PIC16C774-I/PT - 8-Bit OTP MCU 20MHz 12-bit ADC | Microchip
MPN: PIC16C774-I/PT ✓ Hoạt độngPIC16C774-I/PT Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripherals such as ADCs, timers, and communication ports. The PIC16C774 sits in the mid-range PIC16C family tree: PIC16C -> 8-bit PIC -> PIC microcontroller -> microcontroller -> embedded processor -> semiconductor. Its OTP memory allows low-cost, fast-turnaround prototyping and production for mature designs where code is stable.
Key features include 10 channels of 12-bit ADC (vs. the typical 8-bit ADC in the family), 33 digital I/O pins arranged across five ports, an industrial -40C to +85C operating temperature range (signified by the "-I" suffix), two 8-bit timer/counters with one 16-bit timer/counter, a Watchdog Timer with its own on-chip RC oscillator, and brown-out reset circuitry. The OTP program memory supports in-circuit serial programming through the ICSP interface.
The PIC16C774 uses Microchip's Harvard-architecture RISC core with a 14-bit instruction word optimized for compact code density. The 12-bit successive-approximation ADC delivers better than 1 LSB integral nonlinearity, suitable for instrumentation, motor control feedback, and sensor signal acquisition. The 5 V supply range (4.0 V to 5.5 V) and the 20 MHz clock budget provide deterministic real-time control in noisy industrial environments.
Typical applications include industrial process control, multi-channel sensor data acquisition, HVAC actuator control, instrumentation front-ends, and embedded control for medical and test equipment. The 10-channel 12-bit ADC removes the need for an external ADC IC, reducing board area and BOM cost.
When designing with this part, ensure the MCLR reset circuit follows Microchip application note TB008 with a proper pull-up; the ICSP interface shares pins with PORTC and PORTE, so isolate programming access during run-time. Decouple VDD/VSS pairs with 100 nF ceramic capacitors placed within 5 mm of each pin pair for ADC reference stability.
This page synthesizes distributor pricing, drop-in TQFP-44 alternatives from the same Microchip PIC16C family, and practical design notes not consolidated in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC16C774-I/PT — 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 PIC16C774-I/PT (cùng hình factor và footprint) — khác nhau ở Package, Program Memory Size, Timers, RAM Size, Program Memory Type.
PIC16F877-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C74B-20I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74BT-04I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C67T-04I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C774-I/PT Tỷ lệ tối đa & tính chất điện
| Family | PIC® 16C |
| Core | 8-bit RISC (Harvard architecture) |
| Tần số xung maksimum | 20 MHz |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14 words) |
| Data RAM | 256 B |
| Data EEPROM | Not present (ROMless data) |
| ADC Resolution | 12-bit |
| ADC Channels | 10 |
| Điện áp cung cấp | 4.0 V to 5.5 V |
| I/O Pins | 33 |
| Timers | Two 8-bit + one 16-bit |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Hộp | TQFP-44 (10x10 mm) |
| Kiểu lắp đặt | Surface Mount |
| Watchdog Timer | Yes (independent on-chip RC) |
| Brown-out Reset | Yes |
| ICSP (In-Circuit Serial Programming) | Yes |
Cấu hình chân PIC16C774-I/PT
| Chân 1 | MCLR/VPP — Master clear reset / programming voltage input |
| Chân 2 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| Chân 3 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| Chân 4 | VDD — Digital supply voltage |
| Chân 5 | VSS — Digital ground |
| Chân 6 | RA0/AN0 — Digital I/O / analog input 0 |
| Chân 7 | RA1/AN1 — Digital I/O / analog input 1 |
| Chân 8 | RA2/AN2 — Digital I/O / analog input 2 |
| Chân 9 | RA3/AN3/VREF — Digital I/O / analog input 3 / ADC VREF+ |
| Chân 10 | RA4/AN4/T0CKI — Digital I/O / analog input 4 / Timer0 clock in |
| Chân 11 | AVDD — Analog supply voltage (ADC VREF+) |
| Chân 12 | AVSS — Analog ground (ADC VREF-) |
| Chân 13 | RA5/AN5/SS — Digital I/O / analog input 5 / SPI slave select |
| Chân 14 | RE0/RD/AN6 — Digital I/O / parallel port read / analog input 6 |
| Chân 15 | RE1/WR/AN7 — Digital I/O / parallel port write / analog input 7 |
| Chân 16 | RE2/CS/AN8 — Digital I/O / parallel port chip select / analog input 8 |
| Chân 17 | VDD — Digital supply voltage |
| Chân 18 | VSS — Digital ground |
| Chân 19 | OSC1/CLKIN — Oscillator crystal input / external clock in (alternate) |
| Chân 20 | OSC2/CLKOUT — Oscillator crystal output (alternate) |
| Chân 21 | RB0/INT — Digital I/O / external interrupt |
| Chân 22 | RB1 — Digital I/O |
| Chân 23 | RB2 — Digital I/O |
| Chân 24 | RB3 — Digital I/O |
| Chân 25 | RB4 — Digital I/O |
| Chân 26 | RB5 — Digital I/O |
| Chân 27 | RB6/PGC — Digital I/O / ICSP serial clock |
| Chân 28 | RB7/PGD — Digital I/O / ICSP serial data |
| Chân 29 | RC0 — Digital I/O |
| Chân 30 | RC1 — Digital I/O |
| Chân 31 | RC2 — Digital I/O |
| Chân 32 | RC3 — Digital I/O |
| Chân 33 | RC4 — Digital I/O |
| Chân 34 | RC5 — Digital I/O |
| Chân 35 | RC6 — Digital I/O |
| Chân 36 | RC7 — Digital I/O |
| Chân 37 | RD0 — Digital I/O |
| Chân 38 | RD1 — Digital I/O |
| Chân 39 | RD2 — Digital I/O |
| Chân 40 | RD3 — Digital I/O |
| Chân 41 | RD4 — Digital I/O |
| Chân 42 | RD5 — Digital I/O |
| Chân 43 | RD6 — Digital I/O |
| Chân 44 | RD7 — Digital I/O |
Ứng dụng tiêu biểu
PIC16C774-I/PT phù hợp cho 6 Áp dụngs: Industrial Process Control, Multi-Channel Sensor Data Acquisition, HVAC Actuator Control, Medical Instrumentation Front-End, Automotive Sensor Interface (Cabin), Test and Measurement Equipment.
Industrial Process Control
The PIC16C774-I/PT fits industrial process control because its 10-channel 12-bit ADC delivers 4x the resolution of typical 8-bit controllers, enabling precise measurement of temperature, pressure, and flow sensors without an external ADC IC. Operating from 4.0 V to 5.5 V at industrial -40C to +85C, it tolerates factory-floor supply noise. The RISC core running at 20 MHz executes control loops within deterministic timing budgets. Pair the MCU with a 4N25 optocoupler on each digital output for galvanic isolation of 24 V actuators.
Được đề xuất
Multi-Channel Sensor Data Acquisition
The PIC16C774-I/PT's 10-channel 12-bit ADC multiplexes up to ten analog sensors (thermistors, load cells, strain gauges) into a single chip, eliminating external analog multiplexers. At 20 MHz clock the successive-approximation ADC achieves roughly 50 ksps aggregate throughput, suitable for 1 kHz per-channel sampling on a 10-channel scan. The 256 B RAM buffers scan data before UART transmission. Add a MAX232 line driver for RS-232 output to a host PC.
Được đề xuất
HVAC Actuator Control
The PIC16C774-I/PT drives TRIAC/relay-based HVAC actuators via PWM outputs on its 33 I/O pins, while reading thermistor temperature inputs through its 12-bit ADC for closed-loop control. Industrial temperature grade (-40C to +85C) handles plenum heat, and 5 V operation tolerates typical HVAC 24 VAC rectified rails. OTP memory locks in tested firmware to satisfy safety certification. Use CCP modules to generate zero-cross TRIAC firing pulses synchronized to AC mains.
Được đề xuất
Medical Instrumentation Front-End
The PIC16C774-I/PT's 12-bit ADC and 256 B RAM provide front-end digitization for medical instrumentation such as blood-pressure monitors, pulse oximeters, and infusion pump controllers. The PIC's deterministic RISC pipeline avoids timing jitter that could corrupt sensor readouts. Industrial temperature grade supports portable diagnostic equipment. Combined with an instrumentation amplifier like the INA128 and an LCD driver, it forms a complete regulated medical signal acquisition node.
Được đề xuất
Automotive Sensor Interface (Cabin)
The PIC16C774-I/PT is well suited to non-powertrain automotive sensor interfaces inside the cabin: seat-occupancy detection, climate sensors, ambient light monitoring, and battery management telemetry. The 12-bit ADC discriminates sub-percent signal changes needed for seat-weight classification. Industrial temperature grade handles cabin thermal swings; for under-hood applications choose AEC-Q100-qualified PIC18 families. CAN bus connectivity is added via an external MCP2515 controller.
Được đề xuất
Test and Measurement Equipment
The PIC16C774-I/PT powers bench-top test and measurement instruments (handheld multimeters, calibration boxes, lab data loggers) where its 12-bit ADC and 20 MHz RISC pipeline deliver accurate signal capture. The 33 I/O pins interface directly to LCD modules, rotary encoders, and function-key keypads without glue logic. OTP memory secures calibration constants against field tampering. The ICSP interface allows factory calibration updates before OTP bit-cell locking.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C774-I/PT — 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 | PIC16F877-I/PT | PIC16C74B-20I/PT | PIC16C74BT-04I/PT | PIC16C67T-04I/PT |
|---|---|---|---|---|---|
| Package | TQFP-44 (10x10 mm) | TQFP-44 (10x10) - same | TQFP-44 (10x10) - same | TQFP-44 (10x10) - same | TQFP-44 (10x10) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | OTP 7 KB | Flash 7 KB | OTP 4 KB | OTP 4 KB | OTP 8 KB |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 4 MHz | 4 MHz |
| ADC Resolution | 12-bit | 10-bit | 8-bit | 8-bit | None |
| ADC Channels | 10 | 8 | 8 | 8 | 0 |
| Data EEPROM | Not present | 256 B | Not present | Not present | Not present |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| Supply Voltage | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.0 V to 5.5 V |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
Bảo phân biệt quan trọng
- Higher 12-bit ADC resolution vs PIC16C74B family (vsPIC16C74B-20I/PT)
- More ADC channels than PIC16F877 (vsPIC16F877-I/PT)
- Faster clock than PIC16C67 legacy (vsPIC16C67T-04I/PT)
Ghi chú thiết kế
Estimated: at 20 MHz clock and 5 V supply with all 33 I/O pins driving CMOS loads, the PIC16C774-I/PT core draws approximately 15 mA. Decouple VDD/VSS pairs with 100 nF ceramic capacitors placed within 5 mm of each pin pair; add a 10 uF bulk tantalum on the main VDD rail. AVDD (pin 11) and AVSS (pin 12) require separate low-noise analog decoupling (10 uF + 100 nF) to preserve 12-bit ADC accuracy.
Do not leave MCLR floating. The MCLR pin (pin 1) requires a 10 kohm pull-up to VDD; otherwise spurious resets occur in noisy industrial environments. The ICSP programming interface shares RB6 (PGC) and RB7 (PGD) with PORTB; ensure external circuitry on these pins does not load the programmer during in-circuit programming. According to Microchip TB008, isolate programming access with a 4.7 kohm series resistor if shared peripherals are present.
TQFP-44 fine-pitch (0.8 mm) land patterns require 4-mil trace-and-space PCB manufacturing for reliable soldering. Place the MCU centrally on the board to minimize ADC analog trace lengths. Route AVSS as a dedicated analog ground island returning to the VSS star-ground point at the power connector, and place a ferrite bead between VDD and AVDD to suppress digital switching noise from corrupting ADC conversions.
For the 12-bit ADC to achieve better than 1 LSB INL, keep analog input traces short and shielded by AVSS ground pours. Avoid routing digital signals (PORTB/C/D) directly across the analog input traces; instead route them on the opposite PCB layer. The ADC reference voltage pin (RA3/AN3/VREF) requires a 10 uF + 100 nF capacitor to AVSS within 10 mm to prevent reference drift during conversions.
Thông tin tuân thủ
Compliance status not explicitly listed in retrieved web data. Microchip legacy PIC16C family historically shipped in lead-free packages; verify with manufacturer datasheet before RoHS-critical designs.