PIC16C774-I/PT - 8-Bit OTP MCU 20MHz 12-bit ADC | Microchip
MPN： PIC16C774-I/PT ✓ 啟用中PIC16C774-I/PT 概覽
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.
直接替換替代品，適用於 PIC16C774-I/PT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC16C774-I/PT （相同外形與佔位） — 差異在於 Package, Program Memory Size, Timers, RAM Size, Program Memory Type.
PIC16F877-I/PT
✅ 直接替換📋 參考替代品（不在目錄中）
PIC16C74B-20I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC16C74BT-04I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC16C67T-04I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC16C774-I/PT 最大額定值與電氣特性
| Family | PIC® 16C |
| Core | 8-bit RISC (Harvard architecture) |
| 最大時脈頻率 | 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 |
| 供應電壓 | 4.0 V to 5.5 V |
| I/O Pins | 33 |
| Timers | Two 8-bit + one 16-bit |
| 工作溫度 | -40C to +85C (Industrial) |
| 封裝 | TQFP-44 (10x10 mm) |
| 安裝類型 | Surface Mount |
| Watchdog Timer | Yes (independent on-chip RC) |
| Brown-out Reset | Yes |
| ICSP (In-Circuit Serial Programming) | Yes |
PIC16C774-I/PT 腳位配置
| 腳位 1 | MCLR/VPP — Master clear reset / programming voltage input |
| 腳位 2 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| 腳位 3 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| 腳位 4 | VDD — Digital supply voltage |
| 腳位 5 | VSS — Digital ground |
| 腳位 6 | RA0/AN0 — Digital I/O / analog input 0 |
| 腳位 7 | RA1/AN1 — Digital I/O / analog input 1 |
| 腳位 8 | RA2/AN2 — Digital I/O / analog input 2 |
| 腳位 9 | RA3/AN3/VREF — Digital I/O / analog input 3 / ADC VREF+ |
| 腳位 10 | RA4/AN4/T0CKI — Digital I/O / analog input 4 / Timer0 clock in |
| 腳位 11 | AVDD — Analog supply voltage (ADC VREF+) |
| 腳位 12 | AVSS — Analog ground (ADC VREF-) |
| 腳位 13 | RA5/AN5/SS — Digital I/O / analog input 5 / SPI slave select |
| 腳位 14 | RE0/RD/AN6 — Digital I/O / parallel port read / analog input 6 |
| 腳位 15 | RE1/WR/AN7 — Digital I/O / parallel port write / analog input 7 |
| 腳位 16 | RE2/CS/AN8 — Digital I/O / parallel port chip select / analog input 8 |
| 腳位 17 | VDD — Digital supply voltage |
| 腳位 18 | VSS — Digital ground |
| 腳位 19 | OSC1/CLKIN — Oscillator crystal input / external clock in (alternate) |
| 腳位 20 | OSC2/CLKOUT — Oscillator crystal output (alternate) |
| 腳位 21 | RB0/INT — Digital I/O / external interrupt |
| 腳位 22 | RB1 — Digital I/O |
| 腳位 23 | RB2 — Digital I/O |
| 腳位 24 | RB3 — Digital I/O |
| 腳位 25 | RB4 — Digital I/O |
| 腳位 26 | RB5 — Digital I/O |
| 腳位 27 | RB6/PGC — Digital I/O / ICSP serial clock |
| 腳位 28 | RB7/PGD — Digital I/O / ICSP serial data |
| 腳位 29 | RC0 — Digital I/O |
| 腳位 30 | RC1 — Digital I/O |
| 腳位 31 | RC2 — Digital I/O |
| 腳位 32 | RC3 — Digital I/O |
| 腳位 33 | RC4 — Digital I/O |
| 腳位 34 | RC5 — Digital I/O |
| 腳位 35 | RC6 — Digital I/O |
| 腳位 36 | RC7 — Digital I/O |
| 腳位 37 | RD0 — Digital I/O |
| 腳位 38 | RD1 — Digital I/O |
| 腳位 39 | RD2 — Digital I/O |
| 腳位 40 | RD3 — Digital I/O |
| 腳位 41 | RD4 — Digital I/O |
| 腳位 42 | RD5 — Digital I/O |
| 腳位 43 | RD6 — Digital I/O |
| 腳位 44 | RD7 — Digital I/O |
典型應用
PIC16C774-I/PT 適用於 6 應用s: 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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 PIC16C774-I/PT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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) |
主要差異化特點
- Higher 12-bit ADC resolution vs PIC16C74B family (對比PIC16C74B-20I/PT)
- More ADC channels than PIC16F877 (對比PIC16F877-I/PT)
- Faster clock than PIC16C67 legacy (對比PIC16C67T-04I/PT)
設計說明
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.
合規資訊
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.