PIC16LC56AT-04I/SO - 4MHz 8-bit OTP MCU, 1.5KB, 18-SOIC | Microchip
MPN: PIC16LC56AT-04I/SO ✓ Hoạt độngPIC16LC56AT-04I/SO Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a CPU core, non-volatile program memory, working RAM, and peripheral I/O. The PIC16C5X architecture pioneered Harvard memory organization with separate program and data buses, 12-bit-wide instructions, and a two-stage pipeline that executes most instructions in one cycle. The 'LC' prefix indicates the low-voltage CMOS variant, allowing operation down to 2.5 V for battery-powered designs, while the 'A' suffix denotes an enhanced baseline device with a 4 MHz oscillator and improved interrupt structure versus the original PIC16C56. The OTP variant is programmed once at production, making it suited to fixed-function appliances and cost-sensitive embedded controllers.
Key features include 12 CMOS bidirectional I/O ports capable of directly driving LEDs, an 8-bit timer/counter (TMR0) with a programmable prescaler, a watchdog timer for reliable unattended operation, power-on reset, brown-out detection, and a 4 MHz internal/external oscillator option. The device draws microamp-level sleep current, supports in-circuit serial programming, and operates over the industrial -40 °C to +85 °C temperature range.
Typical applications include low-cost consumer appliances, remote-control transmitters, LED lighting controllers, battery chargers, smart sensors, and simple IoT edge nodes. Its wide voltage tolerance also makes it useful in 3 V coin-cell systems as well as legacy 5 V industrial logic. Compared with PIC16F parts, the OTP-based PIC16LC56AT provides the lowest unit cost for high-volume production where code does not need to be updated.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC56AT-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 PIC16LC56AT-04I/SO (cùng hình factor và footprint) — khác nhau ở Timers, MSL Level, Operating Temperature Range, Package, Watchdog Timer.
PIC16LC56AT-04/SO
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Xem tài liệu →PIC16C56A-04I/SO
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Xem tài liệu →PIC16C56A-04E/SO
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PIC16LC56AT-04I/SO Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16C5X 8-bit Harvard RISC |
| Instruction Set Width | 12-bit |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 1.5 KB (1K x 12) |
| RAM | 25 x 8 bytes |
| Data EEPROM | Not present |
| Maximum Clock Speed | 4 MHz |
| Supply Voltage Range | 2.5 V to 5.5 V |
| I/O Pins | 12 |
| Timers | 1 x 8-bit (TMR0) with prescaler |
| Watchdog Timer | Yes (on-chip WDT) |
| Brown-Out Reset | Yes |
| Power-On Reset | Yes |
| Interrupt Sources | External, TMR0 overflow, PORTB change |
| Khoảng nhiệt độ hoạt động | -40 °C to +85 °C (Industrial) |
| Hộp | 18-pin SOIC (SO) |
| Kiểu lắp đặt | Surface Mount |
Cấu hình chân PIC16LC56AT-04I/SO
| Chân 1 | RA2 — Bidirectional I/O, Port A bit 2 |
| Chân 2 | RA3 — Bidirectional I/O, Port A bit 3 |
| Chân 3 | RA0 — Bidirectional I/O, Port A bit 0 |
| Chân 4 | RA1 — Bidirectional I/O, Port A bit 1 |
| Chân 5 | GND — Ground reference |
| Chân 6 | OSC1 — Oscillator input or external clock in |
| Chân 7 | OSC2 — Oscillator output (crystal/RC mode) |
| Chân 8 | RB0 — Bidirectional I/O, Port B bit 0, interrupt |
| Chân 9 | RB1 — Bidirectional I/O, Port B bit 1 |
| Chân 10 | RB2 — Bidirectional I/O, Port B bit 2 |
| Chân 11 | RB3 — Bidirectional I/O, Port B bit 3 |
| Chân 12 | RB4 — Bidirectional I/O, Port B bit 4 |
| Chân 13 | RB5 — Bidirectional I/O, Port B bit 5 |
| Chân 14 | VDD — Positive supply 2.5 V to 5.5 V |
| Chân 15 | RA4/T0CKI — I/O Port A bit 4 / Timer 0 clock input |
| Chân 16 | MCLR/VPP — Master clear reset / programming voltage input |
| Chân 17 | RA5 — Bidirectional I/O, Port A bit 5 |
| Chân 18 | RB7 — Bidirectional I/O, Port B bit 7 |
Ứng dụng tiêu biểu
PIC16LC56AT-04I/SO phù hợp cho 6 Áp dụngs: Remote Control Transmitter, Consumer Appliance Controller, LED Lighting Controller, Battery Charger Monitor, Smart Sensor Edge Node, Toy and Hobby Electronics.
Remote Control Transmitter
The PIC16LC56AT-04I/SO is widely used in low-cost infrared and RF remote-control transmitters for TVs, set-top boxes, fans, and toys. Its 12 CMOS I/O pins can directly drive an IR LED through a current-limiting resistor while the 8-bit TMR0 generates precise carrier frequencies (typically 36-56 kHz) for protocol encoding. The 2.5 V operation permits two AAA cells without a boost converter, and OTP memory guarantees one-time programming that prevents cloning. The 4 MHz instruction rate and 12-bit instructions easily fit Manchester or RC5/RC6 protocol encoders in under 500 instructions, leaving headroom for multi-button matrices.
Được đề xuất
Consumer Appliance Controller
White-goods appliances (toasters, coffee machines, washing machine front panels) use the PIC16LC56AT-04I/SO as the main state-machine controller. The 1.5 KB OTP holds the entire wash/cooking program, and the 12 I/O pins multiplex 7-segment displays, keypad matrices, and triac-driving optocouplers. Brown-out reset and the on-chip watchdog timer survive brown-out and EMI events common in motor-driven appliances. Industrial -40 to +85 °C temperature range covers under-hood automotive and outdoor equipment variants.
Được đề xuất
LED Lighting Controller
Dimmer and color-mixing LED controllers use the PIC16LC56AT-04I/SO because its 12-bit PWM via TMR0 overflow-and-compare trick can produce 256-step dimming on 4 channels simultaneously. The 2.5 V minimum allows direct Li-Ion battery operation in portable lamps, and the 5.5 V maximum tolerates USB-powered 5 V rails. Low sleep current extends battery life in motion-activated closet or stairway lighting.
Được đề xuất
Battery Charger Monitor
NiMH and Li-Ion chargers use the PIC16LC56AT-04I/SO as a charge-state monitor and termination detector. Its wide 2.5-5.5 V range operates from a single Li-Ion cell or four AA cells, and the watchdog timer resets the device if the main loop hangs during charging. The 12 I/O ports can drive 4 LED status indicators, read a thermistor for temperature-qualified charging, and control a relay or MOSFET for charge path switching. OTP memory locks in the safety algorithm.
Được đề xuất
Smart Sensor Edge Node
Low-duty-cycle sensor edge nodes (water-leak detectors, magnetic reed switches, simple PIR alarms) leverage the PIC16LC56AT-04I/SO's microamp sleep current and 2.5 V operation to run for years on a coin cell. The 12 I/O pins read multiple switches or simple analog levels via RC discharge timing, and the 4 MHz clock lets the MCU wake, sample, decide, and return to sleep in under 1 ms. Industrial temperature rating supports outdoor deployments.
Được đề xuất
Toy and Hobby Electronics
Mass-market electronic toys, plush sound modules, and hobby train controllers use the PIC16LC56AT-04I/SO as the cheapest possible controller with enough I/O for motors, LEDs, and a speaker-driver transistor. OTP memory keeps per-unit cost below $1 at high volume, while the 4 MHz instruction rate delivers multi-channel PWM for hobby-grade servo control. Surface-mount 18-SOIC supports modern reflow-compatible toy assembly lines.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC56AT-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 | PIC16LC56AT-04/SO | PIC16C56A-04I/SO | PIC16C56A-04E/SO |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC | 18-SOIC (same) | 18-SOIC (same) | 18-SOIC (same) |
| Program Memory | 1.5 KB OTP | 1.5 KB OTP | 1.5 KB OTP | 1.5 KB OTP |
| RAM | 25 bytes | 25 bytes | 25 bytes | 25 bytes |
| Maximum Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 3.0 V to 6.25 V | 3.0 V to 6.25 V |
| Operating Temperature | -40 to +85 °C (Industrial) | 0 to +70 °C (Commercial) | -40 to +85 °C (Industrial) | -40 to +125 °C (Extended) |
| I/O Pins | 12 | 12 | 12 | 12 |
| Watchdog Timer | Yes | Yes | Yes | Yes |
Bảo phân biệt quan trọng
- Low-voltage 2.5 V operation vs standard PIC16C5X family (vsPIC16C56A-04I/SO)
- Industrial temperature range as standard (vsPIC16LC56AT-04/SO)
- Watchdog timer and brown-out reset integrated (vsGeneric 8-bit MCUs without supervisory circuits)
Ghi chú thiết kế
The PIC16LC56AT-04I/SO operates from 2.5 V to 5.5 V; add a 100 nF decoupling capacitor within 5 mm of the VDD pin (pin 14) and a 10 µF bulk capacitor at the board supply input. Brown-out reset triggers at approximately 2.0 V - ensure your power supply ramp-up time is below 50 ms to avoid repeated POR cycles. For battery-powered designs, place a 100 kohm/100 kohm resistive divider on VDD to enable ADC-less supply monitoring via digital I/O thresholds.
For a 4 MHz design, select the HS oscillator mode and use a ceramic resonator with built-in capacitors (typical CSTCR4M00G15L) or a crystal plus two 15-33 pF load capacitors. RC oscillator mode is acceptable for cost-sensitive applications but introduces ±20% frequency tolerance across temperature; do not use RC for timing-sensitive protocols such as UART bit-banging. Always keep oscillator traces short and surround them with a ground guard ring to minimize EMI coupling.
Do not assume OTP parts can be reprogrammed - the PIC16LC56AT can only be written once. Always prototype with a flash equivalent (e.g., PIC16F54) and migrate to OTP only after firmware is locked. The MCLR/VPP pin (pin 16) requires a 10 kohm pull-up to VDD to prevent spurious resets; tying it directly to VDD may cause programming issues. PORTB internal weak pull-ups are disabled by default - enable them in software via the OPTION register for switch-matrix inputs.
The 18-SOIC footprint has 0.05" (1.27 mm) pitch - route power and ground on a 4-layer stackup with a dedicated ground plane beneath the MCU. Place the decoupling capacitor within 5 mm of VDD and route the GND pin (pin 5) directly to the ground plane via a short trace or via-in-pad. Exposed copper under the SOIC body improves thermal dissipation for high-duty-cycle PWM designs but is not strictly required given the low internal power dissipation of the PIC16C5X core (typically <50 mW).
Thông tin tuân thủ
Compliance information not explicitly stated in the verified web data; the PIC16LC56AT-04I/SO is a legacy OTP part manufactured for industrial and consumer use. AEC-Q100 qualification is not applicable to this baseline MCU.