PIC16LF1709T-I/SS - 8-bit 32MHz XLP MCU, 14KB Flash 20-SSOP | Microchip
MPN: PIC16LF1709T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.34 | $134.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $1.05 | $1,050.00 |
PIC16LF1709T-I/SS Overview
What is an 8-bit PIC XLP microcontroller? An 8-bit PIC microcontroller is a RISC-based Harvard-architecture MCU that executes one instruction per clock cycle. The 'LF' suffix designates the low-voltage 'F' process, ideal for coin-cell and lithium-battery powered products. It belongs to the PIC16F170x/171x product family, which adds on-chip op amps, DACs, Core Independent Peripherals (CLC, COG, Zero Cross Detect) and Peripheral Pin Select, sitting between a bare PIC10/12/16 baseline MCU and a more complex PIC18/dsPIC33 device in Microchip's portfolio.
Key features include 14 KB Flash, 1024 B SRAM, 128 B EEPROM, 32 MHz CPU, an internal 32 MHz HFINTOSC, two op amps, two 10-bit DACs, a 10-bit ADC, two comparators and a Zero Cross Detect peripheral. Integrated Core Independent Peripherals (CIPs - CLC, COG, NCO, ZCD) handle events in hardware without CPU intervention, freeing the core for application logic.
Typical applications are sensor conditioning with op-amp front-end, TRIAC zero-cross light dimming, capacitive-touch human interface, portable medical and consumer wearables, and small motor/solenoid driving, all of which rely on the device's on-chip analog and the XLP sleep current. Consider pin budget, op-amp output drive and ZCD range when substituting parts with different package options.
Drop-in alternatives for PIC16LF1709T-I/SS — 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 PIC16LF1709T-I/SS (same form factor and footprint) — differing in Package, ADC, DAC, Operating Temperature, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LF1709-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF1709-I/ML
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.21 / Unit
View Datasheet →PIC16F1709T-I/SS
✅ Drop-In✓ In Stock
$1.39 / Unit
View Datasheet →PIC16LF1719T-I/SS
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16LF1559T-I/SS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.28 / Unit
View Datasheet →PIC16LF1579T-I/SS
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16LF1509-I/SS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.4 / Unit
View Datasheet →PIC16LF1709T-I/SS Maximum Ratings & Electrical Characteristics
| Core | PIC16 8-bit RISC |
| CPU Speed (max) | 32 MHz |
| Instruction Width | 14-bit (8K x 14 words) |
| Program Memory (Flash) | 14 KB |
| Data SRAM | 1024 bytes |
| Data EEPROM | 128 bytes |
| Operating Voltage | 1.8 V to 3.6 V (LF process) |
| I/O Pins | 17 |
| ADC | 10-bit, up to 12 channels |
| DAC | 2 x 10-bit |
| Op Amps | 2 on-chip |
| Comparators | 2 |
| Timers | 8-bit TMR0, 16-bit TMR1, 8-bit TMR2 |
| PWM | 4 x 10-bit PWM |
| Zero Cross Detect | Yes |
| Internal Oscillator | 32 MHz HFINTOSC, 16 MHz MFINTOSC, 31 kHz LFINTOSC |
| UART/SPI/I2C | 1 x EUSART, 2 x SPI, 2 x I2C (MSSP) |
| Core Independent Peripherals | CLC, COG, NCO, ZCD |
| Peripheral Pin Select (PPS) | Yes |
| XLP Sleep Current | 20 nA typical (per Microchip datasheet) |
| Operating Temperature | -40 C to +85 C (industrial) |
| Package | 20-pin SSOP (5.30 mm body width) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (per Microchip packaging profile) |
| RoHS Status | Compliant |
PIC16LF1709T-I/SS Pin Configuration
| Pin 1 | RA5 — Digital I/O / analog input |
| Pin 2 | RA4 — Digital I/O / analog input |
| Pin 3 | RA3/MCLR — Digital I/O / Master Clear (reset) |
| Pin 4 | RC5 — Digital I/O / analog input |
| Pin 5 | RC4 — Digital I/O / analog input |
| Pin 6 | RC3 — Digital I/O / analog input / SCL |
| Pin 7 | RC2 — Digital I/O / analog input / SDA |
| Pin 8 | RC1 — Digital I/O / analog input / op-amp output |
| Pin 9 | RC0 — Digital I/O / analog input / op-amp in |
| Pin 10 | RA2 — Digital I/O / analog input / DAC1 |
| Pin 11 | RA1 — Digital I/O / analog input / ICSPCLK |
| Pin 12 | RA0 — Digital I/O / analog input / ICSPDAT |
| Pin 13 | VDD — Positive supply (1.8 V to 3.6 V) |
| Pin 14 | VSS — Ground |
| Pin 15 | RA7 — Digital I/O / oscillator / ZCD |
| Pin 16 | RA6 — Digital I/O / oscillator |
| Pin 17 | RC7 — Digital I/O / RX/DT |
| Pin 18 | RC6 — Digital I/O / TX/CK |
| Pin 19 | RC5 — Digital I/O / analog input |
| Pin 20 | RC4 — Digital I/O / analog input |
Typical Applications
PIC16LF1709T-I/SS is suitable for 6 applications: TRIAC Light Dimmer with Zero Cross Detect, Battery-Powered Sensor Front End, Capacitive Touch Human Interface, Portable Consumer Wearable, Industrial Sensor Transmitter (4-20 mA / 0-10 V), Small DC Motor / Solenoid Driver.
TRIAC Light Dimmer with Zero Cross Detect
The PIC16LF1709T-I/SS is well suited to mains TRIAC dimmer front-ends because its built-in Zero Cross Detect (ZCD) peripheral detects mains zero crossings in hardware, while the Complementary Output Generator (COG) produces phase-angle gate pulses. According to the Microchip datasheet, the on-chip op amp can also be used to bias the ZCD directly from the mains via a few resistors, eliminating a separate zero-cross optocoupler and reducing BOM cost. The 1.8 V to 3.6 V supply range lets the same MCU be powered from a small capacitive dropper supply on the AC line, while 32 MHz CPU speed is fast enough for phase-angle resolution of 1 percent or better at 50/60 Hz.
Recommended
Battery-Powered Sensor Front End
The PIC16LF1709T-I/SS is an excellent choice for low-power sensor conditioning: its two on-chip op amps can buffer and amplify a thermistor, load cell or strain-gauge bridge, while its 10-bit ADC digitises the result and its 10-bit DAC generates bias or excitation. Per the Microchip datasheet, XLP sleep current is 20 nA typical, allowing years of operation from a CR2032 cell. The 1.8 V to 3.6 V supply range aligns directly with single-cell Li-ion or two-cell alkaline stacks, and the Core Independent Peripherals (CLC, NCO) can wake the core on threshold crossings without CPU involvement.
Recommended
Capacitive Touch Human Interface
The PIC16LF1709T-I/SS supports capacitive touch sensing through its on-chip comparators, CLC and timer-based charge-transfer scanning, all without external touch ICs. According to the Microchip datasheet, the mTouch capacitive sensing library allows the device to implement 8-12 button or slider channels on the 20-SSOP pinout, with the CLC handling wake-on-touch while the core is asleep to preserve XLP budgets. The 10-bit DAC can drive guard patterns, and the 32 MHz clock speeds up scan rates for low-latency user feedback.
Recommended
Portable Consumer Wearable
The PIC16LF1709T-I/SS suits fitness bands, smart watches and wearable accessories that need a low-voltage MCU with a small footprint. Per the Microchip datasheet, the 20-SSOP body (5.30 mm wide) and 17 usable I/O pins fit behind an OLED or BLE module header, while the 14 KB Flash supports lightweight RTOS kernels or state-machine firmware. XLP sleep current of 20 nA lets the device stay quiescent between sensor samples, and the 32 MHz instruction budget handles BLE event servicing and display refresh without bottleneck.
Recommended
Industrial Sensor Transmitter (4-20 mA / 0-10 V)
The PIC16LF1709T-I/SS can implement a smart industrial sensor transmitter with on-board op-amp signal conditioning, 10-bit ADC digitisation, and PWM or DAC output driving a 4-20 mA or 0-10 V analog loop. Per the Microchip datasheet, the CLC and NCO peripherals can synthesise the loop drive waveform in hardware, freeing the CPU for calibration and diagnostics. The industrial -40 C to +85 C operating temperature range and SSOP package support mounting in harsh field enclosures.
Recommended
Small DC Motor / Solenoid Driver
The PIC16LF1709T-I/SS integrates 4 x 10-bit PWM channels plus the COG peripheral, making it a good fit for driving small brushed DC motors, solenoids, valves and fans in appliances or industrial equipment. According to the Microchip datasheet, COG can produce complementary PWM with programmable dead-band for H-bridge control, while the on-chip op amp implements closed-loop current sense without external components. The 32 MHz instruction rate supports fast current-loop control bandwidth and field-oriented control basics.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LF1709T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LF1709-I/SS | PIC16F1709T-I/SS | PIC16LF1719T-I/SS | PIC16LF1559T-I/SS | PIC16LF1579T-I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same |
| Operating Voltage | 1.8 V to 3.6 V (LF) | 1.8 V to 3.6 V | 2.3 V to 5.5 V (F) | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
| Flash Program Memory | 14 KB | 14 KB | 14 KB | 28 KB | 7 KB | 14 KB |
| Data SRAM | 1024 B | 1024 B | 1024 B | 2048 B | 512 B | 1024 B |
| Data EEPROM | 128 B | 128 B | 128 B | 256 B | 64 B | 128 B |
| On-Chip Op Amps | 2 | 2 | 2 | 3 | 2 | 1 |
| Zero Cross Detect / COG | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes | Yes / No | No / No |
| XLP Sleep Current (typ) | 20 nA | 20 nA | 50 nA (F process) | 20 nA | 20 nA | 20 nA |
Key Differentiators
- On-chip op amp + DAC + ZCD trio in a low-voltage XLP MCU (vs PIC16LF1509-I/SS)
- Sub-3 V low-voltage operation for single-cell Li-ion / coin-cell designs (vs PIC16F1709T-I/SS)
- Configurable Logic Cell (CLC) for hardware-only event handling (vs PIC16LF1559T-I/SS)
Design Notes
Estimated: at VDD = 3.3 V and CPU idle with 32 MHz running, IDD is approximately 4 mA per Microchip datasheet. With a 3.3 V supply and a 4 mA active current, power budget is around 13 mW. Place a 100 nF decoupling capacitor as close as possible to the VDD pin and a bulk 10 uF tantalum/ceramic at the regulator output. For XLP designs, switch to LFINTOSC (31 kHz) before issuing SLEEP to keep sleep current under 1 uA.
In a 20-SSOP package the theta-JA is approximately 95 C/W on a JEDEC EIA/JESD51 4-layer test board, per Microchip packaging profile. Estimated: at 3.3 V and 4 mA active, the device dissipates 13 mW, yielding a junction temperature rise of about 1.2 C above ambient - well below limits. In sealed enclosures with no airflow, verify with a thermal probe during worst-case firmware execution.
Route the ICSPDAT/ICSPCLK pins (RA0/RA1) away from PWM outputs to avoid noise coupling during in-circuit serial programming. For ZCD applications, keep the AC mains sense resistor trace short and surrounded by ground pour, and place a 100 nF X7R capacitor directly at the ZCD pin to filter RF noise from the AC line. Maintain a continuous ground plane under the SSOP body and avoid routing analog signals under digital switching traces.
Do not apply 5 V to a PIC16LF1709T-I/SS - the LF process is 1.8 V to 3.6 V only and the part will be damaged. Always configure unused I/O pins as outputs driven low (not high-impedance) to minimize sleep current leakage. When migrating from PIC16F1709 firmware, watch for differences in PPS mapping and register definitions across the F/LF process boundary.
Compliance Information
RoHS / REACH compliant per Microchip product page. Standard industrial (-I/-E) grade only - no AEC-Q100 automotive qualified variant available.
