PIC16C66-04E/SP - 8-Bit 4MHz 14KB OTP MCU | Microchip
MPN： PIC16C66-04E/SP ✓ 啟用中PIC16C66-04E/SP 概覽
A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, working RAM, and peripherals. Within the broader category, the PIC16C66 sits in the mid-range 8-bit family, hierarchically positioned as: 8-bit MCU -> mid-range MCU -> RISC MCU -> PIC16C family -> PIC16C6x subgroup -> PIC16C66. The /SP suffix designates the SPDIP package, the /04 designator indicates a 4 MHz maximum oscillator frequency, and the E indicates the Extended operating temperature range (-40C to +125C).
Key features include 368 bytes of RAM, 192 bytes of EEPROM data memory, three timers (Timer0, Timer1, Timer2), a 10-bit multi-channel Analog-to-Digital Converter (ADC), a synchronous/asynchronous USART with 9-bit address masking, a Capture/Compare/PWM (CCP) module, and a watchdog timer (WDT) with its own on-chip RC oscillator. Brown-out Reset (BOR) and Power-on Reset (POR) circuitry enhance reliability in noisy supply environments.
The PIC16C66-04E/SP is built on Microchip's low-power, high-speed CMOS EPROM/ROM technology with a fully static design, enabling operation from 2.5V to 6.0V (4.0V to 5.5V for the -04 speed grade) with typical currents of 15 uA at 5V/4 MHz and 1 uA at 3V/32 kHz. Its RISC pipelined core executes most instructions in a single 200 ns cycle, achieving 5 MIPS at 4 MHz.
Typical applications include industrial control systems, automotive subsystems, appliance controllers, sensor interfacing, and low-cost embedded control. The Extended temperature grade and robust peripheral set make it especially suited for harsh-environment deployments.
A critical design consideration is the OTP program memory: once programmed, code cannot be erased. For development work, use a windowed CERDIP version (PIC16C66-04E/JW) or migrate to the Flash-based PIC16F76 in the same 28-pin footprint for production reprogrammability. Always place 100 nF decoupling capacitors close to VDD/VSS pins.
This page synthesizes distributor pricing, drop-in 28-pin SPDIP alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 PIC16C66-04E/SP — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC16C66-04E/SP （相同外形與佔位） — 差異在於 Core Architecture, Package, Program Memory Type, Operating Temperature Range, Mounting Type.
PIC16C66-04I/SP
✅ 直接替換📋 參考替代品（不在目錄中）
PIC16C66-04/SP
✅ 直接替換📋 參考替代品（不在目錄中）
PIC16C66-10I/SP
✅ 直接替換📋 參考替代品（不在目錄中）
PIC16C66-20E/SP
✅ 直接替換聯絡詢價
查看資料表 →PIC16C67-04E/SP
✅ 直接替換📋 參考替代品（不在目錄中）
PIC16F76-I/SP
✅ 直接替換聯絡詢價
查看資料表 →PIC16C66-04E/SP 最大額定值與電氣特性
| Core Architecture | PIC16C / 8-bit RISC |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 14 KB (8K x 14) |
| 最大時脈頻率 | 4 MHz |
| Instruction Set Width | 14-bit |
| RAM Size | 368 bytes |
| EEPROM Data Memory | 192 bytes |
| I/O Pins | 22 |
| Supply Voltage Range | 4.0 V to 5.5 V |
| 工作溫度範圍 | -40 C to +125 C (Extended) |
| ADC | 10-bit multi-channel |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Communication | USART (SCI) with 9-bit address masking |
| PWM Channels | 1 (CCP module) |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Brown-out Reset / POR | Yes |
| 封裝 | 28-SPDIP (0.300 inch / 7.62 mm) |
| 安裝類型 | Through-Hole |
| Instruction Count | 35 single-word instructions |
| Instruction Cycle Time | 200 ns at 4 MHz |
PIC16C66-04E/SP 腳位配置
| 腳位 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| 腳位 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| 腳位 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| 腳位 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| 腳位 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / ADC reference |
| 腳位 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| 腳位 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| 腳位 8 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| 腳位 9 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| 腳位 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock in |
| 腳位 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| 腳位 12 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| 腳位 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| 腳位 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| 腳位 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| 腳位 16 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| 腳位 17 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| 腳位 18 | VSS — Ground reference |
| 腳位 19 | VDD — Positive power supply (4.0 V to 5.5 V) |
| 腳位 20 | RB0/INT — PORTB bit 0 / External interrupt |
| 腳位 21 | RB1 — PORTB bit 1 |
| 腳位 22 | RB2 — PORTB bit 2 |
| 腳位 23 | RB3 — PORTB bit 3 |
| 腳位 24 | RB4 — PORTB bit 4 |
| 腳位 25 | RB5 — PORTB bit 5 |
| 腳位 26 | RB6/PGC — PORTB bit 6 / ICSP clock |
| 腳位 27 | RB7/PGD — PORTB bit 7 / ICSP data |
| 腳位 28 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| 腳位 29 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input 6 |
| 腳位 30 | RE2/CS/AN7 — PORTE bit 2 / Chip select / Analog input 7 |
典型應用
PIC16C66-04E/SP 適用於 7 應用s: Industrial Sensor Interface and Control, Automotive Subsystem Controllers, Appliance Control Boards, HVAC Climate Control Systems, Smart Card and Secure Access Readers, Low-Cost Data Acquisition and Logging, Power Supply and Battery Charger Controllers.
Industrial Sensor Interface and Control
The PIC16C66-04E/SP is well-suited to industrial sensor interfacing because its 10-bit multi-channel ADC and 22 digital I/O lines handle both analog inputs and discrete control signals in a single IC. With its 4 MHz RISC core delivering 5 MIPS and only 200 ns instruction cycles, the MCU can sample multiple sensors, run a closed-loop PID, and update outputs in real time. The Extended -40 C to +125 C temperature grade supports factory-floor and outdoor installations where commercial parts would fail.
推薦
Automotive Subsystem Controllers
Automotive body and chassis subsystems such as seat controllers, mirror actuators, lighting modules, and HVAC blend-door actuators are common applications for the PIC16C66-04E/SP. The Extended -40 C to +125 C temperature range covers under-hood and cabin environments, while Brown-out Reset and Power-on Reset protect against automotive supply transients and cranking dropouts. The CCP/PWM module drives actuators directly, and the USART interfaces with body-control LIN or K-line networks via an external transceiver.
推薦
Appliance Control Boards
White-goods appliance controllers - washing machines, dishwashers, microwave ovens, and refrigerators - frequently use PIC16C66-04E/SP-class MCUs to drive keypads, displays, motor triacs, and sensor inputs. The 14 KB OTP EPROM accommodates sophisticated state machines and user-interface code, while the on-chip EEPROM (192 B) stores calibration constants and user preferences across power cycles. The 28-SPDIP through-hole package is friendly to wave-soldered appliance boards and field replacement.
推薦
HVAC Climate Control Systems
Heating, ventilation, and air-conditioning (HVAC) climate controllers benefit from the PIC16C66-04E/SP's combination of multi-channel ADC (for temperature and humidity sensors), PWM outputs (for damper and valve actuators), and USART (for thermostat network links). The Extended temperature grade supports attic and outdoor installations, while Brown-out Reset tolerates the brown-outs typical of compressor-driven HVAC supplies. The 5 MIPS throughput easily handles PID climate loops and user-interface tasks.
推薦
Smart Card and Secure Access Readers
The PIC16C66-04E/SP can serve as the host MCU in low-to-medium-volume secure access readers, where its OTP EPROM protects embedded keys against read-back and its on-chip EEPROM stores user credentials or audit trails. The USART interfaces with external smart-card reader ICs, while the ADC reads tamper sensors. The Extended temperature grade supports outdoor reader housings. Note that for high-security deployments, choose a part with cryptographic hardware acceleration rather than software crypto.
推薦
Low-Cost Data Acquisition and Logging
Low-cost, multi-channel data-acquisition front-ends with local logging are a natural fit for the PIC16C66-04E/SP. The 10-bit ADC samples up to 8 analog channels, the 192-byte EEPROM offers non-volatile parameter storage, and the USART streams data to a host PC or external memory card. Brown-out Reset protects log integrity against supply glitches. For larger memory, pair with an external I2C EEPROM via the I/O lines; for higher sample rates, step up to the 20 MHz PIC16C66-20E/SP.
推薦
Power Supply and Battery Charger Controllers
The PIC16C66-04E/SP is used as the supervisory MCU in switch-mode power supplies and battery chargers where its ADC measures voltage and current, its PWM drives a power MOSFET via a gate driver, and its USART communicates with a system host. The on-chip watchdog timer with dedicated RC oscillator catches firmware hangs that could damage batteries or loads. The Extended temperature grade supports outdoor and under-hood charger installations.
推薦
推薦產品摘要
工程參考資料，適用於 PIC16C66-04E/SP — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC16C66-04I/SP | PIC16C66-04/SP | PIC16F76-I/SP |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SPDIP | 28-SPDIP - same | 28-SPDIP - same | 28-SPDIP - same |
| Program Memory | 14 KB OTP EPROM | 14 KB OTP EPROM | 14 KB OTP EPROM | 14 KB Flash |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 20 MHz |
| Operating Temperature | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) |
| RAM | 368 bytes | 368 bytes | 368 bytes | 368 bytes |
| ADC | 10-bit multi-channel | 10-bit multi-channel | 10-bit multi-channel | 10-bit multi-channel (8 channels) |
| Memory Reprogrammability | One-Time Programmable (OTP) | OTP | OTP | Flash (in-circuit reprogrammable) |
| Watchdog Timer | Yes | Yes | Yes | Yes |
主要差異化特點
- Extended temperature grade covers -40 C to +125 C (對比PIC16C66-04I/SP)
- Reprogrammable Flash memory for in-circuit updates (對比PIC16C66-04E/SP (this part))
- Doubles program memory to 16 KB for richer firmware (對比PIC16C67-04E/SP)
設計說明
Place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pin (pin 11) and VSS pin (pin 12), with traces kept short to minimize inductance. Add a bulk 10 uF tantalum or aluminum electrolytic capacitor on the VDD rail. For battery-powered designs, the PIC16C66-04E/SP draws approximately 15 uA at 5V/4 MHz and 1 uA at 3V/32 kHz in SLEEP mode, enabling multi-year battery life if wake-up events are infrequent.
The 28-SPDIP package has 0.100 inch (2.54 mm) pin pitch - through-hole friendly for prototype and low-volume production. Keep analog input traces short and away from digital switching signals to avoid ADC noise coupling. Place the crystal (or resonator) close to OSC1 (pin 8) and OSC2 (pin 9), with ground guard traces around the oscillator area. The MCLR pin (pin 1) requires a 10 kohm pull-up to VDD for normal operation.
Do not confuse the PIC16C66-04E/SP (4 MHz, Extended temperature) with the /I (Industrial) or base /SP variants - these have different temperature grades. The OTP EPROM cannot be erased or reprogrammed - once a bit is 0, it stays 0; this makes code revisions impossible in the field. For development, use a windowed CERDIP version (PIC16C66-04E/JW) or migrate to PIC16F76-I/SP for in-circuit reprogrammability. Always configure unused I/O pins as outputs to minimize supply current.
The 10-bit ADC requires adequate acquisition time (typically 20 us for 10k ohm source impedance). Add a small RC filter (100 ohm + 100 nF) on heavily loaded analog inputs to limit bandwidth. Enable the ADC interrupt and read the result in the ADC ISR rather than polling to avoid timing conflicts with PWM or USART peripherals. Use VREF+ tied to VDD only if supply noise is below 1 LSB; otherwise provide a clean external reference.
合規資訊
RoHS/REACH compliance not explicitly stated in verified web data. The PIC16C66-04E/SP uses OTP EPROM (not Flash), so AEC-Q100 is not commonly qualified for this family; check Microchip automotive-grade product list for PIC16C variants.
