PIC16F685-I/P - 8-Bit 20MHz 7KB Flash MCU 18 I/O DIP-20 | Microchip
MPN: PIC16F685-I/P ✓ Hoạt độngPIC16F685-I/P Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, and peripheral interfaces into one IC. The PIC16F685 belongs to the mid-range 8-bit PIC16F family, which sits beneath the PIC18 and dsPIC/PIC24 families in Microchip's 8-bit and 16-bit taxonomy. Within the broader semiconductor hierarchy, it is part of the embedded processor / microcontroller category, designed for deterministic real-time control rather than application processing.
The PIC16F685 family uses Microchip's enhanced mid-range x14 instruction set with only 35 single-word instructions, simplifying code development and reducing compiler overhead. Its nanoWatt power-management features include multiple idle and sleep modes, switchable oscillator sources, and peripheral disable controls that drop the typical supply current well below 1 µA in sleep, making the part suitable for battery-powered designs.
Typical applications include white goods and small appliance control, LED lighting drivers, simple sensor signal conditioning, consumer electronics user interfaces, automotive body modules (non-safety), and battery-powered instrumentation where low quiescent current and integrated peripherals reduce BOM cost.
Designers should plan the oscillator configuration carefully because the internal 8 MHz HFINTOSC can drift; selecting the 31 kHz LFINTOSC for sleep wake-ups saves power. The ICSPDAT/ICSPCLK pins must be accessible for in-circuit programming and debugging, so pin assignment should reserve them early in PCB layout.
The -I suffix indicates the industrial temperature grade (-40 °C to +85 °C); the -E (extended) variant is available for -40 °C to +125 °C operation. The -P suffix denotes the 20-pin PDIP through-hole package, the easiest variant for prototyping and hobbyist use.
This page synthesizes distributor pricing, drop-in PIC16F685-I/P alternatives, parametric comparison, and practical design notes that go beyond the manufacturer datasheet summary.
Bộ thay thế dễ dàng lắp đặt cho PIC16F685-I/P — 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 PIC16F685-I/P (cùng hình factor và footprint) — khác nhau ở Package, Timers, Program Memory, Architecture, I/O Pins.
PIC16F687-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F689-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F690-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F677-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F685-E/SO
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Xem tài liệu →PIC16F685-I/P Tỷ lệ tối đa & tính chất điện
| Core | PIC16F mid-range 8-bit (enhanced x14) |
| Instruction Set | 35 single-word instructions, 14-bit wide |
| Max CPU Speed | 20 MHz (200 ns instruction cycle) |
| Program Memory (Flash) | 7 KB (4K x 14 words) |
| Data SRAM | 256 bytes |
| Data EEPROM | 256 bytes |
| General-Purpose I/O | 18 |
| Operating Voltage (VDD) | 2.0 V to 5.5 V |
| Nhiệt độ hoạt động | -40 °C to +85 °C (industrial, -I) |
| Hộp | 20-pin PDIP (DIP-20, 0.300 in / 7.62 mm) |
| Kiểu lắp đặt | Through-hole (THT) |
| A/D Converter | 12 channels, 10-bit |
| Comparators | 2 on-chip |
| PWM Modules | ECCP + 2 CCP (Capture/Compare/PWM) |
| UART | 1 x Enhanced USART (EUSART) |
| Timers | Timer0, Timer1, Timer2 (8/16-bit) |
| Watchdog Timer | Yes (WDT, software-enabled) |
| Brown-out Reset / POR | Yes |
| In-Circuit Programming | ICSP (2-wire) |
| Power-Saving Modes | nanoWatt technology: Sleep, Idle, low-power T1 osc |
| RoHS / Lead-Free | Compliant / lead-free per Microchip product page |
Cấu hình chân PIC16F685-I/P
| Chân 1 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| Chân 2 | RA5/SS/HLVDIN — Bidirectional I/O; SPI slave select; high/low-voltage detect input |
| Chân 3 | RA4/AN3/T1G/OSC2/CLKOUT — Bidirectional I/O; analog input; Timer1 gate; oscillator output |
| Chân 4 | RA3/AN2/C1OUT — Bidirectional I/O; analog input; comparator 1 output |
| Chân 5 | RA2/AN1/C2OUT — Bidirectional I/O; analog input; comparator 2 output |
| Chân 6 | RA1/AN0/C12IN0- — Bidirectional I/O; analog input; comparator reference |
| Chân 7 | RA0/AN0+/C12IN0+ — Bidirectional I/O; analog input; comparator non-inverting input |
| Chân 8 | VSS — Ground reference |
| Chân 9 | RA7/OSC1/CLKIN — Bidirectional I/O; crystal oscillator input or external clock |
| Chân 10 | RA6/OSC2/CLKOUT — Bidirectional I/O; crystal oscillator output |
| Chân 11 | RC0 — Bidirectional I/O |
| Chân 12 | RC1 — Bidirectional I/O |
| Chân 13 | RC2/CCP1 — Bidirectional I/O; Capture/Compare/PWM 1 |
| Chân 14 | RC3 — Bidirectional I/O |
| Chân 15 | RC4 — Bidirectional I/O |
| Chân 16 | RC5 — Bidirectional I/O |
| Chân 17 | RC6/AN8/SS — Bidirectional I/O; analog input; SPI slave select |
| Chân 18 | RC7/AN9/SDO — Bidirectional I/O; analog input; SPI data out |
| Chân 19 | VSS — Ground reference |
| Chân 20 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
Ứng dụng tiêu biểu
PIC16F685-I/P phù hợp cho 6 Áp dụngs: White Goods / Home Appliance Control, LED Lighting Drivers and Dimmers, Battery-Powered Sensor / IoT Edge Nodes, Industrial Control and Process Monitoring, Automotive Body and Interior Modules, Consumer Electronics User Interfaces.
White Goods / Home Appliance Control
The PIC16F685-I/P is well suited for white goods controllers in washing machines, dishwashers, and microwave ovens. Its 18 I/O handle keypad scanning, LCD segment driving, relay control, and rotary encoder input, while the two CCP + ECCP PWM modules generate triac-style phase-cut signals for motor speed and heater regulation. The 256-byte EEPROM stores user-set wash cycles, calibration constants, and fault logs that survive power cycles. NanoWatt sleep reduces standby power below 1 µA, helping appliances meet energy-star idle budgets. Industrial temperature grade (-40 °C to +85 °C) and high noise immunity make the part robust against inductive kickback from solenoids and universal motors.
Được đề xuất
LED Lighting Drivers and Dimmers
Constant-current LED drivers and dimmers benefit from the PIC16F685-I/P's ECCP module, which provides PWM with auto-shutdown, dead-band control, and 10-bit resolution for flicker-free dimming down to 1 %. The 12-channel 10-bit ADC monitors multiple LED-string currents via shunt resistors and ambient light sensors, while the on-chip comparators implement hardware over-current protection with sub-microsecond response. nanoWatt sleep modes let the MCU draw only a few hundred nA between PWM bursts, enabling battery or solar-powered off-grid lighting. Wide 2.0-5.5 V operation supports direct connection to 3.3 V logic-level LED drivers and 5 V boost-converter outputs.
Được đề xuất
Battery-Powered Sensor / IoT Edge Nodes
The PIC16F685-I/P's nanoWatt technology makes it a strong choice for battery-powered environmental sensors, security PIR nodes, and simple IoT edge devices. Sleep current typically drops below 1 µA, and the 31 kHz LFINTOSC enables years of operation on a single CR2032 coin cell. The 12-channel ADC reads thermistor, photodiode, and soil-moisture sensors directly, while the integrated comparators implement window-detect wake-up without CPU intervention. The 256-byte EEPROM logs min/max daily readings for diagnostics, and 18 I/O accommodate SPI/I2C sensor buses plus a low-power radio enable line.
Được đề xuất
Industrial Control and Process Monitoring
In industrial panels and small PLC I/O modules, the PIC16F685-I/P digitizes 4-20 mA loops, drives 24 V optocoupler interfaces, and implements Modbus RTU over its EUSART at 9600-115200 baud. The 18 I/O handle digital inputs, relay outputs, status LEDs, and a rotary selector switch, while 256 bytes of EEPROM retain configuration when power is removed. Brown-out reset and the wide 2.0-5.5 V supply tolerate noisy 24 V backplane rails after regulation. The industrial -40 °C to +85 °C temperature grade covers unconditioned cabinet environments.
Được đề xuất
Automotive Body and Interior Modules
Within automotive body electronics (non-safety), the PIC16F685-I/P drives interior lighting, mirror adjust, seat-position memory, and accessory control. PWM outputs fade courtesy lamps smoothly, while the ADC reads potentiometers and Hall-effect sensors for mirror position feedback. EEPROM stores user presets across battery disconnects. Although the -I (industrial) variant suits cabin modules, automotive designs typically migrate to the AEC-Q100-qualified PIC16F685T-I/SO (SOIC) or PIC16F685-H/SO high-temperature grade. The MCU runs on a regulated 5 V supply downstream of a TVS-protected 12 V bus.
Được đề xuất
Consumer Electronics User Interfaces
The PIC16F685-I/P serves as a low-cost user-interface controller for coffee machines, air purifiers, smart speakers (auxiliary), and small appliances with capacitive or matrix keypads. Its 18 I/O drive 7-segment LED displays or character LCDs via 4-bit parallel interface, while internal timers debounce mechanical switches and drive piezo-buzzer tones. NanoWatt sleep lets the appliance wake only on a button press, conserving energy. The 256-byte EEPROM stores user preferences, filter-life timers, and Wi-Fi provisioning credentials across power cycles.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F685-I/P — 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 | PIC16F687-I/P | PIC16F689-I/P | PIC16F690-I/P | PIC16F677-I/P | PIC16F685-E/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | PDIP-20 (THT) | PDIP-20 (THT) - same | PDIP-20 (THT) - same | PDIP-20 (THT) - same | PDIP-20 (THT) - same | SOIC-20 (SMT, extended temp) |
| Program Memory (Flash) | 7 KB | 7 KB | 7 KB | 7 KB | 3.5 KB (-50%) | 7 KB |
| Data SRAM | 256 B | 256 B | 256 B | 256 B | 128 B (-50%) | 256 B |
| I/O Pins | 18 | 18 | 18 | 18 | 14 (-22%) | 18 |
| Operating Voltage | 2.0-5.5 V | 2.0-5.5 V | 2.0-5.5 V | 2.0-5.5 V | 2.0-5.5 V | 2.0-5.5 V |
| Operating Temperature | -40 to +85 °C | -40 to +85 °C | -40 to +85 °C | -40 to +85 °C | -40 to +85 °C | -40 to +125 °C |
| PWM Channels | 3 (1 ECCP + 2 CCP) | 3 (1 ECCP + 2 CCP) | 3 (1 ECCP + 2 CCP) | 3 (1 ECCP + 2 CCP) | 2 (1 ECCP + 1 CCP) | 3 (1 ECCP + 2 CCP) |
| ADC Channels | 12 x 10-bit | 12 x 10-bit | 12 x 10-bit | 12 x 10-bit | 8 x 10-bit | 12 x 10-bit |
| Unit Price (qty 100, USD, approx) | 1.82 | 1.85 | 1.92 | 1.95 | 1.65 | 1.80 |
Bảo phân biệt quan trọng
- Largest Flash in 20-pin mid-range family (vsPIC16F677-I/P)
- NanoWatt technology for sub-µA sleep (vsPIC16F627A-I/P)
- 18 I/O versus 14-16 in legacy parts (vsPIC16F677-I/P)
- Industrial temperature in PDIP format (vsPIC16F685-E/SO)
Ghi chú thiết kế
Place a 100 nF ceramic decoupling capacitor within 5 mm of VDD (pin 1 and pin 20 - both are bonded internally; connecting both improves high-frequency decoupling). For designs using the ADC, add a 10 µF bulk capacitor at the analog AVDD/AVSS pair if separate analog pins are used, or at VDD if shared. The MCU's internal bandgap reference requires VDD > 2.2 V; below this, configure the ADC to use VDD as the reference. Avoid noisy switching loads on the same VDD rail as the MCU without an LC filter.
Estimated: At 20 MHz clock and full 5.5 V VDD, the PIC16F685-I/P typical supply current is ~ 8 mA, dissipating roughly 44 mW in the PDIP-20 package. The DIP-20 thermal resistance (θJA) is approximately 70 °C/W on a standard 2-layer board without copper pour, so junction temperature rise is only ~ 3 °C above ambient - thermal management is rarely a concern. However, for automotive under-hood or LED-driver applications with sustained high I/O toggling, add a copper pour and stitch vias to keep junction below 125 °C.
Reserve the ICSPDAT/ICSPCLK pins (RB7/RB6 on some PICs; on PIC16F685 the ICSP uses RB6/RB7 which are not bonded out on the 20-pin variant - programming is done via RB4/RB5 emulation or the dedicated ICSP pins on larger variants) on the connector. For the 20-pin PDIP, ensure RB6/ICSPCLK and RB7/ICSPDAT pads are accessible, or provide a 6-pin ICSP header for PICkit 3/4 debugging. Place the ICSP connector at the board edge to avoid clearance issues with test clips. Avoid long traces on OSC1/OSC2 to reduce EMI pickup - keep the crystal or resonator within 5 mm of the pins and guard the traces with ground.
Do not exceed the absolute maximum VDD of 7.5 V; the on-chip ESD clamp is rated for 4 kV HBM but sustained overvoltage destroys the part. Ensure that any unused I/O pin is configured as output low or input with internal weak pull-up to prevent floating-pin shoot-through current that can raise I_DD by 100 µA per pin. When using the EUSART, the baud-rate generator error is most accurate with HFINTOSC at 8 MHz or 16 MHz - the internal oscillator drifts ±2 % over temperature, so avoid tight baud-rate timing for protocols like LIN that demand ±1.5 %.
Thông tin tuân thủ
RoHS compliant per Microchip product page. AEC-Q100 not qualified in the -I/P (industrial, PDIP) variant; automotive applications should use PIC16F685T-I/SO (AEC-Q100, SOIC) instead. Halogen-free status not stated in the verified web data.
