PIC16LF874A-I/ML - 8-bit MCU, 7KB Flash, 33 I/O | Microchip
MPN: PIC16LF874A-I/ML ✓ Hoạt độngPIC16LF874A-I/ML Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash/ROM), data memory (RAM), and peripherals onto one silicon die. Within the broader taxonomy, the PIC16LF874A belongs to the 8-bit MCU -> microcontroller -> embedded controller -> semiconductor hierarchy. The 'LF' prefix denotes the low-voltage, low-power process variant that operates across an extended 2.0V to 5.5V range, making it well-suited to battery-powered or energy-harvesting designs.
Key differentiating features of the PIC16LF874A include its 35 single-word instruction RISC architecture, self-programming capability, in-circuit debugging (ICD) support, and 10 MIPS sustained throughput. The 44-pin QFN (ML) package offers a small 8x8 mm footprint with an exposed thermal pad that improves power dissipation versus leaded PLCC packages, while remaining compatible with the PIC16F874A pinout (differing only in core voltage range).
The device uses a Harvard architecture with separate program and data memory buses, enabling simultaneous instruction fetch and operand access. The enhanced core adds 14-bit instructions, hardware multiplier support (via software libraries), interrupt handling with shadow registers, and a wide peripheral set including the Enhanced USART and MSSP peripheral for SPI and I2C communications.
Typical applications include industrial control panels, sensor signal conditioning, low-power remote sensor nodes, motor control loops with feedback sensing, and consumer appliance user interfaces. The 10-bit ADC with 8 input channels makes it a fit for analog sensor reading systems. Consider whether legacy 5V systems should use the PIC16F874A variant instead, while the LF suffix guarantees operation down to 2.0V for newer low-voltage designs.
When designing with this device, ensure the exposed pad (EP) is soldered to the ground plane for proper thermal performance and that the configuration bits are correctly set for the chosen oscillator mode. Programming via ICSP requires Vpp, ICSPCLK, and ICSPDAT access on dedicated pins.
Bộ thay thế dễ dàng lắp đặt cho PIC16LF874A-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 PIC16LF874A-I/ML (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Package, Program Memory (Flash), Timers, ADC.
PIC16LF877A-I/ML
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| Product Family | PIC16F/LF87xA |
| Core Architecture | 8-bit PIC16 Enhanced Mid-range |
| Program Memory (Flash) | 7 KB (4K x 14 words) |
| RAM Size | 192 bytes |
| EEPROM Size | 128 bytes |
| Maximum CPU Speed | 20 MHz (200 ns instruction cycle, 10 MIPS) |
| Operating Voltage | 2.0 V to 5.5 V (LF low-voltage variant) |
| I/O Pins | 33 |
| ADC | 10-bit, up to 8 channels |
| Comparators | 2 analog comparators |
| Timers | Timer0, Timer1, Timer2 |
| CCP/PWM Modules | 2 CCP modules |
| Communication | 1x USART (AUSART), 1x MSSP (SPI/I2C) |
| Hộp / Vỏ | 44-QFN with exposed pad (ML), 8x8 mm |
| Nhiệt độ hoạt động | -40C to +85C (industrial grade, '-I') |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC16LF874A-I/ML
| Chân 1 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Chân 2 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Chân 3 | RA2/AN2/VREF- — Digital I/O / Analog input channel 2 / ADC negative reference |
| Chân 4 | RA3/AN3/VREF+ — Digital I/O / Analog input channel 3 / ADC positive reference |
| Chân 5 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Chân 6 | RA5/AN4/SS — Digital I/O / Analog input channel 4 / SPI slave select |
| Chân 7 | OSC1/CLKI — Crystal oscillator input / external clock input |
| Chân 8 | OSC2/CLKO — Crystal oscillator output / clock output |
| Chân 9 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / Timer1 clock input |
| Chân 10 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 |
| Chân 11 | RC2/CCP1 — Digital I/O / CCP1 |
| Chân 12 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Chân 13 | RD0/PSP0 — Digital I/O / Parallel Slave Port bit 0 |
| Chân 14 | RD1/PSP1 — Digital I/O / Parallel Slave Port bit 1 |
| Chân 15 | RD2/PSP2 — Digital I/O / Parallel Slave Port bit 2 |
| Chân 16 | RD3/PSP3 — Digital I/O / Parallel Slave Port bit 3 |
| Chân 17 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Chân 18 | RC5/SDO — Digital I/O / SPI data out |
| Chân 19 | RC6/TX/CK — Digital I/O / USART async transmit / USART sync clock |
| Chân 20 | RC7/RX/DT — Digital I/O / USART async receive / USART sync data |
| Chân 21 | GND — Ground reference |
| Chân 22 | VDD — Positive supply voltage |
| Chân 23 | RB0/INT — Digital I/O / External interrupt input |
| Chân 24 | RB1 — Digital I/O |
| Chân 25 | RB2 — Digital I/O |
| Chân 26 | RB3/PGM — Digital I/O / Low-voltage ICSP programming |
| Chân 27 | RB4 — Digital I/O |
| Chân 28 | RB5 — Digital I/O |
| Chân 29 | RB6/PGC — Digital I/O / ICSP clock |
| Chân 30 | RB7/PGD — Digital I/O / ICSP data |
| Chân 31 | GND — Ground reference (second tie point) |
| Chân 32 | VDD — Positive supply voltage (second tie point) |
| Chân 33 | RB8 — Digital I/O (Port B extended) |
| Chân 34 | RB9 — Digital I/O (Port B extended) |
| Chân 35 | RB10 — Digital I/O (Port B extended) |
| Chân 36 | RB11 — Digital I/O (Port B extended) |
| Chân 37 | RB12 — Digital I/O (Port B extended) |
| Chân 38 | RB13 — Digital I/O (Port B extended) |
| Chân 39 | RB14 — Digital I/O (Port B extended) |
| Chân 40 | RB15 — Digital I/O (Port B extended) |
| Chân 41 | RC2 — Digital I/O (Port C secondary) |
| Chân 42 | RD4/PSP4 — Digital I/O / Parallel Slave Port bit 4 |
| Chân 43 | RD5/PSP5 — Digital I/O / Parallel Slave Port bit 5 |
| Chân 44 | RE0/RD/AN5 — Digital I/O / Parallel Slave Port read / Analog input channel 5 |
| Chân EP | EP — Exposed thermal pad - must be soldered to ground plane (per datasheet) |
Ứng dụng tiêu biểu
PIC16LF874A-I/ML phù hợp cho 6 Áp dụngs: Industrial Control Panels, Low-Power Remote Sensor Nodes, Consumer Appliance User Interfaces, Motor Control with Feedback Sensing, Automotive Body Electronics (Non-Safety), Educational and Hobbyist Development.
Industrial Control Panels
The PIC16LF874A-I/ML fits industrial control panel designs thanks to its 33 I/O pins, 2.0V-5.5V operation, and 10 MIPS core speed. Its wide voltage tolerance tolerates noisy 24V-derived rails stepped down to 5V or 3.3V, while the 7 KB flash accommodates multi-state machine logic. The 10-bit ADC with 8 channels reads panel potentiometers and sensor inputs directly. The QFN-44 package with exposed pad simplifies thermal management in sealed enclosures.
Được đề xuất
Low-Power Remote Sensor Nodes
The PIC16LF874A-I/ML is a strong fit for battery-powered remote sensor nodes because the LF process variant operates down to 2.0V, enabling 2xAA battery operation near end-of-life. Its 7 KB flash stores sensor calibration tables and wake-on-interrupt logic, while the 10-bit ADC handles temperature, pressure, or humidity sensor reads. The MSSP peripheral supports I2C sensor interfacing, and the USART provides optional LoRa/BLE module connectivity for remote telemetry.
Được đề xuất
Consumer Appliance User Interfaces
The PIC16LF874A-I/ML powers user interfaces in consumer appliances such as washing machines, microwave ovens, and HVAC thermostats. Its 33 I/O drive 7-segment displays, keypads, and indicator LEDs directly without external glue logic. The 2 CCP/PWM modules generate beeper tones and triac-fired heater control. The 7 KB flash fits menu state machines and EEPROM-backed user settings, while the 2.0V-5.5V range supports single-cell lithium backup during power brown-outs.
Được đề xuất
Motor Control with Feedback Sensing
The PIC16LF874A-I/ML implements closed-loop DC motor control using its 2 CCP/PWM modules for H-bridge drive signals and its 10-bit ADC for back-EMF or current-sense feedback. The 35-instruction enhanced mid-range core executes 10 MIPS, enough for PID loops at 1 kHz control rates. The 2 analog comparators provide hardware overcurrent protection, while the USART exposes telemetry to a host controller. The QFN package handles modest thermal loads in compact motor driver PCBs.
Được đề xuất
Automotive Body Electronics (Non-Safety)
The PIC16LF874A-I/ML serves non-safety automotive body modules such as interior lighting controllers, seat-position memory, and accessory multiplexers. Its -40C to +85C industrial temperature rating meets cabin environments, and the 33 I/O handle multiple LED strings and switch inputs. The MSSP supports LIN slave emulation via software for low-speed body networking. Note that AEC-Q100 qualified variants should be selected for production automotive deployments; the standard part suits prototyping.
Được đề xuất
Educational and Hobbyist Development
The PIC16LF874A-I/ML is well-suited to educational microcontroller coursework and hobbyist projects owing to its mature toolchain support (MPLAB X IDE, XC8 compiler, PICkit debugger). The 7 KB flash and 192 bytes RAM accommodate typical student assignments such as digital thermometers, line-following robots, and data loggers. The 44-QFN package challenges beginners with surface-mount soldering but rewards design with a compact breakout; the same die in DIP-40 (PIC16LF874A-I/P) is easier for breadboard prototyping.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LF874A-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 | PIC16LF877A-I/ML | PIC16F874A-I/ML | PIC16LF874A-I/L | PIC16LF874A-I/PT | PIC16LF874A-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (ML), 8x8 mm | 44-QFN (ML), 8x8 mm - same | 44-QFN (ML), 8x8 mm - same | 44-LCC/PLCC, J-Lead - different | 44-TQFP, 10x10 mm - different | 40-DIP - different |
| Program Memory (Flash) | 7 KB (4K x 14) | 14 KB (8K x 14) +100% | 7 KB (same) | 7 KB (same) | 7 KB (same) | 7 KB (same) |
| RAM Size | 192 bytes | 368 bytes +92% | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.0 V to 5.5 V - narrower | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| I/O Pins | 33 | 40 +21% | 33 | 33 | 33 | 33 |
| ADC Channels | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit |
| Maximum Speed | 20 MHz / 10 MIPS | 20 MHz / 10 MIPS | 20 MHz / 10 MIPS | 20 MHz / 10 MIPS | 20 MHz / 10 MIPS | 20 MHz / 10 MIPS |
| RoHS Compliance | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Bảo phân biệt quan trọng
- Wide 2.0V-5.5V operating voltage for low-voltage and battery designs (vsPIC16F874A-I/ML)
- Larger flash and more I/O available in same QFN-44 package (vsPIC16LF877A-I/ML)
- Surface-mount QFN footprint with exposed thermal pad (vsPIC16LF874A-I/P (DIP-40))
- Enhanced mid-range core with hardware multiplier-friendly instruction set (vsBaseline PIC16C7x)
Ghi chú thiết kế
The 44-QFN (ML) package has an exposed thermal pad (EP) that must be soldered to a continuous ground plane on the PCB for proper thermal dissipation. At 20 MHz and 5.5V operation, typical current draw is 15-20 mA, producing <100 mW dissipation. For high-I/O-current applications driving many LEDs, ensure adequate copper pour around the EP and provide thermal vias to inner ground planes to keep junction temperature within the -40C to +85C industrial range.
Decouple VDD pins (pin 22 and pin 32) with 100 nF ceramic capacitors placed within 5 mm of each supply pin, plus a single bulk 10 uF tantalum or ceramic capacitor. The QFN-44 footprint has 0.5 mm pitch with a center thermal pad (approximately 6 mm square) that requires 8-12 thermal vias of 0.3 mm diameter to inner ground plane. Use 4-layer PCB if possible to provide a low-impedance ground reference for the ADC.
Configuration bits (fuses) must be set correctly for the chosen oscillator mode (HS, XT, LP, RC) and watchdog timer. Mismatched oscillator configuration prevents startup. The ICSP pins (RB6/PGC, RB7/PGD, MCLR/Vpp) must not be blocked by external circuitry; isolate ICSP signals with series resistors or jumpers during programming. The MSSP peripheral pins (RC3/SCK, RC4/SDI/SDA) require 10 kohm pull-ups for reliable I2C operation.
Keep analog inputs (AN0-AN7) physically separated from switching digital lines on the PCB to minimize ADC noise coupling. Place the VREF+/VREF- capacitors directly at the dedicated reference pins (RA2/RA3) when using external reference. Route the OSC1/OSC2 traces short and symmetric with a ground guard ring to reduce EMI susceptibility. Use a ground plane under the analog section and avoid routing digital signals across it.
Thông tin tuân thủ
RoHS compliant per Microchip product page. The standard '-I/ML' part is industrial grade, not AEC-Q100 qualified; for production automotive applications select an AEC-Q100 qualified ordering code. Lead-free (Pb-free) reflow profile per JEDEC J-STD-020.
