PIC12LF1840-I/SN - 8-bit 32MHz XLP MCU, 7KB Flash, 8-SOIC | Microchip
MPN: PIC12LF1840-I/SN ✓ Hoạt độngPIC12LF1840-I/SN Tóm tắt
An 8-bit microcontroller is a small computing-on-a-chip device that executes instructions on 8-bit data words; it sits within the broader taxonomy of microcontroller -> embedded controller -> semiconductor. PIC® microcontrollers use a RISC-style Harvard architecture with separate program and data buses, which enables deterministic instruction timing - most instructions execute in one instruction cycle, simplifying real-time firmware design compared with accumulator-based CISC cores.
Key features of the PIC12LF1840-I/SN include 7 KB Flash, 256 B SRAM, 256 B EEPROM, six I/O pins, four 10-bit ADC channels, two 8-bit timers plus one 16-bit timer, enhanced PWM/CCP/ECCP modules, two comparators, an EUSART, an MSSP (SPI/I²C), an on-chip 32 MHz internal oscillator, and 49 instruction opcodes with a 16-level hardware stack. Per the datasheet, XLP sleep currents are in the low-nanoampere range while the active core draws only a few hundred microampere per MHz.
Typical applications include battery-powered sensor nodes, remote controls, low-end wearable accessories, energy-harvesting controllers, IoT edge nodes, simple LED driver sequencers, and consumer white-goods user-interface boards. The wide 1.8–3.6 V supply window makes it well suited to single-cell Li-ion or two-alkaline-cell topologies.
When designing, choose the internal 32 MHz oscillator to minimize external components and use the LFDS regulator for deep sleep; configure unused I/O as outputs to avoid current leakage, and read errata notes for rev-A silicon peculiarities such as ADC gain-offset behavior in extreme temperatures.
Bộ thay thế dễ dàng lắp đặt cho PIC12LF1840-I/SN — 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 PIC12LF1840-I/SN (cùng hình factor và footprint) — khác nhau ở Package, ADC, MSL Level, Operating Temperature, I/O Pins.
PIC12LF1840-E/SN
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC12LF1840T-I/SN
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC12F1840-I/SN
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC12F1840T-I/SN
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC12LF1822-I/SN
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC12LF1572-I/SN
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC12LF1840-I/SN Tỷ lệ tối đa & tính chất điện
| Architecture | PIC enhanced mid-range 8-bit RISC |
| Instruction Set | 49 instructions, 16-level hardware stack |
| Core Frequency (max) | 32 MHz (8 MIPS) |
| Program Memory (Flash) | 7 KB (4K x 14) |
| SRAM | 256 B |
| EEPROM | 256 B |
| Supply Voltage Range | 1.8 V to 3.6 V (LF variant) |
| I/O Pins | 6 |
| ADC | 10-bit, 4 channels |
| Timers | 2x 8-bit, 1x 16-bit |
| PWM / CCP | ECCP + 2 CCP, 10-bit PWM |
| Communication | EUSART (LIN-capable), MSSP (SPI / I²C) |
| Comparators | 2 |
| Internal Oscillator | 31 kHz LF + 32 MHz HF, ±1% calibrated |
| XLP Sleep Current | nanoWatt range (low nA) |
| Nhiệt độ hoạt động | -40 °C to +85 °C (industrial, 'I') |
| Hộp | 8-pin SOIC (SN, 3.90 mm body) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 (unlimited floor life per JEDEC J-STD-020) |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC12LF1840-I/SN
| Chân 1 | RA5 — Bidirectional I/O; analog input channel 4 |
| Chân 2 | RA0 — Bidirectional I/O; analog input channel 0; ICSPDAT |
| Chân 3 | RA1 — Bidirectional I/O; analog input channel 1; ICSPCLK |
| Chân 4 | RA2 — Bidirectional I/O; analog input channel 2; comparator output |
| Chân 5 | RA3/MCLR/VPP — Bidirectional I/O / master clear reset (configurable weak pull-up) / programming voltage |
| Chân 6 | RA4 — Bidirectional I/O; analog input channel 3; T0CKI clock input; comparator input |
| Chân 7 | VDD — Positive supply voltage (1.8 V to 3.6 V) |
| Chân 8 | VSS — Ground reference |
Ứng dụng tiêu biểu
PIC12LF1840-I/SN phù hợp cho 7 Áp dụngs: Battery-Powered IoT Sensor Node, Remote Control / IR Transmitter, Wearable Fitness / Health Band Controller, Industrial Sensor Transmitter, Smart Home / Building Automation End Node, Automotive Interior Accessory Controller, Consumer White Goods User Interface.
Battery-Powered IoT Sensor Node
The PIC12LF1840-I/SN's XLP nanoWatt sleep current and 1.8 V operation make it ideal for coin-cell IoT sensor nodes that spend 99 % of the time asleep. Placed at the heart of a wireless sensor tag with an MSSP-controlled I²C temperature/humidity sensor and an EUSART-driven sub-GHz radio, the device wakes briefly to digitise the sensor, transmits a burst, and returns to deep sleep - drawing single-digit microampere average current. The 32 MHz core is fast enough to run simple on-device calibration routines between transmissions. Its 7 KB Flash accommodates application firmware plus a small RTOS or state machine, while 256 B of EEPROM stores calibration constants across battery replacements. Designers should configure all unused I/O as outputs low to eliminate floating-pin leakage paths in the sub-3 V coin-cell envelope.
Được đề xuất
Remote Control / IR Transmitter
The PIC12LF1840-I/SN is well suited to infrared remote controls thanks to its internal 32 MHz oscillator (no crystal required), 6 I/O pins, and EUSART-driven PWM/CCP that generates precise 38 kHz / 56 kHz carrier waveforms with no external timing components. Connected to a few push-buttons, an IR LED driver transistor, and a CR2032 coin cell, the device runs for years on standby thanks to its nanoWatt sleep mode. Its on-chip EUSART plus timers allow NEC, RC5 or SIRC protocol stacks to be implemented in 7 KB of Flash with room left for custom button mappings. Industrial temperature range plus the LF low-voltage supply ensure stable performance down to the battery's end-of-life voltage around 2.0 V, maximising usable cell capacity.
Được đề xuất
Wearable Fitness / Health Band Controller
The PIC12LF1840-I/SN powers entry-level wearable bands by combining a 10-bit ADC for heart-rate / motion sensing, an EUSART to drive a Bluetooth Low Energy module, and XLP sleep currents that extend a 100 mAh Li-Po battery into weeks of runtime. Housed in a small SOIC-8 footprint, the device fits alongside the BLE SoC on a wristband PCB while its 1.8-3.6 V supply operates directly from the Li-Po charger output. The 10-bit PWM drives vibration motor alerts; 256 B of EEPROM retains step counts and last-used profile through battery swaps; and the calibrated 32 MHz internal oscillator avoids external crystals, reducing BOM cost and PCB area. Use the LFDS regulator and configure the deep-sleep wake-up source to a pin-change interrupt for lowest quiescent draw.
Được đề xuất
Industrial Sensor Transmitter
In industrial 4-20 mA loop or low-voltage bus transmitters, the PIC12LF1840-I/SN digitises a bridge sensor via its 10-bit ADC, applies linearisation in firmware, and drives an EUSART HART or RS-485 output. The -40 to +85 °C industrial temperature range handles factory-floor thermals; the 1.8 V operation suits loop-powered designs with an internal shunt regulator. The 7 KB Flash stores calibration tables and Modbus or HART command interpreters, while the on-chip ECCP PWM can generate a 4-20 mA loop-current reference using a single external op-amp. Pair the PIC with a small TVS protection diode to meet IEC 61000-4-2 ESD on the field-side pins; the SOIC-8 footprint is compatible with hand-rework for prototype retrofitting in legacy 8-pin sensor sockets.
Được đề xuất
Smart Home / Building Automation End Node
The PIC12LF1840-I/SN serves as a low-cost end node in smart-home networks - driving relays, reading temperature set-points, and communicating via EUSART-controlled RS-485 or sub-GHz radios. Its MSSP supports SPI sensors and I²C EEPROM storage for configuration backup. Power is supplied from a 3.3 V LDO or directly from two AA cells, taking advantage of the 1.8-3.6 V LF supply range. The PIC's 16-bit timer captures time-of-day events, and the comparators monitor battery voltage without waking the core. The 7 KB Flash accommodates small Zigbee or LoRaWAN MAC stacks; the 8-pin SOIC package keeps the node footprint below 1 cm², ideal for behind-wall mounting boxes. The device's nanoWatt sleep supports battery-powered window-sensor or doorbell deployments lasting several years.
Được đề xuất
Automotive Interior Accessory Controller
Although not AEC-Q100 qualified by default, the PIC12LF1840-I/SN is widely used in non-safety automotive interior accessories such as ambient lighting, USB chargers, and door-moduled keypads. Its industrial temperature range handles cabin thermal swings; its PWM/ECCP drives LED strings or small DC fans; and the MSSP communicates with body-control modules via LIN-capable EUSART. The 1.8-3.6 V supply operates from the 12 V battery after a small LDO; the 7 KB Flash stores custom lighting sequences, while 256 B of EEPROM retains user preferences across battery disconnects. Pair it with an external CAN/LIN transceiver for body-network nodes; its SOIC-8 package simplifies mechanical mounting and through-hole rework on service-bench fixtures.
Được đề xuất
Consumer White Goods User Interface
The PIC12LF1840-I/SN powers the user-interface boards of white goods such as coffee machines, microwaves, dishwashers, and washing machines. The 10-bit ADC reads rotary encoders and temperature probes, the PWM drives beepers or triac-based heater elements, and the EUSART/MSSP talks to main control boards over UART or I²C. The SOIC-8 footprint fits behind a 7-segment display PCB; the LF 1.8 V supply operates from a small switching supply or capacitive dropper. The 7 KB Flash supports multi-stage cooking programs with EEPROM-stored favourite settings, while XLP sleep keeps standby power below 0.5 W to comply with energy-efficiency regulations. The calibrated 32 MHz internal oscillator eliminates external crystals and reduces EMI.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC12LF1840-I/SN — 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 | PIC12LF1840-E/SN | PIC12F1840-I/SN | PIC12LF1822-I/SN | PIC12LF1572-I/SN |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 8-SOIC (SN, 3.90 mm) | 8-SOIC (SN, 3.90 mm) - same | 8-SOIC (SN, 3.90 mm) - same | 8-SOIC (SN, 3.90 mm) - same | 8-SOIC (SN, 3.90 mm) - same |
| Flash Memory | 7 KB | 7 KB | 7 KB | 3.5 KB (-50 %) | 3.5 KB (-50 %) |
| Supply Voltage Range | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 2.3 V to 5.5 V (mismatched) | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
| Core Frequency (max) | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| I/O Pins | 6 | 6 | 6 | 6 | 6 |
| ADC | 10-bit, 4 ch | 10-bit, 4 ch | 10-bit, 4 ch | 10-bit, 4 ch | 10-bit, 4 ch |
| EUSART / MSSP | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes | No / Yes (16-bit PWM) |
| Temperature Range | -40 to +85 °C (industrial) | -40 to +125 °C (extended) | -40 to +85 °C (industrial) | -40 to +85 °C (industrial) | -40 to +85 °C (industrial) |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B |
Bảo phân biệt quan trọng
- Wider temperature envelope (extended -40 to +125 °C) (vsPIC12LF1840-I/SN (industrial -40 to +85 °C))
- Doubled Flash for firmware headroom (vsPIC12LF1822-I/SN (3.5 KB Flash))
- Low-voltage 1.8 V operation including coin-cell rails (vsPIC12F1840-I/SN (2.3 V min))
- Rich peripheral set in 8-pin SOIC (vsPIC12LF1572-I/SN)
Ghi chú thiết kế
Configure unused I/O pins as outputs driven low to avoid floating-input leakage currents that can reach microampere levels on sub-3 V coin-cell rails. Use the LFDS low-power sleep regulator and select the deep-sleep mode (DSS = 11) to drop quiescent current to single-digit nanoampere range. According to the Microchip datasheet, current consumption in deep sleep is dominated by leakage from I/O and the WDT; disabling the WDT when not needed saves additional nanoampere.
Pin 5 is a multi-function RA3/MCLR/VPP pin; the configuration word MCLRE must be cleared to disable the master-clear reset if RA3 is needed as a regular I/O. Forgetting this keeps the weak pull-up active and can pull high the I/O line, causing unexpected current draw. Also confirm the WDT and code-protection configuration bits match your firmware - locking out debug access is a common prototyping mistake.
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 7) to suppress switching noise from the internal oscillator; add a bulk 10 µF tantalum or ceramic capacitor near the IC for high-current transient events such as radio-module transmissions. Keep the ICSP pins (RA0/RA1, RA3) on accessible PCB test points for in-circuit programming without removing the device from the board.
At 32 MHz, the PIC12LF1840-I/SN draws only a few milliampere from a 3.3 V supply, dissipating under 15 mW - well within the SOIC-8 thermal envelope. No thermal heatsinking is required for normal operation, and the theta_JA of approximately 100-150 °C/W (per Microchip package thermal data) keeps the junction rise below 2 °C even in enclosed industrial housings. Designers do not need to perform thermal analysis for typical low-voltage MCU designs.
When driving an external radio module via EUSART or SPI, add a 33 Ω series resistor close to the PIC output pin to dampen ringing on long PCB traces. The 32 MHz internal oscillator is factory-calibrated to ±1 % but has temperature drift; use the FOSC<FREQ> calibration routine if your application needs accurate UART baud rates over -40 to +85 °C. For sub-1 % timing accuracy, source the system clock from an external crystal or the FOSC = 16 MHz HFINTOSC tuning routine.
Thông tin tuân thủ
RoHS compliant per Microchip product page; lead-free SOIC-8 packaging; standard industrial temperature -40 to +85 °C only - for AEC-Q100 qualified automotive variants consult Microchip automotive product catalogue.
