PIC16LC54AT-04I/SO - 4MHz 8-Bit OTP MCU, 768B | Microchip
MPN: PIC16LC54AT-04I/SO ✓ Hoạt độngPIC16LC54AT-04I/SO Tóm tắt
What is an OTP microcontroller? An OTP (One-Time Programmable) microcontroller is a class of MCU whose program memory is implemented as user-programmable non-volatile memory (EPROM/UV-EPROM based) that can be written only once after manufacture using a device programmer. Once programmed, the code becomes permanent; unlike Flash microcontrollers, the program memory cannot be erased or rewritten in-circuit. OTPs occupy a hypernym hierarchy of: microcontroller -> embedded MCU -> CMOS digital IC. They are widely used in high-volume cost-sensitive products where firmware is final, such as appliance controllers, sensor nodes, and disposable consumer devices.
Key features of the PIC16LC54AT-04I/SO include a two-level deep hardware call stack, 12-bit wide instructions with 8-bit data path, direct/indirect/relative addressing modes, a single 8-bit timer/counter (TMR0), and seven special function hardware registers. The PIC16C5X core delivers roughly twice the code density of competing 8-bit MCUs thanks to its highly orthogonal 12-bit instruction set, which reduces overall program memory consumption by approximately 2:1 versus 8-bit instruction-set MCUs of the same era.
Architecturally, the PIC16LC54A uses a Harvard architecture with separate program and data buses, fully static CMOS design for low quiescent current, and a watchdog timer option on the wider PIC16C5X family. The "A" suffix denotes the improved silicon revision that fixes early silicon errata of the original PIC16C54 and adds the high-end OTP variants. The 18-SOIC (300-mil) package offers a familiar through-hole-compatible footprint for legacy designs.
Typical applications include low-cost consumer appliances, simple LED controllers, remote key fobs, basic sensor signal conditioning, educational development platforms, and industrial timer/counter modules where the OTP memory suffices and Flash is unnecessary. The 3 V to 6.25 V supply range and 4 MHz clock are sufficient for slow control loops and human-interface polling tasks.
When designing with this MCU, plan program memory carefully: the 768-byte (512 x 12) OTP must hold your entire firmware. Use MPLAB X IDE with MPASMX assembler or XC8 compiler (legacy support) for code development. For new designs, consider migrating to the Flash-based PIC16F54 drop-in equivalent which retains the same pinout and instruction set while adding in-circuit reprogrammability.
This page synthesizes distributor stock, parametric alternatives, and design migration paths not found in the manufacturer datasheet, including Flash drop-in replacements and same-package PIC16C5X family variants.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC54AT-04I/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 PIC16LC54AT-04I/SO (cùng hình factor và footprint) — khác nhau ở Package, Instruction Set, Watchdog Timer, Core, I/O Pins.
PIC16LC54A-04I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C54A-04I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C54C-04I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F54-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16CR54A-04I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LC54AT-04I/SO Tỷ lệ tối đa & tính chất điện
| Architecture | PIC16C5X 8-bit Harvard |
| Core | PIC16C5X (RISC) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 768 bytes (512 x 12 bits) |
| RAM Size | 25 x 8 bytes |
| Data EEPROM | Not present |
| Maximum Clock Speed | 4 MHz |
| Instruction Width | 12 bits |
| Supply Voltage (Vdd) | 3.0 V to 6.25 V |
| I/O Pins | 12 |
| Timers | 1 x 8-bit (TMR0) |
| Hardware Stack | 2 levels deep |
| Watchdog Timer | Present (family feature) |
| ADC | None |
| Nhiệt độ hoạt động | -40C to +85C (Industrial grade) |
| Hộp | 18-pin SOIC (300 mil, SO) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 (unlimited floor life) |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân PIC16LC54AT-04I/SO
| Chân 1 | /MCLR — Master Clear (reset, active low) |
| Chân 2 | RA0 — Port A bit 0 (digital I/O) |
| Chân 3 | RA1 — Port A bit 1 (digital I/O) |
| Chân 4 | RA2 — Port A bit 2 (digital I/O) |
| Chân 5 | RA3 — Port A bit 3 (digital I/O) |
| Chân 6 | RB0 — Port B bit 0 (digital I/O) |
| Chân 7 | RB1 — Port B bit 1 (digital I/O) |
| Chân 8 | Vss — Ground reference |
| Chân 9 | OSC1 — Oscillator input / external clock |
| Chân 10 | OSC2 — Oscillator output (crystal mode) |
| Chân 11 | RB2 — Port B bit 2 (digital I/O) |
| Chân 12 | RB3 — Port B bit 3 (digital I/O) |
| Chân 13 | RB4 — Port B bit 4 (digital I/O) |
| Chân 14 | Vdd — Positive supply (3.0-6.25 V) |
| Chân 15 | RB5 — Port B bit 5 (digital I/O) |
| Chân 16 | RB6 — Port B bit 6 (digital I/O) |
| Chân 17 | RB7 — Port B bit 7 (digital I/O) |
| Chân 18 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC16LC54AT-04I/SO phù hợp cho 6 Áp dụngs: Low-Cost Consumer Appliance Controller, Remote Key Fob and RF Encoder, Industrial Timer / Counter Module, Educational Microcontroller Trainer, LED Lighting Sequencer / Chaser, Simple Sensor Signal Conditioning Front-End.
Low-Cost Consumer Appliance Controller
The PIC16LC54AT-04I/SO fits low-cost consumer appliances such as toasters, coffee makers, and rice cookers because its 768-byte OTP program memory is sufficient for fixed-function control firmware, and the 3.0-6.25 V supply range allows direct connection to rectified 5 V or 3.3 V rails without additional regulators. With 12 I/O pins the MCU can directly drive relays, read keypad matrix inputs, and multiplex 7-segment or LED displays via the RB port. The 4 MHz instruction rate yields a 1 us instruction cycle, which is fast enough for polled button debounce and slow PWM-like control loops without needing interrupt overhead.
Được đề xuất
Remote Key Fob and RF Encoder
The PIC16LC54AT-04I/SO is well-suited for simple RF remote-control key fobs because its 25-byte RAM and 768-byte OTP are adequate for storing fixed transmission codes and basic button debounce logic. The PIC16C5X core's predictable 1 us instruction cycle at 4 MHz allows tight timing control of encoder pulse widths without crystal precision drift, and the 3 V low-voltage operation matches coin-cell battery packs directly. Its 12 I/O pins comfortably interface 2-4 buttons plus an ASK/OOK transmitter module such as the MICRF102.
Được đề xuất
Industrial Timer / Counter Module
Industrial timer modules benefit from the PIC16LC54AT-04I/SO's industrial -40C to +85C operating range, 4 MHz clock for second-to-hour timing, and the single 8-bit TMR0 that can be prescaled for long interval counting. The OTP memory is ideal for fixed time-range products where firmware is locked once deployed. The 18-SOIC package fits compact DIN-rail-mounted timer enclosures, and the 3-6.25 V supply accommodates 5 V industrial rails without additional regulation.
Được đề xuất
Educational Microcontroller Trainer
Hobbyist and educational microcontroller trainer boards use the PIC16LC54AT-04I/SO to teach fundamental 8-bit embedded programming because of its simple PIC16C5X instruction set, small 768-byte program memory that forces students to write efficient code, and 12 accessible I/O pins for breadboard experimentation. The 3-6.25 V supply range means it runs from a 9 V battery with a simple 7805 regulator. Its low cost (under USD 3 at qty 1) makes it attractive for inclusion in starter kits, and MPLAB X IDE with the XC8 compiler fully supports it.
Được đề xuất
LED Lighting Sequencer / Chaser
Decorative LED chasers and sequencer modules pair well with the PIC16LC54AT-04I/SO because the 12 I/O pins can directly drive up to 12 individual LEDs (with current-limiting resistors) or multiplex a larger array in a charlieplex/charlie-LED configuration. The 768-byte OTP holds multiple chase-pattern look-up tables, and the 4 MHz clock delivers smooth visual transitions. The 3-6.25 V supply lets the chip run directly from a 5 V USB or battery pack, and the OTP memory prevents accidental code corruption during power glitches.
Được đề xuất
Simple Sensor Signal Conditioning Front-End
Simple sensor-conditioning front-ends for thermostats, soil-moisture probes, and basic level sensors use the PIC16LC54AT-04I/SO to digitize slow-changing analog signals via a comparator-based slope ADC, then drive indicator LEDs or relay outputs. The single 8-bit TMR0 with prescaler provides the time base for ratiometric measurements, and the OTP memory locks the calibration constants at production. The 3-6.25 V supply supports both 3.3 V sensor modules and 5 V industrial signal chains.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC54AT-04I/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 | PIC16LC54A-04I/SO | PIC16C54A-04I/SO | PIC16C54C-04I/SO | PIC16F54-I/SO | PIC16CR54A-04I/SO |
|---|---|---|---|---|---|---|
| Package | 18-SOIC (300 mil) | 18-SOIC (300 mil) - same | 18-SOIC (300 mil) - same | 18-SOIC (300 mil) - same | 18-SOIC (300 mil) - same | 18-SOIC (300 mil) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 768 B OTP EPROM | 768 B OTP EPROM | 768 B OTP EPROM | 768 B OTP EPROM | 768 B Flash | 768 B Mask ROM |
| Max Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz (Flash) | 4 MHz |
| Supply Voltage | 3.0 V to 6.25 V | 3.0 V to 6.25 V | 4.0 V to 6.25 V | 3.0 V to 6.25 V | 2.0 V to 5.5 V | 3.0 V to 6.25 V |
| In-Circuit Reprogrammable | No (OTP) | No (OTP) | No (OTP) | No (OTP) | Yes (Flash, ICSP) | No (Mask ROM) |
| I/O Pins | 12 | 12 | 12 | 12 | 12 | 12 |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Bảo phân biệt quan trọng
- OTP EPROM retains firmware permanently even after power loss (vsPIC16F54-I/SO)
- Lower 3.0 V minimum supply enables 3.3 V direct operation (vsPIC16C54A-04I/SO)
- 12-bit RISC instruction set delivers ~2:1 code density vs competitors (vsPIC16F54-I/SO (also 12-bit))
Ghi chú thiết kế
Estimated: PIC16LC54AT-04I/SO quiescent current is typically 1-2 mA at 5 V and 4 MHz, but the device has no power-down or sleep mode because the PIC16C5X base architecture predates the SLP/IDLE instructions of later PIC families. For battery-powered designs, you must gate Vdd externally with a load switch and use the /MCLR pin to wake up. Add a 100 nF decoupling capacitor close to Vdd (pin 14) and a 10 uF bulk capacitor on the supply rail; the part can glitch on Vdd dips below 3.0 V which may corrupt OTP read mode operation.
Place the decoupling capacitor within 5 mm of the Vdd pin (pin 14) and the Vss pin (pin 8). Keep the oscillator traces short: connect a 4 MHz ceramic resonator with built-in capacitors (e.g., Murata CSTLS series) between OSC1 (pin 9) and OSC2 (pin 10), or use an external crystal with two 15-33 pF load capacitors. The /MCLR pin (pin 1) requires a 10 kohm pull-up to Vdd for normal operation; adding a momentary pushbutton to ground allows manual reset during development.
Critical: Once programmed, the PIC16LC54AT-04I/SO's OTP memory cannot be erased or rewritten. There is no in-circuit programming (ICSP) interface - the part must be programmed in a standalone device programmer (such as Microchip PICkit 1/2/3 in programmer-not-debugger mode, or a Universal Programmer like Dataman). Do not design firmware expecting field updates; if in-field updates are needed, migrate to the Flash-based PIC16F54-I/SO. Also note that the PIC16C5X has NO interrupt controller - all event handling must use polled loops. Programming voltage Vpp (typically 13 V on /MCLR) is required and not generated internally.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C. Not AEC-Q100 qualified for automotive applications; use PIC16F54-E/SO or PIC16F54-I/SO for AEC-Q100 needs.
