PIC12C671-04/P - 8-Bit 4MHz OTP MCU w/ ADC | Microchip | PDIP-8
MPN: PIC12C671-04/P ✓ פעילPIC12C671-04/P סקירה
What is an 8-bit OTP microcontroller? An 8-bit OTP microcontroller is a small, low-cost, single-chip computer with a CPU datapath of 8 bits, on-chip non-volatile program memory that is one-time-programmable (can be written once and not erased), RAM for variables, integrated peripherals such as A/D converters, timers, and digital I/O. PIC microcontrollers sit within the broader taxonomy: 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC. The 12C family represents Microchip's mid-range baseline of OTP PIC MCUs in 8-pin packages.
The PIC12C671-04/P features a RISC CPU with only 35 single-word instructions, a hardware multiplier-free 8-bit ALU, 4MHz maximum clock at 4V-5.5V (or 10MHz at the same range for -10 speed grades), and DC to 4MHz operation at 3V-5.5V. On-chip peripherals include a 4-channel 8-bit ADC, an 8-bit timer/counter with 8-bit prescaler, a Watchdog Timer with its own on-chip RC oscillator, and a power-on reset. The 6 I/O pins are individually direction-controlled and provide 25mA source/sink capability per pin, sufficient to drive LEDs directly.
Typical applications for this device include low-cost consumer appliances, sensor signal conditioning with ADC readback, simple state machines for appliance control, battery chargers, automotive interior accessories (non-AEC-Q100 qualified), and any general-purpose 8-pin embedded control. The OTP memory suits production volumes where in-field firmware updates are not required.
When designing with this part, observe that the OTP memory requires one-time programming at production; budget for an emulator (PIC12C671 ICD or ICE) during development. The 6 I/O pins are shared with the ADC, so plan analog channel assignments carefully. The internal RC oscillator can be used or an external crystal/RC selected via configuration bits.
חלופות תחליף ישיר עבור PIC12C671-04/P — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם PIC12C671-04/P (אותו גורם צורה וטביעת רגל) — שונים ב Package, Operating Temperature, Timers, Program Memory Size, RoHS Status.
PIC12C672-04/P
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC12C672-10/P
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC12CE674-04/P
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC12F675-I/P
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC12F683-I/P
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC12C508A-04/P
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC12C509A-04/P
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PIC12C671-04/P דירוגים מרביים ומאפיינים חשמליים
| Architecture | PIC 8-bit RISC |
| Core | 8-bit PIC |
| תדר שעון מקסימלי | 4 MHz |
| Program Memory Size | 1.75 KB (1024 x 14) OTP |
| RAM Size | 128 bytes |
| EEPROM | Not present (CE674/675 variants only) |
| I/O Pins | 6 |
| ADC | 4 channels x 8-bit |
| מתח אספקה | 3.0 V to 5.5 V |
| Instruction Set Size | 35 single-word instructions |
| Timers | 1 x 8-bit with 8-bit prescaler |
| Watchdog Timer | Yes, with dedicated on-chip RC oscillator |
| מארז | 8-Pin PDIP (P) |
| טמפרטורת פעולה | -40C to +85C (commercial/industrial) |
| I/O Sink/Source Current | 25 mA per pin |
| סוג הרכבה | Through-Hole |
| סטטוס RoHS | Compliant |
תצורת פינים של PIC12C671-04/P
| פין 1 | GP5/OSC1/CLKIN — General-purpose I/O pin 5 / Oscillator crystal input / External clock input |
| פין 2 | GP4/OSC2/CLKOUT — General-purpose I/O pin 4 / Oscillator crystal output / Clock output (Fosc/4) |
| פין 3 | GP3/MCLR/VPP — General-purpose I/O pin 3 / Master Clear (reset, active low) / Programming voltage input |
| פין 4 | GP2/AN2/TOCKI/INT — General-purpose I/O pin 2 / ADC channel 2 / Timer0 clock input / External interrupt |
| פין 5 | GP1/AN1/VREF — General-purpose I/O pin 1 / ADC channel 1 / ADC voltage reference input |
| פין 6 | GP0/AN0 — General-purpose I/O pin 0 / ADC channel 0 |
| פין 7 | VDD — Positive supply voltage (3.0V to 5.5V) |
| פין 8 | VSS — Ground reference |
יישומים טיפוסיים
PIC12C671-04/P מתאים עבור 6 יישוםs: Low-Cost Sensor Reading with ADC, Appliance Control State Machine, Battery-Operated Timer / Blinker, Automotive Interior Accessories (Non-Qualified), Replacement of Discrete Logic 555/Logic Gates, Educational and Hobbyist Embedded Projects.
Low-Cost Sensor Reading with ADC
The PIC12C671-04/P suits low-cost sensor front-ends where a handful of analog channels need to be digitized and processed locally. Its 4-channel 8-bit ADC provides 256 quantization levels over the 0-Vdd range, sufficient for thermistor voltage dividers, LDR photocells, or simple pressure sensor bridges. The 4MHz clock (1us instruction cycle) lets a single channel conversion complete in approximately 20us. Six I/O pins drive LEDs for status indication. The 3V-5.5V supply range aligns with two-AA alkaline battery stacks or a 5V regulated rail. Total BOM is the MCU plus a decoupling cap and the analog front-end.
מומלץ
Appliance Control State Machine
Small household appliances (coffee makers, fan controllers, water heaters) often need a simple state machine that reads a few buttons and drives a relay or TRIAC. The PIC12C671-04/P fits this role with its 1.75KB OTP program memory, 25mA source/sink I/O, and on-chip watchdog timer. The watchdog prevents firmware lockup that could leave a heater element on. The 8-pin PDIP package simplifies through-hole assembly for low-volume products. OTP cost is justified when the firmware is finalized and production volumes are high enough that per-unit cost dominates the BOM.
מומלץ
Battery-Operated Timer / Blinker
The 3.0V minimum supply and low-power design of PIC12C671-04/P suit battery-operated timer circuits, blinking LED markers, and replacement for 555-based pulse generators. With the internal RC oscillator and code-driven timing, an LED can be blinked at low frequency for months on a coin cell or AA pack. The watchdog timer with dedicated RC oscillator can wake the MCU from sleep at intervals without an external crystal. The 6 I/O pins allow multi-channel LED driving or low-side N-MOSFET switching.
מומלץ
Automotive Interior Accessories (Non-Qualified)
PIC12C671-04/P is widely used in non-safety automotive interior accessories where AEC-Q100 qualification is not required: dome-light delay modules, simple turn-signal reminders, seat-position memory switches, and HVAC trim controls. Its 8-bit ADC reads potentiometers for trim position, the 25mA I/O sinks standard automotive indicator bulbs, and the 3-5.5V supply works from the 12V battery after a 7805 regulator. For safety-critical or under-hood automotive use, designers must choose AEC-Q100-qualified PIC16F equivalents instead.
מומלץ
Replacement of Discrete Logic 555/Logic Gates
Designers frequently migrate legacy 555-timer and discrete-logic circuits to a PIC12C671-04/P for fewer parts and configurable timing. A single PIC replaces a 555 plus support components with software-defined period and duty cycle. The OTP memory holds the timing constants, 6 I/O pins handle multiple independent channels, and the 1us instruction cycle supports timing resolutions below 1ms. The result is one part on the BOM instead of several 555s, reducing assembly cost and increasing reliability.
מומלץ
Educational and Hobbyist Embedded Projects
The PIC12C671-04/P is a popular choice in educational kits and hobbyist projects because of its simple 8-pin PDIP package (easy breadboarding), Microchip's free MPLAB X IDE, and the extensive PIC instruction-set literature. With only 35 instructions and 1.75KB of code space, beginners can complete small projects (LED chasers, digital dice, basic voltmeters) within a single lab session. The 4MHz internal RC oscillator eliminates the need for external crystals, and PICkit programmers target this part for quick in-circuit programming.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור PIC12C671-04/P — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | PIC12C672-04/P | PIC12F675-I/P | PIC12F683-I/P | PIC12C508A-04/P | PIC12C509A-04/P |
|---|---|---|---|---|---|---|
| Package | PDIP-8 | PDIP-8 (same) | PDIP-8 (same) | PDIP-8 (same) | PDIP-8 (same) | PDIP-8 (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 1.75 KB OTP | 3.5 KB OTP (+100%) | 1.75 KB Flash | 2 KB Flash | 0.75 KB OTP | 1.5 KB OTP |
| RAM | 128 B | 128 B | 64 B | 128 B | 25 B | 41 B |
| Max Clock | 4 MHz | 4 MHz | 20 MHz | 20 MHz | 4 MHz | 4 MHz |
| ADC | 4 ch x 8-bit | 4 ch x 8-bit | 4 ch x 10-bit | 4 ch x 10-bit | None | None |
| Memory Type | OTP | OTP | Flash | Flash | OTP | OTP |
| EEPROM | None | None | 64 B | 256 B | None | None |
| Approx Unit Price (qty 100) | $1.73 | $1.73 (same tier) | $1.85 (Flash premium) | $2.10 (Flash + PWM) | $1.45 (smaller memory) | $1.55 |
מבדילים עיקריים
- On-chip 8-bit ADC with no external ADC required (לעומתPIC12C508A-04/P / PIC12C509A-04/P)
- Flash-based upgrade path with same pinout (לעומתPIC12F675-I/P)
- OTP-only architecture for ultra-low unit cost (לעומתPIC12F675-I/P)
הערות תכנון
PIC12C671-04/P uses one-time-programmable (OTP) program memory, which means each unit can only be programmed once. During development, design with the Flash-based PIC12F675-I/P (same 8-pin PDIP pinout) and migrate to PIC12C671-04/P only when firmware is finalized for production. Programming a code error into OTP memory bricks the device, wasting both the IC and the manufacturing slot.
Place a 0.1uF ceramic decoupling capacitor as close as physically possible to pins 7 (VDD) and 8 (VSS). Keep traces short (under 5mm). The ADC inputs are sensitive to supply noise; if ADC accuracy matters in your design, add a small RC filter (10 ohm + 100nF) between VDD and the PIC's VDD pin to attenuate switching noise from the same board.
Pin 3 is shared between GP3 (digital I/O), MCLR (reset), and VPP (programming voltage). If MCLR is enabled in configuration bits, pin 3 cannot be used as a general-purpose input without glitches on reset. To free pin 3 for digital I/O, disable MCLR in the configuration word, but understand that you lose the external hardware reset path. Use the internal Power-On Reset (POR) as compensation.
When using an external crystal (XT or HS oscillator modes), route the OSC1 and OSC2 traces symmetrically with short, parallel lengths and surround them with a ground pour to minimize stray capacitance. Keep the crystal within 5mm of the IC pins. If using the internal RC oscillator, leave the OSC1/OSC2 pins available as GP5/GP4 by selecting the INTRC configuration mode in the configuration word.
מידע על תאימות
PIC12C671-04/P is RoHS-compliant (lead-free PDIP package). Not AEC-Q100 qualified; for AEC-Q100 automotive designs, choose PIC16F or PIC18F equivalent parts instead.
