PIC16F688-E/P - 20MHz 8-Bit Flash MCU | Microchip Technology
MPN: PIC16F688-E/P ✓ فعالPIC16F688-E/P نمای کلی
A microcontroller is a programmable integrated circuit that combines a CPU core, memory, I/O ports, and peripherals on one device. The PIC16F688 belongs to the PIC16 family of 8-bit RISC microcontrollers and is positioned as a low-pin-count solution for compact control systems. Its PIC mid-range 14-bit instruction architecture provides a practical balance between processing capability, program memory, and component cost.
The verified specifications identify 7 KB of flash memory organized as 4K × 14 words, 256 bytes of SRAM, and a maximum clock frequency of 20 MHz. Twelve I/O pins provide flexible connections for digital control, while the 10-bit ADC supports analog measurement. The -40°C to +125°C temperature range suits industrial equipment, consumer controls, and temperature-variable environments when appropriately qualified.
PIC16F688-E/P is packaged in a through-hole 14-pin PDIP format, easing breadboard prototyping, legacy PCB reuse, hand assembly, and inspection. The -E speed-grade designation differentiates it from the standard -I grade, while /P identifies the PDIP package. Its 2.0 V to 5.5 V supply range allows use in systems operating from regulated 2.0 V, 3.3 V, or 5 V rails.
Typical uses include temperature controllers, small motor-control boards, sensor interfaces, LED lighting systems, industrial timers, and compact household appliances. In these systems, the 12 I/O pins can operate external switches, indicators, relays, or sensors, while the ADC converts analog inputs into digital values for the firmware. The on-board EEPROM can retain configuration or calibration information when the required endurance is adequate.
Designers should verify oscillator, reset, decoupling, and peripheral details in the Microchip datasheet before layout release. Place the supply bypass capacitor close to VDD, connect the appropriate decoupling and programming interface to MCLR/VPP, and validate unused inputs. Software must also account for the shared analog and digital functions of the I/O pins and use the documented low-power modes correctly.
This page combines verified manufacturer and distributor information with pin-level guidance, application context, pricing as of 2026-10-28, and an honest assessment of replacement availability. The available data confirms a 14-pin PDIP target but does not identify five verified, same-package drop-in equivalents, so fewer alternatives are listed rather than padding the list with package-incompatible parts.
جایگزین‌های drop-in برای PIC16F688-E/P — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای PIC16F688-E/P (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Operating Temperature, Package.
PIC16F688-I/P
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16F688-E/P حداکثر مقادیر مجاز و مشخصات الکتریکی
| CPU Architecture | 8-bit PIC16 mid-range architecture |
| حداکثر فرکانس کلاک | 20 MHz |
| Program Memory | 7 KB flash (4K × 14 words) |
| RAM | 256 bytes |
| Data Memory | On-board EEPROM |
| ADC Resolution | 10-bit |
| I/O Pin Count | 12 pins |
| Operating Voltage | 2.0 V to 5.5 V |
| Total Pin Count | 14 pins |
| بسته‌بندی | 14-pin PDIP |
| نوع نصب | Through-hole |
| دمای کاری | -40°C to +125°C |
| Program Counter Width | 13-bit |
| Program Memory Address Space | 4K × 14 words |
| Low-Power Technology | nanoWatt technology |
| Instruction Architecture | 14-bit PIC mid-range instruction set |
پیکربندی پین PIC16F688-E/P
| پین 1 | MCLR/VPP — Program/verify voltage pin and master clear reset input |
| پین 2 | RA0/AN0 — PORTA digital input/output and analog input |
| پین 3 | RA1/AN1 — PORTA digital input/output and analog input |
| پین 4 | RA2/AN2/VREF — PORTA digital input/output, analog input, and voltage reference |
| پین 5 | RA3/AN3 — PORTA digital input/output and analog input |
| پین 6 | RA4/T0CKI/C1OUT — PORTA digital input/output, Timer0 clock input, and comparator output |
| پین 7 | RA5/AN4/SS/C2OUT — PORTA digital input/output, analog input, synchronous serial input, and comparator output |
| پین 8 | VSS — Ground reference |
| پین 9 | RB0/AN8 — PORTB digital input/output and analog input |
| پین 10 | RB1/AN9 — PORTB digital input/output and analog input |
| پین 11 | RB2/AN10 — PORTB digital input/output and analog input |
| پین 12 | VDD — Positive supply voltage |
| پین 13 | RB4 — PORTB digital input/output |
| پین 14 | RB5 — PORTB digital input/output |
کاربردهای معمول
PIC16F688-E/P مناسب است برای 6 کاربردs: Industrial Temperature Controller, Compact Sensor Interface, LED Lighting Controller, Small Motor and Relay Control, Battery-Powered Home Appliance, Programmable Logic and Timer Board.
Industrial Temperature Controller
PIC16F688-E/P fits an industrial temperature controller because it combines a 10-bit ADC with 12 I/O pins, a 20 MHz clock, and an extended operating range of -40°C to +125°C. A sensor signal can be sampled by the ADC, processed by the 8-bit CPU, and used to operate a relay, heater, or solid-state switch through an I/O pin. The 7 KB flash memory provides room for control tables, calibration coefficients, and safety-state logic, while 256 bytes of RAM supports temporary measurement and debounce variables. The 2.0 V to 5.5 V operating range also allows the controller to operate from common regulated industrial rails. Layout should include close supply decoupling, a defined MCLR/VPP reset network, and input conditioning appropriate to the sensor.
پیشنهادی
Compact Sensor Interface
PIC16F688-E/P can serve as a compact sensor interface when a design needs local analog measurement and digital control without a larger microcontroller package. Its 10-bit ADC handles suitable analog inputs, while 12 I/O pins connect sensors, status indicators, and a communications interface. The 20 MHz maximum operating frequency gives firmware capacity for sampling, filtering, and protocol handling within a 14-pin PDIP footprint. Because the PIC16F688 also includes on-board EEPROM, calibration values or configuration records can be retained without an external memory device when endurance requirements permit. The implementation should verify each pin’s analog and digital multiplexing, define unused inputs, and provide filtering at external sensor outputs to prevent unwanted ADC transitions or noise from influencing control decisions.
پیشنهادی
LED Lighting Controller
PIC16F688-E/P is appropriate for an LED lighting controller that requires programmable timing, multiple outputs, and compact through-hole assembly. The 12 I/O pins can drive status LEDs or control transistor stages for larger lighting loads, while the 20 MHz clock supports PWM-based dimming and sequences. Its 256 bytes of RAM accommodates timers and state variables, and the 7 KB flash space is sufficient for lighting tables, fade profiles, and operating modes. The 2.0 V to 5.5 V supply range permits integration with 3.3 V or 5 V controller electronics. Current limits and switching-node conditions must be checked carefully: GPIO pins should not directly drive loads beyond their specified limits, and an appropriate transistor or driver stage should provide the required LED current and polarity.
پیشنهادی
Small Motor and Relay Control
PIC16F688-E/P can coordinate small relay or motor-control functions where the final power stage is external to the microcontroller. Twelve I/O pins provide outputs for relay drivers, direction controls, limit inputs, and status LEDs, while the 10-bit ADC can monitor a current or position feedback signal. The 20 MHz clock allows responsive control loops and debounce handling, and the -40°C to +125°C range supports extended-temperature equipment. The PIC16F688 does not directly replace a protected power MOSFET or motor driver, so designers must include suitable driver circuitry, flyback protection for inductive loads, and fault shutdown. Firmware should also define safe outputs during reset and power-loss conditions so that a relay or motor cannot remain unintentionally energized.
پیشنهادی
Battery-Powered Home Appliance
PIC16F688-E/P suits a small battery-powered home appliance in which low pin count, EEPROM storage, and low-power operation are valuable. The controller can manage a button panel, status indicator, and simple sensor inputs using its 12 I/O pins, while on-board EEPROM can retain user settings or calibration data. Its 2.0 V minimum operating voltage supports low-voltage designs, and the available nanoWatt technology provides a basis for reducing consumption during inactive periods. The firmware should use the documented sleep and wake behavior, and the analog section must be configured carefully to avoid unnecessary current use. The final battery-life calculation must include sensor current, regulator efficiency, leakage paths, and load-specific behavior; these values were not supplied in the verified data and therefore must be obtained from the individual design.
پیشنهادی
Programmable Logic and Timer Board
PIC16F688-E/P can implement a compact programmable timer or logic controller for equipment where relay outputs, configurable sequences, and stored settings are required. Its 7 KB flash memory supports schedules and state-machine firmware, while 256 bytes of RAM is sufficient for timers, counters, and event flags. The 14-pin PDIP package simplifies assembly and retrofit work in through-hole industrial products, and the 2.0 V to 5.5 V operating range supports several supply standards. On-board EEPROM is useful for retaining schedules or configuration values, although write-cycle limits must be incorporated into the update strategy. Engineers should use timer inputs and external interrupt sources appropriately, protect output drivers from inductive transients, and ensure the controller’s reset behavior produces a defined equipment state during startup.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای PIC16F688-E/P — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | PIC16F688-I/P |
|---|---|---|
| Brand | Microchip Technology | Microchip Technology |
| Package | 14-pin PDIP | 14-pin PDIP - same |
| CPU Architecture | 8-bit PIC16 | 8-bit PIC16 |
| Maximum Clock Frequency | 20 MHz | 20 MHz |
| Program Memory | 7 KB flash (4K × 14 words) | 7 KB flash (4K × 14 words) |
| RAM | 256 bytes | 256 bytes |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Temperature Grade | Extended: -40°C to +125°C | Industrial: -40°C to +85°C |
| ADC Resolution | 10-bit | 10-bit |
| I/O Pin Count | 12 pins | 12 pins |
تفاوت‌های کلیدی
- Extended-temperature ordering option (در مقابلPIC16F688-I/P)
- Same-footprint family migration (در مقابلPIC16F688-I/P)
- Through-hole PCB reuse (در مقابلPIC16F688-I/P)
یادداشت‌های طراحی
Place the required decoupling capacitor close to the VDD and VSS pins and route each connection with a short, low-inductance path. The verified operating range is 2.0 V to 5.5 V, but the exact capacitor value and ESR or frequency characteristics must be taken from datasheet 41203B rather than inferred from the general voltage range. Validate startup current and analog-reference stability in the final layout.
Reserve the programming and reset interface around MCLR/VPP because it combines the master-clear function with programming voltage access. Avoid long traces between the programmer connector, MCLR/VPP, and the supply return. For the 14-pin PDIP, keep the pin-1 orientation unambiguous during assembly and inspection, and do not exchange RA0 through RA5 with RB0 through RB2 because several alternate peripheral functions differ by pin.
Do not assume that every I/O pin supports every peripheral function. RA4 is also a Timer0 clock input and comparator output, RA5 includes synchronous-serial and comparator functions, and RB0 through RB2 include analog inputs. Firmware and board design must jointly configure these multiplexed functions. Unused inputs should be brought to a defined electrical state in accordance with the manufacturer guidance rather than left floating.
For battery-powered designs, calculate the average current from MCU active current, sleep current, ADC usage, pull-up or pull-down networks, and external sensor loads. The nanoWatt label describes the device’s low-power capability but does not establish a complete application-level current figure. Measure the assembled product across its operating states and avoid frequent EEPROM writes when nonvolatile data can be updated in RAM and written only when necessary.
اطلاعات انطباق
The supplied verified pages do not provide extractable RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. The -E suffix denotes an extended-temperature grade and must not be treated as proof of AEC-Q100 automotive qualification.
