PIC16LC621AT-04E/SO - 8-Bit 4MHz OTP MCU, 1.75KB, 18-SOIC | Microchip
MPN: PIC16LC621AT-04E/SO ✗ Cuối đờiPIC16LC621AT-04E/SO Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (ROM/EPROM/Flash), data memory (RAM), and peripheral interfaces such as timers, I/O ports, and communication modules. Within the semiconductor hierarchy, an MCU is a sub-class of embedded processor -> microprocessor -> digital IC. The PIC16LC621A specifically belongs to Microchip's mid-range PIC16 family, characterized by a 14-bit instruction set, two-level hardware stack, and Harvard-style separate program/data buses.
Key features of the PIC16LC621AT-04E/SO include 13 I/O pins, seven or eight special function hardware registers, and direct, indirect, and relative addressing modes. It is rated for the automotive operating temperature range (per the 'E' designator) and uses One-Time Programmable (OTP) EPROM for code storage, making it suitable for low-to-medium volume production. The device supports Watchdog Timer, power-on reset, and sleep low-power modes typical of the PIC mid-range architecture.
Technically, the PIC16LC621A employs a RISC instruction set with most instructions executing in a single instruction cycle (4 oscillator clocks). Its CMOS process yields low power consumption, and the 'LC' variant specifies a low-voltage (2.5 V minimum) operation, ideal for battery-backed or 3.3 V-only systems. The 18-SOIC package offers an industry-standard footprint compatible with hand-soldering and automated SMT assembly.
Typical applications include automotive body controllers, low-end sensor interfaces, appliance controls, and industrial logic replacement. The OTP memory is well-suited to mature, stable firmware where field re-programmability is not required.
A key design consideration is that the 'A' suffix denotes an enhanced silicon revision; engineers should confirm register-level compatibility with older PIC16C621 firmware. OTP parts cannot be reprogrammed, so emulator or flash-based PIC16F621 prototypes are recommended during development.
This page synthesizes distributor stock data, parametric alternatives, and practical design notes not aggregated in a single place on the manufacturer datasheet, enabling faster engineering and procurement decisions.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC621AT-04E/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 PIC16LC621AT-04E/SO (cùng hình factor và footprint) — khác nhau ở Operating Temperature Range, Program Memory Size, Program Memory Type, RoHS Status, Core Architecture.
PIC16LC621A-04E/SO
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PIC16LC621AT-04E/SO Tỷ lệ tối đa & tính chất điện
| Core Processor | PIC |
| Core Size | 8-bit |
| Core Series | PIC 16C |
| Clock Speed (Max) | 4 MHz |
| Program Memory Size | 1.75 KB (1K x 14) |
| Program Memory Type | OTP EPROM |
| RAM Size | 96 x 8 bytes |
| Number of I/O Pins | 13 |
| Supply Voltage Range | 2.5 V to 6.25 V |
| Instruction Word Width | 14-bit |
| Data Path Width | 8-bit |
| Khoảng nhiệt độ hoạt động | Automotive (E suffix) |
| Hộp / Vỏ | 18-SOIC (0.300 inch, plastic) |
| Kiểu lắp đặt | Surface Mount |
Cấu hình chân PIC16LC621AT-04E/SO
| Chân 1 | MCLR/VPP — Master clear reset (active low) / programming voltage input |
| Chân 2 | RA0 — PORTA bit 0 (digital I/O) |
| Chân 3 | RA1 — PORTA bit 1 (digital I/O) |
| Chân 4 | RA2 — PORTA bit 2 (digital I/O) |
| Chân 5 | RA3 — PORTA bit 3 (digital I/O) |
| Chân 6 | RA4 — PORTA bit 4 (digital I/O, open-drain option) |
| Chân 7 | VSS — Ground reference |
| Chân 8 | OSC1 — Oscillator input / external clock input |
| Chân 9 | OSC2 — Oscillator output (crystal mode) |
| Chân 10 | RB0 — PORTB bit 0 (digital I/O, interrupt-on-change) |
| Chân 11 | RB1 — PORTB bit 1 (digital I/O, interrupt-on-change) |
| Chân 12 | RB2 — PORTB bit 2 (digital I/O, interrupt-on-change) |
| Chân 13 | RB3 — PORTB bit 3 (digital I/O, interrupt-on-change) |
| Chân 14 | RB4 — PORTB bit 4 (digital I/O, interrupt-on-change) |
| Chân 15 | RB5 — PORTB bit 5 (digital I/O, interrupt-on-change) |
| Chân 16 | RB6 — PORTB bit 6 (digital I/O, interrupt-on-change, ICSP clock) |
| Chân 17 | RB7 — PORTB bit 7 (digital I/O, interrupt-on-change, ICSP data) |
| Chân 18 | VDD — Positive supply voltage (2.5V to 6.25V) |
Ứng dụng tiêu biểu
PIC16LC621AT-04E/SO phù hợp cho 6 Áp dụngs: Automotive Body Control Modules, Low-End Sensor Interface Modules, Appliance Control Boards, Industrial Logic Replacement (Glue Logic MCU), Battery-Backed Remote Controls, Legacy Industrial Timing Modules.
Automotive Body Control Modules
The PIC16LC621AT-04E/SO's automotive-grade 'E' temperature suffix and 2.5-6.25V supply range make it a fit for body controllers managing lighting, wipers, and accessory timing. Its 4 MHz instruction rate handles debounced switch scanning, relay PWM, and LIN-style bit-banging protocols common in pre-CAN body networks. The 13 I/O pins and 96-byte RAM are sufficient for typical body-controller firmware that handles a handful of inputs and a few actuator outputs without an RTOS.
Được đề xuất
Low-End Sensor Interface Modules
With 96 bytes RAM, 13 I/O, and a 4 MHz core, the PIC16LC621AT-04E/SO fits sensor-interface modules such as thermistor conditioning, simple level switches, and 4-20 mA loop readouts. The OTP memory is appropriate for fixed calibration constants in production. Its low 2.5 V minimum supply allows direct battery operation in remote sensor nodes, and the small 18-SOIC footprint suits compact sensor housings where board area is constrained.
Được đề xuất
Appliance Control Boards
The PIC16LC621AT-04E/SO is well-suited to white-goods appliance controllers like coffee makers, microwave keypads, and small kitchen devices where cost is critical and firmware is fixed at production time. The 1.75 KB OTP holds typical state-machine firmware for button matrices, LED indicators, and triac-triggered heating elements. Its 18-SOIC package is compatible with high-volume SMT lines used in consumer appliance manufacturing.
Được đề xuất
Industrial Logic Replacement (Glue Logic MCU)
Designers often replace discrete 74HC logic with a PIC16LC621AT-04E/SO when pin count exceeds discrete gates and a small amount of programmability adds value. With 13 I/O and 4 MHz execution, the MCU can decode complex input combinations, generate timed pulse trains, and handle asynchronous events more compactly than discrete logic. The 96-byte RAM and 14-bit instructions accommodate typical state-machine or lookup-table implementations.
Được đề xuất
Battery-Backed Remote Controls
The PIC16LC621AT-04E/SO's 2.5 V minimum supply and CMOS low-power design fit battery-powered handheld transmitters for garage doors, security fobs, and simple RF remote controls. Sleep current is low enough to support multi-year coin-cell operation. The 4 MHz oscillator and 1.75 KB program memory can store rolling-code algorithms and button-debounce routines typical of sub-GHz ISM-band transmitters.
Được đề xuất
Legacy Industrial Timing Modules
The PIC16LC621AT-04E/SO is commonly found in long-lifecycle industrial timing, sequencing, and watchdog-redundant control modules where the design is stable and OTP suffices. With 4 MHz clock and 96-byte RAM, it can implement delay-line replacements, watchdog-kicker logic, and sequence-interlock functions. The automotive 'E' temp grade supports harsh factory environments, and the 18-SOIC footprint eases integration into legacy PCB layouts.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC621AT-04E/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-04E/SO | PIC16LC621A-04/SO | PIC16LC621AT-04/SO |
|---|---|---|---|---|
| Package | 18-SOIC | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core Processor | PIC (8-bit) | PIC (8-bit) | PIC (8-bit) | PIC (8-bit) |
| Clock Speed (Max) | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP |
| RAM Size | 96 bytes | 96 bytes | 96 bytes | 96 bytes |
| Operating Temperature | Automotive (E suffix) | Automotive (E suffix) | Commercial | Commercial |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete |
Bảo phân biệt quan trọng
- Automotive-grade temperature range (vsPIC16LC621A-04/SO)
- Tape-and-reel packaging for SMT automation (vsPIC16LC621A-04E/SO (without T suffix))
- Low-voltage 2.5 V operation (vsStandard PIC16C621 (3.0 V minimum))
Ghi chú thiết kế
PIC16LC621AT-04E/SO is OTP (One-Time Programmable) and cannot be erased or rewritten once programmed. Develop and debug firmware on a flash-based PIC16F621 or PIC16F628A prototype, then port the final hex image to OTP parts for production. Failing to use a flash development platform can cost hundreds of dollars in scrapped OTP samples during firmware iteration.
Place a 0.1 uF ceramic decoupling capacitor as close as possible to the VDD pin (pin 18), with a short trace to VSS (pin 7). For designs with large switching loads, add a 10 uF bulk capacitor near the MCU. The PIC16LC621A's internal POR (Power-On Reset) handles slow VDD rise, but rapid transients on VDD can cause unintended resets if decoupling is inadequate. Keep digital and analog ground returns separated when integrating with op-amps or sensors.
Route the MCLR/VPP pin through a 10 kohm pull-up to VDD and a 100 nF capacitor to VSS for proper reset behavior; do not leave MCLR floating. If using ICSP, do not place series resistance greater than 100 ohm on RB6/RB7 (ICSP clock/data), or programming may fail. Keep oscillator traces short and surround them with a ground guard ring to minimize EMI pickup on the OSC1/OSC2 traces.
Thông tin tuân thủ
RoHS and lead-free status not explicitly stated in verified distributor data. The 'E' temperature suffix indicates automotive operating range but does not by itself imply AEC-Q100 qualification. Engineers requiring explicit RoHS-compliant parts should select the active PIC16F621-I/SO or PIC16F628A-I/SO, which carry current Microchip RoHS declarations.
