Product Overview
The PIC16F688-I is a 14-pin, 8-bit Flash-based CMOS microcontroller from Microchip Technology featuring an Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART) and 8-channel 10-bit ADC. Based on the Mid-Range PIC architecture with 35 instructions and an 8-level deep hardware stack, it offers 7KB (4K x 14 words) of Flash program memory, 256 bytes of RAM, and 256 bytes of data EEPROM. Operating at up to 20 MHz with a 200 ns instruction cycle, this compact MCU integrates a precision 8 MHz internal oscillator factory calibrated to ±1%, two analog comparators, and nanoWatt Technology for low-power operation. With its EUSART supporting RS-232, RS-485, and LIN protocols, plus 10-bit ADC in a small 14-pin package, the PIC16F688 is ideal for sensor interfaces with serial output, LIN bus nodes, battery-powered monitoring devices, and space-constrained applications requiring both analog sensing and serial communication.
Key Specifications
| Core Architecture | 8-bit PIC (Mid-Range Core) |
| Program Memory | 7KB Flash (4K x 14 words) |
| RAM | 256 bytes |
| Data EEPROM | 256 bytes |
| Maximum Speed | 20 MHz (5 MIPS) |
| Operating Voltage | 2.0V to 5.5V |
| I/O Pins | 12 |
| ADC | 10-bit, 8 channels |
| Comparators | 2 |
| Timers | 1 x 8-bit (TMR0) + 1 x 16-bit (TMR1) |
| PWM | None (CCP not available on this variant) |
| Communication | EUSART (UART/RS-232/RS-485/LIN) |
| Internal Oscillator | 8 MHz (±1% factory calibrated) |
| Stack Levels | 8 |
| Operating Temperature | -40°C to +85°C (Industrial) |
| Package | 14-pin PDIP / SOIC / TSSOP / QFN / DFN |
Features
- Mid-Range PIC architecture with 35 single-cycle instructions and 8-level stack
- Enhanced USART (EUSART) with auto-baud detect, supporting RS-232/RS-485/LIN 2.0
- 8-channel 10-bit Analog-to-Digital Converter (ADC)
- Precision internal oscillator: 8 MHz factory calibrated to ±1%
- Software selectable frequency range: 8 MHz to 32 kHz
- Two analog comparators with programmable on-chip voltage reference (CVREF)
- 256 bytes of data EEPROM for non-volatile parameter storage
- nanoWatt Technology for ultra-low power consumption
- Ultra Low-Power Wake-up (ULPW) on pin change
- Timer0: 8-bit timer/counter with 8-bit programmable prescaler
- Timer1: 16-bit timer/counter with prescaler and gate control
- Power-on Reset (POR), Power-up Timer (PWRT), Oscillator Start-up Timer (OST)
- Enhanced Watchdog Timer (WDT) with on-chip RC oscillator
- In-Circuit Serial Programming (ICSP) via two pins
- Programmable code protection for program and data memory
- High current I/O pins: 25 mA sink/source per pin
- Automotive AEC-Q100 qualified
- LIN bus automotive sensor nodes
- Serial sensor interfaces and smart transducers
- Battery-powered monitoring and data logging
- Industrial control with RS-485 communication
- Space-constrained consumer electronics
- Home automation sensor nodes
- Medical devices with serial connectivity
- Automotive LIN bus sensor nodes and actuators
- Smart serial sensors with analog input and UART output
- Battery-powered data loggers with serial connectivity
- Industrial RS-485 sensor networks
- Space-constrained consumer electronics
- Home automation and IoT sensor endpoints
- Portable medical devices with serial data output
- Automotive Electronics: All automotive-grade components pass AEC-Q series certification, featuring excellent stability and durability to adapt to complex vehicle operating environments.
- Medical Devices: High-reliability components meet medical industry safety and compliance regulations, ensuring stable operation for medical equipment.
- Industrial Control & Consumer Electronics: Products conform to universal international electronic industry standards, suitable for long-term continuous operation of various equipment.
- Accepted Payment Methods
- T/T (Bank Wire Transfer): The primary settlement method for bulk orders and a widely used international payment channel.
- PayPal: Ideal for small orders, sample orders and quick payments.
Settlement Currency
US Dollar (USD) is the default settlement currency. RMB is available for domestic customers.
Bank Charges
All transfer fees, intermediary bank charges and other remittance-related expenses shall be borne by the buyer.
- Payment Requirements
- Sample and small orders: Shipment will be arranged upon full payment.
- In-stock bulk orders: Goods will be delivered within 2 to 3 working days after full payment.
- Logistics Partners
- International Express: DHL, FedEx, UPS, TNT
- Economy Logistics: Air freight and sea freight for large-volume cargo
- Domestic Delivery: SF Express, Yunda Express
- Order Processing Time
- In-stock items: Orders confirmed and fully paid before 14:00 (GMT+8) will be shipped on the same day. All other orders will be dispatched within 1 to 2 working days.
- Out-of-stock or sourced items: The delivery lead time will be confirmed separately according to brand and inventory status.
- Estimated Transit Time
- International Express: 3 – 7 working days globally
- Air Freight: 7 – 12 working days
- Sea Freight: 25 – 40 working days for heavy and large bulk cargo
- Shipping Fee Rules
- Shipping cost is calculated based on package weight, volume, destination and delivery method.
- Both freight prepaid and freight collect are available. Please provide your courier account number in advance if you choose freight collect.
- Free international express delivery is offered for large orders. Terms for long-term partners can be negotiated separately.
- Shipment Tracking
Within 24 hours after dispatch, we will send the tracking number, commercial invoice, packing list and other documents to your email or communication account. You may check the shipment status online in real time.
MOQ & Sample Service
We support flexible minimum order quantities for samples, small-batch and large-batch orders. All sample orders shall comply with the above shipping and payment policies.
Packaging Standard
All electronic components are packed with professional anti-static and shockproof materials. Original factory packaging is available for branded chips and integrated circuits.
Import Duties & Taxes
All import duties, customs clearance fees and local taxes incurred for international shipments shall be borne by the buyer. We will provide complete customs documents to assist you with clearance procedures.
- Handling of Lost or Damaged Goods
- In case of loss or severe damage during transit, please contact us within 48 hours after receiving the tracking information. We will assist you in filing a claim with the logistics provider.
- We shall not be liable for any losses caused by incorrect delivery address, wrong contact information or the buyer’s refusal to complete customs clearance.
- Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong Province, China
- Business Hours: 09:00 – 18:00, Monday to Friday. Closed on weekends and official public holidays.
- Notice: Please make an appointment via email or communication tools one day in advance, and present your order information upon pickup.
- All components are packed separately to avoid damage caused by friction and collision;
- Shockproof buffer materials are added for fragile products to ensure transportation safety;
- Each package is clearly marked with part number, quantity, batch number and specifications for easy inventory counting and management.
- Anti-static Packaging: Static-sensitive components such as chips, circuit boards and sensors are packaged with anti-static bags, shielding boxes and conductive foam in strict accordance with international anti-static standards to prevent static damage.
- Vacuum Moisture-proof Packaging: Moisture-sensitive components are vacuum-sealed with desiccants to isolate humid air, suitable for ocean transportation and long-term storage.
- Original Factory Packaging: Integrated circuits of brands such as NXP are delivered with original reels, trays or tubes by default, retaining complete original packaging and adapting to automated SMT production lines.
- Discrete Device Packaging: Discrete devices such as SMD resistors, power resistors and LEDs are quantitatively and classifiedly packaged with accurate quantity and clear marking.
- Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.
Applications
The PIC16F688 is a 14-pin Flash-based 8-bit CMOS microcontroller from Microchip Technology featuring an Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART) and 8-channel 10-bit ADC. Part of the popular PIC16F6xx family, this device offers 7KB (4K x 14 words) of Flash program memory, 256 bytes of RAM, and 256 bytes of data EEPROM. It operates at up to 20 MHz with a 200 ns instruction cycle, delivering 5 MIPS of processing power. The EUSART peripheral supports standard UART communication (RS-232/RS-485) as well as LIN 2.0 protocol with auto-baud detection, making it ideal for automotive and industrial networking applications. The 8-channel 10-bit ADC provides multi-channel analog sensing capability, while two analog comparators with programmable voltage reference add threshold detection functionality. A precision internal oscillator operates at 8 MHz (factory calibrated to ±1%) with software-selectable division ratios down to 32 kHz, eliminating the need for external crystals in most applications. With nanoWatt Technology providing multiple low-power modes including Ultra Low-Power Wake-up (ULPW), the PIC16F688 is well-suited for battery-powered sensor applications. Automotive AEC-Q100 qualification ensures reliability in harsh environments. Available in PDIP, SOIC, TSSOP, QFN, and DFN packages with industrial temperature range (-40°C to +85°C).
The PIC16F688 operates on a Mid-Range PIC RISC core with Harvard architecture, providing separate 14-bit program and 8-bit data memory buses for concurrent access. Most of the 35 instructions execute in a single clock cycle, with an 8-level deep hardware stack for subroutine calls. The Enhanced USART (EUSART) module handles asynchronous serial communication with hardware support for standard UART framing, automatic baud rate detection, and LIN bus compatibility. It includes a dedicated 8-bit baud rate generator with 16-bit fractional baud rate capability for high accuracy at various speeds. The 10-bit ADC uses successive approximation register (SAR) architecture to convert analog inputs from 8 channels, with programmable acquisition time and voltage reference options. Two analog comparators with a Comparator Voltage Reference (CVREF) module provide threshold detection and window comparison capabilities. The internal oscillator module generates a factory-calibrated 8 MHz clock with software-selectable post-scaler division ratios (8 MHz down to 32 kHz), plus software tuning capability for fine adjustment. Timer0 is an 8-bit timer/counter with 8-bit prescaler, while Timer1 is a 16-bit timer/counter with prescaler, gate control, and optional low-power 32 kHz oscillator operation. Power management features include Sleep mode, Idle mode, Brown-out Reset, and Watchdog Timer for reliable low-power operation. The 256 bytes of EEPROM provide non-volatile data storage with high endurance for storing configuration parameters and calibration data.
| Pin (PDIP-14/SOIC-14) | Name | Type | Function |
|---|---|---|---|
| 1 | VDD | P | Positive Supply Voltage |
| 2 | RA5/T1CKI/OSC1/CLKIN | I/O | Port A I/O / Timer1 Clock / Oscillator Input / Clock In |
| 3 | RA4/T1G/OSC2/CLKOUT | I/O | Port A I/O / Timer1 Gate / Oscillator Output / Clock Out |
| 4 | RA3/MCLR/VPP | I/P | Port A Input / Master Clear / Programming Voltage |
| 5 | RC5/TX/CK | I/O | Port C I/O / EUSART Transmit / Clock |
| 6 | RC4/C2OUT/SRQ/RX/DT | I/O | Port C I/O / C2 Output / SR Latch Out / EUSART Receive |
| 7 | RC3/C12IN3-/AN7 | I/O | Port C I/O / Comparator Neg Input 3 / ADC Ch7 |
| 8 | RC2/C12IN2-/AN6 | I/O | Port C I/O / Comparator Neg Input 2 / ADC Ch6 |
| 9 | RC1/C12IN1-/AN5 | I/O | Port C I/O / Comparator Neg Input 1 / ADC Ch5 |
| 10 | RC0/C2IN+/C1IN+/AN4 | I/O | Port C I/O / Comparator Pos Input / ADC Ch4 |
| 11 | VSS | P | Ground Reference |
| 12 | RA0/C1IN+/AN0/ULPWU | I/O | Port A I/O / C1+ / ADC Ch0 / ULP Wake-up |
| 13 | RA1/C2IN+/AN1 | I/O | Port A I/O / C2+ / ADC Channel 1 |
| 14 | RA2/T0CKI/INT/C1OUT/AN2 | I/O | Port A I/O / T0CKI / Ext Int / C1 Out / ADC Ch2 |
| Manufacturer | Part Number | Package | Notes |
|---|---|---|---|
| Microchip | PIC16F690-I | 20-pin | 20-pin, 12-ch ADC, SPI/I2C, ECCP |
| Microchip | PIC16F684-I | 14-pin | 14-pin, 10-bit ADC, CCP, no EUSART |
| Microchip | PIC12F683-I | 8-pin | 8-pin, 3.5KB Flash, 4-ch ADC |
| Microchip | PIC16F677-I | 20-pin | 3.5KB Flash, SPI/I2C, 12-ch ADC |
| Microchip | PIC16F1824-I | 14-pin | Newer gen, 7KB Flash, enhanced peripherals |
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
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