PIC16LC621A-04E/SS - 8-bit OTP MCU, 4MHz, 1.75KB EPROM | Microchip
MPN: PIC16LC621A-04E/SS ✓ Hoạt độngPIC16LC621A-04E/SS Tóm tắt
What is an 8-bit OTP microcontroller? An 8-bit OTP MCU is a small, low-power RISC microcontroller that integrates CPU, non-volatile OTP program memory, RAM data memory, and digital peripherals on a single CMOS die. Within the broader hierarchy (8-bit microcontroller -> RISC microcontroller -> microcontroller -> embedded IC -> semiconductor), the PIC16LC62x sits at the lower end of Microchip's mid-range PIC16 architecture, designed for cost-sensitive, low-pin-count embedded control tasks where the firmware is finalized during development and not field-upgradable.
Key features of the PIC16LC621A-04E/SS include a 14-bit instruction word with only 35 single-cycle instructions to learn (excluding program branches, which take two cycles), a two-level deep hardware stack, direct/indirect/relative addressing modes, seven or eight special-function hardware registers, and an integrated watchdog timer, power-on reset, and brown-out reset. The "LC" voltage class supports 2.5 V to 6.25 V operation, allowing both 3.3 V and 5 V rails, while the "04" suffix denotes the 4 MHz speed grade. The "E" suffix designates the extended industrial temperature range (-40 °C to +125 °C).
The device architecture uses a Harvard-style separate program/data bus optimized for deterministic 200 ns instruction cycles, with a small but efficient interrupt structure. Twelve to thirteen GPIO pins share package pins with peripheral functions, and the on-chip RC oscillator option reduces external component count. Total I/O count and peripheral map vary slightly within the PIC16LC62x sub-family, but the 621A variant provides 12 I/O with analog comparator support.
Typical applications include low-cost consumer appliances, sensor interface modules, simple motor and relay control, LED driving and indicator panels, battery-powered handheld instruments, and industrial automation edge nodes where 8-bit processing headroom and minimal BOM are more important than connectivity or DSP performance.
When designing with this part, note that OTP memory cannot be reprogrammed in-circuit; for development cycles, use the windowed (JW) or flash-based PIC16F62x equivalent. Brown-out reset and watchdog timer configuration are controlled by configuration-word bits set during programming and cannot be changed at runtime. Always place a 0.1 µF decoupling capacitor within a few millimeters of VDD.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, organized to help procurement and embedded engineers evaluate the PIC16LC621A-04E/SS quickly.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC621A-04E/SS — 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 PIC16LC621A-04E/SS (cùng hình factor và footprint) — khác nhau ở Program Memory Type, Package, Program Memory Size, Core Architecture, Operating Temperature.
PIC16LC621A-04/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC621A-04I/SS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LC621AT-04/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC620A-04E/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC620AT-04I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC620A-04E/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC621A-04E/SS Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit PIC RISC |
| Program Memory Type | EPROM (OTP) |
| Program Memory Size | 1.75 KB |
| Data RAM | 96 bytes |
| Tần số xung maksimum | 4 MHz |
| Instruction Cycle Time | 200 ns (single-cycle instructions) |
| Instruction Word Width | 14 bits |
| Number of Instructions | 35 |
| Supply Voltage (LC class) | 2.5 V to 6.25 V |
| I/O Pins | 13 |
| Khoảng nhiệt độ hoạt động | -40 °C to +125 °C (Extended, "E") |
| Hộp | 20-pin SSOP (5.30 mm body width) |
| Kiểu lắp đặt | Surface Mount |
| Hardware Stack | 2 levels deep |
| Peripherals | Watchdog Timer, Power-On Reset, Brown-Out Reset, Analog Comparator |
Cấu hình chân PIC16LC621A-04E/SS
| Chân 1 | MCLR/VPP — Master clear reset input / programming voltage |
| Chân 2 | RA0/AN0 — Digital I/O / analog comparator input |
| Chân 3 | RA1/AN1 — Digital I/O / analog comparator input |
| Chân 4 | RA2/AN2/VREF — Digital I/O / analog comparator / voltage reference |
| Chân 5 | RA3/AN3 — Digital I/O / analog comparator input |
| Chân 6 | RA4/T0CKI — Digital I/O / Timer0 clock input (open-drain) |
| Chân 7 | RA5/SS/AN4 — Digital I/O / SPI slave select / analog comparator |
| Chân 8 | OSC2/CLKOUT — Crystal oscillator output / clock out |
| Chân 9 | OSC1/CLKIN — Crystal oscillator input / external clock |
| Chân 10 | RC0 — Digital I/O port C |
| Chân 11 | RC1 — Digital I/O port C |
| Chân 12 | RC2 — Digital I/O port C |
| Chân 13 | RC3 — Digital I/O port C |
| Chân 14 | RC4 — Digital I/O port C |
| Chân 15 | RC5 — Digital I/O port C |
| Chân 16 | RC6 — Digital I/O port C |
| Chân 17 | RC7 — Digital I/O port C |
| Chân 18 | RB0/INT — Digital I/O port B / external interrupt |
| Chân 19 | VSS — Ground reference |
| Chân 20 | VDD — Positive supply voltage (2.5V to 6.25V) |
Ứng dụng tiêu biểu
PIC16LC621A-04E/SS phù hợp cho 6 Áp dụngs: Consumer Appliance Control, Battery-Powered Sensor Module, LED Lighting Driver Controller, Industrial Automation Edge Node, Automotive Interior Switch Panel, Simple Motor Speed Controller.
Consumer Appliance Control
The PIC16LC621A-04E/SS fits consumer appliance control with its 1.75 KB OTP program memory and 200 ns single-cycle instruction execution at 4 MHz, enabling responsive keypad/display polling. Brown-out reset and watchdog timer protect against mains brown-outs and firmware lock-ups, while the 13 I/O pins drive relays, triac optocouplers, and seven-segment displays. Compared with a flash MCU, the OTP variant reduces unit cost in high-volume appliance production runs.
Được đề xuất
Battery-Powered Sensor Module
The PIC16LC621A-04E/SS suits battery-powered sensor modules thanks to its 2.5 V to 6.25 V supply range supporting 3.3 V lithium chemistry and low CMOS sleep current. The 4 MHz internal RC oscillator eliminates the external crystal, reducing quiescent draw and BOM cost for remote sensor nodes. With 96 bytes of RAM and 13 I/O, it handles periodic ADC reads from the analog comparator and basic threshold-based decision logic.
Được đề xuất
LED Lighting Driver Controller
The PIC16LC621A-04E/SS drives LED lighting controllers via PWM-on-software, using one or more of its 13 I/O pins with the 200 ns instruction cycle to generate accurate PWM dimming signals at low frequencies. The 1.75 KB OTP stores color-mixing lookup tables and fade curves for architectural lighting. Extended -40C to +125C temperature operation supports outdoor or industrial fixture environments with high ambient heat.
Được đề xuất
Industrial Automation Edge Node
In industrial automation edge nodes, the PIC16LC621A-04E/SS reads discrete sensor inputs and drives optoisolated outputs while the 4 MHz clock and 200 ns instruction cycle provide deterministic loop times for PLC-style control. Brown-out reset and watchdog timer protect against ESD-induced brown-outs on factory floors, while extended -40C to +125C operation supports unheated enclosures. The 20-pin SSOP package suits compact DIN-rail terminal form factors.
Được đề xuất
Automotive Interior Switch Panel
The PIC16LC621A-04E/SS works in non-safety automotive interior switch panels (window switches, mirror controls, seat adjusters) where its -40C to +125C extended temperature rating handles cabin thermal extremes. The 13 I/O pins scan matrix keypads and drive LED backlights via PWM, while 1.75 KB EPROM holds debounce logic and indicator patterns. Note that AEC-Q100 qualification is not documented in the verified data, so it should not be used in safety-critical automotive ECUs.
Được đề xuất
Simple Motor Speed Controller
The PIC16LC621A-04E/SS implements closed-loop DC motor speed control by measuring tachometer pulses on a digital input and generating PWM on a GPIO, using the 200 ns instruction cycle to compute PI control loops in software. The 1.75 KB EPROM stores calibration constants and ramp profiles, while 13 I/O handle direction, brake, and enable signals. Extended temperature operation supports motor-driver PCB thermal rise in enclosed appliances.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC621A-04E/SS — 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/SS | PIC16LC621A-04I/SS | PIC16LC621AT-04/SS | PIC16LC620A-04E/SS | PIC16LC620AT-04I/SS | PIC16LC620A-04E/SO |
|---|---|---|---|---|---|---|---|
| Package | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 1.75 KB EPROM | 1.75 KB EPROM | 1.75 KB EPROM | 1.75 KB EPROM | 512 B EPROM | 512 B EPROM | 512 B EPROM |
| RAM | 96 bytes | 96 bytes | 96 bytes | 96 bytes | 68 bytes | 68 bytes | 68 bytes |
| Max Clock | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Operating Temperature | -40C to +125C (E) | 0C to +70C | -40C to +85C | 0C to +70C | -40C to +125C | -40C to +85C | -40C to +125C |
| Supply Voltage | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 13 | 13 |
Bảo phân biệt quan trọng
- Extended industrial temperature range (vsPIC16LC621A-04/SS)
- 1.75 KB EPROM for more complex firmware (vsPIC16LC620A-04E/SS)
- 96 bytes RAM for larger buffers (vsPIC16LC620A-04E/SS)
Ghi chú thiết kế
Place a 0.1 µF ceramic decoupling capacitor within 3 mm of the VDD pin (pin 20) and an additional 10 µF bulk capacitor at the regulator output. The PIC16LC621A-04E/SS operates from 2.5 V to 6.25 V; for 5 V rails use a low-dropout regulator such as MCP1700 with at least 100 mV headroom above the regulated output to avoid dropout during motor inrush events.
The PIC16LC621A-04E/SS uses OTP EPROM and cannot be re-flashed after programming; the SSOP package has no UV-erase window. For development cycles, program a flash-based PIC16F62x or PIC16F628 equivalent first, then qualify the OTP variant for production. Configuration-word bits for watchdog, brown-out, and oscillator mode are set once during programming and cannot be changed at runtime.
Route the MCLR/VPP pin (pin 1) directly to a dedicated reset pull-up resistor (typically 10 kΩ to VDD) and avoid long traces that pick up noise; capacitive loading above 50 pF on MCLR can prevent reliable in-circuit serial programming. Keep the crystal traces between OSC1 (pin 9) and OSC2 (pin 8) short and symmetric, with a ground guard ring if operating above 4 MHz in noisy environments.
Thông tin tuân thủ
RoHS, REACH, lead-free, and halogen-free status not explicitly stated in verified web data; flagged as [DATA_NEEDED]. AEC-Q100 not documented for this part - select PIC16F or PIC18F automotive-grade MCUs for safety-critical automotive ECUs. Microchip publishes a Conflict Minerals Report compliant with the Dodd-Frank Act covering the PIC16 family.
