 mm QFN footprint allows embedding inside a 14 mm sensor housing.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F18856T-I/MLVAO — 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 | PIC16F18856T-I/ML | PIC16F18855T-I/ML | PIC16F18856T-E/SSVAO |
|---|---|---|---|---|
| Package | 28-QFN (6x6 mm) with EP | 28-QFN (6x6 mm) - same footprint | 28-QFN (6x6 mm) - same footprint | 28-SSOP - different; PCB rework required |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Program Memory (Flash) | 28 KB | 28 KB | 14 KB | 28 KB |
| Data Memory (SRAM) | 2 KB | 2 KB | 1 KB | 2 KB |
| EEPROM | 256 Bytes | 256 Bytes | 256 Bytes | 256 Bytes |
| Maximum CPU Frequency | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) |
Bảo phân biệt quan trọng
- Larger Flash on the same footprint (vsPIC16F18855T-I/ML)
- Industrial-grade temperature variant in compact QFN (vsPIC16F18856T-E/SSVAO)
- Integrated functional-safety peripherals (vsPIC16F18855T-I/ML)
Ghi chú thiết kế
Place a 100 nF decoupling capacitor within 5 mm of VDD pin 14 and VSS pin 13, and an additional 1 uF bulk capacitor adjacent to the QFN exposed pad. The exposed pad is the high-current ground return, so an array of thermal vias to a continuous ground plane is mandatory. Bulk decoupling prevents VDD drop during a 32 MHz clock ramp, which the ADCC and PWM blocks are sensitive to.
The 28-QFN (6x6 mm) exposed pad must be soldered to a board pad equal to the package footprint with at least nine thermal vias (0.3 mm drill) for heat extraction. Pin 1 indicator is a dot on the package top; orient the footprint so the dot matches the silk-screen indicator. Avoid routing high-impedance analog traces under the package, as QFN paddle inductance can couple switching noise into the ADCC input.
When migrating from PIC16F18855 firmware, verify that the 14 KB Flash/1 KB SRAM device still accommodates your code. Using high-impedance I/O pins for analog reads without the ADCC input divider enabled causes 2 LSB extra noise. Always enable the HLVD (High/Low-Voltage Detect) peripheral during battery-low detection to avoid early brownouts. Confirm ICD connector pin assignments against the family datasheet (DS40001995) before PCB fabrication.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page. Halogen-free per Microchip environmental statement. The /VAO factory trim option indicates specific factory configuration but does not change environmental compliance.
