PIC16LF18857-I/SO - 56KB Flash 32MHz 8-bit MCU | Microchip
MPN: PIC16LF18857-I/SO ✓ Hoạt độngPIC16LF18857-I/SO Tóm tắt
What is a PIC16 8-bit microcontroller? A PIC16 is Microchip's mid-range 8-bit MCU architecture based on a 14-bit instruction set with a RISC-like Harvard core. PIC16 microcontrollers are used as the central controller in countless embedded products, from industrial sensors to consumer appliances. The XLP designation means this part supports sleep currents in the nanoamp range, deep-sleep retention, and active run currents below 100 uA/MHz, enabling years of battery life on coin-cell or lithium primary cells.
Key features include 256B of EEPROM data memory, 4KB of SRAM, up to 25 channels of 10-bit ADC2, 5-bit DAC, configurable logic cells (CLC), numerically controlled oscillator (NCO), complementary waveform generator (CWG), and zero-cross detect. The Peripheral Pin Select (PPS) allows nearly every digital peripheral to be remapped to a wide range of I/O pins, simplifying PCB routing. Hardware limit timers, windowed watchdog, and cyclic redundancy check (CRC/SCAN) provide functional-safety hooks for IEC 61508 SIL-2 capable designs.
The PIC16LF18857 uses a modified Harvard core with hardware multiplier and 49 instructions, including bit-oriented operations that map cleanly to C-compiled code. With 32MHz internal oscillator accuracy of +/- 1% over the industrial temperature range and 1.8V to 3.6V VDD operation, the device eliminates external crystals in most designs and integrates critical analog directly on-chip, reducing BOM cost.
Typical applications include battery-powered IoT sensor nodes, industrial process transmitters, low-power wireless Mote nodes, consumer white goods, HVAC controllers, medical handheld instruments, and automotive body electronics sub-modules. The 10-bit ADC2 with hardware averaging and oversampling makes it especially useful for bridge-sensor signal conditioning.
When designing with the PIC16LF18857-I/SO, reserve an RC network on MCLR for clean reset, decouple VDD with 100nF + 1uF ceramics, and consult MPLAB Code Configurator (MCC) plug-ins to generate peripheral initialization code. Programming is supported over ICSP using PICkit 4 or MPLAB Snap debuggers, and code may be developed in MPLAB X IDE with XC8 compiler.
Bộ thay thế dễ dàng lắp đặt cho PIC16LF18857-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 PIC16LF18857-I/SO (cùng hình factor và footprint) — khác nhau ở ADC, Package, Core Architecture, Operating Temperature, Program Memory (Flash).
PIC16LF18855-I/SO
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Xem tài liệu →PIC16F18855-I/SO
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Xem tài liệu →PIC16LF18455-I/SO
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Xem tài liệu →PIC16LF18857-I/SO Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16 8-bit RISC (14-bit instructions) |
| Family | XLP (eXtreme Low-Power) |
| Program Memory (Flash) | 56 KB |
| Data Memory (SRAM) | 4 KB |
| Data EEPROM | 256 B |
| CPU Speed | 32 MHz (max) |
| Operating Voltage (VDD) | 1.8 V to 3.6 V |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| ADC | 10-bit ADC2, up to 25 channels |
| DAC | 5-bit DAC |
| EUSART | 2 |
| SPI | 2 (shared with I2C) |
| I2C (MSSP) | 2 |
| Hộp | 28-pin SOIC (SO), 1.27mm pitch |
| Package Dimensions | 17.90 mm x 7.50 mm |
| Peripheral Pin Select (PPS) | Yes |
| Configurable Logic Cells (CLC) | Yes |
| Numerically Controlled Oscillator (NCO) | Yes |
| Complementary Waveform Generator (CWG) | Yes |
| Zero-Cross Detect | Yes |
| Windowed Watchdog Timer | Yes |
| CRC/SCAN | Yes |
| Trạng thái RoHS | Compliant |
| Kiểu lắp đặt | Surface Mount |
Cấu hình chân PIC16LF18857-I/SO
| Chân 1 | MCLR/VPP — Reset input / programming voltage |
| Chân 2 | RA0 — Port A bit 0 (PPS-capable) |
| Chân 3 | RA1 — Port A bit 1 (PPS-capable) |
| Chân 4 | RA2 — Port A bit 2 (PPS-capable, DAC output) |
| Chân 5 | RA3 — Port A bit 3 (PPS-capable) |
| Chân 6 | RA4 — Port A bit 4 / SOSC clock (shared) |
| Chân 7 | VSS — Ground reference |
| Chân 8 | RA5 — Port A bit 5 (PPS-capable) |
| Chân 9 | RA6 — Port A bit 6 (PPS-capable) |
| Chân 10 | RA7 — Port A bit 7 (PPS-capable, oscillator) |
| Chân 11 | VDD — Positive supply (1.8-3.6V) |
| Chân 12 | RB0 — Port B bit 0 (interrupt-on-change) |
| Chân 13 | RB1 — Port B bit 1 (interrupt-on-change) |
| Chân 14 | RB2 — Port B bit 2 (interrupt-on-change) |
| Chân 15 | RB3 — Port B bit 3 (interrupt-on-change) |
| Chân 16 | RB4 — Port B bit 4 (interrupt-on-change) |
| Chân 17 | RB5 — Port B bit 5 (interrupt-on-change) |
| Chân 18 | RB6 — Port B bit 6 (PPS-capable, ICSP clock) |
| Chân 19 | RB7 — Port B bit 7 (PPS-capable, ICSP data) |
| Chân 20 | RC0 — Port C bit 0 (PPS-capable) |
| Chân 21 | RC1 — Port C bit 1 (PPS-capable) |
| Chân 22 | RC2 — Port C bit 2 (PPS-capable) |
| Chân 23 | RC3 — Port C bit 3 (PPS-capable) |
| Chân 24 | RC4 — Port C bit 4 (PPS-capable) |
| Chân 25 | RC5 — Port C bit 5 (PPS-capable) |
| Chân 26 | RC6 — Port C bit 6 (PPS-capable) |
| Chân 27 | RC7 — Port C bit 7 (PPS-capable) |
| Chân 28 | VSS — Ground reference (alternate location) |
Ứng dụng tiêu biểu
PIC16LF18857-I/SO phù hợp cho 6 Áp dụngs: Battery-Powered IoT Sensor Node, Industrial Process Transmitter, Consumer White Goods Control, Medical Handheld Instrument, HVAC Climate Controller, Automotive Body Electronics Sub-Module.
Battery-Powered IoT Sensor Node
The PIC16LF18857-I/SO is well matched to battery-powered IoT sensor nodes thanks to its XLP nanoamp sleep current and 32MHz/8MIPS CPU. With 56KB Flash for application + stack code and 4KB SRAM for buffers, the part can host a lightweight sensor-reading and radio-management routine that pairs with a Sub-GHz or BLE companion IC over one of the two EUSARTs. The 10-bit ADC2 with hardware oversampling can digitize thermistor, photo-diode, or bridge-sensor signals directly, while the CLC and NCO off-load simple signal conditioning from the CPU. Designers typically place the part next to a coin-cell holder and a 32.768 kHz watch crystal on SOSC for RTC tick.
Được đề xuất
Industrial Process Transmitter
For 4-20 mA industrial transmitters, the PIC16LF18857-I/SO's 1.8-3.6V operation fits the loop-side electronics where a zener-regulated rail is standard. The 25-channel 10-bit ADC2 with computation can scan a strain-gauge bridge, RTD, or thermocouple pair with hardware oversampling for 14-bit effective resolution. PPS allows the SPI port to be remapped to clean PCB tracks, isolating the ADC inputs from the noisy digital section. The 256-byte EEPROM stores calibration coefficients, while the windowed WDT and CRC/SCAN support IEC 61508 SIL-2 functional-safety requirements typical of process instrumentation.
Được đề xuất
Consumer White Goods Control
In washing machines, dishwashers, and induction cooktops, the PIC16LF18857-I/SO serves as the main user-interface and appliance controller. The 32MHz core drives the HMI, manages sensor inputs (water level, door switch, temperature NTC), and sequences the motor and heater. The Complementary Waveform Generator (CWG) can synthesize dead-band-corrected switching signals for the motor power stage, and the 5-bit DAC provides a programmable reference for op-amp based current sensing. With 56KB Flash the part absorbs feature-rich application code including inverter V/F control tables.
Được đề xuất
Medical Handheld Instrument
For handheld medical devices like glucose meters, pulse oximeters, and spirometers, the PIC16LF18857-I/SO's low power profile enables weeks of operation on two AAA cells. The 10-bit ADC2 supports thermistor body-temperature sensing and the photo-detector front-end; PPS keeps analog and digital traces separate to preserve SNR. The 256B EEPROM can store patient calibration data, while the CLC implements custom pulse-detection logic that off-loads the CPU. Industrial-grade temperature range (-40C to +85C) supports sterilization environments.
Được đề xuất
HVAC Climate Controller
In HVAC wall thermostats and zoning controllers, the PIC16LF18857-I/SO drives the LCD, reads NTC temperature sensors, manages the scheduler, and controls the contactor or TRIAC for the compressor. The CWG can synthesize zero-cross-switched TRIAC gate pulses for noiseless AC switching, while the NCO can drive a stepper motor for damper control. The two EUSARTs allow Modbus or BACnet communication over RS-485, and the 4KB SRAM is sufficient for schedule storage. PPS simplifies routing on the densely packed thermostat PCB.
Được đề xuất
Automotive Body Electronics Sub-Module
Although the PIC16LF18857-I/SO is not AEC-Q100 qualified by default, it is widely used in non-safety automotive sub-modules such as interior LED drivers, seat-controller keypads, and ambient lighting nodes. The PPS, CLC, and NCO let engineers implement custom LIN-message handling, debounced switch scanning, and PWM color-mixing without glue logic. The PIC16LF18857-E/ML (extended temp) variant is preferred for under-dash deployments; for AEC-Q100 designs, PIC16F18857-I/SO is recommended for 5V rails while ensuring the rest of the BOM is automotive-grade.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LF18857-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 | PIC16LF18855-I/SO | PIC16LF18856-I/SS | PIC16F18857-I/SO | PIC16F18855-I/SO | PIC16LF18455-I/SO |
|---|---|---|---|---|---|---|
| Package | SOIC-28 (SO) | SOIC-28 (SO) - same | SSOP-28 (SS) - same 28-pin count | SOIC-28 (SO) - same | SOIC-28 (SO) - same | SOIC-28 (SO) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 56 KB | 28 KB | 32 KB | 56 KB | 28 KB | 14 KB |
| SRAM | 4 KB | 2 KB | 2 KB | 4 KB | 2 KB | 1 KB |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| CPU Speed | 32 MHz (8 MIPS) | 32 MHz (8 MIPS) | 32 MHz (8 MIPS) | 32 MHz (8 MIPS) | 32 MHz (8 MIPS) | 32 MHz (8 MIPS) |
| Operating Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 1.8 V to 3.6 V |
| ADC Channels | 25 channels 10-bit ADC2 | 24 channels 10-bit ADC2 | 24 channels 10-bit ADC2 | 25 channels 10-bit ADC2 | 24 channels 10-bit ADC2 | 17 channels 10-bit |
| EUSART / I2C / SPI | 2 / 2 / 2 | 2 / 2 / 2 | 2 / 2 / 2 | 2 / 2 / 2 | 2 / 2 / 2 | 2 / 2 / 2 |
| XLP Nanoamp Sleep | Yes | Yes | Yes | Yes (higher than LF) | Yes (higher than LF) | Yes |
Bảo phân biệt quan trọng
- Highest Flash density in PIC16F1885x 28-SOIC family (vsPIC16LF18855-I/SO)
- Lower minimum operating voltage than F-version (vsPIC16F18857-I/SO)
- Most ADC channels in the 28-pin PIC16F1885x family (vsPIC16LF18455-I/SO)
Ghi chú thiết kế
Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of the VDD pin, plus a bulk 1 uF to 10 uF capacitor near the supply trace. The PIC16LF18857 XLP core has a wake-up time of ~1 ms from sleep; if your application cycles rapidly, use IDLE mode rather than full SLEEP. For battery designs on a CR2032 coin cell, the part can run for years at <1% duty cycle, but always include a Schottky diode reverse-protection block to prevent cell leakage during board assembly.
Estimated: route analog ADC inputs (RA0-RA5) with short traces and a guard ring tied to a quiet analog ground island, separated from the digital ground plane by a single bridge under the chip. Place the 32.768 kHz watch crystal as close as possible to RA4/RA5 (SOSC pins) with load capacitors grounded to the same quiet island. Avoid routing high-frequency signals across the analog traces; if PPS is used to remap, document the pin map in MPLAB MCC code for future reference.
Do not exceed the absolute maximum VDD of 4.0 V on the LF part; even brief transients above 3.6 V can corrupt the EEPROM and Flash endurance. The MCLR pin is rated for VDD + 0.3 V max in normal operation; for ICSP programming a VPP of ~8.5 V is applied but only via the Microchip debugger. Watch the I/O source current per pin (25 mA max) and total package dissipation (200 mA max) when driving LEDs - use a current-limit resistor and consider using the CLC + NCO for PWM-driven LED brightness to reduce CPU load.
Thông tin tuân thủ
RoHS compliant per Microchip product page. -I suffix indicates industrial temperature range (-40C to +85C). Not AEC-Q100 qualified; for AEC-Q100 automotive use, choose PIC16F18857-E/ML (extended temp) or move to PIC18F-Q1 family.
