PIC16C55AT-04/SO - 8-Bit 4MHz OTP MCU 768B | Microchip
MPN: PIC16C55AT-04/SO ✗ Cuối đờiPIC16C55AT-04/SO Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and I/O peripherals on a single silicon die. The PIC16C5X family uses a 12-bit-wide instruction word with a RISC (Reduced Instruction Set Computer) architecture that delivers roughly 2:1 code compression versus other 8-bit MCUs in its class, enabling simpler firmware development. Within the broader taxonomy, this part is a microcontroller (MCU) -> embedded controller -> semiconductor device, designed for cost-sensitive embedded control where deterministic instruction timing and minimal external components are priorities.
Key features of the PIC16C55AT-04/SO include a 4 MHz internal/external clock input, 33 single-word instructions, a two-level hardware stack, 20 bidirectional I/O pins organized into three ports (RA, RB, RC), and a programmable Watchdog Timer (WDT) with on-chip RC oscillator. The OTP program memory is programmed once via Microchip's standard ICSP-compatible serial programming interface. Power consumption is typically 2 mA at 5V/4 MHz, with sleep/idle current under typical CMOS standby levels.
The device is built on a baseline PIC architecture using static CMOS logic, meaning the clock can be stopped without losing internal register state - useful for power-saving designs. It supports interrupt-driven control via the global interrupt enable and individual peripheral flags, and includes a Power-on Reset (POR), power-up Timer (PWRT), and Oscillator Start-up Timer (OST) for reliable cold-start behavior without external reset circuitry.
Typical applications include appliance control, automotive body electronics (non-safety), LED display drivers, simple sensor interfaces, and remote transmitters/receivers. The wide SOIC-28 footprint is suitable for hand-soldered prototypes as well as high-volume SMT production lines.
When designing with the PIC16C55AT-04/SO, note that OTP memory cannot be erased or reprogrammed - firmware bugs require physical part replacement. Engineers targeting field updates should consider the flash-based PIC16F5X family instead. The /SO suffix indicates the SOIC-28 wide-body tape-and-reel packaging for SMT assembly.
This page synthesizes distributor pricing, drop-in alternatives, comparison data, and practical design notes not found in the manufacturer datasheet, helping engineers source and integrate this legacy OTP MCU efficiently.
Bộ thay thế dễ dàng lắp đặt cho PIC16C55AT-04/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 PIC16C55AT-04/SO (cùng hình factor và footprint) — khác nhau ở Package, Instruction Set, Program Memory Size, Program Memory Type, RAM Size.
PIC16C55AT-04I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C55A-04/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C54A-04/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F54-I/SO
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16C554T-04/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C558-04/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C55AT-04/SO Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit RISC PIC16C5X |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 768 B (512 x 12 words) |
| RAM | 24 B |
| Tần số xung maksimum | 4 MHz |
| Instruction Set | 33 single-word instructions, 12-bit opcode |
| Number of I/O Pins | 20 |
| Điện áp cung cấp | 5 V (nominal) |
| Hộp | 28-pin SOIC wide-body (7.50 mm) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | 0C to +70C (commercial) |
| Watchdog Timer | Yes (software-enabled) |
| Hardware Stack | 2 levels |
| Power-on Reset / PWRT / OST | Yes (built-in) |
| Cấp MSL | 1 (per JEDEC J-STD-020) |
Cấu hình chân PIC16C55AT-04/SO
| Chân 1 | RA2 — Bidirectional I/O, Port A bit 2 |
| Chân 2 | RA3 — Bidirectional I/O, Port A bit 3 |
| Chân 3 | T0CKI — Timer0 clock input / RA4 |
| Chân 4 | MCLR — Master Clear (reset) input, active low |
| Chân 5 | VSS — Ground reference |
| Chân 6 | OSC1/CLKIN — Oscillator input / external clock input |
| Chân 7 | OSC2/CLKOUT — Oscillator output / clock output |
| Chân 8 | RC0 — Bidirectional I/O, Port C bit 0 |
| Chân 9 | RC1 — Bidirectional I/O, Port C bit 1 |
| Chân 10 | RC2 — Bidirectional I/O, Port C bit 2 |
| Chân 11 | RC3 — Bidirectional I/O, Port C bit 3 |
| Chân 12 | RC4 — Bidirectional I/O, Port C bit 4 |
| Chân 13 | RC5 — Bidirectional I/O, Port C bit 5 |
| Chân 14 | RC6 — Bidirectional I/O, Port C bit 6 |
| Chân 15 | RC7 — Bidirectional I/O, Port C bit 7 |
| Chân 16 | RB0/INT — Bidirectional I/O, Port B bit 0 / external interrupt |
| Chân 17 | RB1 — Bidirectional I/O, Port B bit 1 |
| Chân 18 | RB2 — Bidirectional I/O, Port B bit 2 |
| Chân 19 | RB3 — Bidirectional I/O, Port B bit 3 |
| Chân 20 | RB4 — Bidirectional I/O, Port B bit 4 |
| Chân 21 | RB5 — Bidirectional I/O, Port B bit 5 |
| Chân 22 | RB6 — Bidirectional I/O, Port B bit 6 |
| Chân 23 | RB7 — Bidirectional I/O, Port B bit 7 |
| Chân 24 | VDD — Positive supply voltage (+5V) |
| Chân 25 | RA0 — Bidirectional I/O, Port A bit 0 |
| Chân 26 | RA1 — Bidirectional I/O, Port A bit 1 |
| Chân 27 | NC — Not connected (per datasheet) |
| Chân 28 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC16C55AT-04/SO phù hợp cho 6 Áp dụngs: Appliance Control Panels, LED Display Drivers, Remote Control Transmitters, Automotive Body Electronics (Non-Safety), Industrial Sensor Interfaces, Toy and Hobby Electronics.
Appliance Control Panels
The PIC16C55AT-04/SO is well suited to appliance control panels such as washing machines, microwave ovens, and small kitchen devices where 20 I/O pins are sufficient for keypad scanning, LED/LCD segment driving, and relay or triac control. Its 768B OTP program memory is enough to encode state-machine-based control firmware, and its 4 MHz execution provides adequate response time for user-interface debouncing, motor sequencing, and timer-based cycles. The SOIC-28 wide-body footprint supports both hand-prototype assembly and high-volume SMT lines typical of consumer appliance manufacturing.
Được đề xuất
LED Display Drivers
The PIC16C55AT-04/SO can directly drive multiplexed 7-segment LED displays using its 20 I/O pins, each capable of 25 mA source/sink per the Microchip datasheet. By mapping segment and digit lines to ports RA/RB/RC and time-multiplexing in firmware, the MCU can refresh 4-6 digit displays without external driver ICs, reducing BOM cost in digital clocks, counters, and simple instrumentation. The 4 MHz instruction rate easily sustains 100+ Hz multiplex refresh to avoid visible flicker.
Được đề xuất
Remote Control Transmitters
Battery-powered remote controls benefit from the PIC16C55AT-04/SO's low sleep current, 4 MHz execution speed, and small SOIC-28 footprint. Firmware generates IR or RF carrier modulation via timer-driven port toggling, while the Watchdog Timer with on-chip RC oscillator wakes the MCU periodically to check inputs. The static CMOS core allows the system clock to be stopped between user events to extend battery life to multi-year levels in intermittent-use applications.
Được đề xuất
Automotive Body Electronics (Non-Safety)
Within non-safety body electronics such as interior lighting controllers, seat-position memory modules, or HVAC damper actuators, the PIC16C55AT-04/SO provides the I/O count and deterministic timing needed for relay and stepper-motor sequencing. The industrial-temperature variant PIC16C55AT-04I/SO supports -40C to +85C cabin environments. Although automotive safety-critical functions now require newer parts, legacy 12V body modules continue to use this PIC16C5X family due to long-term firmware stability and supply-chain maturity.
Được đề xuất
Industrial Sensor Interfaces
Industrial sensor-interface boards with discrete digital inputs/outputs - such as limit-switch aggregators, simple counters, or contact-debounce modules - can use the PIC16C55AT-04/SO as a low-cost protocol converter or local aggregator. With 20 I/O pins, 24 bytes RAM, and a built-in Watchdog Timer for fault recovery, the part handles sensor polling, contact debouncing, and relay sequencing. The SOIC-28 package is industrial-friendly for hand rework on legacy DIN-rail equipment.
Được đề xuất
Toy and Hobby Electronics
Cost-sensitive toy and hobby products - including model train controllers, electronic dice, sound-effect generators, and educational kits - leverage the PIC16C55AT-04/SO's low unit cost, simple RISC core, and 20 I/O pins for motor, LED, and speaker control. The OTP memory secures production firmware against easy duplication. With 33 single-word instructions, beginner firmware developers can quickly master the architecture and bring up working prototypes within a few days.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C55AT-04/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 | PIC16C55AT-04I/SO | PIC16C55A-04/SO | PIC16F54-I/SO | PIC16C554T-04/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-28 (7.50 mm) | SOIC-28 (7.50 mm) - same | SOIC-28 (7.50 mm) - same | SOIC-28 (7.50 mm) - same | SOIC-28 (7.50 mm) - same |
| Program Memory | 768 B OTP | 768 B OTP | 768 B OTP | 768 B Flash | 768 B OTP |
| Memory Type | OTP (one-time programmable) | OTP | OTP | Flash (reprogrammable) | OTP |
| Maximum Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 20 MHz (F-version) | 4 MHz |
| I/O Pins | 20 | 20 | 20 | 12 | 20 |
| UART/USART | No | No | No | No | Yes (SCI/UART) |
| Temperature Range | 0C to +70C (commercial) | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +85C (industrial) | 0C to +70C (commercial) |
Bảo phân biệt quan trọng
- Wide SOIC-28 footprint with 20 I/O pins (vsPIC16C54A-04/SO)
- Industrial temperature variant available in same package (vsPIC16F54-I/SO)
- Direct flash replacement available from same vendor (vsPIC16C554T-04/SO)
Ghi chú thiết kế
The PIC16C55AT-04/SO uses OTP EPROM technology - once programmed, firmware cannot be erased or reprogrammed. A firmware bug in production means scrapping all programmed devices. For prototypes and any design where iteration is expected, use the flash-based PIC16F54-I/SO in the same SOIC-28 footprint for development, then port the final code to PIC16C55AT-04/SO only for locked production. Always program at least 5-10% extra devices for engineering samples and rework.
The PIC16C55AT-04/SO requires a clean 5V supply (4.5V to 5.5V). Place a 0.1uF decoupling capacitor as close as possible to the VDD pin (pin 24) and a bulk capacitor (10uF or larger) at the board-level supply entry. The MCLR reset pin (pin 4) should be pulled up to VDD through a 10k resistor with a 0.1uF capacitor to ground for noise immunity - this RC network prevents false resets in electrically noisy environments such as motor-control applications.
The SOIC-28 wide-body (7.50 mm) package requires standard SMT land patterns per IPC-7351. Ensure each I/O pin trace can handle up to 25 mA source/sink current; use at least 0.2 mm trace width for low-current signals and 0.4 mm or wider for LED or relay drive lines. Place the oscillator crystal or resonator (typically 4 MHz) within 10 mm of pins 6-7 (OSC1/OSC2), and keep oscillator traces short and surrounded by a ground pour to reduce EMI susceptibility.
Thông tin tuân thủ
RoHS, REACH, lead-free, halogen-free, and conflict-mineral statuses were NOT present in the verified web data and are marked as 'unknown'. Engineers should confirm compliance directly with Microchip before volume procurement. AEC-Q100 is not_applicable because this part is not marketed as automotive-qualified.
