PIC16F687T-I/ML
PIC16F687T-I/ML - 8-Bit 20MHz 3.5KB Flash MCU, 20-QFN | Microchip
The Microchip Technology PIC16F687T-I/ML is a low pin-count (20-pin) PIC Flash 8-bit microcontroller built on the mid-range x14 architecture, delivering 20 MHz CPU performance, 3.5 KB of program Flash, 128 bytes of RAM, and 256 bytes of EEPROM data memory in a 20-pin QFN (ML) package with exposed pad. It operates across a wide 2.0 V to 5.5 V supply range, supports in-circuit serial programming (ICSP) via two pins, and provides 18 general-purpose I/O lines arranged across multiple ports with individual direction control.
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash/ROM), working memory (RAM), non-volatile data memory (EEPROM), and a rich set of peripheral interfaces such as timers, ADC, comparators, and serial ports onto one silicon die. Within the broader power-management and embedded-control taxonomy, an 8-bit MCU sits in the hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. The PIC16F687T-I/ML belongs to the PIC16 mid-range family, which uses a 14-bit instruction word, nanoWatt Technology for low-power sleep modes, and standardized peripherals shared across the family for code portability.
Key features of this device include an enhanced USART module supporting RS-232/RS-485, a master synchronous serial port (MSSP) for SPI and I2C master/slave operation, an enhanced capture/compare/PWM (ECCP) module, two analog comparators with an internal bandgap reference, a 10-bit ADC with up to 12 channels, and four timer modules (Timer0, Timer1, Timer2, and Watchdog Timer). nanoWatt Technology provides multiple idle/sleep current modes as low as 50 nA typical at 2 V, enabling battery-backed or energy-harvesting designs. The device also includes a wide operating voltage range (2.0 V to 5.5 V) and an internal 8 MHz oscillator with PLL option for flexible clocking without external crystals.
Architecturally, the mid-range x14 core delivers deterministic 200 ns instruction cycle at 20 MHz, with a hardware stack depth of 8 levels and 35 instructions including bit-oriented operations. The internal RC oscillator with software-selectable frequencies (31 kHz to 8 MHz) plus 4x PLL enables designers to balance power consumption against timing accuracy. The 256-byte EEPROM supports byte-level endurance of 1,000,000 erase/write cycles, which is well above typical MCU expectations.
Typical applications include low-cost battery-powered sensor nodes, appliance control boards (washing machines, coffee makers), industrial automation peripherals (sensor hubs, motor-control daughter cards), automotive body electronics (interior lighting, seat controllers), low-end consumer electronics (remote controls, toys), and compact IoT edge devices using I2C or SPI peripherals. The combination of nanoWatt Technology, wide supply range, and 18 I/O pins makes the PIC16F687T-I/ML ideal for cost-sensitive designs that still need analog integration.
A critical design consideration is selecting the correct oscillator configuration in the configuration word (CONFIG) - designers must choose between internal RC, external crystal, or external clock mode based on accuracy and power needs. Another consideration is the exposed thermal pad (EP) on the QFN package, which must be soldered to a sufficient copper pour for thermal dissipation and ground continuity to meet the rated current capability per pin.
This page synthesizes distributor pricing, drop-in package alternatives, and practical design notes not found in the standalone manufacturer datasheet.
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