PIC16C66-20E/SP - 8-Bit 20MHz OTP MCU 14KB | Microchip
N.º de pieza: PIC16C66-20E/SP ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $7.5 | $7,50 |
| 10 | $6.75 | $67,50 |
| 100 | $6.05 | $605,00 |
| 500 | $5.4 | $2.700,00 |
| 1.000 | $4.85 | $4.850,00 |
PIC16C66-20E/SP Descripción general
An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU, program memory, data RAM, and configurable I/O peripherals. It belongs to the broader hierarchy: microcontroller -> embedded processor -> semiconductor -> integrated circuit. The PIC16C6x family specifically belongs to Microchip's mid-range PIC architecture (14-bit instruction word, 35 single-word instructions), which sits between the baseline PIC10/12/16 family and the high-end PIC17/18 family.
Key features include a wide operating voltage range of 2.5V to 6.0V, ultra-low power consumption (15 uA typical at 5V/4 MHz, 1 uA typical at 3V/32 kHz), brown-out reset and power-on reset for robust operation, and a watchdog timer for fail-safe recovery. The fully static CMOS design allows clock frequencies down to DC, and the Harvard architecture separates program and data buses for predictable single-cycle instruction execution (except program branches, which take two cycles).
The PIC16C66 employs Microchip's classic two-stage pipeline with 14-bit-wide OTP EPROM program memory. The 8-bit ALU operates on a 368-byte general-purpose RAM with hardware banking support, and the 22 I/O pins are individually bidirectional with TTL/CMOS-compatible input thresholds and programmable weak pull-ups on PORTB. The MSSP peripheral implements both I2C master/slave and SPI master/slave, and the enhanced USART provides asynchronous and synchronous serial communication for embedded networking.
Typical applications include industrial control and automation, motor control (using the PWM and timers), sensor interfacing via I2C/SPI, embedded data acquisition, HVAC controllers, security alarm panels, and automotive body electronics. The Extended temperature range allows operation in harsh environments.
Designers should note that OTP memory cannot be re-programmed in-circuit - any firmware revision requires a new device. Consider the PIC16F66 Flash variant for development and field updates. Always use an external oscillator or crystal for timing-sensitive UART communication; the internal oscillator is not available on this OTP-based PIC16C6x member.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet - including same-family variants, Flash replacements, and pin-compatible PIC16C6x siblings for legacy design migration.
Alternativas directas para PIC16C66-20E/SP — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con PIC16C66-20E/SP (mismo factor de forma y huella) — difiere en Package, Timers, Program Memory Type, Mounting Type, Core Architecture.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PIC16C66-20/SP
✅ Sustitución directa✓ En stock
$4.61 / unidad
Ver hoja de datos →PIC16C66-04E/SP
✅ Sustitución directa✓ En stock
$5.24 / unidad
Ver hoja de datos →PIC16C66-04I/SO
✅ Sustitución directa✓ En stock
$5.1 / unidad
Ver hoja de datos →PIC16C662-04I/P
✅ Sustitución directa✓ En stock
$5.07 / unidad
Ver hoja de datos →PIC16C65B-04E/P
✅ Sustitución directa✓ En stock
$5.45 / unidad
Ver hoja de datos →PIC16C66-20E/SP Valores máximos y características eléctricas
| Product Type | 8-Bit Microcontroller (MCU) |
| Family | PIC16C6x (Mid-Range) |
| Core Architecture | PIC 8-bit RISC, 14-bit instruction word |
| CPU Speed (Maximum) | 20 MHz |
| Instruction Set Size | 35 single-word instructions |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 14 KB (8K x 14) |
| RAM | 368 bytes |
| Number of I/O Pins | 22 |
| Supply Voltage (Vdd) | 2.5 V to 6.0 V |
| Active Current (5V, 4 MHz) | 15 uA typical |
| Sleep Current (3V, 32 kHz) | 1 uA typical |
| Temperatura de funcionamiento | -40C to +125C (Extended) |
| Timers | 3 (Timer0, Timer1, Timer2) |
| PWM | 1 x 10-bit CCP/PWM |
| Communication | USART + MSSP (SPI/I2C) |
| Encapsulado | 28-SPDIP (Skinny Plastic DIP, 0.300 inch) |
| Tipo de montaje | Through-Hole |
| Watchdog Timer | Yes |
| Brown-out Reset / POR | Yes |
Configuración de pines de PIC16C66-20E/SP
| Pin 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / Voltage reference |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Pin 8 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 9 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Pin 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| Pin 12 | RC2/CCP1 — PORTC bit 2 / CCP1 (PWM) output |
| Pin 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 16 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| Pin 17 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| Pin 18 | VSS — Ground |
| Pin 19 | VDD — Positive supply voltage |
| Pin 20 | RB0/INT — PORTB bit 0 / External interrupt |
| Pin 21 | RB1 — PORTB bit 1 |
| Pin 22 | RB2 — PORTB bit 2 |
| Pin 23 | RB3 — PORTB bit 3 |
| Pin 24 | RB4 — PORTB bit 4 |
| Pin 25 | RB5 — PORTB bit 5 |
| Pin 26 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 27 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 28 | RD0 — PORTD bit 0 |
Aplicaciones típicas
PIC16C66-20E/SP es adecuado para 6 aplicacións: Industrial Process Control, HVAC Climate Control, Security Alarm Panels, Automotive Body Electronics, Sensor Data Acquisition Front-End, Embedded Serial Communication Bridge.
Industrial Process Control
The PIC16C66-20E/SP fits industrial process controllers because its 22 digital I/O can directly drive relays, solenoid valves, optocouplers, and indicator LEDs, while the 14 KB OTP program memory holds PID loop logic, alarm thresholds, and Modbus RTU message handlers. The USART supports Modbus RS-485 half-duplex communication with an external transceiver, and the MSSP implements I2C master communication to digital temperature sensors (TC74, LM75) and EEPROM calibration tables. The Extended temperature range (-40C to +125C) allows placement inside sealed control cabinets near motor starters. Designers use the brown-out reset to prevent corrupt register state during brown-outs on 24V industrial rails stepped down to 5V, and the watchdog timer recovers the controller if firmware hangs due to EMI from VFD inverters on the factory floor.
Recomendado
HVAC Climate Control
The PIC16C66-20E/SP is well suited for HVAC thermostat and zone controller designs where 22 I/O drive triac interfaces for compressor, fan, and reversing valve control, while three timers implement PWM damper servo control and time-proportional temperature averaging. The 14 KB OTP holds scheduling algorithms for multi-zone setback, while 368 byte RAM buffers 24-hour setpoint history. MSSP I2C master interfaces to EEPROM (24LC256) for non-volatile schedule storage and to a CO2 sensor (MH-Z19) for demand-controlled ventilation. The 2.5V-6.0V operating voltage range allows direct connection to 5V regulated supplies from 24VAC HVAC transformers. Brown-out reset ensures clean recovery after power-cycling during seasonal maintenance.
Recomendado
Security Alarm Panels
The PIC16C66-20E/SP drives PIR motion sensors, door/window reed switches, glass-break detectors, and keypad scanners across its 22 digital I/O. The 14 KB OTP holds zone-by-zone arming logic, entry/exit delay timing (using Timer0), and alarm event logging. The MSSP SPI master interfaces to a 25LC256 EEPROM for event history persistence across power cycles, while the USART communicates with a central monitoring station via a dialer modem or Ethernet bridge. Brown-out reset and watchdog timer together provide defense-in-depth: brown-out catches power-supply failures and watchdog recovers the MCU if firmware hangs due to electrical noise from alarm sirens. The Extended temperature range supports unheated garage and attic installations.
Recomendado
Automotive Body Electronics
The PIC16C66-20E/SP's Extended temperature rating (-40C to +125C) makes it acceptable for non-safety automotive body modules such as seat controllers, mirror adjusters, interior lighting, and accessory delay timers. The 22 I/O drive H-bridge motor drivers for window/seat motors and LED current sinks for ambient lighting, with Timer1/Timer2 implementing PWM dimming curves. The USART communicates with BCM via LIN bus through an external MC33662 transceiver. Brown-out reset handles cranking voltage drop to 6V, while the watchdog timer recovers from load-dump transients. Designers should note this is a non-AEC-Q100 part - for safety-critical modules use PIC16F1938-I/SP or a dedicated automotive MCU family.
Recomendado
Sensor Data Acquisition Front-End
The PIC16C66-20E/SP serves as a low-cost sensor aggregation front-end, with 22 I/O interfacing multiple digital sensors via SPI (using MSSP) and I2C (also using MSSP in master mode), then forwarding processed data via USART to a host processor. The 14 KB OTP holds sensor calibration coefficients and linearization routines for thermocouples, strain gauges, and pressure transducers. Three timers schedule periodic polling (Timer0) and time-stamping (Timer1). The 2.5V-6.0V supply range supports battery-powered remote sensor pods with solar charging via external energy harvester. The 1 uA sleep current enables duty-cycled measurement at < 1% average power, extending battery life to multiple years on 2x AA cells.
Recomendado
Embedded Serial Communication Bridge
The PIC16C66-20E/SP functions as a protocol bridge between SPI peripherals and UART/RS-232 hosts - a common requirement when adding GPS, cellular, or Bluetooth modules to legacy RS-232 systems. MSSP handles SPI master communication with the target peripheral (e.g. SD card, RFID reader), while the USART presents the data stream to the host at configurable baud rates up to 115200 bps. The 14 KB OTP holds framing logic, checksums, and command parsers, while 368 byte RAM buffers incoming packets. The 20 MHz CPU clock provides ample headroom for software bit-banging auxiliary protocols. Designers use the watchdog timer to reset the bridge if the host link drops unexpectedly, automatically re-initializing the peripheral interface.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PIC16C66-20E/SP — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PIC16C66-20/SP | PIC16C66-04E/SP | PIC16C66-04I/SO | PIC16C662-04I/P | PIC16C65B-04E/P |
|---|---|---|---|---|---|---|
| Package | 28-SPDIP | 28-SPDIP - same | 28-SPDIP - same | 28-SOIC wide body (not SPDIP) | 28-PDIP - same family, different peripheral set | 28-PDIP - same package |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| CPU Clock (Maximum) | 20 MHz | 20 MHz | 4 MHz (-80%) | 4 MHz (-80%) | 4 MHz (-80%) | 4 MHz (-80%) |
| Number of I/O | 22 | 22 | 22 | 22 | 22 | 33 (28-PDIP has different pinout mapping) |
| Operating Temperature | -40C to +125C (Extended) | 0C to +70C (Commercial) | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) |
| Memory Type | OTP EPROM (one-time programmable) | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM |
Diferenciadores clave
- Drop-in Flash alternative for legacy OTP designs (frente a PIC16C66-20E/SP vs PIC16C65B-04E/P)
- Extended temperature range option (frente a PIC16C66-20E/SP vs PIC16C66-20/SP)
- Same-brand drop-in for production modernization (frente a PIC16C66-20E/SP vs PIC16F66-I/SP)
Notas de diseño
The PIC16C66-20E/SP operates from 2.5V to 6.0V. Use a 100 nF ceramic decoupling capacitor placed within 5 mm of the VDD pin (pin 19), plus a 10 uF bulk capacitor on the supply rail. The brown-out reset (BOR) module should be enabled in the configuration word to hold the MCU in reset when VDD falls below the BOR threshold - this prevents code execution at insufficient voltage, which can corrupt EEPROM data on peripheral devices. Estimated: at 5V/20 MHz active current is approximately 15-20 mA typical, so a 5V/100 mA LDO such as MCP1700 provides ample headroom.
Place the crystal oscillator (or ceramic resonator) within 10 mm of pins 8 (OSC1) and 9 (OSC2) with short, symmetrical traces to minimize parasitic capacitance and EMI pickup. For 20 MHz operation use a fundamental-mode crystal with 15-33 pF load capacitors matched to the crystal's specified load capacitance. Keep crystal traces away from switching signals and away from the MCLR/VPP pin trace to avoid noise coupling. Ground the oscillator's body to the ground plane directly under the device for shielding.
OTP EPROM memory cannot be re-programmed in-circuit - any firmware bug after programming requires device replacement. Plan firmware revision strategy accordingly: develop on a Flash-based PIC16F66-I/SP first, then port the final code to PIC16C66-20E/SP for production. The CONFIG word must be programmed before code execution to enable the watchdog timer, brown-out reset, and oscillator mode. Failure to set CONFIG bits properly is the most common cause of non-functional PIC16C66 prototypes.
The 22 I/O pins have TTL-compatible input thresholds and CMOS-compatible output drive. PORTB internal weak pull-ups (typically 50-400 uA) are enabled per-pin via the RBPU bit in the OPTION register and are useful for switch inputs. The MSSP I2C pins (RC3/SCL, RC4/SDA) are open-drain and require external pull-up resistors (typically 4.7 kohm for 100 kHz, 2.2 kohm for 400 kHz). The USART pins (RC6/TX, RC7/RX) drive CMOS levels - use a MAX232 or MCP2200 for RS-232 level translation.
Información de cumplimiento
RoHS compliance status not stated in the verified data. The PIC16C66-20E/SP is NOT AEC-Q100 qualified - for safety-critical automotive applications use a dedicated automotive MCU family. Production status is Active per Microchip but with limited distributor stock due to OTP build-to-order scheduling.
