PIC16C771/JW - 8-Bit 20MHz 7KB EPROM MCU w/ 12-bit ADC | Microchip
MPN: PIC16C771/JW ✗ Cuối đờiPIC16C771/JW Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and programmable peripheral interfaces. PIC16C77x-series MCUs belong to Microchip's PIC16 mid-range family, which sits hierarchically between the baseline PIC10/12/16 families and the enhanced PIC18 family, and is fully upward code-compatible with the PIC16C5X and PIC12CXXX legacy devices. Mid-range PIC MCUs execute 35 single-word instructions, support interrupts and a hardware multiplier, and provide deterministic real-time control for embedded designs.
Key features of the PIC16C771/JW include 6 channels of 12-bit ADC, an instruction cycle of 200 ns at 20 MHz, 256 bytes of SRAM, 256 bytes of EEPROM data memory, and a synchronous/asynchronous serial port (USART/SCI). The device also integrates a 16-bit timer/counter with a 3-capture/compare/PWM structure plus an 8-bit timer/counter, a Watchdog Timer with its own on-chip RC oscillator, power-on reset, power-up timer, brown-out reset, and a programmable code-protection scheme. The JW ceramic windowed package is required for prototype development and engineering validation because it allows UV erasure of the EPROM.
Architecturally, the PIC16C771/JW uses a Harvard-class pipelined RISC core with separate program and data buses, allowing an instruction fetch to occur concurrently with operand read. The 12-bit ADC is a successive-approximation converter with internal sample-and-hold, supporting both single-ended and differential inputs, and selectable reference voltages from VDD or an external pin, which lets designers optimize the dynamic range for low-level sensor signals.
Typical applications include industrial process control, precision analog signal acquisition, instrumentation front-ends, sensor-conditioning firmware, and low-cost data loggers. The combination of 12-bit ADC, USART, and PWM makes the part a single-chip solution for closed-loop motor control, smart sensor modules, and battery monitoring circuits where deterministic 8-bit execution is sufficient.
When designing with the PIC16C771/JW, note that the JW (ceramic windowed CDIP) package is intended for development only - in production, migrate to a plastic OTP (P) or windowless variant. Operating voltage is 4.0 V to 6.0 V across 0 °C to 70 °C (commercial); the EPROM must be erased with UV light through the window before reprogramming, and code-protect fuses must be set correctly to prevent unintended memory read-out.
This page synthesizes distributor pricing, UV-EPROM-aware design notes, and pin-compatible drop-in alternatives not consolidated on the manufacturer datasheet, providing a single reference for both new designs and legacy EPROM retrofits.
Bộ thay thế dễ dàng lắp đặt cho PIC16C771/JW — 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 PIC16C771/JW (cùng hình factor và footprint) — khác nhau ở Package, Program Memory Size, Program Memory Type, I/O Pins, Timers.
PIC16C770-I/P
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C717/JW
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C715/JW
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C712/JW
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C711/JW
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C771/JW Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16 mid-range 8-bit RISC |
| Instruction Set | 35 single-word instructions |
| Instruction Cycle Time | 200 ns at 20 MHz |
| Tần số xung maksimum | 20 MHz |
| Program Memory Type | UV-erasable EPROM (windowed CDIP) |
| Program Memory Size | 7 KB (4K x 14 words) |
| Data RAM | 256 bytes |
| Data EEPROM | 256 bytes |
| ADC Channels | 6 (single-ended/differential) |
| ADC Resolution | 12-bit successive approximation |
| I/O Pins | 16 (approx.) |
| Timers | 1x 16-bit (CCP) + 1x 8-bit |
| Capture/Compare/PWM | Yes, 16-bit |
| Serial Interface | USART/SCI (synchronous + asynchronous) |
| Operating Voltage (Vdd) | 4.0 V to 6.0 V |
| Operating Temperature (Commercial) | 0 °C to 70 °C |
| Hộp | 20-pin CDIP (JW, ceramic windowed) |
| Kiểu lắp đặt | Through-Hole |
| Code Protection | Programmable |
| Brown-Out Reset / Power-On Reset | Yes |
| Watchdog Timer | Yes, dedicated on-chip RC oscillator |
Cấu hình chân PIC16C771/JW
| Chân 1 | RA2/AN2/VREF- — PORTA bit 2 / ADC channel 2 / ADC negative reference input |
| Chân 2 | RA3/AN3/VREF+ — PORTA bit 3 / ADC channel 3 / ADC positive reference input |
| Chân 3 | RA4/AN4/T0CKI — PORTA bit 4 / ADC channel 4 / Timer0 clock input |
| Chân 4 | RA5/AN5/SS — PORTA bit 5 / ADC channel 5 / SPI slave select |
| Chân 5 | VSS — Ground reference |
| Chân 6 | RB0/INT — PORTB bit 0 / external interrupt input |
| Chân 7 | RB1 — PORTB bit 1 |
| Chân 8 | RB2 — PORTB bit 2 |
| Chân 9 | RB3/CCP1 — PORTB bit 3 / Capture-Compare-PWM channel 1 |
| Chân 10 | RB4 — PORTB bit 4 |
| Chân 11 | RB5 — PORTB bit 5 |
| Chân 12 | RB6/PGC — PORTB bit 6 / In-circuit serial programming clock |
| Chân 13 | RB7/PGD — PORTB bit 7 / In-circuit serial programming data |
| Chân 14 | VSS — Ground reference (secondary) |
| Chân 15 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Chân 16 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Chân 17 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Chân 18 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP channel 2 |
| Chân 19 | RC2/CCP1 — PORTC bit 2 / CCP1 alternate output |
| Chân 20 | VDD — Positive supply voltage (4.0 V to 6.0 V) |
Ứng dụng tiêu biểu
PIC16C771/JW phù hợp cho 7 Áp dụngs: Precision Analog Signal Acquisition, Industrial Process Control, Sensor Conditioning Firmware Modules, Low-Cost Data Logger, Closed-Loop Motor Speed Control, Battery Monitoring Circuit, Instrumentation Front-End.
Precision Analog Signal Acquisition
The PIC16C771/JW's 12-bit ADC with 6 channels is well-matched to precision analog front-ends where 4096 codes of resolution are sufficient to resolve low-level sensor signals without external ADC ICs. According to the manufacturer datasheet, the successive-approximation architecture with internal sample-and-hold and selectable voltage references lets designers optimize dynamic range at signal levels well below 5 V full-scale, while the 200 ns instruction cycle at 20 MHz ensures deterministic sampling windows for industrial control loops.
Được đề xuất
Industrial Process Control
The PIC16C771/JW's 16-bit CCP/PWM, hardware USART, and 12-bit ADC make it a single-chip solution for industrial process-control loops driving valves, heaters, or motor speed references. According to Microchip's PIC16 mid-range Reference Manual DS33023, the PWM resolution combined with 20 MHz instruction throughput supports sub-100 µs control periods, while the brown-out reset and watchdog timer with dedicated RC oscillator provide the supervisory functions required for IEC-61131-style industrial deployments.
Được đề xuất
Sensor Conditioning Firmware Modules
The PIC16C771/JW's combination of 6-channel 12-bit ADC, USART, and PWM is a strong fit for smart sensor modules that digitize analog transducer outputs and transmit calibration-corrected readings over a serial link. According to the manufacturer datasheet, the 256 bytes of data RAM and 256 bytes of EEPROM allow per-sensor calibration constants to be stored in non-volatile memory and applied in firmware, while the EPROM program memory (7 KB) is enough for linearization and digital-filtering routines.
Được đề xuất
Low-Cost Data Logger
The PIC16C771/JW suits low-cost data-logger designs where periodic ADC samples are stored to external EEPROM or transmitted over the USART. According to the manufacturer datasheet, the PIC16C771's 7 KB EPROM easily accommodates a multi-channel logging scheduler with time-stamping, while the 256 bytes of internal data EEPROM provide 100k+ write-cycle non-volatile parameter storage. Brown-out reset and watchdog timer protect against field-power anomalies in remote deployments.
Được đề xuất
Closed-Loop Motor Speed Control
The PIC16C771/JW's 16-bit CCP/PWM and ADC input allow direct closed-loop control of small DC or brushless motors by sensing back-EMF or current and adjusting PWM duty cycle. According to Microchip's mid-range Reference Manual, the 200 ns instruction cycle at 20 MHz enables 10 kHz+ PWM switching with feedback-loop update rates well above audible noise, while the USART accepts encoder inputs or commands from a master controller in distributed servo systems.
Được đề xuất
Battery Monitoring Circuit
The PIC16C771/JW's 12-bit ADC, low-voltage operation to 4.0 V, and EPROM code space suit multi-cell battery-monitoring circuits that measure individual cell voltages and report state-of-charge over a serial link. According to the manufacturer datasheet, the differential-input capability of the ADC allows direct cell-by-cell voltage measurement without external op-amps, while the hardware USART interfaces to a host BMS controller; the JW package is used for firmware bring-up before locking the design to a plastic OTP variant.
Được đề xuất
Instrumentation Front-End
The PIC16C771/JW's 12-bit ADC resolution and PIC16 mid-range processing power make it suitable for laboratory-instrument front-ends that digitize transducer outputs and present them on a local display or serial console. According to the manufacturer datasheet, the 7 KB EPROM supports calibration menus and units-conversion tables, while the PWM and digital I/O can drive LCD contrast, keypads, or status LEDs without external glue logic.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C771/JW — 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 | PIC16C770-I/P | PIC16C717/JW | PIC16C715/JW | PIC16C712/JW | PIC16C711/JW |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-pin CDIP (JW) | 20-pin PDIP (P) | 20-pin CDIP (JW) - same | 20-pin CDIP (JW) - same | 20-pin CDIP (JW) - same | 20-pin CDIP (JW) - same |
| Core | PIC16 mid-range 8-bit | PIC16 mid-range 8-bit - same | PIC16 mid-range 8-bit - same | PIC16 mid-range 8-bit - same | PIC16 mid-range 8-bit - same | PIC16 mid-range 8-bit - same |
| Program Memory | 7 KB EPROM (4K x 14) | 4 KB EPROM (-43%) | 2 KB EPROM (-71%) | 2 KB EPROM (-71%) | 1 KB EPROM (-86%) | 1.75 KB EPROM (-75%) |
| ADC Resolution | 12-bit | 10-bit (-2 bits) | 10-bit (-2 bits) | None | 8-bit (-4 bits) | 8-bit (-4 bits) |
| ADC Channels | 6 | 6 - same | 6 - same | 0 | 4 (-2) | 4 (-2) |
| Max Clock Frequency | 20 MHz | 20 MHz - same | 20 MHz - same | 20 MHz - same | 20 MHz - same | 20 MHz - same |
| USART | Yes | Yes | Yes | No | No | No |
Bảo phân biệt quan trọng
- 12-bit ADC vs 10-bit on most PIC16 mid-range siblings (vsPIC16C770-I/P)
- Largest EPROM in the 20-pin PIC16C71x/77x JW family (vsPIC16C715/JW)
- Full USART/SCI + SPI + I2C peripheral stack (vsPIC16C712/JW)
Ghi chú thiết kế
The JW (ceramic windowed) package is intended for development and prototyping only - in production, migrate to the equivalent plastic OTP package (PIC16C771-I/P) or the flash-based PIC16F777-I/P because ceramic-windowed parts are not cost-effective at volume and have limited availability. The quartz window must remain covered with opaque labels during operation to prevent accidental UV-induced EPROM erasure; ambient sunlight contains enough UV to corrupt unprotected EPROM cells over days of exposure.
Estimated: Vdd must be held between 4.0 V and 6.0 V per the PIC16C771 datasheet; at 20 MHz with all peripherals enabled, supply current is typically 20-25 mA. Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 20) and a bulk 10 µF tantalum or aluminum electrolytic capacitor on the same supply trace to suppress switching transients from the ADC and PWM peripherals. The analog and digital VDD/VSS rails should be tied together at a single star ground to minimize ADC reference noise.
Estimated: When laying out a 20-pin CDIP socket for the PIC16C771/JW, leave at least 3 mm of clearance above the JW window to allow UV erasure-lamp access during development, and avoid placing tall components or shields directly over the window. For oscillator stability, keep the crystal or resonator within 10 mm of pins 15-16 (OSC1/OSC2) and surround the crystal body with a guard ring tied to analog ground to reduce radiated EMI coupling into the ADC inputs.
The 12-bit ADC is sensitive to VREF quality; bypass the VREF+ and VREF- pins (pins 2 and 3 in some pinout variants) with 100 nF ceramic capacitors and a 10 µF tantalum capacitor to provide a low-impedance reference during conversion. According to the PIC16C771 datasheet, acquisition time must be calculated as T_ACQ = 2 µs + (T_CO)(1/2) + (CHOLD)(Ricc)(ln(1/2047)), where CHOLD is approximately 25 pF; failing to honor this minimum acquisition time reduces ADC accuracy.
Thông tin tuân thủ
RoHS, REACH, lead-free, and halogen-free status for the PIC16C771/JW JW ceramic windowed package were not explicitly listed in the distributor data and require verification through Microchip's substance-compliance database; the JW package typically uses ceramic seals that historically fall outside standard RoHS scope. AEC-Q100 is not applicable for this 8-bit CMOS EPROM MCU, which targets industrial/consumer applications rather than automotive.
