PIC16LC66-04I/SO - 8-bit 4MHz 14KB OTP MCU 28-SOIC | Microchip
料号： PIC16LC66-04I/SO ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.36 | $4.36 |
| 10 | $3.92 | $39.20 |
| 100 | $3.49 | $349.00 |
| 500 | $3.1 | $1,550.00 |
| 1,000 | $2.78 | $2,780.00 |
PIC16LC66-04I/SO 概述
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/OTP/Flash), data memory (RAM), and programmable I/O peripherals. Within the broader semiconductor taxonomy, the PIC16LC66-04I/SO sits in the microcontroller hierarchy: microcontroller -> embedded controller -> integrated circuit -> semiconductor. The 'LC' suffix denotes the low-voltage CMOS variant of the PIC16C66 family, optimized for battery-powered and low-power embedded designs where 5V rails are not available.
Key differentiating features include three timer/counter blocks (8-bit Timer0 with prescaler, 16-bit Timer1 with prescaler and external crystal/clock sleep-mode increment capability, and 8-bit Timer2), a synchronous/asynchronous serial port (USART), an 8-bit parallel slave port, and an on-chip 8-bit ADC with multiple input channels. The integrated watchdog timer and programmable code protection enhance field reliability for unattended industrial nodes.
The RISC architecture delivers deterministic execution, predictable interrupt latency, and low interrupt latency - a critical requirement for real-time control loops. The Harvard bus separates instruction and data paths so the next instruction can be prefetched while the current instruction executes data operations, sustaining near-1 MIPS/MHz throughput.
Typical applications include industrial control subsystems, motor control peripheral boards, sensor signal conditioning front-ends, low-power instrumentation, remote sensor nodes, and embedded user-interface controllers. The wide 2.5V to 6.0V operating range simplifies battery-backed and 3.3V/5V mixed-rail designs without level shifting.
Design consideration: when migrating legacy designs to this part, note that OTP memory is one-time programmable and cannot be erased - prototype code should be validated on a windowed CERDIP (JW) variant, then committed to the SOIC OTP for production. Always confirm the part is still active on Microchip's product page before committing to new designs, as PIC16C OTP parts are mature and may approach end-of-life.
This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet - intended as a decision-support complement to the official Microchip PIC16C66 datasheet for engineers selecting or sourcing this legacy MCU.
直接替换替代料： PIC16LC66-04I/SO ——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： PIC16LC66-04I/SO （相同外形与封装尺寸） ——差异在于 Program Memory Size, Core Architecture, Package, Operating Temperature, RAM Size.
快速对比工具——选择替代料号进行并排对比：
PIC16LC66-04/SO
✅ 直接替换✓ 有现货
$2.4 / 个
查看数据手册 →PIC16LC66-04I/SP
✅ 直接替换✓ 有现货
$3.65 / 个
查看数据手册 →PIC16F76-I/SO
✅ 直接替换✓ 有现货
$2.1 / 个
查看数据手册 →PIC16F876A-I/SO
✅ 直接替换📋 参考替代料（不在目录中）
PIC16LC66-04I/SO 最大额定值与电气特性
| Core Architecture | PIC 16C, 8-bit RISC |
| Program Memory Size | 14 KB (8K x 14) OTP |
| RAM Size | 368 bytes (368 x 8) |
| 最大时钟频率 | 4 MHz |
| 工作电源电压 | 2.5 V to 6.0 V |
| Number of I/O Pins | 22 |
| 封装 | 28-pin SOIC (SO) |
| 安装类型 | Surface Mount |
| 工作温度范围 | -40 C to +85 C (Industrial) |
| Instruction Set | 35 single-word instructions |
| Instruction Cycle Time | 1 cycle (branches 2 cycles) |
| ADC | 8-bit, multi-channel on-chip |
| Timers | Timer0 (8-bit), Timer1 (16-bit), Timer2 (8-bit) |
| Communication | USART (SCI), 8-bit Parallel Slave Port |
| Watchdog Timer | Yes, on-chip |
| ROM/Program Type | OTP (One-Time Programmable) |
| RoHS 状态 | Compliant |
PIC16LC66-04I/SO 引脚配置
| 引脚 1 | RA0/AN0 — Port A bit 0 / analog input 0 |
| 引脚 2 | RA1/AN1 — Port A bit 1 / analog input 1 |
| 引脚 3 | RA2/AN2 — Port A bit 2 / analog input 2 |
| 引脚 4 | RA3/AN3/VREF — Port A bit 3 / analog input 3 / voltage reference |
| 引脚 5 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| 引脚 6 | RA5/AN4/SS — Port A bit 5 / analog input 4 / slave select |
| 引脚 7 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| 引脚 8 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| 引脚 9 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock |
| 引脚 10 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 |
| 引脚 11 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM 1 |
| 引脚 12 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| 引脚 13 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| 引脚 14 | RC5/SDO — Port C bit 5 / SPI data out |
| 引脚 15 | RC6/TX/CK — Port C bit 6 / USART TX / USART clock |
| 引脚 16 | RC7/RX/DT — Port C bit 7 / USART RX / USART data |
| 引脚 17 | RB7/PGD — Port B bit 7 / ICSP data |
| 引脚 18 | RB6/PGC — Port B bit 6 / ICSP clock |
| 引脚 19 | RB5 — Port B bit 5 |
| 引脚 20 | RB4 — Port B bit 4 |
| 引脚 21 | RB3/PGM — Port B bit 3 / LVP programming |
| 引脚 22 | RB2 — Port B bit 2 |
| 引脚 23 | RB1 — Port B bit 1 |
| 引脚 24 | RB0/INT — Port B bit 0 / external interrupt |
| 引脚 25 | VSS — Ground |
| 引脚 26 | VDD — Positive supply |
| 引脚 27 | MCLR/VPP — Master clear reset / programming voltage |
| 引脚 28 | RE0/RD/AN — Port E bit 0 / parallel slave port read / analog |
典型应用
PIC16LC66-04I/SO 适用于 6 应用s: Industrial Control Subsystems, Sensor Signal Conditioning Front-Ends, Low-Power Instrumentation, Motor Control Peripheral Boards, Embedded User Interface Controllers, Remote Sensor Nodes.
Industrial Control Subsystems
The PIC16LC66-04I/SO is well-suited for industrial control subsystems where moderate program complexity (14 KB OTP) and 22 GPIO pins are sufficient for sensor aggregation and actuator control. Its 2.5V to 6.0V supply range accommodates both 3.3V sensor rails and 5V driver stages directly, eliminating level shifters. The 8-bit ADC on-chip handles analog sensor inputs, while the 16-bit Timer1 with external crystal/clock-in-sleep capability enables precise interval timing even in low-power modes. Industrial-grade -40C to +85C operation ensures field reliability. Pair with external RS-485 transceivers for multi-drop industrial networks.
推荐
Sensor Signal Conditioning Front-Ends
Use the PIC16LC66-04I/SO as a sensor front-end MCU that digitizes analog signals via its 8-bit ADC, performs linearization, and forwards processed data over the on-chip USART. The 4 MHz clock and deterministic instruction timing support 1-2 kHz sample rates per channel, adequate for thermocouple, strain-gauge, and process-variable conditioning. The wide 2.5V-6.0V supply range simplifies battery-backed designs where the same MCU runs directly from 3.6V lithium packs. The 368-byte RAM is sufficient for circular sample buffers; the 14KB OTP holds calibration tables and lookup routines.
推荐
Low-Power Instrumentation
The PIC16LC66-04I/SO's low-voltage LC variant draws minimal current at reduced clock rates, making it a strong fit for battery-powered instrumentation such as portable data loggers, handheld meters, and remote sensor pods. Operating down to 2.5V lets the system run directly from two AA alkaline cells without boost converters. Timer1 can be clocked from an external 32.768 kHz crystal during sleep, providing a real-time clock with nanoamp-level sleep current. The OTP memory reduces unit cost versus flash parts in volume production where firmware is frozen.
推荐
Motor Control Peripheral Boards
Deploy the PIC16LC66-04I/SO as a peripheral controller for stepper or brushed-DC motor driver boards, where its 22 GPIO pins drive H-bridge logic, encoder inputs, and fault-feedback lines. The 8-bit PWM capability (via Timer2) supports commutation and speed control loops, while the USART links to a host controller for command and telemetry. Industrial temperature rating enables under-hood and outdoor installations. The 4 MHz maximum clock is adequate for closed-loop control at typical motor PWM frequencies; pair with dedicated gate drivers for high-current switching.
推荐
Embedded User Interface Controllers
The PIC16LC66-04I/SO can drive small user-interface subsystems - keypads, LED indicators, character LCDs, and rotary encoders - where its 22 GPIO lines map directly to a typical 4x4 matrix keypad plus LCD data bus. With 14KB OTP, designers can embed keypad scanning debouncing, menu navigation state machines, and simple text rendering. The USART enables command exchange with a host processor or PC interface. Operating from 2.5V to 6.0V makes it compatible with both 3.3V OLED modules and 5V LCDs without level translation.
推荐
Remote Sensor Nodes
The PIC16LC66-04I/SO serves as a low-cost controller for remote sensor nodes (utility metering, agricultural monitoring, environmental telemetry) where cost per node dominates the BOM and firmware is finalized. Its 2.5V minimum supply lets the node run from primary lithium thionyl-chloride cells with no boost converter. The on-chip 8-bit ADC, three timers, and USART cover typical sensor-pod I/O. OTP memory prevents field firmware tampering - a benefit for metering infrastructure. Industrial temperature rating supports outdoor enclosures. Pair with low-power radios for wireless mesh networks.
推荐
推荐产品汇总
工程参考数据： PIC16LC66-04I/SO ——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 | PIC16LC66-04/SO | PIC16LC66-04I/SP | PIC16F76-I/SO | PIC16F876A-I/SO |
|---|---|---|---|---|---|
| Package | 28-SOIC (SO) | 28-SOIC (SO) - same | 28-SPDIP (SP) - through-hole | 28-SOIC (SO) - same | 28-SOIC (SO) - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Program Memory | 14 KB OTP | 14 KB OTP | 14 KB OTP | 14 KB Flash (reprogrammable) | 14 KB Flash + ICD |
| RAM Size | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 368 bytes |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 20 MHz (faster) | 20 MHz (faster) |
| Supply Voltage | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| I/O Pins | 22 | 22 | 22 | 22 | 22 |
| Operating Temperature | -40 C to +85 C (Industrial) | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
关键差异点
- Wide low-voltage supply range enables direct battery operation （对比 PIC16C66-04/P (standard voltage variant))
- Industrial temperature grade for field deployment （对比 PIC16LC66-04/SO (commercial temperature))
- Surface-mount 28-SOIC package for compact designs （对比 PIC16LC66-04I/SP (28-SPDIP through-hole))
设计说明
The PIC16LC66-04I/SO's wide 2.5V to 6.0V supply range lets the MCU run directly from 3.3V or 5V rails without a regulator. Place a 0.1 uF decoupling capacitor within 5 mm of the VDD pin (pin 26) and an additional 10 uF bulk capacitor near the supply entry point. For battery-powered designs, the LC variant's low-voltage operation enables direct connection to two AA alkaline cells (nominally 3.0V). Brown-out reset should be enabled in configuration bits to prevent undefined behavior during voltage dips below 2.5V.
OTP (One-Time-Programmable) memory cannot be erased after programming - a programming error bricks the device. Always validate firmware on a windowed CERDIP (JW) variant or a flash-based PIC16F76-I/SO before committing to OTP production parts. Also note the I-suffix denotes industrial temperature grade (-40C to +85C); the non-I PIC16LC66-04/SO is commercial (0C to +70C) and will malfunction outside that range. Verify your application's worst-case ambient before selecting the suffix.
For the 28-SOIC package, follow standard SOIC PCB layout practices: route the ICSP pins (RB6/PGC and RB7/PGD) with short, parallel traces to a 6-pin ICSP header for in-system programming access. Place the decoupling capacitor (0.1 uF ceramic) immediately adjacent to VDD pin 26, with the ground return via the shortest path to the VSS pin 25 plane. Keep the MCLR/VPP pin pulled high through a 10 kohm resistor, with a 100 nF cap to ground for noise immunity, unless external reset control is needed.
The PIC16LC66-04I/SO's parallel slave port (PSP) pins (RE0/RD/AN, RC0-RC7) share functionality with general-purpose I/O. When PSP is enabled, avoid using these pins for time-critical GPIO; instead, allocate dedicated I/O for interrupt sources and Timer inputs. The 8-bit ADC shares analog input pins with Port A and Port E; configure ADCON1 to enable only the channels in use, leaving unused channels tied to a defined voltage (GND or VDD) to minimize input leakage.
合规信息
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - this is a general-purpose MCU, not automotive-grade. Lead-free reflow profile JEDEC J-STD-020 compatible.
