PIC16C55A-04I/P - 4MHz 8-Bit OTP MCU, 768B, 28-PDIP | Microchip
MPN: PIC16C55A-04I/P ✓ Hoạt độngPIC16C55A-04I/P Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral I/O on one die. In the component taxonomy, an MCU belongs to the broader class of microcontrollers -> embedded processors -> digital ICs -> semiconductors. The PIC16C5x family pioneered Microchip's RISC architecture for low-cost, high-volume embedded control, and it is the direct ancestor of today's PIC16 and PIC18 families.
Key features of the PIC16C55A-04I/P include 33 single-word single-cycle RISC instructions providing 2:1 code compression over CISC 8-bit MCUs of its era, a two-level deep hardware stack, an 8-bit real-time counter (TMR0) with an 8-bit programmable prescaler, direct/indirect/relative addressing, and seven or eight special function hardware registers. The OTP program memory allows one-time factory or field programming, making the part well suited to mature production runs where firmware is fixed.
Architecturally, the device uses a Harvard-style separated program/data bus, 12-bit instruction width, and CMOS process technology for low power. It runs from a single 3.0V to 6.25V supply (commercial/industrial variants) at up to 4 MHz, producing 1 MIPS throughput. The 8-bit data path with 12-bit opcodes yields compact code density that fits easily within the 512-word OTP space.
Typical applications include appliance controls, low-end consumer products, simple sensor interfaces, battery chargers, LED drivers, and industrial timers where a small, inexpensive, deterministic 8-bit core is preferred over a 16-/32-bit MCU. The industrial temperature grade extends deployment into factory and outdoor equipment.
When designing with this part, choose an external 4 MHz crystal or resonator for clock accuracy, drive MCLR with a proper reset circuit, and reserve RA0-RA3 digital I/O pins carefully because some packages multiplex analog functions onto them. The OTP memory cannot be erased, so use a PIC16F55 flash equivalent for prototyping.
Bộ thay thế dễ dàng lắp đặt cho PIC16C55A-04I/P — 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 PIC16C55A-04I/P (cùng hình factor và footprint) — khác nhau ở Program Memory Size, Package, Timers, Watchdog Timer, Core.
PIC16C55A-04/P
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Xem tài liệu →PIC16C55-10I/P
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Xem tài liệu →PIC16C55A-04I/SO
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| Core | PIC16C5x 8-bit RISC |
| Bề rộng đường dữ liệu | 8-bit |
| Instruction Width | 12-bit |
| Max Clock Frequency | 4 MHz |
| Program Memory Size | 768 B (512 x 12 OTP) |
| Program Memory Type | OTP (One-Time Programmable) |
| RAM Size | 24 B |
| Number of I/O Pins | 20 |
| Timers | 1 x 8-bit (TMR0) with prescaler |
| Stack Depth | 2 levels (hardware) |
| Supply Voltage (Vdd) | 3.0 V to 6.25 V |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp / Vỏ | 28-DIP (0.600 in / 15.24 mm) |
| Kiểu lắp đặt | Through-Hole |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC16C55A-04I/P
| Chân 1 | RA2 — Bidirectional I/O port A bit 2 |
| Chân 2 | RA3 — Bidirectional I/O port A bit 3 |
| Chân 3 | RA4/T0CKI — Bidirectional I/O port A bit 4 / TMR0 clock input |
| Chân 4 | MCLR/Vpp — Master Clear reset input / programming voltage |
| Chân 5 | Vss — Ground reference |
| Chân 6 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| Chân 7 | OSC2/CLKOUT — Crystal oscillator output / clock output |
| Chân 8 | RB0 — Bidirectional I/O port B bit 0 |
| 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 | RB6 — Bidirectional I/O port B bit 6 |
| Chân 15 | RB7 — Bidirectional I/O port B bit 7 |
| Chân 16 | RC0 — Bidirectional I/O port C bit 0 |
| Chân 17 | RC1 — Bidirectional I/O port C bit 1 |
| Chân 18 | RC2 — Bidirectional I/O port C bit 2 |
| Chân 19 | RC3 — Bidirectional I/O port C bit 3 |
| Chân 20 | RC4 — Bidirectional I/O port C bit 4 |
| Chân 21 | RC5 — Bidirectional I/O port C bit 5 |
| Chân 22 | RC6 — Bidirectional I/O port C bit 6 |
| Chân 23 | RC7 — Bidirectional I/O port C bit 7 |
| Chân 24 | RD0 — Bidirectional I/O port D bit 0 |
| Chân 25 | RD1 — Bidirectional I/O port D bit 1 |
| Chân 26 | RD2 — Bidirectional I/O port D bit 2 |
| Chân 27 | RD3 — Bidirectional I/O port D bit 3 |
| Chân 28 | Vdd — Positive supply voltage |
Ứng dụng tiêu biểu
PIC16C55A-04I/P phù hợp cho 6 Áp dụngs: Appliance Control Board, Battery Charger Control, Industrial Timer / Sequencer, LED Lighting Controller, Simple Sensor Interface Module, Consumer Remote Control.
Appliance Control Board
The PIC16C55A-04I/P suits low-cost appliance controllers such as microwave oven keypads, washing-machine cycle timers, and coffee-maker user interfaces. Its 4 MHz RISC core delivers deterministic 1 MIPS throughput, allowing real-time control of relays, triacs, and seven-segment LED or LCD displays without an RTOS. The 768-byte OTP program memory fits typical appliance firmware (state machines, button debouncing, buzzer patterns) while keeping unit cost under $2.50. Industrial -40C to +85C temperature grade supports refrigerator and dishwasher compartments. MCLR, TMR0, and 20 I/O pins enable direct drive of matrix keypads and indicator LEDs with minimal external logic, reducing BOM cost and PCB area.
Được đề xuất
Battery Charger Control
The PIC16C55A-04I/P is well-matched to lead-acid or NiMH charger controllers in the 1A-5A range. TMR0 with programmable prescaler provides accurate charge-time and -dT/dt termination timing, while the 20 I/O pins drive MOSFET gate drivers, status LEDs, and temperature-sensor inputs. The 3.0V-6.25V supply range allows direct connection to a 6V or 12V battery rail through a small linear regulator. OTP program memory locks the charging algorithm at production time, preventing field firmware drift in safety-critical applications. Low power consumption and the industrial temperature range support unattended battery-backed installations and outdoor solar charger enclosures.
Được đề xuất
Industrial Timer / Sequencer
Factory-floor timer and sequencer modules benefit from the PIC16C55A-04I/P's deterministic 8-bit core and rugged PDIP package. The device can scan 4x4 matrix keypads, drive 7-segment displays via discrete transistors, and sequence up to eight relay outputs through optical isolation. The -40C to +85C industrial temperature grade handles unheated cabinets and outdoor enclosures. OTP memory is ideal for fixed-cycle production equipment where firmware is finalized and never updated. PIC16C5x instruction-set compatibility means hundreds of legacy timer/sequencer designs can be re-implemented without retraining.
Được đề xuất
LED Lighting Controller
Decorative and architectural LED controllers use the PIC16C55A-04I/P to generate PWM dimming, chase patterns, and color-mixing sequences across RGB LED strings. The 8-bit TMR0 with prescaler creates accurate PWM frequencies above 100 Hz to avoid visible flicker, and 20 I/O pins multiplex dozens of LED channels through constant-current drivers like the WS2801 or TLC5940. OTP memory locks lighting patterns at production - perfect for fixed-scene installations in retail, signage, and stage lighting. Low cost and industrial temperature range suit 24/7 commercial installations.
Được đề xuất
Simple Sensor Interface Module
Sensor-interface modules for HVAC, environmental monitoring, and industrial gauges use the PIC16C55A-04I/P to read analog signals via external ADC, apply linearization or thresholding, and drive 4-20 mA or RS-232 outputs. The small 24-byte RAM and 768-byte OTP are sufficient for lookup-table calibration of thermistor, RTD, or load-cell signals. Wide supply range (3.0-6.25V) supports both 3.3V and 5V sensor buses, and the industrial temperature grade covers outdoor installations. OTP prevents accidental field modification that could shift calibrated outputs.
Được đề xuất
Consumer Remote Control
Universal remote controls, garage-door openers, and toy controllers use the PIC16C55A-04I/P for low-cost IR or RF transmission with matrix-scanned keypads. TMR0 generates accurate carrier frequencies (38 kHz IR, 315/433 MHz RF) and protocol bit-timings, while the 20 I/O pins directly drive keypad rows/columns and transmitter-enable lines. OTP memory locks the protocol decoder at production, preventing user modification. The 4 MHz clock is sufficient for all common IR (RC5, NEC, SIRC) and simple RF encoders without jitter issues, and the PDIP package simplifies hand-soldering during small-batch production.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C55A-04I/P — 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 | PIC16C55A-04/P | PIC16C55A-04E/P | PIC16C55-10I/P |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-PDIP | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 10 MHz |
| Program Memory | 768 B OTP | 768 B OTP | 768 B OTP | 768 B OTP |
| RAM | 24 B | 24 B | 24 B | 24 B |
| Operating Temperature | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +125C (Extended) | -40C to +85C (Industrial) |
| Instruction Set | 33 RISC instructions, 12-bit wide | 33 RISC instructions, 12-bit wide | 33 RISC instructions, 12-bit wide | 33 RISC instructions, 12-bit wide |
| Number of I/O Pins | 20 | 20 | 20 | 20 |
Bảo phân biệt quan trọng
- Industrial temperature grade for harsh environments (vsPIC16C55A-04/P)
- Maximum community familiarity and tooling support (vsPIC16C54A-04I/P)
- Cost-optimized OTP for high-volume mature products (vsPIC16F55-I/P)
Ghi chú thiết kế
The PIC16C55A-04I/P uses OTP (One-Time Programmable) memory that cannot be erased. Always prototype with a flash-based equivalent such as PIC16F57 or PIC16F59, then port the validated HEX file to the OTP part for production. Per Microchip datasheet DS30400D, blank OTP devices read as 0xFFF, so unprogrammed code space will execute NOP-equivalent instructions - always fill unused program memory with NOPs or jump-to-reset patterns to ensure safe recovery from any code path glitch.
Estimated: At Vdd = 5.0 V and a 4 MHz oscillator, the PIC16C55A-04I/P draws approximately 2 mA active and <1 uA in sleep mode. Provide a 100 nF decoupling capacitor within 5 mm of Vdd (pin 28) and a 10 uF bulk capacitor near the IC for noisy industrial environments. The MCLR/Vpp pin (pin 4) requires a 10 kohm pull-up to Vdd and a 100 nF capacitor to ground for proper reset - omitting this is the most common boot failure source on PIC16C5x designs.
Route the 4 MHz crystal traces (OSC1 pin 6, OSC2 pin 7) symmetrically and keep them short (<10 mm) and away from switching nodes. Add a grounded guard ring around the crystal to reduce EMI pickup. The 28-PDIP through-hole footprint allows easy hand-soldering and rework, but for high-vibration industrial environments consider the SOIC-28 (PIC16C55A-04I/SO) or SSOP-28 (PIC16C55A-04I/SS) surface-mount alternatives for better mechanical reliability.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page. Lead-free (Pb-free) PDIP package. Industrial temperature grade -40C to +85C. Not AEC-Q100 qualified; for automotive applications consult Microchip's PIC16F automotive family.
