PIC16LF1705-I/ST - 8-bit 32MHz 14KB Flash XLP MCU | Microchip
MPN: PIC16LF1705-I/ST ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.62 | $1.62 |
| 10 | $1.49 | $14.90 |
| 100 | $1.31 | $131.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $1.05 | $1,050.00 |
PIC16LF1705-I/ST Overview
An 8-bit microcontroller (MCU) is a low-power programmable processor built around an 8-bit data path, well suited to cost-sensitive embedded control. PIC16F170x/171x MCUs combine this 8-bit core with on-chip analog and the eXtreme Low Power (XLP) family of sleep and active modes, occupying a tier in the hierarchy: 8-bit MCU → microcontroller → embedded processor → semiconductor. The 'LF' prefix denotes the wide-voltage 1.8V-3.6V supply variant for battery-powered designs.
Key features include 32 MHz max CPU speed from the internal oscillator, 14KB Flash, 1024B SRAM, hardware CLC for combinational/sequential logic without discrete gates, PWM with CCP, and serial interfaces including EUSART, I2C, and SPI. On-chip peripherals such as the 10-bit ADC, op-amp and 8-bit DAC reduce external BOM and PCB area in sensor-interface applications.
The architecture combines a RISC-like Harvard core with vectored interrupts and a 14-bit instruction word, enabling compact code density and deterministic interrupt response. PPS allows flexible routing of digital peripherals to any I/O pin, simplifying PCB layout for mixed-signal designs where analog and digital routing would otherwise conflict.
Typical applications include IoT sensor nodes, battery-powered instrumentation, LED lighting control, consumer appliances, and low-cost motor control where the integrated op-amp and DAC simplify analog front-ends. Designers commonly pair this MCU with discrete power management and low-power wireless transceivers.
When designing with this part, validate current consumption in the chosen sleep mode against battery-life targets: nanoWatt XLP idle currents are well below 1 µA but require correct configuration of the watchdog, brown-out reset and peripheral clocks. PPS remapping must be programmed before peripheral enable to avoid glitches on boot.
This page synthesizes distributor pricing, drop-in package-compatible alternatives from the PIC16F170x family, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC16LF1705-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 PIC16LF1705-I/ST (same form factor and footprint) — differing in MSL Level, Comparators, Operating Temperature, ADC, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F1705-I/ST
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF1705-I/SL
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16LF1705-I/P
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16LF1705T-I/ST
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.98 / Unit
View Datasheet →PIC16LF1705-E/ST
✅ Drop-In✓ In Stock
$0.91 / Unit
View Datasheet →PIC16LF1705-I/ST Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Family | PIC16F170x / PIC16LF1705 |
| Program Memory (Flash) | 14 KB (8K x 14 words) |
| Data Memory (SRAM) | 1024 bytes |
| Maximum CPU Speed | 32 MHz |
| Supply Voltage Range | 1.8 V to 3.6 V (LF variant) |
| ADC | 10-bit |
| DAC | 8-bit |
| Operational Amplifier | 1 on-chip |
| Comparators | High-speed comparator |
| Zero-Cross Detect (ZCD) | Yes |
| Configurable Logic Cells (CLC) | Yes |
| Peripheral Pin Select (PPS) | Yes |
| PWM / CCP | Yes |
| Serial Interfaces | EUSART, I2C, SPI |
| Package | 14-pin TSSOP (ST) |
| Operating Temperature | -40 to +85 °C (Industrial) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
PIC16LF1705-I/ST Pin Configuration
| Pin 1 | VDD — Positive supply voltage (1.8V-3.6V) |
| Pin 2 | RA5 — I/O port A bit 5 with IOC and ADC |
| Pin 3 | RA4 — I/O port A bit 4 with IOC |
| Pin 4 | RA3/MCLR — I/O / Master Clear (reset, active low) |
| Pin 5 | RC5 — I/O port C bit 5 with PPS |
| Pin 6 | RC4 — I/O port C bit 4 with PPS |
| Pin 7 | RC3 — I/O port C bit 3 with PPS |
| Pin 8 | RC2 — I/O port C bit 2 with PPS |
| Pin 9 | RC1 — I/O port C bit 1 with PPS |
| Pin 10 | RC0 — I/O port C bit 0 with PPS |
| Pin 11 | RA2 — I/O port A bit 2 with op-amp output and DAC |
| Pin 12 | RA1 — I/O port A bit 1 with op-amp inverting input |
| Pin 13 | RA0 — I/O port A bit 0 with op-amp non-inverting input |
| Pin 14 | VSS — Ground reference |
Typical Applications
PIC16LF1705-I/ST is suitable for 6 applications: Battery-Powered IoT Sensor Node, LED Lighting and Dimming Control, Consumer Appliance Control, Low-Cost BLDC Motor Control, Industrial Sensor Transmitter, Wearable Health and Fitness Device.
Battery-Powered IoT Sensor Node
The PIC16LF1705-I/ST fits battery-powered IoT sensor nodes because its 1.8V-3.6V supply aligns with single-cell Li-ion or 2xAA chemistries, while the 10-bit ADC and on-chip op-amp provide direct sensor conditioning without external analog front-ends. With nanoWatt XLP sleep currents below 1 µA and 14KB Flash supporting a complete BLE/Zigbee host stack, this MCU enables multi-year coin-cell lifetimes. Place the part near the sensor with the on-chip op-amp configured as a transimpedance or unity-gain buffer, and use PPS to route the wake-up interrupt to any I/O. Unlike higher-performance Cortex-M0 parts, the PIC16LF1705 adds negligible quiescent draw in sleep and avoids external LDO requirements above 2V rails.
Recommended
LED Lighting and Dimming Control
The PIC16LF1705-I/ST suits LED lighting and dimming because its CCP/PWM modules generate dimming signals up to 32 MHz peripheral clock, while the on-chip 8-bit DAC and op-amp deliver analog current control for constant-current drivers. The 14KB Flash stores lookup tables for color-temperature curves and flicker-free dim profiles. Place the MCU upstream of a constant-current LED driver with the PWM output modulating driver enable or reference; the on-chip zero-cross detect (ZCD) enables TRIAC-dimmable mains designs. Unlike discrete 555-timer dimmers, the MCU adds programmable dim curves, status telemetry, and wireless dimmer-knob integration without raising BOM cost.
Recommended
Consumer Appliance Control
The PIC16LF1705-I/ST targets consumer appliance control (coffee makers, blenders, small kitchen appliances) because its integrated op-amp, comparator, and zero-cross detect enable direct mains-side sensing without external signal conditioning. The 14KB Flash and 1024B SRAM fit state-machine firmware for sensor-driven cooking profiles and user-interface handling. According to the Microchip datasheet, the on-chip 10-bit ADC reads NTC thermistors and rotary controls, while PWM drives triac gates or MOSFETs. Place the MCU on the low-voltage secondary side with the op-amp buffering a current-sense shunt; the ZCD synchronizes PWM to AC line for low-noise triac firing. Compared to discrete logic, this MCU adds programmability and field-upgradable features.
Recommended
Low-Cost BLDC Motor Control
The PIC16LF1705-I/ST fits low-cost BLDC motor control because its high-speed comparator and zero-cross detect enable back-EMF sensing without dedicated motor-control peripherals, while CCP/PWM outputs drive the three-phase inverter at up to 32 MHz. The 1.8V-3.6V supply aligns with 2xAA or single-cell Li-ion fans and small pumps. According to the Microchip datasheet, the 14KB Flash stores sensorless start-up routines and PI controller firmware. Place the MCU on the low-voltage side with the comparator sensing back-EMF through a resistor divider; ZCD synchronizes commutation to rotor position. Compared to dsPIC dedicated motor parts, the PIC16LF1705 keeps BOM cost low at the expense of advanced field-oriented control.
Recommended
Industrial Sensor Transmitter
The PIC16LF1705-I/ST is well-suited to industrial 4-20 mA sensor transmitters because its 10-bit ADC and on-chip op-amp directly interface with bridge sensors (load cells, strain gauges) and RTDs without external instrumentation amplifiers. The 1.8V-3.6V supply simplifies loop-powered designs where the MCU shares the 4-20 mA loop with a shunt regulator. According to the Microchip datasheet, the EUSART outputs HART or Modbus frames, and the CLC implements custom logic for sensor diagnostics. Place the op-amp as a gain stage ahead of the ADC, with PPS routing the UART to the loop interface. Compared to discrete op-amp + ADC solutions, this MCU reduces PCB area by ~50% and lowers power consumption in 4-20 mA loops.
Recommended
Wearable Health and Fitness Device
The PIC16LF1705-I/ST fits wearable health devices (heart-rate, SpO2, step counters) because its nanoWatt XLP sleep modes drop current below 1 µA while a periodic timer wakes the part to take a measurement, and its 10-bit ADC plus on-chip op-amp reads PPG photodiode signals without a dedicated AFE. The 14KB Flash stores firmware for motion-compensated heart-rate algorithms and BLE command handlers. According to the Microchip datasheet, PPS routes the I2C/SPI peripheral to any GPIO, simplifying PCB routing to the optical sensor. Compared to Cortex-M0+ wearables parts, the PIC16LF1705 consumes less in deep sleep and ships with on-chip op-amp, removing one external IC from the BOM.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LF1705-I/ST — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F1705-I/ST | PIC16LF1705-I/SL | PIC16LF1705-I/P | PIC16LF1705-E/ST | PIC16LF1705T-I/ST |
|---|---|---|---|---|---|---|
| Package | 14-pin TSSOP (ST) | 14-pin TSSOP (ST) - same | 14-pin SOIC (SL) | 14-pin PDIP (P) | 14-pin TSSOP (ST) - same | 14-pin TSSOP (ST) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Supply Voltage Range | 1.8V - 3.6V | 2.3V - 5.5V | 1.8V - 3.6V | 1.8V - 3.6V | 1.8V - 3.6V | 1.8V - 3.6V |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +125C (Extended) | -40C to +85C |
| Program Memory (Flash) | 14 KB | 14 KB | 14 KB | 14 KB | 14 KB | 14 KB |
| Data Memory (SRAM) | 1024 B | 1024 B | 1024 B | 1024 B | 1024 B | 1024 B |
| Maximum CPU Speed | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| On-chip Analog (ADC/DAC/OpAmp) | 10b ADC + 8b DAC + OpAmp | 10b ADC + 8b DAC + OpAmp | 10b ADC + 8b DAC + OpAmp | 10b ADC + 8b DAC + OpAmp | 10b ADC + 8b DAC + OpAmp | 10b ADC + 8b DAC + OpAmp |
| Unit Price (USD, qty 1) | 1.62 | 1.62 | 1.62 | 1.62 | 1.71 | 1.62 |
Key Differentiators
- Wide-voltage 1.8V-3.6V supply on a 32 MHz 8-bit core with 14KB Flash (vs PIC16F1705-I/ST)
- On-chip op-amp, 8-bit DAC, and zero-cross detect integrated (vs PIC16LF1704-I/ST)
- Industrial -40C to +85C operating temperature as standard grade (vs PIC16LF1705-E/ST)
Design Notes
Estimated: at 3.3V VDD and 32 MHz active CPU, the PIC16LF1705-I/ST draws approximately 4 mA typical. In Sleep mode with WDT disabled, current drops below 100 nA per the Microchip datasheet. For coin-cell designs targeting multi-year battery life, ensure the MCU spends >99.9% of time in Sleep, wake via IOC or RTCC, and disable unused peripherals via PMD registers. Brown-out reset (BOR) must be enabled to prevent Flash corruption during brown-out events.
Place a 100 nF decoupling capacitor within 5 mm of the VDD pin and a 10 µF bulk capacitor near the IC. According to the Microchip datasheet DS40001725D, the analog supply AVVDD (if separate) requires its own 100 nF decoupling cap tied to AVSS. The ICSP/PGD/PGC pins share general-purpose I/O, so keep programming-header traces short to avoid signal-integrity issues during in-circuit serial programming.
Estimated: configuration words must be set correctly before any code execution, or the part may operate at unexpected oscillator frequency or with watchdog disabled. PPS assignments must be unlocked via PPSLOCK = 0x55, 0xAA sequence before peripheral routing changes; otherwise the peripheral output goes to a default pin. CLC configurations should be reviewed for race conditions when inputs change asynchronously, since combinational logic can generate short glitches on the CLC output.
Compliance Information
RoHS and REACH compliant per Microchip product page; not AEC-Q100 qualified (PIC16F1705-E/ST or higher automotive grade parts required for AEC-Q100).
