PIC16C781T-I/SS - 8-bit MCU 1.75KB OTP 20MHz SSOP-20 | Microchip
부품 번호: PIC16C781T-I/SS ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $4.4298 | $4.43 |
| 10 | $3.95 | $39.50 |
| 100 | $3.42 | $342.00 |
| 500 | $3.05 | $1,525.00 |
| 1,000 | $2.78 | $2,780.00 |
PIC16C781T-I/SS 개요
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/OTP/Flash), data RAM, and peripheral interfaces on one silicon die. PIC microcontrollers use a RISC architecture and a Harvard memory layout, which separates program and data buses for predictable instruction timing - making them widely used in embedded control applications such as sensor signal conditioning, motor control, and human-interface products. The PIC16C781 belongs to Microchip's mid-range PIC16 family, which sits between the baseline PIC10/12/16 and the high-performance PIC18/PIC24 in terms of instruction set and peripheral set.
The device's defining feature is its analog integration: an 8-channel 8-bit A/D converter, an 8-bit D/A converter, two on-chip op-amps, two comparators, and a Programmable Switched Mode Controller (PSMC) for SMPS support. According to Microchip product documentation, this combination allows engineers to build complete analog signal-chain functions - signal amplification, level detection, reference generation, and closed-loop control - around a single MCU without external analog ICs.
The PIC16C781T-I/SS executes instructions at 20 MHz with a 200 ns cycle time, supports in-circuit serial programming (ICSP) via two pins, and offers selectable oscillator modes including internal RC and external crystal. Its 16 I/O pins are 5V-tolerant, with individual direction control and weak pull-up capability. Power-saving features include a SLEEP mode and a watchdog timer with its own on-chip RC oscillator for reliable operation in noisy environments.
Typical applications include sensor signal conditioning, switched-mode power supply (SMPS) control via the integrated PSMC, closed-loop PID control using the on-chip op-amps and comparators, automotive sensor interfaces, and industrial instrumentation. The OTP program memory suits low-to-medium volume production where mask-ROM volumes are not justified.
When designing with this part, ensure the ICSP pins (RB6/RB7) are accessible on the PCB for in-system programming and debug. Decouple VDD/VSS with a 100 nF ceramic capacitor placed as close to the pins as possible, and reserve the MCLR pin for the standard reset pull-up network. The PSMC peripheral requires careful MOSFET gate-drive layout to avoid injecting switching noise into the analog op-amp inputs.
This page synthesizes distributor pricing, drop-in same-family alternatives, comparison data, and practical design notes not found in the manufacturer datasheet alone, providing an engineer-ready reference for selecting the PIC16C781T-I/SS in mixed-signal embedded designs.
드롭인 대체품: PIC16C781T-I/SS — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: PIC16C781T-I/SS (동일 폼 팩터 및 풋프린트) — 차이점: Package, Core Architecture, Data RAM, ADC, Data EEPROM.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
PIC16C781-I/SS
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
PIC16C781T-I/SO
✅ 드롭인✓ 재고 있음
$5.85 / 개
데이터시트 보기 →PIC16F88-I/SS
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$3.08 / 개
데이터시트 보기 →PIC16F1827T-I/SS
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$0.95 / 개
데이터시트 보기 →PIC16F15344T-I/SS
✅ 드롭인✓ 재고 있음
$0.72 / 개
데이터시트 보기 →PIC16C781T-I/SS 최대 정격 & 전기적 특성
| Core Architecture | PIC Mid-Range 8-bit RISC (Harvard) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 1.75 KB (1K x 14 words) |
| Data RAM | 128 bytes |
| Data EEPROM | 0 bytes (none on this part) |
| Maximum CPU Speed | 20 MHz |
| Instruction Cycle Time | 200 ns |
| I/O Pins | 16 |
| A/D Converter | 8-channel, 8-bit |
| D/A Converter | 1-channel, 8-bit |
| On-chip Op-Amps | 2 |
| Comparators | 2 |
| PSMC Module | Yes (Programmable Switched Mode Controller) |
| 패키지 | 20-pin SSOP (5.30 mm body) |
| 동작 온도 | -40C to +85C (Industrial) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
PIC16C781T-I/SS 핀 구성
| 핀 1 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| 핀 2 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| 핀 3 | RA2/AN2/VREF- — PORTA bit 2 / Analog input channel 2 / DAC reference negative |
| 핀 4 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input channel 3 / DAC reference positive |
| 핀 5 | RA4/AN4/T0CKI — PORTA bit 4 / Analog input channel 4 / Timer0 clock input |
| 핀 6 | RA5/AN5 — PORTA bit 5 / Analog input channel 5 |
| 핀 7 | RA6/OSC2/CLKO — PORTA bit 6 / Oscillator crystal output / Clock output |
| 핀 8 | RA7/OSC1/CLKI — PORTA bit 7 / Oscillator crystal input / Clock input |
| 핀 9 | VSS — Ground reference |
| 핀 10 | RB0/INT — PORTB bit 0 / External interrupt input |
| 핀 11 | RB1 — PORTB bit 1 |
| 핀 12 | RB2 — PORTB bit 2 |
| 핀 13 | RB3/PGM — PORTB bit 3 / Low-voltage programming enable |
| 핀 14 | RB4 — PORTB bit 4 |
| 핀 15 | RB5 — PORTB bit 5 |
| 핀 16 | RB6/PGC — PORTB bit 6 / In-circuit debugger clock |
| 핀 17 | RB7/PGD — PORTB bit 7 / In-circuit debugger data |
| 핀 18 | VDD — Positive supply voltage |
| 핀 19 | MCLR/VPP — Master clear reset input / Programming voltage |
| 핀 20 | NC — Not connected (per datasheet package pinout) |
일반적인 애플리케이션
PIC16C781T-I/SS 적합 용도: 7 애플리케이션s: Sensor Signal Conditioning, Switched-Mode Power Supply (SMPS) Control, Closed-Loop PID Motor Control, Industrial Instrumentation Front-End, LED Lighting Color and Brightness Control, Automotive Sensor Interface Module, Battery Charger Controller.
Sensor Signal Conditioning
The PIC16C781T-I/SS is ideally suited for sensor signal conditioning front-ends because it integrates two on-chip op-amps, two analog comparators, an 8-channel 8-bit ADC, and an 8-bit DAC in a single 20-SSOP device. According to the Microchip datasheet, the op-amps can be configured as inverting, non-inverting, or differential gain stages to amplify low-level bridge, thermocouple, or photodiode signals up to the ADC's input range. The on-chip comparators provide fast threshold detection for alarm or interrupt generation without burdening the CPU, while the 8-bit DAC generates programmable bias voltages or excitation levels for ratiometric sensors. At 20 MHz the CPU can sample and process sensor data at rates suitable for industrial control loops. This eliminates the external analog IC that a typical PIC16 design would otherwise require, reducing BOM cost and PCB area by up to 30% in mixed-signal sensor modules.
추천
Switched-Mode Power Supply (SMPS) Control
The PIC16C781T-I/SS contains Microchip's Programmable Switched Mode Controller (PSMC) peripheral, which provides dedicated hardware for controlling non-isolated DC-DC converter topologies such as buck, boost, buck-boost, and flyback. Per the datasheet, the PSMC supports programmable switching frequency, dead-band control, current-mode or voltage-mode operation, and complementary outputs with adjustable phase shift, which are essential for synchronous rectifier drive. The two on-chip op-amps can be re-purposed as the current-sense amplifier and error amplifier of a closed-loop SMPS, while the on-chip comparator provides cycle-by-cycle current limiting. The 200 ns instruction cycle and 20 MIPS performance allow digital slope compensation, soft-start, and adaptive voltage positioning to be implemented in firmware. This integration makes the PIC16C781T-I/SS a cost-effective single-chip digital controller for sub-50 W point-of-load converters in distributed power architectures.
추천
Closed-Loop PID Motor Control
The PIC16C781T-I/SS can act as a single-chip PID controller for small brushed DC or low-power brushless DC motors, using its on-chip op-amps for current sensing and signal conditioning and its 8-bit ADC for speed/position feedback. According to the datasheet, the 16 digital I/O pins provide PWM generation, direction control, encoder input, and fault handling, while the 128 bytes of RAM and 1.75 KB OTP program memory are sufficient for fixed-point PID control loops with modest update rates. The 20 MHz CPU runs the control loop at 200 ns per instruction, supporting loop rates up to several kHz with simple PID math. The two comparators can be wired as over-current and over-temperature hardware fault comparators that shut down the PWM outputs without software intervention, improving safety. This makes the part well suited for low-cost appliance motor control, valve actuators, and small fan control where BOM cost is paramount.
추천
Industrial Instrumentation Front-End
The PIC16C781T-I/SS serves as an industrial analog front-end processor, multiplexing up to 8 analog sensor channels through its on-chip 8-bit ADC and providing local processing, linearization, and digital communication. Per the Microchip datasheet, the industrial temperature grade (-40C to +85C) supports factory floor and outdoor cabinet deployment. The on-chip DAC allows programmable excitation for ratiometric sensors such as strain gauges and RTDs, while the op-amps buffer and amplify low-level outputs before digitization. The USART peripheral provides RS-232/RS-485 connectivity to a host controller or HMI, and the I2C/SPI peripherals allow direct connection to digital sensors and EEPROMs. At 20 MIPS, the part can sample multiple channels, apply calibration coefficients, and format protocol messages in real time. The SSOP-20 footprint allows this functionality to fit on small sensor-interface PCBs.
추천
LED Lighting Color and Brightness Control
The PIC16C781T-I/SS can drive multi-channel LED lighting systems for architectural, automotive interior, or signage applications, using its 8-bit DAC and PWM outputs to independently control color-mixing RGB or RGBA LED strings. According to the datasheet, the on-chip op-amps can serve as constant-current driver feedback amplifiers, while the two comparators provide LED open/short detection that protects the driver hardware. The 8-bit resolution is adequate for typical lighting dimming curves, and the 200 ns instruction cycle supports fast refresh rates that avoid visible flicker even with multiple channels. The 128 bytes of RAM store color presets and fade tables, and the 1.75 KB OTP holds the color-space conversion (RGB to CIE 1931) and temperature compensation routines. The SSOP-20 industrial temperature range supports both indoor and outdoor luminaires.
추천
Automotive Sensor Interface Module
The PIC16C781T-I/SS is well suited as a low-cost automotive sensor interface, multiplexing temperature, pressure, and position sensors through its on-chip ADC and providing a LIN or CAN-friendly digital output. Per the datasheet, the integrated op-amps amplify low-level sensor outputs (e.g., 0-100 mV pressure sensors) to the ADC's input range, while the on-chip DAC provides offset adjustment or sensor excitation. Note: this part is specified for -40C to +85C (industrial grade), so it cannot be used under-hood where -40C to +125C (AEC-Q100 grade 0/1) is required; for under-hood use select a Q-graded PIC16 variant instead. The 16 digital I/O pins drive status LEDs, wake-up inputs, and LIN bus transceivers. The OTP program memory provides cost-effective deployment in high-volume vehicle options packages, and the SSOP-20 footprint fits small remote sensor housings.
추천
Battery Charger Controller
The PIC16C781T-I/SS can function as a closed-loop charger controller for lead-acid, NiMH, or single-cell Li-ion battery packs, using its on-chip ADC to monitor battery voltage and current, and its on-chip DAC to program the charging voltage reference. According to the Microchip datasheet, the two op-amps can be configured as a current-sense amplifier and an error amplifier that drives the PSMC's PWM outputs through external MOSFETs, implementing a complete CC/CV (constant current / constant voltage) charger with digital termination logic. The two comparators provide hardware-level over-voltage and over-current protection that disables the PWM outputs without software latency. The 1.75 KB OTP stores the multi-stage charging profile, while the 128 bytes of RAM handle runtime state tracking. The 20 MIPS performance enables adaptive charging algorithms such as temperature-compensated float voltage and pulse maintenance charging.
추천
추천 제품 요약
엔지니어링 참조 데이터: PIC16C781T-I/SS — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | PIC16C781-I/SS | PIC16F88-I/SS | PIC16F1827T-I/SS | PIC16F15344T-I/SS |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP | 4 KB Flash | 7 KB Flash | 7 KB Flash |
| Data RAM | 128 bytes | 128 bytes | 368 bytes | 384 bytes | 512 bytes |
| Maximum CPU Speed | 20 MHz | 20 MHz | 20 MHz | 32 MHz (8 MIPS) | 32 MHz (8 MIPS) |
| ADC | 8-ch, 8-bit | 8-ch, 8-bit | 7-ch, 10-bit | 12-ch, 10-bit | 17-ch, 10-bit |
| On-chip Op-Amps | 2 | 2 | 0 | 0 | 0 |
| Comparators | 2 | 2 | 2 | 2 | 2 |
| PSMC Module | Yes | Yes | No | No (has PWM + CWG) | No (has PWM + CWG + NCO) |
| D/A Converter | 1-ch, 8-bit | 1-ch, 8-bit | None | None | 1-ch, 5-bit (DAC ref) |
주요 차별점
- On-chip analog integration (vs PIC16F88-I/SS)
- PSMC SMPS controller (vs PIC16F1827T-I/SS)
- Same SSOP-20 footprint as Flash-based upgrades (vs PIC16C781T-I/SO)
- Industrial temperature range (vs PIC16C781T-I/SO)
설계 노트
Decouple VDD (pin 18) and VSS (pin 9) with a 100 nF X7R ceramic capacitor placed within 5 mm of the pins, and add a bulk 1-10 uF tantalum or ceramic capacitor near the supply rail. The PIC16C781T-I/SS's analog peripherals (ADC, DAC, op-amps, comparators) are sensitive to VDD noise; route digital signals away from the analog pins and consider a guard ring around analog traces tied to analog ground. Per Microchip application note AN546, separate analog and digital ground planes are recommended and joined at a single point near the VSS pin.
When using the PSMC peripheral for SMPS control, keep the high-current switching traces short and away from the analog op-amp inputs. The on-chip op-amps have limited GBW and slew rate, so they cannot directly drive MOSFET gates at high frequency - use an external gate driver such as the TC4420 or MCP14E3 for switching currents above 100 mA. Failure to do so results in excessive shoot-through and efficiency loss. Also ensure the MCLR/VPP pin (pin 19) has a 10 kohm pull-up to VDD; floating MCLR causes spurious resets, especially in noisy SMPS environments.
For ICSP (in-circuit serial programming), keep the RB6/PGC (pin 16) and RB7/PGD (pin 17) traces short and free of series resistors above 1 kohm to ensure reliable programming. According to Microchip programming specification DS30277, the PGC/PGD lines should not be loaded by capacitance greater than 50 pF total. Reserve a 6-pin header on the PCB for the ICSP programmer connection, even on production units, to allow field firmware updates for OTP parts (a one-time programming opportunity).
Estimated: at 20 MHz with all peripherals active, the PIC16C781T-I/SS draws approximately 10-15 mA from VDD (per datasheet typical values). For battery-powered designs, use SLEEP mode between sensor reads and gate the op-amp power via a GPIO to reduce quiescent current below 1 uA. Add a small bulk capacitor (>= 10 uF) on VDD to handle inrush when the part wakes from SLEEP and the ADC reference stabilizes. Verify the final power budget by measuring the actual current with the production firmware, since OTP firmware cannot be patched.
The PIC16C781T-I/SS in 20-SSOP has a thermal resistance (theta_JA) of approximately 100-120 C/W. At maximum VDD and 20 MHz with all peripherals enabled, the part dissipates well under 100 mW, keeping junction temperature rise below 12C above ambient. No heatsinking is required for industrial-temperature operation. However, in enclosed outdoor enclosures with high ambient temperatures, verify the worst-case junction temperature using theta_JA and the actual power dissipation to ensure margin against the +85C limit.
규정 준수 정보
RoHS and lead-free confirmed per Microchip product documentation and DigiKey/Mouser distributor listings. Industrial temperature grade only (-40C to +85C); not AEC-Q100 qualified - select an automotive-grade PIC16 variant for under-hood automotive use. Halogen-free per Microchip material declaration.
