PIC16LC621-04/SO - 4MHz 8-Bit CMOS MCU, 1.75KB OTP, 18-SOIC | Microchip
MPN: PIC16LC621-04/SO ✓ Hoạt độngPIC16LC621-04/SO Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path that fetches, decodes, and executes instructions from on-chip program memory; it sits within the broader hierarchy of microcontroller -> embedded controller -> semiconductor IC -> integrated circuit. The 'LC' prefix in PIC16LC621 indicates a low-power CMOS variant of the PIC16C621 OTP family, optimized for battery and energy-constrained embedded designs while retaining the PIC mid-range instruction set.
Key features of the PIC16LC621-04/SO include 12-bit-wide instruction words, an 8-bit-wide data path, seven or eight special-function hardware registers, a two-level deep hardware stack, and direct, indirect, and relative addressing modes. The device supports internal and external oscillator options typical of the PIC16C62x family, watchdog timer with on-chip RC oscillator, power-on reset, power-saving SLEEP mode, and selectable oscillator start-up timer.
The architecture uses a Harvard-style RISC design with only 35 single-word instructions, enabling predictable real-time response. The EPROM-based program memory supports one-time-programmable field updates and in-circuit programming via Microchip development tools, while the 80-byte RAM and 13 I/O pins are sufficient for small-signal sensing, switch scanning, and motor or relay driving applications.
Typical applications include consumer appliance control, low-end remote controls, sensor signal conditioning, timer/counter-based industrial control, automotive interior modules (sub-systems), and battery-powered portable devices where low quiescent current and the 18-pin SOIC footprint are advantageous. The wide 2.5V-6.0V supply range also enables 3.3V and 5V system designs.
When designing with the PIC16LC621-04/SO, note that OTP memory is one-time programmable - firmware revisions require new parts. For field-upgradeable designs consider PIC16F62x flash variants. Always reserve the MCLR/VPP pin for in-circuit serial programming and decoupling the VDD/VSS pair with 100 nF ceramic capacitors placed within 5 mm of the package pins.
This page synthesizes distributor pricing for 18-SOIC commercial PIC16LC62x variants, drop-in same-package alternatives from the PIC16LC620A/621A family, and practical design notes not collected in a single place in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC621-04/SO — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC16LC621-04/SO (cùng hình factor và footprint) — khác nhau ở Program Memory Size, Package, Program Memory Type, Core Architecture, Operating Temperature Range.
PIC16LC621A-04/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC620A-04/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC620A-04I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC620A-04E/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC620-04I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC621-04/SO Tỷ lệ tối đa & tính chất điện
| Product Family | PIC16C62x (Mid-Range 8-bit MCU) |
| Core Architecture | 8-bit RISC, Harvard |
| Clock Speed (Max) | 4 MHz |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 1.75 KB (1K x 14 words) |
| RAM Size | 80 bytes |
| Data EEPROM | Not present |
| I/O Pins | 13 |
| Supply Voltage Range | 2.5 V to 6.0 V |
| Khoảng nhiệt độ hoạt động | 0 C to +70 C (Commercial) |
| Instruction Width | 12-bit / 14-bit |
| Hardware Stack | 2-level |
| Hộp | 18-SOIC (SO-18, 0.300 inch, 7.50 mm body) |
| Kiểu lắp đặt | Surface Mount |
Cấu hình chân PIC16LC621-04/SO
| Chân 1 | MCLR/VPP — Master Clear (reset) input / Programming voltage input |
| Chân 2 | RA0/AN0 — PORTA bit 0 / Analog comparator input |
| Chân 3 | RA1/AN1 — PORTA bit 1 / Analog comparator input |
| Chân 4 | RA2/AN2 — PORTA bit 2 / Analog comparator reference |
| Chân 5 | RA3/AN3 — PORTA bit 3 / Analog comparator output |
| Chân 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 7 | RA5 — PORTA bit 5 |
| Chân 8 | VSS — Ground reference |
| Chân 9 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| Chân 10 | OSC2/CLKOUT — Oscillator crystal output / clock out (Fosc/4) |
| Chân 11 | RC0 — PORTC bit 0 |
| Chân 12 | RC1 — PORTC bit 1 |
| Chân 13 | RC2 — PORTC bit 2 |
| Chân 14 | RC3 — PORTC bit 3 |
| Chân 15 | RC4 — PORTC bit 4 |
| Chân 16 | RC5 — PORTC bit 5 |
| Chân 17 | RC6 — PORTC bit 6 |
| Chân 18 | RC7 — PORTC bit 7 |
Ứng dụng tiêu biểu
PIC16LC621-04/SO phù hợp cho 7 Áp dụngs: Consumer Appliance Control, Low-End Remote Control and IR Encoder, Battery-Powered Sensor Signal Conditioning, Industrial Timer and Counter Module, Automotive Interior Sub-Systems, Educational and Hobbyist Embedded Projects, White Goods User Interface Controllers.
Consumer Appliance Control
The PIC16LC621-04/SO fits consumer appliance control because its 4 MHz RISC core executes 35 instructions at predictable 1 us per instruction cycle, enabling accurate timing for relay drivers, triac controls, and user-interface button debouncing. The 1.75 KB OTP (1K x 14) holds mid-complexity state-machine firmware for washing-machine cycles, microwave oven timers, or air-conditioner thermostats. The 13 I/O pins multiplex directly to LED indicators, seven-segment displays, keypad matrices, and zero-cross detect inputs without external glue logic, and the 2.5 V-6.0 V supply range lets designers run from rectified mains-derived rails. Industrial-grade temperature variants (PIC16LC620A-04I/SO) extend the same design to kitchen and HVAC environments.
Được đề xuất
Low-End Remote Control and IR Encoder
The PIC16LC621-04/SO's 80-byte RAM, 4 MHz clock, and 13 I/O are sufficient for IR remote-control encoders using RC-5, NEC, or SIRC protocols. The internal watchdog and SLEEP-mode quiescent current (~1 uA typical for LC family) make it ideal for battery-powered handsets where the device wakes only on button interrupt, transmits a codeword, and returns to sleep. The 2.5 V minimum supply enables two-AAA-cell operation (3 V nominal) without boost converters. Its OTP memory locks the transmission protocol at production, preventing firmware tampering and enabling low-cost cloning-resistant remotes for set-top boxes and consumer A/V gear.
Được đề xuất
Battery-Powered Sensor Signal Conditioning
For battery-powered sensor signal conditioning, the PIC16LC621-04/SO offers the LC family's low-power CMOS core, integrated analog comparator, and 13 I/O to read thermistor, photodiode, or hall-effect sensors. The PIC16LC62x analog comparator eliminates an external op-amp in threshold-detection designs. With SLEEP current under 5 uA and active current under 2 mA at 4 MHz / 3 V, the device can run for years on a CR2032 cell when duty-cycled. The OTP memory locks calibrated coefficients, and the 18-SOIC package supports compact PCB layouts in wearables and IoT sensor beacons where space is critical.
Được đề xuất
Industrial Timer and Counter Module
The PIC16LC621-04/SO is well suited to industrial timer/counter modules because its 8-bit Timer0 and Timer1 (typical of PIC16C62x family) with selectable prescalers can measure pulse widths up to 0.25 s at 4 MHz and generate precise event sequencing. The on-chip watchdog timer with dedicated RC oscillator prevents lockup in unattended control panels, conveyor controllers, or motor-protection relays. The 13 I/O drive LEDs, keypad switches, optocouplers, and SSR triggers directly. Industrial-temp and extended-temp variants (PIC16LC620A-04I/SO, PIC16LC620A-04E/SO) operate across -40 C to +125 C for factory-floor and outdoor enclosures.
Được đề xuất
Automotive Interior Sub-Systems
In automotive interior sub-systems (mirror controls, seat-position memory, interior lighting, climate-mode switches), the PIC16LC621-04/SO provides a cost-optimized OTP controller with 4 MHz timing resolution for debounced switch inputs and PWM LED dimming. The 13 I/O handle CAN/LIN bus wake-up logic via interrupt, seat-motor H-bridge enable signals, and multi-color LED drivers. For under-dash applications the industrial-temp PIC16LC620A-04I/SO covers the -40 C to +85 C automotive interior range. AEC-Q100 qualification is not available on the C62x family; safety-critical ECUs require PIC16F or dsPIC parts instead.
Được đề xuất
Educational and Hobbyist Embedded Projects
The PIC16LC621-04/SO is a popular entry-level MCU for educational and hobbyist embedded projects because its 35-instruction RISC core, 18-SOIC breadboard-friendly footprint, and Microchip's MPLAB X IDE with free MPASM/XC8 toolchain give students a low-cost, well-documented platform. The 1.75 KB OTP can be erased by UV (windowed CERDIP variant) for repeated development cycles, while production runs use the plastic OTP SO-18. The 13 I/O are sufficient for blinking LEDs, driving seven-segment displays, scanning 4x4 keypads, and interfacing HC-SR04 ultrasonic sensors or DHT11 humidity sensors, all at a part cost under $2 in volume.
Được đề xuất
White Goods User Interface Controllers
The PIC16LC621-04/SO suits white-goods user-interface controllers (washing-machine, dishwasher, refrigerator panel) where the 1.75 KB OTP holds the state machine for wash cycles, buzzer patterns, and LCD-segment multiplexed displays. The 13 I/O directly drive common-anode LED digit segments and read capacitive-touch electrodes with the integrated analog comparator. The 2.5 V-6.0 V supply accepts rectified 5 V or 12 V rails after regulation. Designers pair this MCU with a high-voltage I/O expander (e.g., ULN2003) for relay switching. The extended-temperature PIC16LC620A-04E/SO supports laundry-room and garage installations where ambient temperatures swing to 60 C.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC621-04/SO — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC16LC621A-04/SO | PIC16LC620A-04/SO | PIC16LC620A-04I/SO | PIC16LC620A-04E/SO |
|---|---|---|---|---|---|
| Package | 18-SOIC (0.300 inch) | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP | 0.875 KB OTP | 0.875 KB OTP | 0.875 KB OTP |
| RAM | 80 bytes | 80 bytes | 80 bytes | 80 bytes | 80 bytes |
| I/O Pins | 13 | 13 | 13 | 13 | 13 |
| Max Clock | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C | -40 C to +125 C |
| Supply Voltage | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to +6.0 V | 2.5 V to +6.0 V |
| Silicon Revision | Original (pre-A) | A revision (improved) | A revision (improved) | A revision (improved) | A revision (improved) |
Bảo phân biệt quan trọng
- Low-power CMOS LC process extends battery life (vsPIC16C621-04/SO (non-LC variant))
- OTP memory locks firmware against tampering (vsPIC16F628A-I/SO (flash-based))
- Silicon A revision available for new designs (vsPIC16LC621A-04/SO (silicon A refresh))
Ghi chú thiết kế
Decouple VDD (pin 12) and VSS (pin 8) with a 100 nF X7R ceramic capacitor placed within 5 mm of the package pins. For noisy industrial environments add a bulk 10 uF tantalum or aluminum polymer capacitor on the same rail. The PIC16LC62x family is rated 2.5 V to 6.0 V; operating below 2.5 V risks POR (power-on-reset) misbehavior and EEPROM write failure. Always hold MCLR high through a 10 kohm pull-up to VDD; do not leave MCLR floating because noise spikes can trigger spurious resets.
Route the OSC1/OSC2 crystal traces as short, symmetric pairs and place the load capacitors (typically 15-33 pF for HS mode, 10-22 pF for XT) within 5 mm of the oscillator pins to minimize stray capacitance. Avoid routing digital switching signals (PWM, relay drive) under or adjacent to OSC1/2 to prevent clock jitter and unintended phase noise. Place the MCLR/VPP trace away from high-current switching nodes to prevent in-circuit programming failures.
OTP memory is one-time-programmable; firmware bugs after programming require new parts - no field upgrade path. Plan for a windowed CERDIP package (PIC16C621-04/JW) for prototype development cycles. The PIC16LC621's 80-byte RAM is shared with the stack; deep subroutines will collide - keep call depth to two or fewer levels. Do not enable the watchdog timer (WDTE configuration bit) without enabling the prescaler or the device will reset unexpectedly within ~18 ms.
When using the on-chip analog comparator for sensor threshold detection, disable digital outputs on the comparator-input pins (RA0-RA3) by clearing the TRISA bits and avoid reading the same pins immediately after a comparator change - allow 1 us settling time. For noisy motor-control environments add a 1 kohm-10 kohm RC low-pass filter (1 nF) on the comparator input to suppress switching-noise false triggers.
Thông tin tuân thủ
RoHS / REACH / lead-free status not stated explicitly in the verified web data for PIC16LC621-04/SO; marked 'unknown' rather than assumed. PIC16C62x family is not AEC-Q100 qualified - for automotive safety-critical ECUs choose PIC16F or dsPIC AEC-Q100 parts. Conflict-minerals compliance is not declared in the data.
