PIC16F688-E/ST - 8-Bit 20MHz Flash MCU | Microchip Technology
料号： PIC16F688-E/ST ✓ 量产中PIC16F688-E/ST 概述
A microcontroller is a programmable semiconductor that integrates a CPU, memory, and peripherals on one chip. The PIC16F688 belongs to the PIC16 mid-range family and uses the enhanced mid-range x14 architecture. Within the product hierarchy, it is a flash-based 8-bit embedded controller, combining a RISC-like instruction set, digital I/O, analog functions, and timing resources in a device designed for compact control systems.
The verified product information identifies a 20 MHz maximum clock, 7 KB of flash program memory, 256 bytes of RAM, and 12 I/O pins. Microchip’s product page describes the 14-pin family as supporting a 2.0 V to 5.5 V operating range and offering onboard EEPROM data memory. The -E suffix denotes the extended-temperature device family, while /ST identifies the 14-pin TSSOP package configuration.
The x14 architecture provides 14-bit program words and a compact instruction set suited to cost-sensitive embedded products. Flash memory permits in-circuit reprogramming, while the integrated EEPROM supports retention of configuration or calibration data. The MCU’s peripheral mix is intended to reduce the number of external components in applications such as industrial controls, instrument panels, simple motor controllers, and compact consumer equipment.
Typical uses include monitoring switches and sensors, sequencing external actuators, driving displays, implementing timers, and controlling small electromechanical systems. Its 12 I/O pins make the TSSOP configuration suitable for products that need moderate digital connectivity without requiring a larger leaded package. The 14-pin format also simplifies dense, low-power control boards where board area is constrained.
Circuit design should begin with the manufacturer’s pin-description table and the package drawing. Place the decoupling capacitor adjacent to VDD and VSS, route programming and debug signals away from sensitive analog inputs, and confirm that every connected pin remains valid for the selected operating voltage. Review the complete datasheet for electrical limits, oscillator options, peripheral multiplexing, and programming requirements before releasing the PCB.
This page combines the verified manufacturer and distributor facts with package guidance, application analysis, and strict drop-in replacement checks. Those engineering-focused details help distinguish a genuine pin-compatible substitution from a device that merely has a similar product name or a different package.
直接替换替代料： PIC16F688-E/ST ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC16F688-E/ST （相同外形与封装尺寸） ——差异在于 Operating Temperature, Package, Core Architecture, I/O Pins, Internal Oscillator.
PIC16F688-I/ST
✅ 直接替换联系询价
查看数据手册 →PIC16F688-E/ST 最大额定值与电气特性
| Microcontroller Type | 8-bit flash-based PIC microcontroller |
| CPU Architecture | Enhanced mid-range x14 architecture |
| 最大时钟频率 | 20 MHz |
| Program Memory | 7 KB (4K × 14 words) |
| RAM | 256 bytes |
| I/O Pins | 12 pins |
| Operating Voltage Range | 2.0 V to 5.5 V |
| Onboard EEPROM | Yes |
| 封装 | 14-pin TSSOP |
| 安装类型 | Surface mount |
| 工作温度 | -40°C to +125°C |
| ADC Resolution | 10-bit |
| Product Type | PIC16 8-bit microcontroller |
| Program Memory Type | Flash |
| 引脚数 | 14 pins |
PIC16F688-E/ST 引脚配置
| 引脚 1 | RA5/OSC1/CLKIN/C1IN — Port A digital input/output, oscillator input, clock input, or comparator input |
| 引脚 2 | RA4/OSC2/CLKOUT/C1OUT — Port A digital input/output, oscillator output, clock output, or comparator output |
| 引脚 3 | RA3/MCLR/VPP/MCLR — Port A digital input/output, master clear input, or programming voltage |
| 引脚 4 | RC5/T1CKI — Port C digital input/output or Timer1 clock input |
| 引脚 5 | RC4/T1G — Port C digital input/output or Timer1 gate input |
| 引脚 6 | RC3/SCK/SCL — Port C digital input/output, SPI clock, or I2C clock |
| 引脚 7 | RC2/INT/CCP1 — Port C digital input/output, external interrupt input, or Capture/Compare PWM output |
| 引脚 8 | RC1/T1OSI/CCP2 — Port C digital input/output, Timer1 oscillator input, or Capture/Compare PWM output |
| 引脚 9 | RC0/T1OSO/CCP1 — Port C digital input/output, Timer1 oscillator output, or Capture/Compare PWM output |
| 引脚 10 | RA2/AN2/C2IN+/VREF- — Port A digital input/output, analog input, comparator input, or negative voltage reference |
| 引脚 11 | RA1/AN1/C2OUT/VREF+ — Port A digital input/output, analog input, comparator output, or positive voltage reference |
| 引脚 12 | RA0/AN0/C2IN-/ULPWU/C12IN0 — Port A digital input/output, analog input, comparator input, or ultra-low-power wake-up function |
| 引脚 13 | VSS — Ground reference |
| 引脚 14 | VDD — Positive supply voltage |
典型应用
PIC16F688-E/ST 适用于 6 应用s: Industrial Control Panels, Temperature and Analog Monitoring, Small Motor and Actuator Sequencing, LED Lighting and Display Control, Battery-Powered Sensor Nodes, Programmable Timers and Counters.
Industrial Control Panels
The PIC16F688-E/ST is suitable for compact control panels that must monitor switches, operate indicator circuits, and coordinate actuator sequences. Its 12 I/O pins provide dedicated interface capacity, while 7 KB of flash program memory and 256 bytes of RAM support small embedded-control tasks. The 14-pin TSSOP package conserves board area, and the 2.0 V to 5.5 V family range supports common embedded supply architectures. Designers should assign multiplexing pins from the manufacturer pin table, place VDD decoupling adjacent to the device, and verify that the extended-temperature grade covers the enclosure’s worst-case environment.
推荐
Temperature and Analog Monitoring
The PIC16F688-E/ST can serve as the acquisition controller in a compact monitoring module that samples analog conditions and converts them into control or alarm decisions. The family provides a 10-bit ADC, and the device combines that conversion function with 12 I/O pins and flash-based firmware storage in one 14-pin TSSOP package. A practical design can connect a sensor to the appropriate analog-capable pin, use a stable reference arrangement, and retain configuration information in onboard EEPROM. Engineers must verify the selected analog channel, reference source, sampling requirements, and maximum input range against the manufacturer data sheet before finalizing the front end.
推荐
Small Motor and Actuator Sequencing
The PIC16F688-E/ST is appropriate for small actuator systems where a microcontroller must sequence relays, valves, indicators, or stepper-related control signals. Its enhanced mid-range x14 architecture executes firmware from 7 KB of flash, while 12 I/O pins can handle multiple digital commands and status inputs. Placing the controller in a 14-pin TSSOP package keeps the logic section compact and supports automated assembly. The design should include suitable driver circuitry for inductive loads, maintain separation between switching nodes and sensitive inputs, and validate timing through the timing peripheral and device pin-assignment table.
推荐
LED Lighting and Display Control
The PIC16F688-E/ST can control LED indicators, status lamps, or segmented display logic in compact appliances and instrumentation. The 12 available I/O pins allow the firmware to drive multiple outputs and read front-panel controls, while flash memory permits reusable product configurations. A 20 MHz maximum clock also supports deterministic timing for display updates, blink patterns, and button debouncing. The 14-pin TSSOP footprint minimizes board area in space-constrained products. Use current-limiting resistors or suitable driver devices for LEDs, account for simultaneous-output loading, and follow the package drawing when planning copper and soldering.
推荐
Battery-Powered Sensor Nodes
The PIC16F688-E/ST fits low-power sensor nodes that periodically measure a condition, process the result, and return to a low-power state. Its family supports a 2.0 V to 5.5 V supply range and is described in the manufacturer data sheet as using nanoWatt technology, providing useful options for energy-conscious designs. Flash program memory allows firmware updates, while 256 bytes of RAM supports short working-data tasks. The 14-pin TSSOP package leaves board area for the sensor and power circuitry. Final battery-life calculations should include sensor standby current, regulator losses, wake intervals, and the controller mode selected in firmware.
推荐
Programmable Timers and Counters
The PIC16F688-E/ST can implement timers, event counters, delay controllers, and simple periodic-task managers in appliances and laboratory equipment. Its 20 MHz maximum clock and enhanced mid-range x14 architecture provide a compact execution platform, with 7 KB of flash available for control code and 256 bytes of RAM for operating variables. The 12 I/O pins can accept sensor events and generate control outputs without requiring a larger package. Designers should use the manufacturer’s timer, interrupt, and pin-muxing guidance, account for oscillator accuracy, and avoid deriving safety-critical timing from software without suitable hardware supervision.
推荐
推荐产品汇总
工程参考数据： PIC16F688-E/ST ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC16F688-I/ST |
|---|---|---|
| Package | 14-pin TSSOP | 14-pin TSSOP |
| Brand | Microchip Technology | Microchip Technology |
| Temperature Grade | Extended temperature, -40°C to +125°C | Industrial temperature grade |
关键差异点
- Extended-temperature ordering option （对比 PIC16F688-I/ST)
- Compact 20 MHz control platform （对比 PIC16F688-I/ST)
- Integrated program and data memory （对比 PIC16F688-I/ST)
设计说明
Place the VDD decoupling capacitor immediately between pins 14 and 13, with a short, low-inductance connection and a solid ground plane. Route oscillator-sensitive inputs away from switching nodes and high-current return paths. Because several PIC16F688 pins multiplex analog, digital, and timer functions, assign the final netlist before routing and verify every alternate-function conflict against the manufacturer pin-description table.
Design the supply path for the family’s 2.0 V to 5.5 V operating range while allowing for transient and startup conditions at the 20 MHz clock. Confirm the maximum operating frequency at the selected VDD level rather than assuming that 20 MHz is valid across the complete voltage range. Use local bulk and high-frequency decoupling to prevent supply disturbance from switching loads or ADC activity.
Do not treat the -E/ST and -I/ST suffixes as interchangeable without checking environmental requirements, nor assume that a PIC16F688 in SOIC or another package can replace the TSSOP version. Confirm MCLR handling, programming voltage, oscillator configuration, configuration words, and brownout behavior in the manufacturer data sheet. A footprint match alone does not qualify a replacement for production release.
合规信息
Compliance status is not explicitly stated in the verified manufacturer and distributor records. The verified listing specifies a -40°C to +125°C operating range but does not establish AEC-Q100 qualification.
