PIC16LF721T-I/SO - 7KB Flash 8-bit MCU | Microchip 20-SOIC
MPN: PIC16LF721T-I/SO ✓ Hoạt độngPIC16LF721T-I/SO Tóm tắt
A microcontroller (MCU) is an integrated circuit containing a CPU core, program memory (Flash/ROM), data memory (RAM), and peripherals such as timers, ADC, communication interfaces, and I/O pins on a single chip. PIC16 microcontrollers sit in the 8-bit RISC segment of the broader microcontroller taxonomy, which itself belongs to the larger power management and embedded control semiconductor family. They are commonly chosen for low-power, deterministic, cost-sensitive embedded designs.
Key features of the PIC16LF721 include 7 KB self-programmable Flash (4K x 14 words), 256 bytes of SRAM, 128 bytes of data EEPROM, 18 I/O pins, an enhanced 8-bit timer (Timer1/2/3) set, a 10-bit ADC with up to 14 channels, capture/compare/PWM modules, an I2C/SPI/USART (AUSART) interface, and nanoWatt XLP technology that drops the typical sleep current below 1 uA. The LF designator means the part is built for 1.8 V minimum operation, allowing direct battery connection in 2x AA / coin-cell designs.
The PIC16LF721T-I/SO uses a Harvard-architecture PIC16 RISC core with a 14-bit instruction word, single-cycle ALU operations, and a hardware multiplier. The LF process node and XLP design deliver active currents around 1 mA/MIPS at 3.3 V and standby currents of roughly 50-100 nA with the watchdog timer disabled, making the device well suited to always-on sensor nodes that spend most of their life in sleep.
Typical applications include battery-powered IoT sensor nodes, low-energy remote controls, wearable health patches, 2.4 GHz RF transmitter companion controllers, low-end motor control, and small consumer appliances. The industrial (-I) temperature grade of -40C to +85C supports outdoor and factory-floor deployment.
When designing, place a 100 nF decoupling capacitor on VDD as close to the pin as possible and bulk-decouple the MCLR line. Configure unused I/O as outputs driven low to minimize current draw in sleep, and use the LF variant only when sub-3.6 V battery operation is required; otherwise, the standard PIC16F721 (up to 5.5 V) provides more supply margin.
This page synthesizes distributor pricing, drop-in alternatives in the same 20-pin SOIC footprint, and practical low-power design notes beyond the datasheet to help engineers select and source the PIC16LF721T-I/SO quickly.
Bộ thay thế dễ dàng lắp đặt cho PIC16LF721T-I/SO — 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 PIC16LF721T-I/SO (cùng hình factor và footprint) — khác nhau ở Package, Operating Temperature, Timers, ADC, Core Architecture.
PIC16LF721-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF720T-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF720-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF721T-I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF721T-I/MV
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LF721T-I/SO Tỷ lệ tối đa & tính chất điện
| Core | PIC16 (8-bit RISC, Harvard) |
| Instruction Word Width | 14-bit |
| Program Memory (Flash) | 7 KB (4K x 14) |
| Data Memory (SRAM) | 256 bytes |
| Data EEPROM | 128 bytes |
| Maximum CPU Speed | 16 MHz instruction rate |
| Internal Oscillator | Up to 32 MHz |
| Supply Voltage Range (LF) | 1.8 V to 3.6 V |
| I/O Pins | 18 |
| Hộp | 20-pin SOIC (SO), 7.50 mm width |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Low-Power Feature | nanoWatt XLP |
| Cấp MSL | 1 (unlimited) |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân PIC16LF721T-I/SO
| Chân 1 | RA2/AN2 — Digital I/O RA2 / ADC analog input AN2 |
| Chân 2 | RA3/AN3/VREF1+ — Digital I/O RA3 / ADC AN3 / positive ADC reference |
| Chân 3 | RA4/AN4 — Digital I/O RA4 / ADC AN4 |
| Chân 4 | RA5/MCLR/VPP — Digital I/O RA5 / Master Clear (reset) / ICSP VPP |
| Chân 5 | VSS — Ground reference |
| Chân 6 | RA6/OSC2/CLKOUT — Digital I/O RA6 / crystal oscillator output / CLKOUT |
| Chân 7 | RA7/OSC1/CLKIN — Digital I/O RA7 / crystal oscillator input / CLKIN |
| Chân 8 | RB4/AN10 — Digital I/O RB4 / ADC AN10 |
| Chân 9 | RB5/AN11 — Digital I/O RB5 / ADC AN11 |
| Chân 10 | RB6/ICSPCLK — Digital I/O RB6 / ICSP clock |
| Chân 11 | RB7/ICSPDAT — Digital I/O RB7 / ICSP data |
| Chân 12 | VDD — Positive supply (1.8 V to 3.6 V) |
| Chân 13 | RA0/AN0 — Digital I/O RA0 / ADC AN0 |
| Chân 14 | RA1/AN1 — Digital I/O RA1 / ADC AN1 |
| Chân 15 | RC0 — Digital I/O RC0 |
| Chân 16 | RC1 — Digital I/O RC1 |
| Chân 17 | RC2/CCP1 — Digital I/O RC2 / CCP1 PWM output |
| Chân 18 | RC3 — Digital I/O RC3 |
| Chân 19 | RC4/SDA/SDI — Digital I/O RC4 / I2C SDA / SPI SDI |
| Chân 20 | RC5/SCL/SCK — Digital I/O RC5 / I2C SCL / SPI SCK |
Ứng dụng tiêu biểu
PIC16LF721T-I/SO phù hợp cho 6 Áp dụngs: Battery-Powered IoT Sensor Node, Low-Energy Remote Control, Wearable Health Patch, Small Consumer Appliance Controller, Automotive Interior LED Controller (Non-Safety), Industrial Sensor / 4-20 mA Loop Peripheral.
Battery-Powered IoT Sensor Node
The PIC16LF721T-I/SO is well suited as the always-on controller in coin-cell or 2x AA sensor nodes because its LF voltage range starts at 1.8 V and nanoWatt XLP sleep current stays below 1 uA. The PIC16 core wakes from sleep in a few instruction cycles, allowing a wake-measure-transmit cycle that consumes only tens of microamp-seconds. The 7 KB Flash holds small BLE/Zigbee stack shims plus sensor drivers, while 256 bytes SRAM is enough for short transmit buffers.
Được đề xuất
Low-Energy Remote Control
In a battery-powered remote control, the PIC16LF721T-I/SO can stay in deep sleep for months, waking on a GPIO interrupt when a button is pressed and then driving an IR LED or 2.4 GHz transmitter. The 18 I/O pins easily accommodate 4x4 matrix keypads plus status LEDs, and the enhanced CCP PWM module can directly generate the 38 kHz carrier for IR transmission. The 1.8 V minimum supply lets a single CR2032 coin cell power the design across its full discharge curve.
Được đề xuất
Wearable Health Patch
The PIC16LF721T-I/SO is an appropriate MCU for disposable or rechargeable wearable health patches because of its sub-microamp sleep current, 1.8 V operating range, and small 20-pin SOIC footprint. It can sample heart-rate or SpO2 sensors periodically using the 10-bit ADC, store calibration in 128 bytes of EEPROM, and wake a Bluetooth Low Energy radio only when a measurement is ready. The industrial -40C to +85C temperature range tolerates body-worn thermal environments.
Được đề xuất
Small Consumer Appliance Controller
For small kitchen or personal-care appliances such as humidifiers, fans, or toothbrush chargers, the PIC16LF721T-I/SO provides enough Flash for state-machine control logic and EEPROM for user settings. The 18 I/O pins drive triac/relay outputs via optocouplers, sense water-level or capacitive touch inputs, and run the PWM fan or heater control loops. The wide -40C to +85C industrial grade handles steamy bathroom and outdoor-equipment environments.
Được đề xuất
Automotive Interior LED Controller (Non-Safety)
In non-safety automotive interior applications such as ambient lighting or dashboard backlight dimming, the PIC16LF721T-I/SO drives CCP PWM channels for smooth color/brightness control while its AUSART links to a body-control CAN bridge. Note that the LF variant runs up to 3.6 V, so for 12 V automotive rails a regulator or LDO is still required. For AEC-Q100-qualified automotive needs, PIC16LF1903T-I/SO or similar PIC16LF1xxx-Q1 parts are recommended instead.
Được đề xuất
Industrial Sensor / 4-20 mA Loop Peripheral
In 4-20 mA loop-powered sensor transmitters, the PIC16LF721T-I/SO's nanoWatt XLP sleep mode stretches loop-current budget during idle telemetry, while its 10-bit ADC directly digitizes sensor bridge outputs. The AUSART links to a HART modem or to a low-power wireless M-Bus radio for retrofit industrial deployments. The industrial -40C to +85C temperature grade supports outdoor and factory-floor use without derating.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LF721T-I/SO — 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 | PIC16LF721-I/SO | PIC16LF720T-I/SO | PIC16LF720-I/SO | PIC16LF721T-I/SS | PIC16LF721T-I/MV |
|---|---|---|---|---|---|---|
| Package | 20-SOIC (SO) | 20-SOIC (SO) - same | 20-SOIC (SO) - same | 20-SOIC (SO) - same | 20-SSOP (different footprint) | 20-UQFN (different footprint) |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Program Flash | 7 KB | 7 KB | 3.5 KB | 3.5 KB | 7 KB | 7 KB |
| Data SRAM | 256 bytes | 256 bytes | 128 bytes | 128 bytes | 256 bytes | 256 bytes |
| Data EEPROM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| Supply Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
| I/O Pins | 18 | 18 | 18 | 18 | 18 | 18 |
| Packaging | Tape & Reel | Tube | Tape & Reel | Tube | Tape & Reel | Tape & Reel |
Bảo phân biệt quan trọng
- Highest flash memory in the PIC16F720/721 20-SOIC family (vsPIC16LF720T-I/SO)
- Sub-3.6 V supply range for coin-cell designs (vsPIC16F721-I/SO (non-LF))
- Tube vs Tape & Reel packaging flexibility (vsPIC16LF721-I/SO)
Ghi chú thiết kế
Estimated: at 3.3 V VDD and 16 MHz Fosc the PIC16LF721T-I/SO active current is approximately 1 mA per MIPS, giving ~4 mA peak and ~1.5 mA average for typical loops. Use a 100 nF ceramic decoupling capacitor on VDD (pin 12) within 5 mm of the IC and add a 10 uF bulk capacitor on the battery rail. For coin-cell designs the LF variant is mandatory; a non-LF PIC16F721 will brown out below 2.0 V.
The 20-SOIC footprint (SO) has a 1.27 mm pin pitch. Always tie MCLR (pin 4) high through a 10 kohm resistor to VDD, or directly to VDD in non-debug builds, with a 100 nF cap to VSS to filter ESD. Place ICSP clock/data test points on RB6/RB7 (pins 10/11) so you can re-program the part on board. Keep the 32 kHz low-power crystal traces short if you use Timer1 sleep ticks.
Common pitfalls: (1) configuring unused I/O pins as analog inputs - they will float and waste current; set them as outputs driven low. (2) Running internal HFINTOSC above the LF spec's 3.6 V VDD limit - this damages the LF oscillator. (3) Forgetting to clear the WDT in long sleep cycles - the LF sleep tick must be < WDT timeout (~2 s typical) or the device will reset instead of sleeping. (4) Using PIC16F721 firmware on PIC16LF721 - the LF variant has reduced oscillator gain at <2 V and may need the LFINTOSC instead of HFINTOSC.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page; AEC-Q100 not qualified for automotive safety. Conflict-minerals compliant per Microchip supplier declaration.
