PIC16F785-E/SS - 8-bit MCU, 3.5KB Flash, 18 I/O, SSOP-20 | Microchip
MPN: PIC16F785-E/SS ✓ Hoạt độngPIC16F785-E/SS Tóm tắt
A PIC16 mid-range 8-bit microcontroller is a single-chip computer that combines a RISC CPU, non-volatile program memory (Flash), volatile data memory (SRAM), and a rich set of analog and digital peripherals into one IC. Within the broader taxonomy it sits under the hierarchy microcontroller -> embedded MCU -> semiconductor device, with the PIC16F785 specifically positioned for mixed-signal power-control applications where on-chip op-amps, comparators, and PWM must be tightly coupled to firmware for fast control loops.
Differentiating features of the PIC16F785 include nanoWatt Technology for ultra-low-power sleep modes, an ICD as primary analog-input channel, Master Synchronous Serial Port (MSSP) supporting SPI and I2C, an Enhanced Universal Synchronous/Asynchronous Receiver Transmitter (EUSART), and 8 MHz internal oscillator. The two integrated op-amps remove the need for external signal-conditioning stages in current-shunt amplifiers or trans-impedance front-ends. The 2-phase asynchronous-feedback PWM is engineered for bridgeless PFC and soft-switching topologies.
Architecturally, the PIC16F785 uses a Harvard-class 14-bit instruction set with an 8-bit data path, an 8-level deep hardware stack, and direct/indirect addressing modes. Analog integration reduces BOM count and PCB area. When migrating code, designers should note the interrupt structure, peripheral pin-select constraints, and oscillator configuration bits.
Typical applications include switched-mode power supplies (SMPS) with active PFC, battery chargers (CC/CV profiles), LED drivers with analog dimming, sensor signal conditioning, and low-cost industrial controls. The wide 2.0-5.5 V range enables direct battery-powered operation. Watchdog timer, brown-out reset, and Flash configuration-word protection support field-deployed reliability.
Design tip: Use the integrated op-amps to amplify current-sense shunt signals directly to the ADC, eliminating one external stage. Ensure decoupling capacitors (100 nF + 10 µF) are placed within 5 mm of VDD/AVDD pins, and route the analog AVSS separately from digital GND back to the regulator ground star.
This page synthesizes distributor pricing, drop-in SSOP-20 alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single decision-ready reference for the PIC16F785-E/SS.
Bộ thay thế dễ dàng lắp đặt cho PIC16F785-E/SS — 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 PIC16F785-E/SS (cùng hình factor và footprint) — khác nhau ở Package, ADC, Timers, Comparators, I/O Pins.
PIC16F785-I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F785-E/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F785T-E/SS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F785-H/SS
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F785-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F676-E/SS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F785-E/SS Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16 (mid-range, 14-bit instruction, 8-bit data path) |
| Program Memory (Flash) | 3.5 KB (3584 bytes) |
| Data Memory (SRAM) | 128 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 20 MHz (200 ns instruction cycle) |
| Operating Voltage | 2.0 V to 5.5 V |
| I/O Pins | 18 digital I/O |
| ADC | 12-bit, 8 channels |
| Comparators | 2 high-speed comparators with programmable reference |
| Operational Amplifiers | 2 rail-to-rail input/output op-amps |
| PWM | Dual 2-phase asynchronous-feedback PWM module |
| Communication | MSSP (SPI / I2C), EUSART |
| Timers | Timer0, Timer1, Timer2 |
| Internal Oscillator | 8 MHz (factory calibrated) |
| Nhiệt độ hoạt động | -40 °C to +125 °C (Industrial / E grade) |
| Hộp | SSOP-20 (5.30 mm body, 0.65 mm pitch) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 (unlimited floor life) |
| Trạng thái RoHS | Compliant |
| Special Functions | nanoWatt Technology, ICD, brown-out reset, watchdog timer |
Cấu hình chân PIC16F785-E/SS
| Chân 1 | RA5/AN4/C2OUT/T1CKI/OSC1/CLKIN — Bidirectional I/O, analog ch4, comparator-2 out, Timer1 clock, oscillator input |
| Chân 2 | RA4/AN3/T1G/C1OUT/OSC2/CLKOUT — Bidirectional I/O, analog ch3, Timer1 gate, comparator-1 out, oscillator output |
| Chân 3 | RA3/MCLR/VPP — Bidirectional I/O or master clear (reset) input / programming voltage |
| Chân 4 | RC5/CCP1/P1A — Bidirectional I/O or PWM1 output A |
| Chân 5 | RC4/C2OUT/P1B — Bidirectional I/O or comparator-2 out / PWM1 output B |
| Chân 6 | RC3/AN7/C12IN3-/P1C — Bidirectional I/O, analog ch7, comparator input / PWM1 output C |
| Chân 7 | RC2/AN6/C12IN2-/P1D — Bidirectional I/O, analog ch6, comparator input / PWM1 output D |
| Chân 8 | RC1/AN5/C12IN1-/P2E — Bidirectional I/O, analog ch5, comparator input / PWM2 output E |
| Chân 9 | RC0/AN4/P2F — Bidirectional I/O, analog ch4 / PWM2 output F |
| Chân 10 | RB7/ICSPDAT/ICD — Bidirectional I/O or in-circuit serial programming data |
| Chân 11 | RB6/ICSPCLK — Bidirectional I/O or in-circuit serial programming clock |
| Chân 12 | RB5/AN11/OP2-/C12IN3+ — Bidirectional I/O, analog ch11, op-amp-2 inverting input, comparator non-inverting input |
| Chân 13 | RB4/AN10/OP2+/SDI/SDA — Bidirectional I/O, analog ch10, op-amp-2 non-inverting input, SPI data in / I2C data |
| Chân 14 | RB3/AN9/CCP1/OP2OUT/PGM — Bidirectional I/O, analog ch9, PWM1, op-amp-2 output |
| Chân 15 | RB2/AN8/OP1-/C12IN2+ — Bidirectional I/O, analog ch8, op-amp-1 inverting input, comparator non-inverting input |
| Chân 16 | RB1/AN6/OP1+/C12IN0+/INT — Bidirectional I/O, analog ch6, op-amp-1 non-inverting input, comparator input, external interrupt |
| Chân 17 | RB0/AN12/INT/OP1OUT — Bidirectional I/O, analog ch12, external interrupt, op-amp-1 output |
| Chân 18 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| Chân 19 | AVDD — Analog positive supply voltage (connect to VDD for best ADC performance) |
| Chân 20 | VSS — Ground reference |
Ứng dụng tiêu biểu
PIC16F785-E/SS phù hợp cho 7 Áp dụngs: Switched-Mode Power Supply (SMPS) with PFC, Battery Charger (CC/CV, JEITA, Fuel Gauge), LED Driver with Analog Dimming, Industrial Sensor Signal Conditioning, Solar Micro-Inverter / MPPT Controller, Motor Control (BLDC, Stepper, DC Brush), Smart Home IoT Sensor Hub.
Switched-Mode Power Supply (SMPS) with PFC
The PIC16F785's 20 MHz PIC16 core runs current-mode control loops fast enough for 100 kHz+ switching converters, while the dual on-chip op-amps amplify current-sense shunt and input-voltage signals directly into the 12-bit ADC. The 2-phase asynchronous-feedback PWM generates complementary or interleaved gate-drive signals for bridgeless PFC stages, eliminating an external PWM IC and reducing BOM. The SSOP-20 footprint allows compact designs in 50 W to 500 W power supplies.
Được đề xuất
Battery Charger (CC/CV, JEITA, Fuel Gauge)
For Li-ion and lead-acid chargers, the PIC16F785 12-bit ADC measures pack voltage (via a divider) and charge current (via a shunt), while a comparator terminates charge at the user-set CV threshold. Its 256 bytes of EEPROM store JEITA temperature tables, fuel-gauge curves, and end-of-cycle logs. The integrated PWM can drive a synchronous buck or a flyback primary. The wide 2.0-5.5 V range lets the MCU run directly from a single Li-ion cell during precharge.
Được đề xuất
LED Driver with Analog Dimming
LED drivers need constant-current regulation and 0-10 V or DALI dimming, both easily handled by the PIC16F785. The 12-bit ADC reads the dimmer input while the 2-phase PWM generates constant-frequency gate signals to a buck IC. Op-amps form the transconductance stage for current sensing. The SSOP-20 package allows the entire analog/PWM/control loop to fit on a 25 mm × 25 mm board for downlights and troffers.
Được đề xuất
Industrial Sensor Signal Conditioning
Industrial 4-20 mA loops and bridge sensors benefit from the PIC16F785's two integrated op-amps, which provide instrument-amp gain for load-cell or strain-gauge bridges and a rail-to-rail output for the ADC. The MSSP supports I2C for HMI displays, while EUSART handles RS-485-style communication. The -40 to +125 °C industrial temperature grade and the 2.0-5.5 V supply permit operation from 24 V industrial rails.
Được đề xuất
Solar Micro-Inverter / MPPT Controller
The PIC16F785's dual PWM channels drive an interleaved boost MPPT converter or a micro-inverter H-bridge at up to 20 MIPS of loop bandwidth. The two comparators provide hardware cycle-by-cycle current limiting, while the op-amps condition the panel voltage/current signals. 3.5 KB of Flash fits perturb-and-observe or incremental-conductance MPPT firmware with adaptive step-size, and 256 bytes of EEPROM persist settings across power cycles.
Được đề xuất
Motor Control (BLDC, Stepper, DC Brush)
For small BLDC or stepper drives, the PIC16F785 generates 6-step or trapezoidal commutation via the PWM module while the comparators handle back-EMF zero-cross detection. Op-amps sense phase currents for torque control. With 18 GPIO and the 2-phase PWM, the MCU can simultaneously drive a small stepper or sensorless BLDC up to a few hundred Hz of electrical frequency, fitting robotics, fans, pumps, and small appliances.
Được đề xuất
Smart Home IoT Sensor Hub
Low-cost smart-home sensors (temperature, humidity, occupancy) can use the PIC16F785 as a small controller: the 12-bit ADC reads analog sensors, MSSP talks I2C to environmental sensors, and nanoWatt Technology enables battery-life measured in years. The integrated op-amps can buffer a thermistor bridge or a photodiode trans-impedance stage without external ICs, and the SSOP-20 footprint suits coin-cell powered PCBAs with BLE/Wi-Fi companion modules.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F785-E/SS — 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 | PIC16F785-I/SS | PIC16F785T-E/SS | PIC16F785-I/SO | PIC16F785-E/P | PIC16F676-E/SS |
|---|---|---|---|---|---|---|
| Package | SSOP-20 | SSOP-20 (same) | SSOP-20 (same) | SOIC-20 (wider body, compatible SSOP-20 footprint pads need rework) | PDIP-20 (thru-hole) | SSOP-20 (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 3.5 KB | 3.5 KB | 3.5 KB | 3.5 KB | 1.75 KB (-50%) | |
| SRAM | 128 bytes | 128 bytes | 128 bytes | 64 bytes (-50%) | ||
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | ||
| CPU Speed | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS | ||
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | ||
| Operating Temperature | -40 °C to +125 °C | -40 °C to +85 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | |
| Integrated Op-Amps | 2 (rail-to-rail) | 2 | 2 | 0 | ||
| ADC Resolution | 12-bit | 12-bit | 12-bit | 10-bit | ||
| 2-Phase Async PWM | Yes | Yes | Yes | No (standard ECCP only) | ||
| Unit Price (qty 1) | $2.10 | ~$2.10 (similar) | ~$2.10 (similar) | ~$1.45 (-31%) |
Bảo phân biệt quan trọng
- Two integrated rail-to-rail op-amps on-chip (vsPIC16F676-E/SS)
- Dual 2-phase asynchronous-feedback PWM block (vsPIC16F877A)
- 3.5 KB Flash and 12-bit ADC in SSOP-20 (vsPIC16F676-E/SS)
- Higher operating temperature grade (-40 to +125 °C) (vsPIC16F785-I/SS)
Ghi chú thiết kế
Place a 100 nF ceramic decoupling capacitor within 5 mm of VDD (pin 18) and another within 5 mm of AVDD (pin 19); route both ground returns directly to the VSS pin (pin 20) star ground. Estimated: at 20 MHz and 3.3 V with peak transient currents of ~20 mA, a long VDD trace (>10 mm) without local decoupling can introduce 50-100 mV of switching noise that couples into the 12-bit ADC readings. Use a separate analog ground pour under the analog pins and join it only at the VSS pin.
The PIC16F785 integrates two rail-to-rail op-amps, which can be powered directly from VDD. To maximize signal headroom, set VDD to at least 4.5 V when interfacing 0-10 V analog sensors. Estimated: at 5.0 V VDD and 100 kHz PWM, the device draws ~15 mA active and ~1 µA in nanoWatt sleep; for battery-powered designs, leverage the sleep-and-wake-on-WDT pattern to achieve sub-10 µA average consumption.
Do not leave the MCLR pin floating. Tie MCLR (pin 3) to VDD through a 10 kΩ resistor and add a 100 nF cap to ground for noise filtering. Do not load the op-amp outputs with less than 5 kΩ - the integrated op-amps cannot drive low-impedance loads directly. Always configure the configuration word (CONFIG) before firmware reset; an incorrect oscillator select can lock the device. Verify the analog pin assignments in the ADC register (ANSEL) before enabling analog reads.
At maximum operating temperature (+125 °C) and 20 MHz, ensure the SSOP-20 copper pad area is at least 50 mm² on a 1-oz copper layer. Estimated: SSOP-20 with 50 mm² copper pad has θJA ≈ 60 °C/W, so at 25 mA × 3.3 V = 82.5 mW dissipation, the junction rises only ~5 °C above ambient. For enclosed housings with limited airflow, derate VDD or CPU clock to keep junction below +125 °C.
When using the 2-phase PWM, route the PWM traces (P1A-P1D, P2E, P2F) with controlled impedance and length matching within 2 mm to avoid duty-cycle skew. Keep the gate-drive traces away from the analog op-amp input traces (OP1IN+, OP1IN-, OP2IN+, OP2IN-). Add 10 kΩ pull-downs on unused PWM outputs to prevent floating-gate MOSFET turn-on during firmware initialization.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Halogen-free SSOP-20 package. Not AEC-Q100 qualified - for automotive, choose PIC16F785-H/SS automotive grade (if available).
