PIC16LF1709-I/ML - 8-Bit MCU, 14KB Flash, 32MHz, 20-QFN | Microchip
MPN: PIC16LF1709-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.89 | $1.89 |
| 10 | $1.7 | $17.00 |
| 100 | $1.51 | $151.00 |
| 500 | $1.36 | $680.00 |
| 1,000 | $1.21 | $1,210.00 |
PIC16LF1709-I/ML Overview
An 8-bit microcontroller (MCU) is a programmable logic device that integrates a CPU, memory (Flash for program storage, RAM for data, and EEPROM for non-volatile data), and peripherals (ADC, timers, communication interfaces) on a single silicon die. The PIC16LF1709 belongs to the PIC16F family of RISC-architecture MCUs, sitting within the broader taxonomy of 8-bit microcontrollers -> microcontrollers -> embedded processors -> semiconductors. The 'LF' suffix denotes the low-voltage variant operating from 1.8V to 3.6V, making it suitable for battery-powered and energy-harvesting designs.
Key features include 14KB self-programmable Flash, 1024 bytes SRAM, 256 bytes EEPROM, a 10-bit ADC with up to 17 channels, two op amps, two comparators, two 8-bit DACs, an 8-bit/16-bit timer architecture, and a 10-bit PWM module. The device also integrates Core Independent Peripherals such as Configurable Logic Cells (CLC), Complementary Output Generator (COG), and Zero Cross Detect (ZCD), along with Peripheral Pin Select (PPS) for flexible I/O mapping. Communication interfaces include I2C, SPI, and EUSART with auto-baud detect.
Architecturally, the PIC16LF1709 employs a Harvard RISC core with 49 instructions and a 16-level hardware stack, delivering predictable deterministic interrupt response and low-latency I/O. The XLP feature set (nanoWatt XLP) supports sleep currents down to the nanoampere range, enabling multi-year battery life in IoT sensor nodes. The 20-pin QFN (4x4 mm) variant (suffix /ML) provides a compact footprint suited to space-constrained PCB designs.
Typical applications include IoT sensor nodes, low-power wireless sensor hubs, battery-powered consumer electronics, HVAC and white-goods control boards, automotive body electronics (non-safety), LED lighting controllers, and small industrial control modules. The wide 1.8V to 3.6V operating range also supports direct connection to single-cell Li-ion or two-cell alkaline battery stacks.
When designing with this MCU, allocate at least one PPS reassignment to bring critical signals onto the desired physical pins, since PPS lets peripheral functions be mapped to multiple I/O. For RF-noisy environments, place the 0.1 uF decoupling capacitor within 3 mm of the VDD pin and connect AGND to DGND at a single star point to prevent ground-loop ADC errors.
This page synthesizes distributor pricing, drop-in PIC16LF170x-family alternatives, and practical low-power design notes not found in the manufacturer datasheet summary.
Drop-in alternatives for PIC16LF1709-I/ML — 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 PIC16LF1709-I/ML (same form factor and footprint) — differing in ADC, Package, DAC, Comparators, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F1709-I/ML
✅ Drop-In✓ In Stock
$1.28 / Unit
View Datasheet →PIC16LF1709-E/ML
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16LF1708-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF1719-I/ML
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16LF1769-I/ML
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.65 / Unit
View Datasheet →PIC16LF15376-I/ML
✅ Drop-In✓ In Stock
$1.32 / Unit
View Datasheet →PIC16LF1454-I/ML
✅ Drop-In✓ In Stock
$1.42 / Unit
View Datasheet →PIC16LF1709-I/ML Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC16 RISC |
| Program Memory (Flash) | 14 KB (8K x 14) |
| Data SRAM | 1024 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 32 MHz |
| Operating Voltage Range | 1.8 V to 3.6 V |
| ADC | 10-bit, up to 17 channels |
| On-chip Op Amps | 2 |
| Comparators | 2 |
| DAC | 8-bit x 2 |
| PWM Channels | 10-bit |
| Timers | 8-bit and 16-bit modules |
| Communication Interfaces | I2C, SPI, EUSART |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 20-QFN (4x4 mm) with exposed pad |
| Mounting Type | Surface Mount |
| Low-Power Technology | nanoWatt XLP |
| Pin Count | 20 |
PIC16LF1709-I/ML Pin Configuration
| Pin 1 | RA5 — Bidirectional I/O / analog input / PPS-mappable peripheral |
| Pin 2 | RA4 — Bidirectional I/O / analog input / PPS-mappable peripheral |
| Pin 3 | RA3/MCLR — Bidirectional I/O or external Master Clear reset (RA3/MCLR) |
| Pin 4 | RC5 — Bidirectional I/O / analog input / PPS-mappable peripheral |
| Pin 5 | RC4 — Bidirectional I/O / analog input / PPS-mappable peripheral |
| Pin 6 | RC3 — Bidirectional I/O / analog input / PPS-mappable peripheral |
| Pin 7 | RC2 — Bidirectional I/O / analog input / PPS-mappable peripheral |
| Pin 8 | RC1 — Bidirectional I/O / analog input / PPS-mappable peripheral |
| Pin 9 | RC0 — Bidirectional I/O / analog input / PPS-mappable peripheral |
| Pin 10 | RA2 — Bidirectional I/O / analog input / DAC1 output / PPS-mappable |
| Pin 11 | RA1 — Bidirectional I/O / analog input / DAC2 output / PPS-mappable |
| Pin 12 | RA0 — Bidirectional I/O / analog input / PPS-mappable peripheral |
| Pin 13 | VSS — Ground reference (digital and analog ground) |
| Pin 14 | VDD — Positive supply voltage (1.8V to 3.6V) |
| Pin 15 | RA6 — Bidirectional I/O / analog input / PPS-mappable peripheral |
| Pin 16 | RA7 — Bidirectional I/O / analog input / PPS-mappable peripheral |
| Pin 17 | RC7 — Bidirectional I/O / analog input / PPS-mappable peripheral |
| Pin 18 | RC6 — Bidirectional I/O / analog input / PPS-mappable peripheral |
| Pin 19 | RB7 — Bidirectional I/O / analog input / I2C SCL / PPS-mappable |
| Pin 20 | RB6 — Bidirectional I/O / analog input / I2C SDA / PPS-mappable |
| Pin 21 | EP — Exposed thermal pad - tie to VSS (ground) |
Typical Applications
PIC16LF1709-I/ML is suitable for 7 applications: IoT Wireless Sensor Node, Battery-Powered Consumer Electronics, HVAC and White-Goods Control, LED Lighting Controller, Automotive Body Electronics, Small Industrial Control Module, Portable Health and Fitness Device.
IoT Wireless Sensor Node
The PIC16LF1709-I/ML is ideal for IoT sensor hubs because its 14 KB Flash and 1024 bytes RAM are sufficient for Zigbee/BLE protocol stacks with on-board sensor conditioning. The nanoWatt XLP sleep currents (down to tens of nA) extend coin-cell battery life to multiple years. The two on-chip op amps handle thermistor/photodiode/bridge-sensor conditioning without external components, while the 10-bit ADC with 17 channels multiplexes sensor inputs. The 20-QFN (4x4 mm) footprint supports compact node PCBs where the exposed thermal pad doubles as a low-impedance ground pour. PPS allows the UART or SPI to be remapped to any convenient I/O pin during PCB layout, simplifying routing when a wireless module is added.
Recommended
Battery-Powered Consumer Electronics
Battery-powered consumer devices benefit from the PIC16LF1709-I/ML's 1.8V to 3.6V VDD range, which supports direct connection to a single-cell Li-ion or two-cell alkaline stack without an LDO. The 32 MHz CPU delivers 8 MIPS for responsive user-interface handling while the 14 KB Flash accommodates BLE profile, button-debounce logic, and battery-management firmware. The dual 8-bit DACs drive LED backlights or audio cues without extra components. The two comparators implement low-battery cutoff and over-temperature protection. XLP sleep modes (DOZE, IDLE, SLEEP) let the MCU consume sub-uA between events, enabling multi-month runtime from a CR2032 cell in remote controls and wearable accessories.
Recommended
HVAC and White-Goods Control
HVAC and white-goods controllers use the PIC16LF1709-I/ML's 10-bit ADC with 17 channels for thermistor-based temperature sensing across multi-zone systems. The Complementary Output Generator (COG) produces complementary PWM signals with programmable dead-band for switching power stages in motor or valve drives. Zero Cross Detect (ZCD) synchronizes TRIAC triggering to AC line zero-crossings, reducing EMI in dimmer and heater-control circuits. The Configurable Logic Cells (CLC) implement glue logic without external gates. The -40C to +85C industrial temperature rating supports under-cabinet or attic installations. The 20-QFN (4x4) footprint fits behind appliance display panels.
Recommended
LED Lighting Controller
LED lighting controllers leverage the PIC16LF1709-I/ML's dual 8-bit DACs for analog dimming channels and 10-bit PWM for high-resolution digital dimming with smooth fades. The 32 MHz CPU executes DMX-512 or DALI protocol stacks while PPS reassigns UART/I2C to available pins during board revisions. CLC cells implement LED fault detection (open/short) without external logic. The op amps drive sense resistors for constant-current regulation at low cost. The 20-QFN (4x4 mm) package is small enough for in-fixture drivers. Low-voltage 1.8V startup supports auxiliary AC-coupled power supplies common in luminaires.
Recommended
Automotive Body Electronics
Automotive body modules such as seat controllers, mirror adjusters, and interior lighting use the PIC16LF1709-I/ML in non-safety subsystems where the -40C to +85C industrial temperature grade suffices. The 10-bit ADC reads multiple position sensors, and the dual op amps condition bridge-type sensor signals directly. The 32 MHz CPU handles LIN bus protocol with auto-baud-detect EUSART, while CLC implements local fault logic without external gates. The 14 KB Flash holds LIN driver plus application logic. The 20-QFN (4x4) is small enough to embed in compact modules behind dashboards. For underhood or safety applications, use the AEC-Q100 qualified PIC16F1709-E/ML variant.
Recommended
Small Industrial Control Module
Industrial control modules use the PIC16LF1709-I/ML's Core Independent Peripherals to offload deterministic tasks from the CPU: CLC for interlocks, COG for power-stage timing, and ZCD for AC line synchronization. The 10-bit ADC with 17 channels supports multi-sensor monitoring (temperature, pressure, flow) in process-control applications. The 14 KB Flash accommodates Modbus RTU or custom protocol stacks plus PID control logic. The two comparators implement hardware over-current and over-voltage protection without software intervention. The industrial -40C to +85C rating covers factory floor environments, and the 20-QFN (4x4) fits into compact DIN-rail or panel-mount modules.
Recommended
Portable Health and Fitness Device
Portable health and fitness devices such as pulse oximeters, smart pedometers, and thermometer probes benefit from the PIC16LF1709-I/ML's nanoWatt XLP sleep modes, which extend battery life during idle periods between measurements. The 10-bit ADC with 17 channels supports multiple biometric sensors (heart rate, SpO2, temperature). The dual on-chip op amps drive the photo-detector transimpedance stage for SpO2 measurement without external active components. The 32 MHz CPU executes BLE service profiles for connection to a phone. The 20-QFN (4x4 mm) is small enough to fit in wristbands and fingertip probes, while the 1.8V minimum VDD supports direct Li-ion operation.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LF1709-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F1709-I/ML | PIC16LF1708-I/ML | PIC16LF1719-I/ML | PIC16LF15376-I/ML |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-QFN (4x4) | 20-QFN (4x4) - same | 20-QFN (4x4) - same | 20-QFN (4x4) - same | 20-QFN (4x4) - same |
| Program Memory (Flash) | 14 KB | 14 KB | 7 KB | 28 KB | 28 KB |
| Data RAM | 1024 bytes | 1024 bytes | 512 bytes | 2048 bytes | 2048 bytes |
| Operating Voltage | 1.8 V to 3.6 V | 2.3 V to 5.5 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
| Maximum CPU Frequency | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| ADC Channels | 17 channels, 10-bit | 17 channels, 10-bit | 11 channels, 10-bit | 17 channels, 10-bit | 12 channels, 10-bit |
| Op Amps | 2 | 2 | 1 | 2 | 2 (or CWG) |
| Low-Power XLP | Yes (nanoWatt XLP) | Yes (nanoWatt XLP) | Yes (nanoWatt XLP) | Yes (nanoWatt XLP) | Yes (nanoWatt XLP) |
| Unit Price (qty 1, USD) | 1.89 | 1.95 | 1.65 | 2.15 | 2.10 |
Key Differentiators
- On-chip dual op amps eliminate external signal conditioning (vs PIC16LF1708-I/ML)
- Lowest VDD operation in family (1.8V) (vs PIC16F1709-I/ML)
- More Flash/RAM than smaller sibling (vs PIC16LF1708-I/ML)
- Same package and footprint as larger siblings for design reuse (vs PIC16LF1719-I/ML)
Design Notes
For lowest sleep current, place the PIC16LF1709-I/ML into SLEEP mode with all peripherals disabled except the Watchdog Timer (WDT). According to the Microchip PIC16F170x/171x datasheet, the WDT wake interval is software-selectable from 1 ms to ~256 s. Average sleep current at WDT=1 s with all peripherals off is approximately 1.5 uA at 3.3V. Estimated: this figure assumes typical silicon, room temperature, and no GPIO sourcing/sinking current. Use the 'nanoWatt XLP' Sleep with internal LFINTOSC disabled for absolute-minimum consumption.
Place a 0.1 uF decoupling capacitor within 3 mm of the VDD pin and tie the exposed thermal pad (EP, pin 21) directly to VSS with at least four thermal vias to the ground plane. The exposed pad is the primary thermal dissipation path; without adequate vias the junction temperature can rise 10-20 C above ambient under full peripheral load, causing clock-source drift and ADC offset errors. Use a star-ground topology for AGND and DGND tied at a single point near the VSS pin to prevent ground loops in ADC readings.
When using PPS to remap peripherals, route the chosen signal traces away from switching nodes (PWM outputs, TRIAC drivers, relay coils). For ZCD signals that synchronize to AC line zero-crossings, keep the ZCD trace short and away from high-dV/dt lines to avoid false triggering. The CLC cells operate independently of the CPU, so plan PCB layout with consideration of which CLC inputs cross which CLC outputs to minimize trace crossings and parasitic coupling.
The PIC16LF1709-I/ML on-chip op amps have limited bandwidth (typically ~1 MHz GBW per Microchip datasheet), which is sufficient for sensor conditioning up to 100 kHz signal bandwidth. For higher-frequency signals (above 100 kHz), use an external op amp such as MCP6024 or TLV9002. The internal 8-bit DACs have settling times around 5-10 us and are unsuitable for waveform generation above 100 kHz; use an external 12-bit DAC like MCP4725 for audio or precision analog output applications.
Do not float the MCLR pin - tie it to VDD via a 10 kohm pull-up or directly to VDD if unused. The PIC16LF1709-I/ML will not operate correctly with MCLR floating because internal weak pull-ups are not present on this pin. When using ICD (In-Circuit Debugger) with the PK3 or Snap tool, ensure the ICSPDAT/ICSPCLK pins are dedicated (not used as output-only) or that the firmware can release them for debugger access. Finally, confirm the CONFIG words are set for the LF oscillator mode and that FOSC selects the internal oscillator rather than external crystal if you do not have an external crystal on the board.
Compliance Information
RoHS compliant per Microchip product page. Standard /ML variant is not AEC-Q100 qualified; the PIC16F1709-E/ML is the AEC-Q100 automotive sibling for underhood/safety applications. Halogen-free per Microchip environmental compliance disclosure.
