PIC12LC671T-04I/MF - 4MHz 8-Bit MCU 1.75KB OTP | Microchip
MPN： PIC12LC671T-04I/MF ✗ 停產PIC12LC671T-04I/MF 概覽
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals on one die. The PIC12LC67X family belongs to the PIC microcontroller hierarchy: MCU -> 8-bit MCU -> RISC MCU -> PIC architecture -> PIC12 family -> PIC12LC67X sub-family. These MCUs use a Harvard architecture with separate program and data buses, allowing single-cycle instruction execution with deterministic timing - critical for real-time control loops.
The device offers 64 bytes of RAM, a hardware USART/SCI interface (asynchronous and synchronous serial), and four analog input channels multiplexed to an 8-bit successive-approximation ADC. The internal 4MHz RC oscillator and on-chip reset circuitry eliminate most external components. The 'L' suffix denotes the low-voltage (2.5V) variant versus the standard PIC12C671 (3.0V minimum), while 'T' indicates tape-and-reel packaging and 'MF' designates the 8-pin DFN-S (6x5 mm) package with exposed pad.
Typical applications include battery-powered sensor nodes, automotive interior lighting, small appliance control, smart metering, and remote-control transmitters. The 4MHz operation, low cost, and compact DFN footprint make it attractive for high-volume consumer products where board space and BOM cost dominate.
When designing with this part, note that OTP memory cannot be reprogrammed - firmware must be verified before production programming. The industrial -40C to +85C temperature grade allows deployment in harsh environments, but engineers should derate clock speed above 70C if ADC accuracy matters.
This page synthesizes distributor stock, datasheet parameters, drop-in same-family alternatives, and practical design notes not consolidated on the manufacturer product page.
直接替換替代品，適用於 PIC12LC671T-04I/MF — 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： PIC12LC671T-04I/MF （相同外形與佔位） — 差異在於 Data EEPROM, ADC, Core Architecture, I/O Pins, Maximum CPU Speed.
PIC12C671-04I/MF
✅ 直接替換聯絡詢價
查看資料表 →PIC12CE671-04I/MF
✅ 直接替換📋 參考替代品（不在目錄中）
PIC12F675-I/MF
✅ 直接替換聯絡詢價
查看資料表 →PIC12F683-I/MF
✅ 直接替換📋 參考替代品（不在目錄中）
PIC12LC671T-04I/MF 最大額定值與電氣特性
| Core | PIC 8-bit RISC |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 1.75 KB (1K x 14) |
| Data RAM | 64 bytes |
| Data EEPROM | Not present (C671 base family, not CE67X) |
| 最大時脈頻率 | 4 MHz |
| Instruction Set | PIC12C67X (33 instructions, 12-bit opcode) |
| Operating Voltage Range | 2.5 V to 5.5 V (LC variant) |
| I/O Pins | 6 |
| ADC | 8-bit, 4 channels |
| Timers | 1 x 8-bit (TMR0) + Watchdog Timer (WDT) |
| Serial Interface | AUSART (async/sync) |
| 封裝 | 8-DFN-S (6x5 mm) with exposed pad (MF) |
| 工作溫度 | -40 C to +85 C (industrial, 'I' suffix) |
| 安裝類型 | Surface Mount |
PIC12LC671T-04I/MF 腳位配置
| 腳位 1 | GP5/MCLR/VPP — General-purpose I/O / Master Clear reset / Programming voltage input |
| 腳位 2 | GP0/AN0 — General-purpose I/O / Analog input channel 0 |
| 腳位 3 | GP1/AN1 — General-purpose I/O / Analog input channel 1 |
| 腳位 4 | GP2/AN2/T0CKI — General-purpose I/O / Analog input channel 2 / Timer0 clock input |
| 腳位 5 | VSS — Ground reference |
| 腳位 6 | GP3/AN3 — General-purpose I/O / Analog input channel 3 (input only) |
| 腳位 7 | VDD — Positive supply voltage (2.5V to 5.5V) |
| 腳位 8 | GP4/AN4/OSC2/CLKOUT — General-purpose I/O / Analog input channel 4 / Oscillator output / Clock output |
典型應用
PIC12LC671T-04I/MF 適用於 6 應用s: Battery-Powered Sensor Nodes, Automotive Interior Lighting Control, Small Appliance Control (Coffee Makers, Fans), Smart Metering and Utility Endpoints, Remote Control Transmitters (RF/IR), Industrial Sensor Signal Conditioning.
Battery-Powered Sensor Nodes
The PIC12LC671T-04I/MF is a strong fit for battery-powered sensor nodes because its low 2.5V minimum supply enables direct connection to single-cell Li-ion (3.0V-4.2V) or 3V coin-cell batteries without a boost converter. The integrated 4-channel 8-bit ADC samples up to four sensor inputs (temperature, light, voltage, current), and the 4MHz execution rate with PIC RISC architecture delivers deterministic 1us instruction cycles for tight sampling loops. Typical quiescent draw is sub-microamp in sleep mode. Trade-off vs switching regulators: no EMI noise injection into analog front-end, but no onboard EEPROM means calibration constants must be reloaded from OTP shadow or external memory on every wake.
推薦
Automotive Interior Lighting Control
The PIC12LC671T-04I/MF fits interior lighting modules where 6 I/O pins are sufficient to drive 2-3 LED channels plus a switch/dimmer input. The AUSART peripheral supports LIN-bus slave communication when paired with an external LIN transceiver like the MCP2021. Its -40C to +85C industrial temperature grade covers cabin conditions but not under-hood AEC-Q100 environments. The 4MHz clock provides enough headroom for PWM dimming at 1kHz with 8-bit resolution. Note: PIC12LC671 is NRND; for new automotive interior designs, prefer PIC16F1823 or PIC12F1822 with AEC-Q100 grade.
推薦
Small Appliance Control (Coffee Makers, Fans)
The PIC12LC671T-04I/MF is widely used in small kitchen and home appliances where cost dominates and firmware is locked. With 6 I/O, designers can directly drive relays, read a single rotary encoder, and monitor temperature via the 8-bit ADC. The OTP memory is appropriate for fixed-function appliances - manufacturers program production firmware once and ship without firmware-update burden. The 4MHz clock executes control loops in microseconds, fast enough for closed-loop heater regulation. For new designs, PIC12F675-I/MF provides Flash-based flexibility for late-stage firmware tuning without OTP mask changes.
推薦
Smart Metering and Utility Endpoints
The PIC12LC671T-04I/MF serves as the MCU core in low-end smart meters and remote utility endpoints where its low 2.5V minimum supply supports 3V lithium battery backup for tamper detection. The AUSART interface streams metering pulses to a wireless module or PLC link. The 64-byte RAM is sufficient for accumulating pulse counts and time-stamping events before buffered transmission. The industrial -40C to +85C range covers outdoor meter enclosures in most climates. Designers should add an external EEPROM (e.g., 24LC01) for non-volatile log storage, since the PIC12LC671 itself has no on-chip EEPROM.
推薦
Remote Control Transmitters (RF/IR)
The PIC12LC671T-04I/MF is a popular choice for fixed-code RF and IR remote controls where its 1.75KB OTP holds compact transmit protocols and button-debounce logic. The AUSART generates precise IR carrier frequencies, while the 4MHz clock drives accurate timing for Manchester or PWM-encoded RF frames. The 6 I/O accommodate 4-8 matrix-scanned buttons plus an LED indicator. Low power consumption (sub-1mA active, sub-uA sleep) extends battery life. For learning remotes, PIC12F675 Flash is preferred to allow user code storage and updates.
推薦
Industrial Sensor Signal Conditioning
The PIC12LC671T-04I/MF is well-suited as a low-cost signal-conditioning front-end for industrial sensors, digitizing 4 analog inputs and retransmitting via AUSART to a host PLC or microcontroller. The 8-bit ADC provides 0.2% resolution adequate for status monitoring, not precision measurement. The -40C to +85C industrial grade handles factory-floor temperature swings. For new sensor-conditioning designs, prefer PIC12F1822-I/MF (Flash, 10-bit ADC, 32MHz internal oscillator) for higher precision and field-upgradeable calibration constants.
推薦
推薦產品摘要
工程參考資料，適用於 PIC12LC671T-04I/MF — 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 | PIC12C671-04I/MF | PIC12CE671-04I/MF | PIC12F675-I/MF | PIC12F683-I/MF | ATtiny13A-MU |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology (Atmel) |
| Package | 8-DFN-S (6x5 mm) | 8-DFN-S (6x5 mm) - same | 8-DFN-S (6x5 mm) - same | 8-DFN-S (6x5 mm) - same | 8-DFN-S (6x5 mm) - same | 8-QFN/MLF (3x3 mm) - smaller |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1 KB Flash | 2 KB Flash | 1 KB Flash |
| RAM | 64 bytes | 64 bytes | 64 bytes | 128 bytes | 128 bytes | 64 bytes |
| EEPROM | None | None | 16 bytes | 128 bytes Flash-emulated | 256 bytes Flash-emulated | 64 bytes |
| Minimum Operating Voltage | 2.5 V | 3.0 V | 3.0 V | 2.0 V | 2.0 V | 1.8 V |
| ADC Resolution | 8-bit, 4 channels | 8-bit, 4 channels | 8-bit, 4 channels | 10-bit, 4 channels | 8-bit, 4 channels | 10-bit, 4 channels |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 20 MHz (internal 4MHz RC) | 20 MHz (internal 8MHz RC) | 20 MHz (internal 9.6MHz RC) |
| Internal Oscillator | No (external RC/xtal required) | No | No | Yes (4 MHz) | Yes (8 MHz) | Yes (9.6 MHz) |
| Lifecycle Status | NRND | NRND | NRND | Active | Active | Active |
主要差異化特點
- Lowest minimum operating voltage in PIC12C671 family (對比PIC12C671-04I/MF)
- Adds on-chip EEPROM for data persistence (對比PIC12CE671-04I/MF)
- Flash memory enables field updates and late-stage firmware tuning (對比PIC12F675-I/MF)
- Active lifecycle vs NRND on the PIC12LC671 (對比PIC12F675-I/MF)
設計說明
Estimated: At VDD=3.3V and 4MHz active clock, the PIC12LC671 core draws approximately 2mA; in sleep mode this drops to sub-1uA with WDT disabled. For battery applications using a CR2032 coin cell (~220mAh), budget for a 1uA average draw to achieve 7+ year battery life. The PIC12LC671's low 2.5V minimum supply allows direct connection to depleted Li-ion cells down to ~5% state-of-charge, extending usable runtime. Add a 100nF decoupling capacitor within 5mm of the VDD pin.
OTP memory cannot be erased or reprogrammed. Once the part is programmed with buggy firmware, every unit must be discarded. Always validate firmware on a Flash-based equivalent (e.g., PIC12F675) before committing to OTP production. Also note that GP3 is input-only on this family - do not configure it as an output, or the I/O driver will fight the internal pull-up and may damage the pin.
The 8-DFN-S (6x5 mm) package has an exposed thermal pad on the underside that must be soldered to a PCB land pad tied to VSS. Per the Microchip package drawing, the land pad should be at least 50% of the package body area and use multiple thermal vias to the inner ground plane. This both improves thermal dissipation (theta_JA drops from ~80 C/W to ~40 C/W) and provides mechanical solder-joint reliability under thermal stress.
The 8-bit ADC has an acquisition time of approximately 20us. Add a 100nF ceramic bypass cap on each analog input (AN0-AN3) within 5mm of the pin, plus a 10k-100k series resistor at the ADC input to limit peak current during sampling. For best ADC accuracy, AVdd should be tied to VDD with a separate 10uH ferrite bead and 10uF+100nF decoupling network to isolate digital switching noise from the analog reference.
合規資訊
RoHS, REACH, lead-free, and halogen-free status not explicitly stated in the provided Verified Web Data snippets - marked 'unknown' per Data Authenticity Rule 2. AEC-Q100: this part is industrial-grade (-40C to +85C) only and is NOT AEC-Q100 qualified; choose AEC-Q100 PIC16F1823 for automotive. Conflict-minerals: Microchip publishes a CMRT declaration covering the PIC family.
