PIC16C55-RCE/SO - 8-Bit 4MHz OTP MCU 768B 28-SOIC | Microchip
MPN: PIC16C55-RCE/SO ⚠ Lần mua cuốiPIC16C55-RCE/SO Tóm tắt
An OTP microcontroller is a variant of EPROM-based MCU where the program memory can be written exactly once at programming time, after which it behaves like masked-ROM silicon. Compared with flash-based MCUs, OTP parts offer lower per-unit cost at high volume, smaller silicon area, and stronger data retention because there is no charge pump or Fowler-Nordheim tunnel oxide to age. These advantages made the PIC16C5x family ubiquitous in late-1990s and early-2000s appliance, sensor, and consumer products where code stability was final on first programming.
The PIC16C55-RCE/SO executes most instructions in a single 250 ns cycle (4 MHz / 4) thanks to a 4-clock-per-instruction core, yielding roughly 4 MIPS peak throughput. The 33-instruction RISC set is highly orthogonal, the 8-level deep hardware stack simplifies interrupt-free subroutines, and the 12-bit instruction width yields a typical 2:1 code density advantage over competing 8-bit CISC MCUs. Two hardware timers (8-bit RTCC + WDT), a Power-On Reset (POR), and brown-out protection are integrated. There is no on-chip ADC, UART, or I2C peripheral; the device is intended as a glue controller in simple digital subsystems.
The 28-pin SOIC footprint matches the PIC16C55A and PIC16C55A-EP successors that offer expanded RAM (72 B vs 24 B) and higher oscillator options, allowing PCB-level drop-in migration. Pin 1 (RA2), pin 20 (Vss) and pin 28 (VDD) keep the same port assignments, and the external RC/HS/LP/XT oscillator pins (OSC1 / OSC2 / CLKOUT / CLKIN) remain fixed across the family, easing engineering change orders.
Typical applications include washing-machine user-interface boards, dishwasher cycle controllers, microwave oven keypads, hobby servomotor drivers, low-end thermostat logic, fan and pump speed controllers, and PC peripheral front panels. Designers also use it as a supervisor companion next to a host processor - the 20 mA sink/source capability on every I/O pin is sufficient to drive relays through a discrete transistor.
A key design consideration: OTP cannot be re-programmed in-circuit. Provision a stable prototype path using a windowed JW or a flash sibling (PIC16F54 in SOIC-28) for firmware iteration, then move to the OTP -RCE/SO for production. The /RC oscillator option (suffix 'RC') allows an external resistor/capacitor timing network and eliminates the cost of a crystal in cost-sensitive designs.
This page synthesizes distributor pricing, parametric comparisons against active family members, and practical design notes (oscillator trade-offs, OTP programming flow, migration path to PIC16C55A and PIC16F54) not aggregated in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho PIC16C55-RCE/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 PIC16C55-RCE/SO (cùng hình factor và footprint) — khác nhau ở Package, Timers, Program Memory Type, Maximum Clock Frequency, Operating Temperature Range.
PIC16C55A-04I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55A-20I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F54-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55-10I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55-10/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C554-04I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55-RCE/SO Tỷ lệ tối đa & tính chất điện
| Core | PIC 8-bit RISC (Harvard) |
| Instruction Set Architecture | 12-bit wide, 33 instructions |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 768 bytes (512 x 12) |
| RAM Size | 24 bytes |
| EEPROM | None (not present on die) |
| Maximum CPU Clock Frequency | 4 MHz |
| Instruction Cycle Time | 250 ns (4 MHz / 4) |
| Supply Voltage (Vdd) | 3.0 V to 6.0 V |
| I/O Pins | 20 (PORTA 4-bit + PORTB 8-bit + PORTC 8-bit) |
| Timers | 1 x 8-bit RTCC + 1 x Watchdog Timer (WDT) |
| Peripherals | POR (Power-On Reset), WDT |
| ADC | None |
| Communication Interfaces | None (no UART, SPI, or I2C on-die) |
| Oscillator Modes | RC, LP, XT, HS (selected by suffix and configuration bits) |
| Khoảng nhiệt độ hoạt động | 0C to +70C (commercial; see suffix) |
| Hộp | 28-pin SOIC (SO) - narrow body, 7.50 mm |
| Kiểu lắp đặt | Surface Mount |
| Lead Finish | Matte tin (Pb-free) per JEDEC J-STD-020 |
| Cấp MSL | 1 (unlimited floor life at <30C/85% RH) |
Cấu hình chân PIC16C55-RCE/SO
| Chân 1 | RA2 — PORTA bit 2 (bidirectional digital I/O) |
| Chân 2 | RA3 — PORTA bit 3 (bidirectional digital I/O) |
| Chân 3 | RTCC — Real-Time Clock/Counter input (T0CKI) |
| Chân 4 | MCLR — Master Clear reset input (active low) |
| Chân 5 | VSS — Ground reference |
| Chân 6 | RB0 — PORTB bit 0 (bidirectional digital I/O) |
| Chân 7 | RB1 — PORTB bit 1 (bidirectional digital I/O) |
| Chân 8 | RB2 — PORTB bit 2 (bidirectional digital I/O) |
| Chân 9 | RB3 — PORTB bit 3 (bidirectional digital I/O) |
| Chân 10 | RB4 — PORTB bit 4 (bidirectional digital I/O) |
| Chân 11 | RB5 — PORTB bit 5 (bidirectional digital I/O) |
| Chân 12 | RB6 — PORTB bit 6 (bidirectional digital I/O) |
| Chân 13 | RB7 — PORTB bit 7 (bidirectional digital I/O) |
| Chân 14 | VSS — Ground reference |
| Chân 15 | OSC1 — Oscillator input (RC, XT, HS, LP modes) |
| Chân 16 | OSC2 — Oscillator output / CLKOUT |
| Chân 17 | RC0 — PORTC bit 0 (bidirectional digital I/O) |
| Chân 18 | RC1 — PORTC bit 1 (bidirectional digital I/O) |
| Chân 19 | RC2 — PORTC bit 2 (bidirectional digital I/O) |
| Chân 20 | RC3 — PORTC bit 3 (bidirectional digital I/O) |
| Chân 21 | RC4 — PORTC bit 4 (bidirectional digital I/O) |
| Chân 22 | RC5 — PORTC bit 5 (bidirectional digital I/O) |
| Chân 23 | RC6 — PORTC bit 6 (bidirectional digital I/O) |
| Chân 24 | RC7 — PORTC bit 7 (bidirectional digital I/O) |
| Chân 25 | VSS — Ground reference |
| Chân 26 | RA0 — PORTA bit 0 (bidirectional digital I/O) |
| Chân 27 | RA1 — PORTA bit 1 (bidirectional digital I/O) |
| Chân 28 | VDD — Positive supply voltage (3.0 V to 6.0 V) |
Ứng dụng tiêu biểu
PIC16C55-RCE/SO phù hợp cho 7 Áp dụngs: Washing Machine and Dishwasher Cycle Controllers, Microwave Oven and Cooktop User Interface Boards, Low-End Thermostat and HVAC Fan Controllers, PC Peripheral Front Panels (Printer, Scanner, Router LEDs), Hobby Servo and RC Motor Drivers, Sensor Front-End and Signal Conditioning Modules, Toy and Educational Electronics.
Washing Machine and Dishwasher Cycle Controllers
The PIC16C55-RCE/SO fits appliance-control boards where firmware is fixed at first programming and cost-per-unit matters more than field re-programmability. The 4 MIPS throughput comfortably executes motor-timer state machines, water-level sequencing, and latched relay drive patterns, while 20 mA sink/source per pin drives triacs through MOC3021 optocouplers. The 4 MHz RC oscillator option eliminates the crystal cost in price-sensitive washer SKUs. Designers value the 28-SOIC footprint because it is shared with PIC16C55A drop-in upgrades that add 72-byte RAM.
Được đề xuất
Microwave Oven and Cooktop User Interface Boards
Microwave keypads, LED indicators, and buzzer patterns map cleanly onto 20 digital I/O lines and the 8-bit RTCC timer. The PIC16C55-RCE/SO's 768-byte OTP holds the standard cooking-cycle code, and 24-byte RAM is sufficient for the cook-time buffer and current state. The Harvard 12-bit instruction width gives roughly 2:1 code density versus 8051 CISC, allowing longer preset menus without stepping up to PIC16C55A. The 28-SOIC footprint reflows reliably on the wave-solder-line consumer-appliance lines common in white-goods manufacturing.
Được đề xuất
Low-End Thermostat and HVAC Fan Controllers
Residential thermostats typically sample temperature every 5-10 seconds, run a hysteresis control loop, and switch a relay. The PIC16C55-RCE/SO handles this loop in <5% of CPU time at 4 MHz, leaving the rest for debounced keypad scanning. The 24-byte RAM holds current setpoint, measured temperature, and relay state, while the 768-byte OTP holds the full state machine and NTC-thermistor linearization table. Industrial-grade (-40C to +85C) PIC16C55-10I/SO is the drop-in alternative for outdoor HVAC cabinets.
Được đề xuất
PC Peripheral Front Panels (Printer, Scanner, Router LEDs)
Older PC peripherals use a small MCU to drive status LEDs, scan buttons, and respond to host commands over a proprietary 1-wire or UART link. The PIC16C55-RCE/SO drives 20 mA LEDs directly from PORTB pins and reads a 4 x 5 keypad matrix via PORTA/PORTC. The lack of on-die UART is compensated by bit-banged serial firmware. The 28-SOIC footprint is compatible with PIC16C55A when product variants need higher RAM for status logging.
Được đề xuất
Hobby Servo and RC Motor Drivers
The PIC16C55-RCE/SO is widely used in hobby robotics to generate up to 8 simultaneous 50 Hz PWM servo-control signals from software loops and bit-banged timing. The 250 ns instruction cycle yields ~20 servo-position steps per millisecond, which exceeds standard RC servo resolution. The 24-byte RAM holds up to 8 servo targets and a main-loop counter, and the 20 I/O pins drive eight servos plus an enable line. The 28-SOIC is small enough for quadcopter flight-controller daughter boards.
Được đề xuất
Sensor Front-End and Signal Conditioning Modules
Many industrial sensor modules use a PIC16C55-RCE/SO as a watchdog and lead-zero generator for an external ADC such as MCP3202. The MCU commands the ADC via SPI bit-banging, reads the result, and drives a 4-20 mA current loop. The 768-byte OTP holds the calibration table for the sensor range, and the 24-byte RAM holds the latest sample plus moving-average buffer. The 28-SOIC footprint reflows on the same line as 4-20 mA transmitter boards, and PIC16C55A is the drop-in when more RAM is needed for self-calibration sequences.
Được đề xuất
Toy and Educational Electronics
Mass-market toys use the PIC16C55-RCE/SO because the OTP cost structure is the lowest in the Microchip 8-bit family, and the 28-SOIC is easily assembled by automated pick-and-place. Sound playback, motor sequencing, and LED animations fit comfortably in 768 bytes with 4 MIPS throughput. The wide 3.0 V to 6.0 V supply range accepts two, three, or four AA cells without a boost regulator, simplifying the BOM for educational-kits and entry-level consumer electronics.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C55-RCE/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 | PIC16C55A-04I/SO | PIC16C55A-20I/SO | PIC16F54-I/SO | PIC16C55-10I/SO | PIC16C55-10/SO | PIC16C554-04I/SO |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC | 28-SOIC (same) | 28-SOIC (same) | 28-SOIC (same) | 28-SOIC (same) | 28-SOIC (same) | 28-SOIC (same) |
| Core | PIC16C5x 8-bit RISC | PIC16C5x 8-bit RISC (same) | PIC16C5x 8-bit RISC (same) | PIC16F5x 8-bit RISC flash | PIC16C5x 8-bit RISC (same) | PIC16C5x 8-bit RISC (same) | PIC16C55x 8-bit RISC (14-bit opcodes) |
| Program Memory | 768 B (512 x 12) OTP | 768 x 12 OTP (same) | 768 x 12 OTP (same) | 512 B flash (-33%) | 768 x 12 OTP (same) | 768 x 12 OTP (same) | 512 x 14 OTP (different op width) |
| RAM Size | 24 B | 72 B (+200%) | 72 B (+200%) | 25 B (+4%) | 24 B (same) | 24 B (same) | 80 B (+233%) |
| Maximum CPU Clock | 4 MHz (1 MIPS) | 4 MHz (same) | 20 MHz (+400%) | 20 MHz (+400%) | 4 MHz (same) | 4 MHz (same) | 4 MHz (same) |
| Operating Temperature | 0C to +70C | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | 0C to +70C (same) | -40C to +85C (industrial) |
| UART / ADC | None | None (same) | None (same) | None (same) | None (same) | None (same) | UART (added) |
Bảo phân biệt quan trọng
- Larger RAM than -RCE variant only after upgrade to PIC16C55A (vsPIC16C55A-04I/SO)
- OTP is one-time programmable - flash alternative exists at lower cost (vsPIC16F54-I/SO)
- Industrial temperature grade sibling available in same footprint (vsPIC16C55-10I/SO)
Ghi chú thiết kế
Place a 100 nF ceramic decoupling capacitor within 5 mm of pin 28 (VDD), with a short trace to pin 5/14/25 VSS. PIC16C5x I/O transitions create ~20 mA current spikes from each PORTB/PORTC pin; an insufficient bypass causes VDD droop that can spuriously trigger brown-out or WDT resets. For motor-control boards sharing VDD with relay coils, add a 47 uF bulk electrolytic plus a series ferrite bead to the MCU supply rail. Estimated: 20 mA peak per pin x 8 simultaneously-switched pins = 160 mA peak step; 100 nF must recharge the rail between 1 us and 10 us.
OTP cells can be written exactly once. Never program a production part with development firmware - the part is bricked. For iteration, use a windowed JW package (PIC16C55/JW) or a flash sibling such as PIC16F54-I/SO. Verify programming socket alignment and supply levels (13.5 V Vpp for PIC16C5x) on a programmer like MPLAB PM3 before any production run. The 'RCE' suffix uses an external Crystal/Resonator oscillator and requires correct configuration-bit settings to enable the XT/HS/LP feedback network.
Route OSC1 and OSC2 traces as a short differential pair under 10 mm to prevent oscillator jitter. Place the crystal/resonator within 5 mm of the MCU and ground both leads through 10 pF to 33 pF capacitors. Avoid routing noisy digital signals under the oscillator area. For HS oscillator at 4 MHz or above, add a 100 ohm series resistor on OSC2 to dampen reflections. Keep RB and RC port-traces short to limit EMI radiation on edges switching simultaneously.
PIC16C5x does not support interrupts - the 33-instruction set is purely polled. Plan firmware as a cooperative round-robin state machine rather than relying on ISR handlers. Hardware stack is only 8 deep; recursion and deep nesting will crash. WDT is not disabled by default; set the WDTE configuration bit off if not used, or service the CLRWDT instruction within every 18 ms to 2.3 s window depending on the post-divider.
Thông tin tuân thủ
Pb-free matte-tin lead finish per JEDEC J-STD-020; MSL 1 per J-STD-033. No AEC-Q100 automotive variant exists for PIC16C55-RCE/SO; for AEC-Q100 in 28-SOIC footprint, migrate to PIC16F54-I/SO or PIC16F886-I/SP automotive. REACH SVHC declared compliant per Microchip product declaration.
