PIC16F1705-I/ST - 8-Bit 32MHz MCU 14KB Flash XLP | Microchip
MPN: PIC16F1705-I/ST ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.79 | $1.79 |
| 10 | $1.62 | $16.20 |
| 100 | $1.45 | $145.00 |
| 500 | $1.3 | $650.00 |
| 1,000 | $1.18 | $1,180.00 |
PIC16F1705-I/ST Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, typically used for embedded control in cost- and power-sensitive applications. The PIC16F1705 sits within the broader hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor device. Compared with 32-bit MCUs, 8-bit parts such as the PIC16F1705 consume less power, retain simpler toolchains, and remain preferred for simple sensor, motor, and human-interface tasks where deterministic behavior at low MHz is more valuable than raw compute throughput.
Key differentiating features include two on-chip operational amplifiers (a rare integration for an 8-bit MCU), Core Independent Peripherals (CLC, COG, Zero-Cross Detect) that offload logic from the CPU, Peripheral Pin Select (PPS) for flexible signal routing, and XLP technology for nanoWatt sleep currents. The device supports 10-bit ADC with computation, 8-bit DAC, PWM modules, EUSART, MSSP (I2C/SPI), and up to 12 I/O pins in this 14-pin TSSOP package. The combination of analog integration and zero-cross detection is purpose-built for sensor conditioning, lighting control, and small appliance designs.
Architecture-wise, the PIC16F1705 uses an enhanced mid-range PIC16 core with a hardware multiplier, a 16-level hardware stack, and a modified Harvard bus that separates instruction and data fetches. Internal oscillator calibration and on-chip debug support via ICD reduce external component count and accelerate time-to-prototype. According to Microchip datasheet 40001729C, the device operates from 1.8V to 5.5V, allowing direct connection to single-cell Li-ion, 2x AA, or 5V rails commonly found in consumer and industrial products.
Typical applications include AC zero-cross switching control (TRIAC/SSR drive), LED lighting ballasts, small motor control loops via COG, sensor signal conditioning using the on-chip op amps, and battery-powered IoT end-nodes where XLP nanoWatt sleep currents extend coin-cell life. The integrated 10-bit ADC with computation and dedicated op amps also suit cost-sensitive instrumentation and HVAC fan-control designs.
When selecting this part, designers should confirm the 14-pin TSSOP footprint matches the available PCB area and verify the 1KB RAM is sufficient for the application state machine. For designs needing more I/O, peripherals, or memory, the family sibling PIC16F1709 (20-pin) or PIC16F1713/1716 are drop-in alternatives within the same software ecosystem and toolchain (MPLAB X IDE, XC8 compiler).
This page aggregates distributor pricing, parameter-level comparison versus same-package PIC16F family siblings, drop-in alternatives, and practical design guidance not found in a single manufacturer datasheet.
Drop-in alternatives for PIC16F1705-I/ST — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC16F1705-I/ST (same form factor and footprint) — differing in Core Architecture, ADC, Package, DAC, Comparators.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F1704-I/ST
✅ Drop-In✓ In Stock
$0.62 / Unit
View Datasheet →PIC16LF1705-I/ST
✅ Drop-In✓ In Stock
$1.05 / Unit
View Datasheet →PIC16F1713-I/ST
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC16F1703-I/ST
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.84 / Unit
View Datasheet →PIC16F1705-I/ST Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC16 Enhanced Mid-Range |
| Program Memory (Flash) | 14 KB (8K x 14 words) |
| RAM | 1 KB |
| Maximum CPU Clock | 32 MHz |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Number of I/O Pins | 12 |
| ADC | 10-bit, up to 8 channels |
| DAC | 8-bit |
| On-Chip Operational Amplifiers | 2 |
| Comparators | 2 |
| Communication Peripherals | 1x EUSART, 1x MSSP (I2C/SPI) |
| Core Independent Peripherals | CLC, COG (Configurable Logic/Counter), Zero-Cross Detect, PPS |
| Operating Temperature | -40 C to +85 C (industrial grade) |
| Package | 14-TSSOP (4.4 mm, pitch 0.65 mm) |
| Mounting Type | Surface Mount |
PIC16F1705-I/ST Pin Configuration
| Pin 1 | VDD — Positive supply voltage (1.8V to 5.5V) |
| Pin 2 | RA5 — Bidirectional I/O pin; analog/digital peripheral functions |
| Pin 3 | RA4 — Bidirectional I/O pin |
| Pin 4 | RA3/MCLR/VPP — Master Clear (reset) input or digital I/O |
| Pin 5 | RA2 — Bidirectional I/O; analog input |
| Pin 6 | RA1/ICSPCLK — I/O; ICSP clock |
| Pin 7 | RA0/ICSPDAT — I/O; ICSP data |
| Pin 8 | VSS — Ground reference |
| Pin 9 | RB7 — Bidirectional I/O |
| Pin 10 | RB6 — Bidirectional I/O |
| Pin 11 | RB5 — Bidirectional I/O; analog input |
| Pin 12 | RB4 — Bidirectional I/O |
| Pin 13 | RB3 — Bidirectional I/O |
| Pin 14 | RB2 — Bidirectional I/O; analog input |
Typical Applications
PIC16F1705-I/ST is suitable for 6 applications: AC Zero-Cross Switching / TRIAC Control, LED Lighting Ballasts and Drivers, Battery-Powered IoT Sensor End-Nodes, Small Motor Control (BLDC / Stepper), Industrial Sensor Conditioning, HVAC Fan / Pump Speed Control.
AC Zero-Cross Switching / TRIAC Control
The PIC16F1705-I/ST's integrated Zero-Cross Detect peripheral simplifies optically-isolated TRIAC and SSR drive for AC loads. At 32 MHz instruction rate, the CPU can stay in Sleep between zero-cross events while the ZCD peripheral triggers interrupts, achieving sub-50us response. This fits dimmer controls, solid-state relay replacement, and AC switching for appliance control where minimizing EMI is critical, while the 1.8-5.5V supply allows direct operation from rectified mains via a capacitive dropper.
Recommended
LED Lighting Ballasts and Drivers
The PIC16F1705-I/ST can drive constant-current LED ballasts by combining its on-chip op amp for current sensing, 10-bit ADC for closed-loop measurement, and PWM module for FET drive. XLP nanoWatt sleep currents allow battery-backed emergency-LED drivers to idle months before mains return. With 12 I/O available in the 14-TSSOP, designers can drive 2-3 dimmable LED channels from a single MCU plus external MOSFETs, while Peripheral Pin Select adapts the PWM to any available pin for layout flexibility.
Recommended
Battery-Powered IoT Sensor End-Nodes
The PIC16F1705-I/ST's XLP technology delivers nanoamp Sleep currents, allowing coin-cell sensor end-nodes to operate for years. The on-chip 10-bit ADC reads temperature, humidity, or motion sensors directly; the integrated op amp amplifies low-output sensors like thermopiles or photo-diodes without external components. With EUSART and MSSP, the part can drive UART-based radios or SPI/ I2C sensors, while Core Independent Peripherals handle wake-up timing without CPU intervention.
Recommended
Small Motor Control (BLDC / Stepper)
Using the Configurable Logic Cell (CLC) and Complementary Output Generator (COG), the PIC16F1705-I/ST generates complementary PWM with dead-band insertion for brushless DC motor commutation without CPU load. The 32 MHz instruction rate and 10-bit ADC sample back-EMF signals fast enough for sensorless trapezoidal commutation on small fans or pumps. Twelve I/O pins provide H-bridge gate drive (6 PWMs) plus UART/SPI for feedback and tuning.
Recommended
Industrial Sensor Conditioning
The PIC16F1705-I/ST integrates two on-chip op amps that condition signals from bridge sensors (load cells, pressure sensors) and 4-20 mA loop receivers before the 10-bit ADC. Industrial -40°C to +85°C temperature grade supports factory-floor deployment. PPS routes ADC, comparator and PWM to any I/O, simplifying mixed-signal PCB layout, while the 14-TSSOP package supports hand-rework during prototype qualification.
Recommended
HVAC Fan / Pump Speed Control
The PIC16F1705-I/ST regulates fan or pump RPM via a closed-loop feedback using Zero-Cross Detect for AC line reference, op amp for current sensing, and PWM for TRIAC phase control. The 8-bit DAC is ideal for generating 0-10V analog control signals emulating industrial control standards. EUSART provides Modbus RTU slave connectivity for building automation systems, while XLP sleep mode keeps standby power below 0.5W to meet eco-design regulations.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F1705-I/ST — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F1704-I/ST | PIC16LF1705-I/ST | PIC16F1713-I/ST | PIC16F1703-I/ST |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 14-TSSOP | 14-TSSOP - same | 14-TSSOP - same | 14-TSSOP - same | 14-TSSOP - same |
| Flash | 14 KB | 7 KB (-50%) | 14 KB (same) | 7 KB (-50%) | 7 KB (-50%) |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 3.6 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Max CPU Clock | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| On-chip Op Amps | 2 | 2 | 2 | 2 | 2 |
| Zero-Cross Detect | Yes | Yes | Yes | Yes | Yes |
| Industrial Temp Grade | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Key Differentiators
- Integrated dual on-chip op amps (vs PIC16F1704-I/ST)
- Core Independent Peripherals (CLC, COG, ZCD) (vs PIC16F1703-I/ST)
- 1KB RAM vs 512B RAM (vs PIC16F1704-I/ST)
Design Notes
The PIC16F1705-I/ST shares its PIC16F17xx register set with the PIC16F1709 but the 14-pin TSSOP variant exposes fewer peripherals. Code written for the 20-pin PIC16F1709 may reference pins RB6/RB7 that are present on the 14-pin package as well as additional RA functions - always recompile against the 14-pin pin map or peripheral availability will silently break. Source: Microchip datasheet 40001729C.
Place the 0.1 uF VDD decoupling capacitor within 3 mm of pin 1 (VDD) and a bulk capacitor within 10 mm. The TSSOP-14 thermal pad is not present, so no PCB thermal copper requirement exists; however, for ADC noise performance, dedicate a quiet analog ground island that joins the digital ground at a single point near pin 8 (VSS).
When using the on-chip op amps for high-impedance sensors, route the inverting/non-inverting traces as a differential pair with a ground guard to avoid switching noise coupling from PWM outputs. The 10-bit ADC input bandwidth (per datasheet 40001729C) limits usable analog signal frequencies to ~250 kHz; pre-filter signals above this to avoid aliasing.
Estimated: at 32 MHz, VDD=3.3V, active current is approximately 4 mA (typical); in Sleep with peripherals disabled, XLP mode drops below 100 nA. Coin-cell life calculations should use Microchip's nanoWatt calculator because Sleep current varies with WDT, BOR and RTCC enable states.
Compliance Information
RoHS / REACH compliance status not provided in the verified web data; consult Microchip product page or contact Microchip directly for confirmation. Not AEC-Q100 qualified (industrial grade only).
