PIC12LC671-04/SM - 4MHz 8-Bit CMOS MCU with ADC | Microchip
N.º da peça: PIC12LC671-04/SM ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.85 | $2,85 |
| 10 | $2.56 | $25,60 |
| 100 | $2.27 | $227,00 |
| 500 | $1.95 | $975,00 |
| 1.000 | $1.72 | $1.720,00 |
PIC12LC671-04/SM Visão geral
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + data), and peripherals such as ADC, timers and I/O ports. Within Microchip's taxonomy, the PIC12C67x family belongs to the PIC10/12/16 mid-range 8-bit architecture, which sits beneath the PIC18 high-tier 8-bit family and the PIC24/dsPIC 16-bit families in Microchip's broader 8-bit -> 16-bit -> 32-bit microcontroller hierarchy. The mid-range core uses a 14-bit instruction word and Harvard architecture, delivering deterministic interrupt response and predictable timing for real-time control applications.
Key features include four-channel 8-bit ADC, two analog comparators, a 16-bit timer/counter with programmable prescaler, an 8-bit timer/counter, internal watchdog timer with on-chip RC oscillator, and 4 MHz maximum operating frequency. The device supports in-circuit serial programming (ICSP) via GP0/GP1, allowing firmware to be programmed after PCB assembly. Power management features include selectable oscillator modes and a power-saving sleep mode with wake-up via I/O change or watchdog timer overflow.
Typical applications include battery-powered sensor interfaces, automotive body electronics (where the "LC" extended voltage range is valuable), consumer appliance controllers, simple closed-loop fan control, and low-cost analog data acquisition. The combination of on-chip ADC and very low cost makes this part a common choice for replacement of discrete analog signal chains in cost-sensitive products.
When designing with this device, engineers should note that OTP memory cannot be reprogrammed; for prototyping the JW (ceramic windowed) or -I (industrial temperature) variants are typically preferred. The SOIJ package offers a slightly smaller footprint than standard SOIC while remaining hand-solderable with appropriate tooling.
Alternativas drop-in para PIC12LC671-04/SM — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com PIC12LC671-04/SM (mesmo formato e footprint) — diferindo em Package, Timers, RoHS Status, ADC, Mounting Type.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PIC12LC671-04I/SM
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC12C671-04/SM
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC12C671-04I/SM
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
PIC12CE674-04/SM
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
PIC12C672-04/SM
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$3.1 / unidade
Ver ficha técnica →PIC12F675-I/SM
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC12LC671-04/SM Classificações máximas e características elétricas
| Core Architecture | PIC 8-bit RISC (mid-range, 14-bit instruction word) |
| Program Memory | 1.75 KB (1K x 14) OTP |
| Data RAM | 128 bytes |
| EEPROM (data) | None (CE variants only) |
| Max CPU Frequency | 4 MHz |
| I/O Pins | 6 (GPIO) |
| ADC | 8-bit, 4 channels |
| Comparators | 2 analog comparators |
| Timers | 1x 16-bit Timer/Counter + 1x 8-bit Timer/Counter |
| Watchdog Timer | Yes, with internal RC oscillator |
| In-Circuit Programming | ICSP supported via GP0/GP1 |
| Encapsulamento | 8-pin SOIJ (SM), 5.30 mm body width |
| Temperatura de operação | Commercial: 0C to +70C (industrial -I variant: -40C to +85C) |
| Status RoHS | Compliant (post-2005 manufacture) |
Configuração de pinos do PIC12LC671-04/SM
| Pino 1 | VDD — Positive supply voltage (2.5V to 5.5V for LC variant) |
| Pino 2 | GP5/OSC1/CLKIN — General-purpose I/O / oscillator input / external clock input |
| Pino 3 | GP4/OSC2/CLKOUT — General-purpose I/O / oscillator output / clock output |
| Pino 4 | GP3/MCLR/VPP — General-purpose I/O / master clear reset (active low) / ICSP programming voltage |
| Pino 5 | GP2/AN2/T0CKI/INT — General-purpose I/O / analog channel 2 / Timer0 clock input / external interrupt |
| Pino 6 | GP1/AN1/VREF/ICSPCLK — General-purpose I/O / analog channel 1 / ADC voltage reference / ICSP clock |
| Pino 7 | GP0/AN0/ICSPDAT — General-purpose I/O / analog channel 0 / ICSP data |
| Pino 8 | VSS — Ground reference |
Aplicações típicas
PIC12LC671-04/SM é adequado para 6 aplicaçãos: Battery-Powered Sensor Interface, Simple Closed-Loop Fan Controller, Automotive Body Electronics, Consumer Appliance Control, Low-Cost Analog Data Acquisition, Smart Home Sensor Node.
Battery-Powered Sensor Interface
The PIC12LC671-04/SM is well-suited to battery-powered sensor interfaces because its 2.5 V minimum supply voltage enables direct operation from 2x AA alkaline cells across their full discharge curve. The integrated 8-bit 4-channel ADC reads thermistor, photocell, or voltage-divider sensors with no external signal conditioning, while the 16-bit timer/counter drives PWM output for actuator or LED control. At 4 MHz the device draws only a few hundred microamperes active, and the sleep mode with watchdog wake-up achieves quiescent currents below 1 microampere for multi-year battery life in wireless sensor nodes and remote controls.
Recomendado
Simple Closed-Loop Fan Controller
In small fan controllers, the PIC12LC671-04/SM uses its on-chip 8-bit ADC to read a thermistor or external temperature sensor and adjusts PWM duty cycle on one GPIO to drive the fan MOSFET. The two analog comparators can implement hardware over-temperature protection independent of firmware, providing fail-safe shutdown if firmware locks up. The 4 MHz core is sufficient for PID control loops at typical thermal time constants, and the 8-SOIJ package fits into space-constrained fan hubs. Industrial-temperature variants are recommended for fan controller PCBs mounted near hot heatsinks.
Recomendado
Automotive Body Electronics
The PIC12LC671-04/SM is commonly used in low-end automotive body electronics such as interior lighting controllers, simple switch debouncers, and seat position indicators. Its ability to operate directly from a 5 V regulated rail and read multiple analog switch positions via the ADC eliminates discrete analog multiplexer ICs. The 16-bit timer can debounce mechanical switches or generate precise timing for relay drivers. For underhood applications, the industrial-temperature PIC12LC671-04I/SM variant is recommended. Note: this part is not AEC-Q100 qualified, so designers should validate the full BOM against their automotive EMC and environmental requirements.
Recomendado
Consumer Appliance Control
The PIC12LC671-04/SM is widely used in cost-sensitive consumer appliances such as coffee makers, toaster ovens, and small kitchen devices where its integrated ADC reads temperature or humidity sensors and the 16-bit timer generates precise cooking-cycle timing. The 1.75 KB OTP memory holds simple state-machine firmware, and the 8-SOIJ package fits in compact appliance enclosures. The 2.5 V minimum supply allows operation from rectified 5 V supplies without additional regulation. Industrial-temperature variants support under-cabinet mounting where ambient temperature may exceed commercial ratings during operation.
Recomendado
Low-Cost Analog Data Acquisition
The PIC12LC671-04/SM serves as a low-cost 4-channel analog data logger for HVAC sensors, environmental monitors, and industrial process inputs. Its 8-bit ADC samples at rates up to several tens of kilohertz, sufficient for thermocouple cold-junction compensation or 4-20 mA loop readout when paired with a sense resistor. With 128 bytes of RAM, the device can buffer several seconds of averaged data before requiring host transfer via a UART-implemented GPIO bit-bang or dedicated communication pin. The combination of ADC, two comparators, and timers in a single 8-pin package replaces multiple discrete analog ICs in cost-optimized designs.
Recomendado
Smart Home Sensor Node
The PIC12LC671-04/SM is a strong fit for first-generation smart home sensor nodes such as door/window contact sensors, water leak detectors, and simple occupancy sensors. Its 2.5 V minimum supply voltage enables direct operation from CR2032 lithium coin cells, while the watchdog timer with internal RC oscillator handles wake-up cycles for multi-year battery life. The integrated 8-bit ADC reads resistive sensors directly, and the 6 GPIO pins control a low-power RF transmitter or drive a piezo buzzer. For new designs, Microchip recommends the PIC12F675 successor with flash memory and internal oscillator for BOM reduction.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PIC12LC671-04/SM — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | PIC12LC671-04I/SM | PIC12C671-04/SM | PIC12C671-04I/SM | PIC12F675-I/SM |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 8-SOIJ (SM) | 8-SOIJ (SM) - same | 8-SOIJ (SM) - same | 8-SOIJ (SM) - same | 8-SOIJ (SM) - same |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB Flash |
| Data RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 64 bytes |
| ADC Resolution | 8-bit | 8-bit | 8-bit | 8-bit | 10-bit |
| Operating Voltage Range | 2.5V to 5.5V | 2.5V to 5.5V | 4.0V to 6.0V | 4.0V to 6.0V | 2.0V to 5.5V |
| Temperature Grade | Commercial (0C to +70C) | Industrial (-40C to +85C) | Commercial | Industrial | Industrial |
| Internal Oscillator | No | No | No | No | Yes (4 MHz) |
Principais diferenciais
- Extended low-voltage operation down to 2.5 V (vs PIC12C671-04/SM)
- Industrial temperature grade option (vs PIC12LC671-04/SM (this part, commercial grade))
- Flash memory and internal oscillator in successor part (vs PIC12F675-I/SM)
Notas de projeto
Estimated: The PIC12LC671 supply current at 4 MHz active is approximately 2 mA at 5 V (10 mW). In sleep mode with watchdog disabled, current drops to under 1 microampere. For battery-powered designs, use the watchdog timer with internal RC oscillator (~38 kHz typical) to periodically wake the MCU, achieving average current below 10 microamperes depending on wake duty cycle. Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of pin 1.
Estimated: Route the ICSP programming signals GP0 (ICSPDAT) and GP1 (ICSPCLK) to an in-circuit programming header with a 100 kohm pull-down on MCLR/VPP to prevent spurious resets. Keep the MCLR trace short to minimize noise pickup. Place the decoupling capacitor on VDD close to pin 1, and provide a solid ground plane under the SOIJ package to reduce EMI. When using the ADC, route analog signals (GP0-GP2) away from digital switching signals to minimize coupling.
Estimated: Do not confuse the LC and C variants - the LC operates from 2.5 V to 5.5 V while the standard C requires 4.0 V to 6.0 V. OTP memory can be programmed only once, so validate all firmware on a JW (windowed) ceramic prototype before committing to production. When migrating to PIC12F675 as Microchip recommends, note that the F variant has 64 bytes RAM (vs 128) and a 10-bit ADC (vs 8-bit), which may require firmware adjustments. The ICSP programming connector must be isolated from the rest of the circuit during programming to prevent load-induced programming failures.
Informações de conformidade
RoHS and lead-free per Microchip product page. Not AEC-Q100 qualified - the industrial-temperature I variant is not automotive-qualified either. For AEC-Q100 designs, use PIC16F1823 or similar.
