PIC16C642-04I/SP - 8-bit OTP MCU, 7KB EPROM, 22 I/O | Microchip
MPN: PIC16C642-04I/SP ✓ Hoạt độngPIC16C642-04I/SP Tóm tắt
What is an OTP 8-bit microcontroller? An OTP microcontroller is a class of embedded controller that uses one-time-programmable EPROM to store firmware, offering a low-cost path for volume production after prototype validation. Microcontrollers of this type sit at the bottom of the embedded hierarchy: MCU -> 8-bit MCU -> CMOS MCU -> EPROM/OTP MCU -> peripheral-rich industrial controller. The PIC16C642 family is part of the PIC16C6x mid-range series, integrating the CPU, EPROM program store, RAM data memory, timers, comparators, and a programmable voltage reference in a single chip.
Key features include 7 KB (4K x 14) of program memory, 176 bytes of data RAM, 22 I/O pins, one 8-bit Timer/Counter with an 8-bit programmable prescaler, two analog comparators with a programmable on-chip voltage reference, and a watchdog timer for reliable unattended operation. The device is specified across the industrial temperature range of -40 °C to +85 °C and supports a maximum clock of 4 MHz (the "04" speed suffix), giving a 1 µs instruction cycle. Brown-out detection and power-on reset are provided for robust embedded behavior.
Typical applications include industrial control systems, appliance controls, security and alarm panels, instrumentation front-ends, automotive body electronics (non-safety), and educational development platforms where a windowed/UV-erasable or OTP variant is acceptable for cost reasons. The two on-chip comparators make the part especially suitable for analog signal conditioning and threshold detection without an external op-amp.
When designing with the PIC16C642-04I/SP, ensure that the oscillator configuration matches the application - the '04' suffix limits the device to a 4 MHz max clock. Because the SP package is through-hole SPDIP-28, it is preferred for prototype, hobby, and educational environments where DIP sockets simplify rework; consider the SOIC or windowed ceramic variants for surface-mount production or development/programming cycles.
Bộ thay thế dễ dàng lắp đặt cho PIC16C642-04I/SP — 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 PIC16C642-04I/SP (cùng hình factor và footprint) — khác nhau ở Program Memory Type, Program Memory Size, Operating Temperature, Timers, RAM Size.
PIC16C642-04E/SP
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C642-04/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C622-04/P
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16C621-04I/P
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16C620A-04I/P
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C642-04I/SP Tỷ lệ tối đa & tính chất điện
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4K x 14) |
| Data RAM | 176 bytes |
| I/O Pins | 22 |
| CPU Architecture | 8-bit PIC RISC |
| Instruction Set | 35 single-word instructions |
| Max Clock Frequency | 4 MHz |
| Instruction Cycle Time | 1 µs (200 ns for internal branches) |
| Supply Voltage (Vdd) | 4 V to 5.5 V |
| Nhiệt độ hoạt động | -40 °C to +85 °C (Industrial) |
| Hộp | SPDIP-28 (Skinny Plastic DIP, 0.300 inch) |
| Kiểu lắp đặt | Through-Hole |
| Timers | 1 x 8-bit Timer/Counter with 8-bit prescaler |
| Analog Comparators | 2 with programmable on-chip voltage reference |
| Watchdog Timer | Yes |
| Brown-out Reset / Power-on Reset | Yes |
| Speed Grade Suffix | 04 (4 MHz max) |
Cấu hình chân PIC16C642-04I/SP
| Chân 1 | MCLR/Vpp — Master Clear (Reset) input / Programming voltage |
| Chân 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Chân 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Chân 5 | RA3/AN3 — PORTA bit 3 / Analog input 3 |
| Chân 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 7 | RA5/SS — PORTA bit 5 / Synchronous Serial port select |
| Chân 8 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Chân 9 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Chân 10 | RC0 — PORTC bit 0 |
| Chân 11 | RC1 — PORTC bit 1 |
| Chân 12 | RC2 — PORTC bit 2 |
| Chân 13 | RC3 — PORTC bit 3 |
| Chân 14 | RC4 — PORTC bit 4 |
| Chân 15 | RC5 — PORTC bit 5 |
| Chân 16 | RC6 — PORTC bit 6 |
| Chân 17 | RC7 — PORTC bit 7 |
| Chân 18 | RB0/INT — PORTB bit 0 / External interrupt input |
| Chân 19 | Vss — Ground reference |
| Chân 20 | VDD — Positive supply voltage |
| Chân 21 | RB1 — PORTB bit 1 |
| Chân 22 | RB2 — PORTB bit 2 |
| Chân 23 | RB3 — PORTB bit 3 |
| Chân 24 | RB4 — PORTB bit 4 |
| Chân 25 | RB5 — PORTB bit 5 |
| Chân 26 | RB6 — PORTB bit 6 |
| Chân 27 | RB7 — PORTB bit 7 |
| Chân 28 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC16C642-04I/SP phù hợp cho 7 Áp dụngs: Industrial Control Systems, Appliance Control (Washers, Ovens, HVAC), Security and Alarm Panels, Instrumentation Front-Ends, Automotive Body Electronics (Non-Safety), Educational and Hobby Development, LED Lighting and Display Drivers.
Industrial Control Systems
The PIC16C642-04I/SP fits industrial control applications where its 22 I/O pins handle sensor inputs, relay drivers, and HMI buttons. The two on-chip analog comparators with programmable voltage reference enable direct threshold detection on process variables without external op-amps, while the watchdog timer and brown-out reset ensure reliable unattended operation on factory floors. Industrial-grade -40 to +85 C temperature range supports deployment in enclosures with elevated ambient temperatures. Pin-compatible variants in the PIC16C62x/64x family allow firmware upgrades within the same PCB footprint as system requirements evolve.
Được đề xuất
Appliance Control (Washers, Ovens, HVAC)
White-goods controllers benefit from the PIC16C642-04I/SP's combination of 22 I/O lines for keypad scanning, LED/relay drivers, and triac interfaces. The 4 MHz core executes control-loop firmware at 1 µs per instruction, easily handling PID temperature regulation for ovens and motor speed sequencing for washing machines. Brown-out reset and the watchdog timer protect against supply glitches during compressor inrush, while the on-chip voltage reference simplifies sensor-bridge excitation for thermistor/RTD inputs.
Được đề xuất
Security and Alarm Panels
The PIC16C642-04I/SP's 22 I/O and two analog comparators support multi-zone security panels: each zone input can be routed through an on-chip comparator for window/door-loop threshold detection without external circuitry. The 7 KB OTP EPROM holds arm/disarm state machines and communication protocol stacks. Industrial temperature range ensures operation in unheated garages and basements, while the watchdog timer recovers the system from lockup caused by EMI transients from siren drivers.
Được đề xuất
Instrumentation Front-Ends
Bench instruments and data-loggers benefit from the PIC16C642-04I/SP's two comparators and programmable voltage reference for threshold and window-detection on analog channels. The 22 I/O pins drive LCD segment controls, push-button menus, and RS-232 level shifters. The 176-byte RAM buffers measurement samples before UART transmission, while the 4 MHz instruction rate (1 µs) gives ample margin for software UART at 9600 baud. Through-hole SPDIP packaging supports hand-soldered prototype builds common in lab instrumentation.
Được đề xuất
Automotive Body Electronics (Non-Safety)
Body-control accessories such as seat controllers, mirror adjusters, and interior lighting modules can use the PIC16C642-04I/SP in non-safety automotive applications. The two analog comparators detect current-sense thresholds for short-circuit protection on lamp drivers, while the 22 I/O drive multiple MOSFET half-bridges. Industrial temperature grade handles cabin environments reliably. For under-hood safety-critical functions, migrate to a Q100-qualified PIC18 or dsPIC part instead.
Được đề xuất
Educational and Hobby Development
The PIC16C642-04I/SP's DIP-28 package is breadboard-friendly and pairs naturally with Microchip's PICStart Plus or MPLAB PM3 programmers for student projects. The 35-instruction RISC architecture is approachable for learners, while the 7 KB EPROM holds substantial textbook-style projects (digital thermometer, stopwatch, IR remote decoder). The two on-chip comparators let students explore analog signal conditioning without external op-amps, building intuition for mixed-signal design that transfers to later PIC16F/PIC18 platforms.
Được đề xuất
LED Lighting and Display Drivers
The PIC16C642-04I/SP can drive LED matrix displays and decorative lighting strips via PWM-like bit-banging on its 22 I/O pins, while the on-chip timer/counter with 8-bit prescaler generates precise refresh intervals. The two comparators sense current-sense amplifier outputs for shorted-LED protection. Industrial temperature range supports outdoor signage enclosures. For new designs requiring higher PWM resolution and lower power, consider the flash-based PIC16F887-I/P migration path with hardware PWM modules.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C642-04I/SP — 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 | PIC16C642-04E/SP | PIC16C642-04/SO | PIC16C622-04/P | PIC16C621-04I/P | PIC16C620A-04I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SPDIP-28 | SPDIP-28 - same | SPDIP-28 (same body, but commercial temp grade) | SPDIP-28 - same | SPDIP-28 - same | SPDIP-28 - same |
| Program Memory (KB) | 7 KB (4K x 14) OTP EPROM | 7 KB (same die) | 7 KB (same die) | 3.5 KB | 1.75 KB | 0.875 KB |
| Data RAM (bytes) | 176 | 176 | 176 | 128 | 80 | 96 |
| I/O Pins | 22 | 22 | 22 | 22 | 13 | 13 |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| Analog Comparators | 2 with Vref | 2 with Vref | 2 with Vref | 2 with Vref | 1 | 1 |
Bảo phân biệt quan trọng
- Largest program memory in the PIC16C64x sibling family (vsPIC16C641)
- Two on-chip comparators with programmable Vref (vsPIC16C621-04I/P)
- 176 bytes of RAM for buffering (vsPIC16C622-04/P)
Ghi chú thiết kế
Place a 0.1 µF decoupling capacitor as close as possible to the Vdd pin (pin 20) of the PIC16C642-04I/SP, with a short trace to Vss (pin 19). For designs with high-current peripheral switching (relays, solenoids), add a bulk 10 µF electrolytic or tantalum capacitor on the main 5 V rail to absorb inrush current. Microchip's PIC16C64X datasheet recommends a low-ESR bypass within 5 mm of the supply pins to prevent EPROM read errors caused by Vdd droop during code execution.
The '04' suffix limits the PIC16C642-04I/SP to 4 MHz maximum clock input. When using a crystal oscillator, select a fundamental-mode 4 MHz crystal with appropriate load capacitors (typically 15-33 pF on each leg of OSC1/OSC2). Do not use overtone crystals - the internal oscillator amplifier is designed for fundamental-mode operation. For noisy environments, prefer the HS (high-speed) oscillator mode above 4 MHz parts rather than the LP mode to maximize noise immunity.
Keep the MCLR/Vpp pin (pin 1) trace short and avoid routing noisy digital signals nearby, because this pin is sensitive to fast-edge noise that could trigger spurious resets. Microchip recommends a 10 kΩ pull-up on MCLR tied to Vdd, with an optional 100 nF cap to ground for noise immunity. For ICSP (in-circuit serial programming), bring Vpp, RB6 (PGC) and RB7 (PGD) to an in-line header to allow MPLAB PM3 / PICkit 3 programming without removing the MCU from the board.
Do not exceed the absolute maximum Vdd of 7.0 V on the PIC16C642-04I/SP, and never apply voltage to MCLR/Vpp above 13.5 V or EPROM programming will fail. The 4 MHz speed grade cannot be overclocked - attempting to drive OSC1 with a 10 MHz or 20 MHz signal will produce timing violations and unreliable EPROM reads. Finally, OTP parts cannot be reprogrammed, so plan for a UV-erasable windowed variant (e.g., PIC16C642-04/JW) during firmware development cycles.
Thông tin tuân thủ
RoHS and lead-free status not stated in the provided web data; the SPDIP-28 industrial temp grade is generally not RoHS in original Microchip ordering codes (typical lead finish). AEC-Q100 not qualified - this part targets industrial, not automotive safety applications. Conflict-mineral statement assumed compliant per Microchip standard policy.
