PIC16C55-LPI/SS - 768B OTP 8-bit MCU, 20 I/O, SSOP-28 | Microchip
MPN: PIC16C55-LPI/SS ✓ Hoạt độngPIC16C55-LPI/SS Tóm tắt
What is an 8-bit OTP microcontroller? An 8-bit OTP MCU is a small RISC processor with an 8-bit ALU and 8-bit data bus, packaged with non-volatile program memory that can be written exactly once during production programming - making it a cost-optimized alternative to UV-erasable EPROM MCUs and a more secure option than Flash for low-to-medium volume products. Within the embedded hierarchy, the PIC16C5X sits below PIC16 enhanced cores and PIC18, targeting cost-sensitive applications that need deterministic timing and a tiny footprint rather than large code space.
The PIC16C55-LPI variant is specified for the LP oscillator range (typically 200 kHz to 4 MHz crystal) with industrial-grade -40C to +85C operation and low-power quiescent characteristics, distinguishing it from the XT, HS, and RC variants in the same family. Hardware features include an 8-bit real-time clock/counter (TMR0) with programmable prescaler, a two-level deep hardware stack, direct/indirect/relative addressing modes, seven or eight special-function hardware registers, a watchdog timer, power-on reset, and brown-out / power-on reset circuitry. The SSOP-28 footprint and pinout allow direct substitution with other PIC16C5X 28-pin SSOP variants.
Typical applications include low-cost consumer appliances, white-goods user-interface boards, simple sensor front-ends, automotive body controllers, industrial timers and counters, and battery-powered metering nodes. The combination of 20 I/O lines, 768-byte OTP, and a sub-2 mA active current makes it suitable for cost-sensitive designs where the PIC ecosystem (MPLAB IDE, MPASM assembler, MPLAB PM3 programmer) is preferred over more complex ARM Cortex-M parts.
A key design consideration is OTP memory programming: code must be committed at the production line using a Microchip device programmer (e.g., MPLAB PM3) because OTP cannot be erased in-circuit; engineers should plan for firmware-revision discipline and use the JW UV-erasable variant during development. For new designs, Microchip generally recommends Flash-based successors such as PIC16F54 in the same package.
This page synthesizes distributor pricing, drop-in PIC16C5X SSOP-28 alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC16C55-LPI/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 PIC16C55-LPI/SS (cùng hình factor và footprint) — khác nhau ở Package, Program Memory Size, Core Architecture, Timers, Program Memory Type.
PIC16C55A-04I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55-LPE/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55T-LPI/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55-10I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C54-LPI/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F54-I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55-LPI/SS Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit PIC RISC |
| Family | PIC16C5X |
| Series | PIC16C55 |
| Program Memory Type | OTP (One-Time-Programmable) EPROM |
| Program Memory Size | 512 x 12 words (768 bytes) |
| Data RAM | 24 bytes |
| Instruction Width | 12-bit |
| Data Path Width | 8-bit |
| Maximum I/O Pins | 20 |
| Hardware Stack Levels | 2 |
| Timers | 1 x 8-bit (TMR0 with prescaler) |
| Oscillator Type | LP (Low-Power Crystal, ~200 kHz-4 MHz input) |
| Điện áp cung cấp | 3.0 V to 6.25 V (typical 5 V operation) |
| Tần số xung maksimum | 4 MHz oscillator input (LP grade) |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Hộp | 28-pin SSOP (0.209 inch / 5.30 mm width) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant (verify by lot - some OTP PIC16C5X SKUs are non-RoHS) |
| Lead-Free | Yes (per Microchip marking convention) |
Cấu hình chân PIC16C55-LPI/SS
| 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 (shared with RA4) |
| Chân 4 | RA4 — Bidirectional I/O port A bit 4 / T0CKI |
| Chân 5 | MCLR — Master Clear (reset) input, active low |
| Chân 6 | VSS — Ground reference |
| Chân 7 | OSC1 — Oscillator crystal input / external clock |
| Chân 8 | OSC2 — Oscillator crystal output |
| Chân 9 | RB0 — Bidirectional I/O port B bit 0 |
| Chân 10 | RB1 — Bidirectional I/O port B bit 1 |
| Chân 11 | RB2 — Bidirectional I/O port B bit 2 |
| Chân 12 | RB3 — Bidirectional I/O port B bit 3 |
| Chân 13 | RB4 — Bidirectional I/O port B bit 4 |
| Chân 14 | RB5 — Bidirectional I/O port B bit 5 |
| Chân 15 | RB6 — Bidirectional I/O port B bit 6 |
| Chân 16 | RB7 — Bidirectional I/O port B bit 7 |
| Chân 17 | RC0 — Bidirectional I/O port C bit 0 |
| Chân 18 | RC1 — Bidirectional I/O port C bit 1 |
| Chân 19 | RC2 — Bidirectional I/O port C bit 2 |
| Chân 20 | RC3 — Bidirectional I/O port C bit 3 |
| Chân 21 | RC4 — Bidirectional I/O port C bit 4 |
| Chân 22 | RC5 — Bidirectional I/O port C bit 5 |
| Chân 23 | RC6 — Bidirectional I/O port C bit 6 |
| Chân 24 | RC7 — Bidirectional I/O port C bit 7 |
| Chân 25 | RD0 — Bidirectional I/O port D bit 0 |
| Chân 26 | RD1 — Bidirectional I/O port D bit 1 |
| Chân 27 | RD2 — Bidirectional I/O port D bit 2 |
| Chân 28 | VDD — Positive supply (3.0 V to 6.25 V, typically 5 V) |
Ứng dụng tiêu biểu
PIC16C55-LPI/SS phù hợp cho 7 Áp dụngs: Consumer Appliance Control Boards, Industrial Timers and Counters, Automotive Body Electronics, Battery-Powered Sensor Front-Ends, LED Display and Sign Controllers, Educational and Hobbyist Microcontroller Kits, Remote Control and IR Receiver Boards.
Consumer Appliance Control Boards
The PIC16C55-LPI/SS is well suited to low-cost user-interface boards in white goods such as microwave ovens, washing machines, and rice cookers, where its 20 digital I/O pins can directly drive 7-segment LED displays, keypad matrix scanning, and relay/MOSFET control outputs. The 768-byte OTP program memory holds typical appliance state machines and timing routines comfortably, while the LP oscillator grade keeps standby current low for Energy Star compliance. Combined with its 5 V operation and small SSOP-28 footprint, it enables compact PCBAs at BOM cost below $1.50 in volume.
Được đề xuất
Industrial Timers and Counters
In industrial timer, counter, and sequence-controller modules the PIC16C55-LPI/SS provides a deterministic 8-bit RISC core with a hardware TMR0 timer/counter and programmable prescaler that handles pulse counting and time-base generation without software overhead. The 24-byte RAM and 768-byte OTP are sufficient for simple ladder-logic replacements, while the -40C to +85C industrial temperature range supports factory-floor deployment. The SSOP-28 package and 5 V supply integrate easily with existing 24V->5V logic-level interface boards.
Được đề xuất
Automotive Body Electronics
Inside automotive body controllers - window lift modules, mirror adjusters, seat controllers, and simple lighting drivers - the PIC16C55-LPI/SS delivers the deterministic interrupt response of the PIC16C5X core plus 20 I/O lines to read switches and drive small loads via external MOSFETs. The LP oscillator grade reduces quiescent current for always-on body modules, while the -40C to +85C industrial temperature range covers passenger-compartment environments. For under-hood deployment, Microchip recommends the AEC-Q100-qualified PIC16F series successors instead.
Được đề xuất
Battery-Powered Sensor Front-Ends
Battery-powered sensor nodes such as remote thermostats, simple weather stations, and utility metering transmitters benefit from the PIC16C55-LPI/SS's LP oscillator grade, which supports 32.768 kHz watch-crystal operation for sub-100 uA active current. The 24-byte RAM is adequate for buffering periodic sensor readings before transmitting them via UART or simple GPIO bit-banging. The 768-byte OTP holds compact protocol stacks and calibration data, while the 28-pin SSOP keeps the PCB small enough to fit in standard AAA-battery enclosures.
Được đề xuất
LED Display and Sign Controllers
Small LED matrix signs, channel-letter controllers, and decorative lighting drivers use the PIC16C55-LPI/SS to multiplex 8x8 LED arrays via its 20 I/O pins, with TMR0 generating the row-refresh interrupt for flicker-free persistence-of-vision operation. The 5 MIPS instruction throughput at 4 MHz oscillator is more than enough for Charlieplexing patterns and DMX-512-like bit-banged protocols. Its SSOP-28 footprint and 5 V operation simplify integration with constant-current LED driver ICs, while OTP memory protects the lighting pattern IP from casual copying.
Được đề xuất
Educational and Hobbyist Microcontroller Kits
The PIC16C55-LPI/SS serves as a teaching platform in university embedded-systems courses and DIY maker projects thanks to its simple 12-bit PIC16C5X instruction set, single 5 V supply, and free MPLAB IDE plus MPASM assembler toolchain. Students can learn timer/counter fundamentals, GPIO bit manipulation, and interrupt-driven programming using only 24 bytes of RAM and 768 bytes of OTP, with code examples published in countless textbooks since the 1990s. The SSOP-28 breakout boards available from Microchip Direct and LCSC make hand-soldering feasible for advanced hobbyists.
Được đề xuất
Remote Control and IR Receiver Boards
Universal remote controls, IR/RF receiver base stations, and simple garage-door keypads leverage the PIC16C55-LPI/SS's 8-bit TMR0 for accurate IR protocol timing (NEC, RC5, Sony SIRC) and its 20 I/O pins to scan 4x4 key matrices while driving status LEDs. The LP oscillator grade supports 32.768 kHz to 4 MHz crystals used in low-power IR receiver standby. With 768 bytes OTP, the device can store protocol libraries for 3-4 common IR formats plus user-configuration data, all in a tiny SSOP-28 PCB footprint.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C55-LPI/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 | PIC16C55A-04I/SS | PIC16C55-LPE/SS | PIC16C55T-LPI/SS | PIC16C55-10I/SS | PIC16C54-LPI/SS | PIC16F54-I/SS |
|---|---|---|---|---|---|---|---|
| Package | 28-SSOP (0.209 inch) | 28-SSOP (0.209 inch) - same | 28-SSOP (0.209 inch) - same | 28-SSOP (0.209 inch) - same | 28-SSOP (0.209 inch) - same | 28-SSOP (0.209 inch) - same | 28-SSOP (0.209 inch) - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Program Memory | 768 B OTP | 768 B OTP | 768 B OTP | 768 B OTP | 768 B OTP | 512 B OTP (smaller) | 512 B Flash (reprogrammable) |
| Data RAM | 24 B | 24 B | 24 B | 24 B | 24 B | 25 B | 25 B |
| I/O Pins | 20 | 20 | 20 | 20 | 20 | 12 (smaller port count) | 12-20 (variant dependent) |
| Oscillator Grade | LP (low-power, up to ~4 MHz) | 04 (4 MHz) | LP (low-power) | LP (low-power) | 10 MHz rated | LP (low-power) | Wide range with internal oscillator |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C |
| Memory Type | OTP (one-time programmable) | OTP | OTP | OTP | OTP | OTP | Flash (re-programmable) |
| Supply Voltage | 3.0 V to 6.25 V | 3.0 V to 6.25 V | 3.0 V to 6.25 V | 3.0 V to 6.25 V | 3.0 V to 6.25 V | 3.0 V to 6.25 V | 2.0 V to 5.5 V |
Bảo phân biệt quan trọng
- Industrial -40C to +85C temperature grade in LP low-power oscillator variant (vsPIC16C55-LPE/SS)
- LP oscillator grade optimized for low-power 32.768 kHz watch-crystal operation (vsPIC16C55-10I/SS)
- 20 I/O pins in SSOP-28 footprint (vsPIC16C54-LPI/SS)
- Direct same-die SSOP-28 replacement with Flash reprogrammability (vsPIC16F54-I/SS)
Ghi chú thiết kế
OTP (one-time-programmable) memory can be written only once. Use the PIC16C55/JW UV-erasable CERDIP variant for firmware development and bring-up, then switch to the PIC16C55-LPI/SS only when the code is fully validated. Any code bug committed to OTP memory cannot be corrected in-circuit and requires mechanical replacement of the MCU on every faulty board, which destroys production yield and field-repair economics.
The PIC16C55-LPI/SS is designed for the LP low-power crystal oscillator grade; supply decoupling must include a 100 nF ceramic capacitor placed within 5 mm of VDD (pin 28) and a 10 uF bulk capacitor on the main 5 V rail. The MCLR pin (pin 5) requires an external 10 kohm pull-up to VDD plus a 100 nF decoupling cap to ground to prevent spurious resets during power-up brown-out events; do not leave MCLR floating.
For SSOP-28 layout, use 0.65 mm pitch land patterns with 0.4 mm wide pads and a 0.3 mm solder-mask opening. Route VDD/VSS as a 0.5 mm-wide power pair on the top layer with a continuous ground pour on layer 2 to provide a low-impedance return path for the oscillator. Place the LP crystal within 5 mm of OSC1 (pin 7) and OSC2 (pin 8) and guard the traces with a ground ring to reduce EMI pickup on the low-amplitude oscillator node.
The PIC16C55-LPI/SS in SSOP-28 has a thermal resistance (theta_JA) of approximately 100 C/W on a standard JEDEC 2S2P test board, meaning full-power continuous operation at 70C ambient will keep the junction below 90C at the worst-case 30 mA active current. In most cost-sensitive appliance designs total active dissipation stays below 150 mW, so no heatsink is required. Verify with on-board thermal profiling if the design forces 100% duty-cycle CPU activity.
Do not confuse the PIC16C55-LPI/SS (industrial -40C to +85C, LP oscillator) with the PIC16C55-LPE/SS (commercial 0C to +70C, LP oscillator) - both share the SSOP-28 footprint but the temperature grade difference can cause field failures in outdoor or automotive applications. The PIC16C5X instruction set is also incompatible with PIC16 enhanced cores (PIC16F1xxx); firmware written for PIC16C55 does not run on PIC16F690 without complete rewrite and re-assembly.
Thông tin tuân thủ
RoHS and REACH compliance confirmed per Microchip PIC16C5X family product page; specific lot compliance certificates available on Microchip Direct. Not AEC-Q100 qualified; choose PIC16F-series automotive parts for under-hood deployments. Halogen-free status not explicitly stated in provided data - treat as 'unknown' until verified via manufacturer certificate of compliance.
