PIC16C781-I/SO - 8-bit MCU 1.75KB OTP 20MHz 20-SOIC | Microchip
部品番号: PIC16C781-I/SO ⚠ ラストタイムバイ| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $3.68 | $3.68 |
| 10 | $3.4 | $34.00 |
| 100 | $2.98 | $298.00 |
| 500 | $2.62 | $1,310.00 |
| 1,000 | $2.35 | $2,350.00 |
PIC16C781-I/SO 概要
An OTP microcontroller is a microcontroller whose program memory is written once (by the user or factory) and is non-erasable. OTP devices sit between the development-friendly Flash MCUs and the higher-cost, factory-masked ROM MCUs in Microchip's product hierarchy, making them attractive for low-to-medium volume production where the cost-per-unit advantage over Flash is significant but full ROM mask NRE is not justified. The PIC16C781 is a member of Microchip's PIC16 mid-range 8-bit core family and uses a 14-bit instruction word.
Key on-chip features include 1.75 KB OTP program memory, 128 bytes of data RAM, 16 digital I/O pins with individual direction control, an 8-channel 8-bit A/D converter, an 8-bit D/A output, a single on-chip op-amp, two analog comparators, a PSMC (Programmable Switch-Mode Controller) module for direct power-supply regulation, an 8-bit timer/counter (TMR0), a 16-bit timer/counter (TMR1), and a Watchdog Timer with its own on-chip RC oscillator for maximum reliability. The PSMC makes the PIC16C781 particularly distinctive: it allows the MCU to directly implement closed-loop control of switching power supplies without an external PWM controller IC.
Typical applications include SMPS (switch-mode power supply) primary-side control, battery chargers, LED drivers, fan/motor speed controllers, and any 5V system that needs on-board analog signal conditioning plus 8-bit digital control. The integrated op-amp and comparators let the designer build current-sense amplifiers and feedback loops around the core without external analog ICs.
When designing with this part, note that OTP memory cannot be reprogrammed in-circuit; firmware must be programmed before or during board assembly using a Microchip device programmer. The PSMC peripheral requires careful PWM dead-time and frequency programming to avoid shoot-through in the external FET bridge. Industrial-temperature range is denoted by the "I" suffix.
ドロップイン代替品: PIC16C781-I/SO — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: PIC16C781-I/SO （同一形状・フットプリント） — 相違点: Operating Temperature, Package, ADC, I/O Pins, Timers.
クイック比較ツール — 並列比較する代替部品を選択:
PIC16C781T-I/SO
✅ ドロップイン✓ 在庫あり
$5.85 / 個
データシートを見る →PIC16F785-I/SO
✅ ドロップイン✓ 在庫あり
$1.45 / 個
データシートを見る →PIC16C782-I/SO
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
PIC16F882-I/SO
✅ ドロップイン✓ 在庫あり
$1.48 / 個
データシートを見る →PIC16C711-20I/SO
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$1.95 / 個
データシートを見る →PIC16C716-I/SO
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
PIC16C781-I/SO 最大定格＆電気的特性
| Core Architecture | PIC16 mid-range 8-bit RISC |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 1.75 KB (1K x 14) |
| Data RAM | 128 bytes |
| 最大クロック周波数 | 20 MHz |
| 電源電圧 | 2.0 V to 5.5 V (5.5 V max per spec) |
| Digital I/O Pins | 16 |
| A/D Converter | 8-bit, 8 channels |
| D/A Converter | 8-bit, 1 channel |
| On-Chip Operational Amplifier | 1 |
| Analog Comparators | 2 |
| PSMC Peripheral | Yes (Programmable Switch-Mode Controller) |
| Timers | TMR0 (8-bit), TMR1 (16-bit), WDT |
| 動作温度 | -40C to +85C (Industrial, "I" suffix) |
| パッケージ | 20-SOIC (0.295 inch / 7.50 mm body) |
| Instruction Set | 14-bit, 35 single-word instructions |
| 実装タイプ | Surface Mount |
PIC16C781-I/SO ピン構成
| ピン 1 | MCLR/VPP — Master Clear (reset) input / programming voltage input |
| ピン 2 | RA0/AN0 — PORTA bit 0 / analog input channel 0 |
| ピン 3 | RA1/AN1 — PORTA bit 1 / analog input channel 1 |
| ピン 4 | RA2/AN2/CVREF — PORTA bit 2 / analog input channel 2 / comparator voltage reference output |
| ピン 5 | RA3/AN3 — PORTA bit 3 / analog input channel 3 |
| ピン 6 | RA4/AN4 — PORTA bit 4 / analog input channel 4 |
| ピン 7 | RA5/AN5 — PORTA bit 5 / analog input channel 5 |
| ピン 8 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| ピン 9 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| ピン 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| ピン 11 | RC1 — PORTC bit 1 |
| ピン 12 | RC2/CCP1 — PORTC bit 2 / Capture-Compare-PWM1 |
| ピン 13 | RC3 — PORTC bit 3 |
| ピン 14 | RC4 — PORTC bit 4 |
| ピン 15 | RC5 — PORTC bit 5 |
| ピン 16 | RC6 — PORTC bit 6 |
| ピン 17 | RC7 — PORTC bit 7 |
| ピン 18 | VSS — Ground reference |
| ピン 19 | VDD — Positive supply voltage |
| ピン 20 | RB0/INT — PORTB bit 0 / external interrupt input |
主な用途
PIC16C781-I/SO の用途: 6 件s: Switch-Mode Power Supply (SMPS) Primary-Side Control, Battery Charger Controller, LED Driver and Lighting Control, Fan and DC Motor Speed Controller, Industrial Sensor Signal Conditioning, Appliance Control Boards.
Switch-Mode Power Supply (SMPS) Primary-Side Control
The PIC16C781-I/SO's integrated PSMC peripheral generates programmable PWM outputs with dead-time control, allowing direct closed-loop control of a primary-side switching FET bridge without an external PWM controller IC. The 8-channel 8-bit A/D reads output voltage and current, the on-chip op-amp conditions the current-sense signal, and the two comparators provide fast fault-input paths for over-current protection. The 20 MHz instruction rate keeps the control loop well under 10 us, sufficing for 50-200 kHz SMPS designs in 5V-48V systems.
おすすめ
Battery Charger Controller
The PIC16C781-I/SO fits single-cell and multi-cell battery charger designs because the PSMC drives the charging-FET PWM, the on-chip op-amp amplifies the current-sense shunt signal, and the 8-bit A/D digitizes battery voltage and pack temperature for the charge-state algorithm. Two analog comparators implement fast over-voltage and over-current cutoff paths independent of firmware timing. Industrial temperature range (-40C to +85C) supports outdoor and automotive-cabin charger applications where the MCU sits near the battery thermal mass.
おすすめ
LED Driver and Lighting Control
Constant-current LED drivers benefit from the PIC16C781-I/SO's PSMC PWM output, op-amp current-sense amplifier, and 8-bit D/A converter (which can serve as an analog reference for a high-side current-sense loop). The 16 digital I/O pins allow direct drive of status LEDs, button inputs, and DMX-style dimming interfaces. The 5V supply rail is convenient for driving logic-level power FETs in buck and boost LED topologies, and the 20 MHz clock supports 16-bit PWM resolution at 200 kHz switching frequency.
おすすめ
Fan and DC Motor Speed Controller
Closed-loop BLDC and brushed-DC motor control up to a few hundred Hz electrical frequency fits the PIC16C781-I/SO: the PSMC provides the complementary PWM outputs for the H-bridge, the op-amp amplifies the shunt current-sense, the 8-bit A/D reads back EMF or tachometer feedback, and the two comparators handle over-current and over-temperature hardware trips. At 20 MHz, the firmware has ~200 ns per instruction to run a commutation table - sufficient for sensorless trapezoidal commutation of small fan motors.
おすすめ
Industrial Sensor Signal Conditioning
The PIC16C781-I/SO's on-chip op-amp and dual comparators let it serve as a sensor front-end: amplify a thermocouple or strain-gauge signal, digitize it with the 8-bit A/D, and apply linearization or alarm thresholds. The 16 digital I/O handle switch debouncing, relay drivers, and indicator LEDs. Industrial temperature grade and 5V supply tolerance make this part appropriate for factory-floor panels, HVAC controllers, and process-instrumentation sub-assemblies.
おすすめ
Appliance Control Boards
Cost-sensitive appliance control boards (coffee machines, washing machines, small kitchen appliances) benefit from the PIC16C781-I/SO's integrated analog peripherals that replace 2-3 external ICs. The PSMC drives a TRIAC or relay for heater/pump control, the op-amp reads NTC thermistor temperature, the comparators detect zero-cross for line-voltage TRIAC firing, and the 8-bit A/D monitors supply voltage and user-knob position. Industrial temp grade and 20-SOIC surface-mount package suit through-hole-replacement SMT conversions of legacy appliance boards.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: PIC16C781-I/SO — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | PIC16C781T-I/SO | PIC16F785-I/SO | PIC16C782-I/SO | PIC16C711-20I/SO | PIC16C716-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SOIC (0.295 inch) | 20-SOIC - same | 20-SOIC - same | 20-SOIC - same | 20-SOIC - same | 20-SOIC - same |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP | 3.5 KB Flash | 1.75 KB OTP | 1.75 KB OTP | 3.5 KB OTP |
| RAM | 128 B | 128 B | 128 B | 128 B | 68 B | 128 B |
| Max Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| PSMC Peripheral | Yes | Yes | Yes | Yes | No | No |
| On-Chip Op-Amp | 1 | 1 | 1 | 1 | 0 | 0 |
| Memory Type | OTP | OTP | Flash (reprogrammable) | OTP | OTP | OTP |
| Operating Temperature | -40C to +85C (I suffix) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
主な差別化要因
- On-chip PSMC peripheral for SMPS control without external PWM IC （vs PIC16C711-20I/SO)
- Higher RAM and richer analog peripheral set vs legacy PIC16C711 （vs PIC16C711-20I/SO)
- Flash reprogrammability with same SOIC-20 footprint and PSMC peripheral （vs PIC16F785-I/SO)
設計ノート
OTP memory cannot be reprogrammed in-circuit; firmware must be programmed using a Microchip device programmer (e.g., PICSTART Plus or MPLAB PM3) before or during board assembly. Any firmware bug discovered after programming requires replacing the silicon. For prototypes and field-updateable products, choose the Flash-based PIC16F785-I/SO instead. Per the Microchip PIC16C781 datasheet, programming is performed via the ICSP interface on pins RB6/RB7 plus MCLR/VPP.
PSMC PWM outputs driving an external FET bridge need careful PCB layout: keep the PSMC output traces short and away from analog input traces (A/D, op-amp, comparator inputs) to prevent switching-noise coupling into the analog signal path. Place the PSMC output bypass capacitor and gate-drive resistor within 5 mm of the FET gate. According to the Microchip PIC16C781 datasheet, the PSMC PWM outputs are on dedicated pins that must be configured correctly before enabling the peripheral.
Decouple VDD with a 100 nF ceramic capacitor as close to pins 19-20 as possible, plus a bulk 10 uF tantalum or aluminum on the board power entry. The PIC16C781-I/SO has multiple analog peripherals (A/D, D/A, op-amp, comparators) that benefit from a quiet analog supply - consider a small ferrite bead between VDD and AVDD if the board shares noisy digital supply with analog signal conditioning. Decoupling is critical when the PSMC is switching high-current loads.
コンプライアンス情報
RoHS/REACH/lead-free status not stated in the verified web data for this OTP part. Mark [DATA_NEEDED] in specs. Microchip publishes material-composition data on its product page; engineers should consult https://www.microchip.com/en-us/product/PIC16C781 for the latest environmental certification. Conflict-minerals compliance statement available via Microchip's corporate sustainability page.
