PIC16LC621AT-04/SS - 8-Bit 4MHz OTP MCU 20-SSOP | Microchip
MPN: PIC16LC621AT-04/SS ✓ Hoạt độngPIC16LC621AT-04/SS Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/OTP), working RAM, peripheral set, and I/O on one die; the PIC16LC621A belongs to the PIC16 mid-range 8-bit MCU family, which sits within the broader hierarchy: 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor. PIC mid-range cores use a 14-bit instruction word with an 8-bit data path, a two-level hardware stack, and Harvard architecture (separate program and data buses). The LC suffix designates the low-voltage CMOS variant optimized for 2.5V to 6.0V operation.
Key features include 12 I/O pins, two analog comparators, one 8-bit timer (Timer0), a Watchdog Timer (WDT) for code-lock recovery, and an internal RC oscillator option. The OTP memory is programmed once using Microchip's ICSP (In-Circuit Serial Programming) interface and is retained for the life of the device. The part is offered in tape-and-reel packaging as the /SS SSOP-20 form factor.
The PIC16LC621A uses a RISC-style core with only 35 single-word/single-cycle instructions (most are 1-cycle except branches), enabling predictable deterministic execution at 4 MHz (250 ns instruction cycle). Seven or eight Special Function Registers (SFRs) manage core state, and the device supports direct, indirect, and relative addressing modes. Two comparators can be software-routed to I/O pins for analog threshold detection.
Typical applications include low-power embedded control, automotive body modules (with the extended-temperature -I/SS variant), industrial sensor interfaces, simple motor and relay drivers, and battery-operated consumer appliances. The LC voltage range also makes it suitable for 3.3V systems where a true 5V-only PIC would be inappropriate.
Designers should note that the 'T' suffix indicates tape-and-reel packaging, '04' is the 4 MHz speed grade, and the LC family requires a regulated 2.5V-6.0V supply. OTP parts cannot be reprogrammed; choose the PIC16F621A Flash equivalent if in-field firmware updates are required.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC621AT-04/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 PIC16LC621AT-04/SS (cùng hình factor và footprint) — khác nhau ở Core Architecture, Program Memory Type, Program Memory Size, Package, Timers.
PIC16LC621A-04/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC621AT-04I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC621AT-04E/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC621A-04E/SO
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F621-I/SS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LC621AT-04/SS Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit RISC (mid-range) |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 1.75 KB (1K x 14 words) |
| Data RAM | 96 bytes |
| Maximum Clock Speed | 4 MHz |
| Supply Voltage Range | 2.5 V to 6.0 V |
| I/O Pins | 12 |
| Timers | 1 x 8-bit (Timer0) |
| Analog Comparators | 2 |
| Watchdog Timer | Yes (WDT) |
| Instruction Set | 35 instructions, 14-bit wide |
| Hardware Stack | 2 levels |
| Hộp | 20-SSOP (5.30 mm body width) |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
Cấu hình chân PIC16LC621AT-04/SS
| Chân 1 | RA2 — I/O port A bit 2 |
| Chân 2 | RA3 — I/O port A bit 3 |
| Chân 3 | RA4/T0CKI — I/O port A bit 4 / Timer0 clock input |
| Chân 4 | MCLR#/VPP — Master Clear (reset) input / programming voltage |
| Chân 5 | VSS — Ground reference |
| Chân 6 | RB0/INT — I/O port B bit 0 / external interrupt |
| Chân 7 | RB1 — I/O port B bit 1 |
| Chân 8 | RB2 — I/O port B bit 2 |
| Chân 9 | RB3 — I/O port B bit 3 |
| Chân 10 | RB4 — I/O port B bit 4 |
| Chân 11 | RB5 — I/O port B bit 5 |
| Chân 12 | RB6/ICCK — I/O port B bit 6 / ICSP clock |
| Chân 13 | RB7/ICDT — I/O port B bit 7 / ICSP data |
| Chân 14 | VDD — Positive supply voltage (2.5V-6.0V) |
| Chân 15 | OSC2/CLKOUT — Oscillator output / clock out |
| Chân 16 | OSC1/CLKIN — Oscillator input / external clock |
| Chân 17 | RA0/AN0 — I/O port A bit 0 / analog comparator input |
| Chân 18 | RA1/AN1 — I/O port A bit 1 / analog comparator input |
| Chân 19 | RA5 — I/O port A bit 5 (input only) |
| Chân 20 | RA6 — I/O port A bit 6 (input only) |
Ứng dụng tiêu biểu
PIC16LC621AT-04/SS phù hợp cho 6 Áp dụngs: Low-Power Embedded Control, Automotive Body Electronics, Industrial Sensor Interfaces, Battery-Operated Consumer Appliances, Simple Motor and Relay Drivers, User Interface Keyscan and LED Multiplexing.
Low-Power Embedded Control
The PIC16LC621AT-04/SS fits low-power embedded control applications because its LC voltage range (2.5V to 6.0V) and CMOS core draw less than 2 mA active at 4 MHz with the WDT enabled. Placed on a 3.3V rail from a small LDO, the part can idle in sleep mode with WDT for years on a coin cell. Unlike higher-pin-count PICs, its 20-SSOP form factor fits compact sensor-hub PCBs. Engineers should budget for the 2-level hardware stack, which limits interrupt nesting - prefer linear state machines over deep call chains.
Được đề xuất
Automotive Body Electronics
The PIC16LC621AT-04/SS is widely used in automotive body modules such as seat controllers, mirror positioners, and lighting drivers because the LC core tolerates the noisy 12V-rail environment with proper input filtering. The 20-SSOP package handles underhood thermal loads when paired with the -E extended-temperature grade variant (PIC16LC621AT-04E/SS, same package, -40C to +125C). Compared to a 5V-only PIC, the 2.5V minimum allows direct battery-rail regulation. AEC-Q100 qualification requires the automotive-grade part number - verify with OEM EMC standards.
Được đề xuất
Industrial Sensor Interfaces
For industrial sensor interfaces (temperature, level, pressure switches), the PIC16LC621AT-04/SS provides two on-chip analog comparators that can threshold-detect sensor outputs without external op-amps, reducing BOM cost. The 4 MHz clock gives 1-microsecond resolution for pulse-counting flow meters. The 20-SSOP package with 12 I/O pins supports up to 12 sensor channels or switch inputs. Compared to PLD-based logic, the PIC16LC621A offers reprogrammable timing logic via OTP firmware, simplifying SKU proliferation across product variants.
Được đề xuất
Battery-Operated Consumer Appliances
The PIC16LC621AT-04/SS is a fit for battery-operated consumer appliances (electric toothbrushes, kitchen timers, remote controls) because the LC variant draws under 1 mA active at 3V with WDT enabled, extending battery life by 30-50% versus a 5V-only PIC. The 20-SSOP package occupies less than 30 mm² of PCB area, leaving room for coin-cell holders. The 2-level hardware stack and 96-byte RAM constrain firmware complexity - favor state-machine designs over RTOS-style code. Compared to ASICs, the OTP PIC offers sub-$2 BOM at low volumes.
Được đề xuất
Simple Motor and Relay Drivers
The PIC16LC621AT-04/SS drives small DC motors, solenoids, and relays via its 12 I/O pins sourcing up to 25 mA per pin (with proper port-current balancing). The 4 MHz clock generates accurate PWM via software bit-banging, eliminating external timer ICs. The 20-SSOP package mounts directly on the back of relay boards, cutting wiring harness cost. The on-chip comparators sense motor current through a shunt resistor for stall detection. Compared to a 555-timer + logic-gate solution, the LC621A consolidates timing, sensing, and drive into one $2 part.
Được đề xuất
User Interface Keyscan and LED Multiplexing
The PIC16LC621AT-04/SS handles 4x4 keyscan matrices and multiplexed LED displays because its 12 I/O pins can be software-split into an 8-output / 4-input matrix without external diodes, leveraging internal weak pull-ups on PORTB. At 4 MHz, scan rates exceed 100 Hz, eliminating visible LED flicker. The 20-SSOP package leaves board space for the switch footprint itself. Compared to dedicated keyboard controllers, the LC621A allows custom debounce logic and lighting patterns in firmware, with no NRE cost for low-volume SKUs.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC621AT-04/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 | PIC16LC621AT-04I/SS | PIC16LC621AT-04E/SS | PIC16LC621A-04E/SO | PIC16F621-I/SS |
|---|---|---|---|---|---|---|
| Package | 20-SSOP | 20-SSOP (same) | 20-SSOP (same) | 20-SSOP (same) | 20-SOIC (wider body, different footprint) | 20-SSOP (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB Flash |
| Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz |
| Supply Voltage | 2.5V to 6.0V | 2.5V to 6.0V | 2.5V to 6.0V | 2.5V to 6.0V | 2.5V to 6.0V | 2.0V to 5.5V |
| Temperature Grade | Commercial (0C to +70C) | Commercial | Industrial (-40C to +85C) | Extended (-40C to +125C) | Extended (-40C to +125C) | Industrial (-40C to +85C) |
| I/O Pins | 12 | 12 | 12 | 12 | 12 | 12 |
| Comparators | 2 | 2 | 2 | 2 | 2 | 2 |
| In-Field Reprogrammable | No (OTP) | No (OTP) | No (OTP) | No (OTP) | No (OTP) | Yes (Flash, 100k erase cycles) |
Bảo phân biệt quan trọng
- Low-voltage LC variant supports 2.5V to 6.0V operation (vsPIC16F621-I/SS)
- Two on-chip analog comparators eliminate external op-amps (vsPIC16LC620A-04/SS)
- OTP program memory offers lowest unit cost at high volume (vsPIC16F621-I/SS)
- Tape-and-reel packaging for SMT assembly lines (vsPIC16LC621A-04/SS (tube))
Ghi chú thiết kế
The PIC16LC621AT-04/SS LC variant draws less than 2 mA active at 4 MHz / 5V and less than 1 mA at 3.3V, with sleep current typically below 1 microampere when the WDT is disabled. Decouple VDD (pin 14) with a 100 nF ceramic capacitor placed within 5 mm of the pin, plus a bulk 10 uF tantalum or ceramic if the supply has high switching noise. The MCLR#/VPP pin (pin 4) requires a 10 kohm pull-up to VDD for normal operation; omitting this resistor prevents code execution.
Route the ICSP pins (RB6/ICCK pin 12 and RB7/ICDT pin 13) to a 2-pin or 5-pin header so production programming can occur after PCB assembly. Keep these traces short (under 50 mm) and avoid running them parallel to switching-power traces. The 20-SSOP pin pitch is 0.65 mm, requiring 0.2 mm trace-and-space PCB fabrication; wider 0.3 mm rules work but consume more board area. Expose the SSOP thermal pad area beneath the package as a continuous ground pour to reduce EMI from internal oscillator edges.
Three common PIC16LC621A design pitfalls to avoid: (1) The 2-level hardware stack limits CALL nesting to 1 deep - writing recursive or deeply-nested C code triggers stack overflow and erratic resets; prefer linear state machines or upgrade to PIC18 for deeper stacks. (2) RA5 and RA6 are input-only on this family; configuring them as outputs via TRISA has no effect. (3) OTP memory is truly one-time - verify firmware thoroughly with the PIC16F621 Flash equivalent before committing to OTP programming, as no second-chance erase exists.
Estimated: with internal RC oscillator at 4 MHz, the rise/fall time on OSC1/OSC2 is roughly 20 ns, producing harmonic content up to 50 MHz on those traces. Route OSC1 (pin 16) and OSC2 (pin 15) as short as possible (under 10 mm) and surround with a ground guard ring to prevent coupling into adjacent analog comparator inputs on RA0/RA1. If using an external crystal, place the load capacitors (typically 15-33 pF) within 3 mm of OSC1/OSC2 to ensure reliable start-up.
Thông tin tuân thủ
Lead-free and matte-tin finish per Microchip product specifications; the OTP / SS process node typically uses lead-free terminations as of recent Microchip product revisions. RoHS and REACH compliance status not explicitly confirmed in retrieved web data and require verification against the manufacturer's signed compliance certificate. AEC-Q100 qualification is NOT applicable to the standard /SS commercial variant; choose the -I or -E variants for automotive-grade designs but verify qualification documentation with Microchip.
