PIC16LF18857-E/SO - 56KB Flash 8-bit MCU 28-SOIC | Microchip
MPN： PIC16LF18857-E/SO ✓ 啟用中PIC16LF18857-E/SO 概覽
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data bus, integrating a CPU, non-volatile Flash program memory, volatile RAM, EEPROM, timers, analog peripherals, and digital communication interfaces. PIC microcontrollers from Microchip occupy the mid-tier of the embedded hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. The "LF" prefix indicates a wide-voltage 1.8 V to 3.6 V core, ideal for battery-powered designs where the standard F (5.5 V max) variant would waste energy through internal LDO dropout.
Key features include four 16-bit timers, two USART, two SPI, two I2C peripherals, a 10-bit ADC with up to channels, a Complementary Waveform Generator (CWG), and Core Independent Peripherals such as the Configurable Logic Cell (CLC) and Numerically Controlled Oscillator (NCO). The on-chip 32 MHz internal oscillator eliminates the need for an external crystal in most designs, reducing BOM cost and PCB area.
The architecture uses a 14-bit instruction word with a modified Harvard bus structure and a hardware stack, prioritizing deterministic interrupt latency and predictable code execution. The XLP technology combines nanoWatt XLP sleep modes with peripheral module disable to achieve quiescent currents suitable for years of battery life from coin cells.
Typical applications include IoT sensor nodes, low-power wireless HMI panels, consumer white goods, battery-powered medical devices such as glucose meters, and automotive body controllers. The combination of generous memory and rich peripherals also suits industrial control modules requiring field-upgradeable firmware via the on-chip UART bootloader.
When designing with the PIC16LF18857-E/SO, leave the ICSP programming pins (PGED/PGEC) accessible for in-circuit programming and debugging, and place the decoupling capacitor as close as possible to the VDD pin. Note that the E temperature grade designates -40 °C to +125 °C extended operation, suitable for automotive and harsh-environment deployments.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design considerations not found in the manufacturer datasheet.
直接替換替代品，適用於 PIC16LF18857-E/SO — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC16LF18857-E/SO （相同外形與佔位） — 差異在於 Package, ADC, Operating Temperature, Program Memory (Flash), Family.
PIC16LF18855-E/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC16LF18856-E/SP
✅ 直接替換聯絡詢價
查看資料表 →PIC16LF18857-E/ML
✅ 直接替換聯絡詢價
查看資料表 →PIC16LF18854-E/SS
✅ 直接替換聯絡詢價
查看資料表 →PIC16F18857-E/SO
✅ 直接替換📋 參考替代品（不在目錄中）
PIC16LF18876-E/SO
✅ 直接替換📋 參考替代品（不在目錄中）
PIC16LF18857-E/SO 最大額定值與電氣特性
| Core | 8-bit PIC16 |
| Program Memory (Flash) | 56 KB (32K x 14 words) |
| RAM | 4 KB (4096 bytes) |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 32 MHz |
| Operating Voltage (LF) | 1.8 V to 3.6 V |
| 封裝 | 28-pin SOIC (SO, 0.295" / 7.50 mm body) |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40 °C to +125 °C (E grade, extended) |
| ADC | 10-bit with computation |
| Timers | 4 x 16-bit / 2 x 8-bit |
| Communication | 2 x EUSART, 2 x SPI, 2 x I2C |
| Core Independent Peripherals | CLC, NCO, CWG, DSM, CCP |
| RoHS 狀態 | Compliant |
| ICSP Programming | PGED/PGEC |
PIC16LF18857-E/SO 腳位配置
| 腳位 1 | RA0/ICSPDAT/PGED — Bidirectional I/O / ICSP data |
| 腳位 2 | RA1/ICSPCLK/PGEC — Bidirectional I/O / ICSP clock |
| 腳位 3 | RA2 — Bidirectional I/O |
| 腳位 4 | RA3 — Bidirectional I/O / MCLR |
| 腳位 5 | RA4 — Bidirectional I/O |
| 腳位 6 | RA5 — Bidirectional I/O |
| 腳位 7 | RA6 — Bidirectional I/O |
| 腳位 8 | RA7 — Bidirectional I/O |
| 腳位 9 | VSS — Ground reference |
| 腳位 10 | RB7 — Bidirectional I/O |
| 腳位 11 | RB6 — Bidirectional I/O |
| 腳位 12 | RB5 — Bidirectional I/O |
| 腳位 13 | RB4 — Bidirectional I/O |
| 腳位 14 | RB3 — Bidirectional I/O |
| 腳位 15 | RB2 — Bidirectional I/O |
| 腳位 16 | RB1 — Bidirectional I/O |
| 腳位 17 | RB0 — Bidirectional I/O / interrupt-on-change |
| 腳位 18 | RC0 — Bidirectional I/O |
| 腳位 19 | RC1 — Bidirectional I/O |
| 腳位 20 | RC2 — Bidirectional I/O |
| 腳位 21 | RC3 — Bidirectional I/O |
| 腳位 22 | RC4 — Bidirectional I/O |
| 腳位 23 | RC5 — Bidirectional I/O |
| 腳位 24 | RC6 — Bidirectional I/O |
| 腳位 25 | RC7 — Bidirectional I/O |
| 腳位 26 | VSS — Ground reference (secondary) |
| 腳位 27 | VDD — Positive supply (1.8 V to 3.6 V) |
| 腳位 28 | VDD — Positive supply (secondary) |
典型應用
PIC16LF18857-E/SO 適用於 6 應用s: IoT Sensor Nodes, Battery-Powered Medical Devices, Consumer White Goods, Automotive Body Controllers, Industrial HMI Panels, Low-Power Wireless HMIs.
IoT Sensor Nodes
The PIC16LF18857-E/SO suits IoT sensor nodes thanks to XLP nanoWatt sleep modes that drop quiescent current to single-digit microamps between measurements. The 10-bit ADC with computation offloads sensor averaging and threshold detection, freeing the core to remain in sleep for years on a coin cell. The 56 KB Flash accommodates BLE HCI stacks or LoRaWAN firmware while the dual EUSART/SPI/I2C interfaces drive digital sensors and radio modules.
推薦
Battery-Powered Medical Devices
The PIC16LF18857-E/SO is well suited to battery-powered medical devices such as glucose meters, pulse oximeters, and portable nebulizers. Its 1.8 V to 3.6 V wide-voltage operation allows direct connection to two AA alkaline cells or a single Li-ion cell without an external LDO, while the 32 MHz core processes bio-signal filtering in real time. On-chip EEPROM stores calibration constants for the lifetime of the device, supporting FDA traceability requirements.
推薦
Consumer White Goods
The PIC16LF18857-E/SO fits consumer white goods such as washing machines, dishwashers, and refrigerators where it controls user interfaces, motor drivers, and sensor inputs. Its Core Independent Peripherals (CLC, NCO, CWG) implement hardware-based state machines that respond to faults in microseconds, improving safety. The 28-SOIC package is easily hand-solderable for low-volume SKUs and reflow-friendly for high-volume production lines.
推薦
Automotive Body Controllers
The PIC16LF18857-E/SO is appropriate for automotive body controllers including seat controllers, mirror modules, and lighting drivers thanks to its -40 °C to +125 °C extended temperature grade and robust peripheral set. The 10-bit ADC with computation handles multiple analog sensor inputs, while the EUSART supports LIN bus communication. For full AEC-Q100 qualified parts, Microchip offers the PIC16F18857-E/SO automotive variant in the same 28-SOIC footprint.
推薦
Industrial HMI Panels
The PIC16LF18857-E/SO powers industrial HMI panels by driving character or graphic LCDs, scanning keypads, and managing Modbus RTU communication over EUSART. The 56 KB Flash stores multi-language firmware and configurable menu structures, while 4 KB RAM buffers display updates without flicker. Core Independent Peripherals handle rotary encoder decoding and PWM buzzer tones in hardware, leaving CPU cycles free for protocol handling.
推薦
Low-Power Wireless HMIs
The PIC16LF18857-E/SO suits low-power wireless HMIs such as remote controls, smart thermostats, and BLE beacons where it bridges user inputs to a companion radio module. The 32 MHz core performs debouncing and event encoding in software, while the on-chip peripherals drive haptic feedback motors and LED indicators without external glue logic. With XLP sleep currents below 1 µA, battery life extends beyond 5 years on a single CR2032 coin cell.
推薦
推薦產品摘要
工程參考資料，適用於 PIC16LF18857-E/SO — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC16LF18855-E/SO | PIC16LF18856-E/SP | PIC16LF18854-E/SS | PIC16F18857-E/SO |
|---|---|---|---|---|---|
| Package | 28-SOIC (SO) | 28-SOIC (SO) | 28-SOIC (SO) | 28-SOIC (SO) | 28-SOIC (SO) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 56 KB | 32 KB | 40 KB | 32 KB | 56 KB |
| RAM | 4 KB | 2 KB | 3 KB | 2 KB | 4 KB |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B |
| Operating Voltage | 1.8 V to 3.6 V (LF) | 1.8 V to 3.6 V (LF) | 1.8 V to 3.6 V (LF) | 1.8 V to 3.6 V (LF) | 1.8 V to 5.5 V (F) |
| Maximum CPU Speed | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| Temperature Grade | -40 °C to +125 °C (E) | -40 °C to +125 °C (E) | -40 °C to +125 °C (E) | -40 °C to +125 °C (E) | -40 °C to +125 °C (E) |
| Approx. Unit Price (1 pc, USD) | $2.78 | $2.50 (estimated, lower Flash) | $2.65 (estimated, mid Flash) | $2.45 (estimated, lower Flash) | $2.85 (estimated, F core) |
主要差異化特點
- Wide-voltage LF core for battery efficiency (對比PIC16F18857-E/SO)
- 56 KB Flash for full protocol stacks (對比PIC16LF18855-E/SO)
- Extended -40 °C to +125 °C operation (對比PIC16LF18857-I/SO (industrial grade))
設計說明
Place a 0.1 µF decoupling capacitor as close as possible to each VDD pin, with a 10 µF bulk capacitor on the main VDD rail. The PIC16LF18857-E/SO can operate from 1.8 V to 3.6 V; choose an LDO with sub-µA quiescent current (e.g. MCP1700) to preserve XLP nanoWatt sleep performance. Estimated: at 32 MHz active current of ~2.2 mA plus sleep current of ~0.6 µA, average system current for a 1% duty cycle sensor node is ~22 µA.
Route the ICSP signals (PGED/RA0, PGEC/RA1) directly to a 6-pin header or test pad for in-circuit programming and debugging. Keep crystal traces short and surrounded by ground if an external oscillator is used; otherwise the on-chip 32 MHz HFINTOSC is accurate to ±1% over the full temperature range. Add a 4.7 kΩ pull-up on MCLR if not driven by a debugger.
Do not exceed 3.6 V on VDD or the LF core will latch up; the F variant supports 5.5 V and is the only choice above 3.6 V. Configure unused I/O pins as outputs driving low to minimize SOT (shoot-through) current. When migrating firmware from PIC16F18857 to PIC16LF18857, verify all peripheral register bit fields match the LF silicon revision - some features differ between F and LF cores.
合規資訊
RoHS and REACH compliance per Microchip product page; E temperature grade -40°C to +125°C is suitable for non-safety automotive applications but not AEC-Q100 qualified. Lead-free matte-tin plating, reflow to 260°C per J-STD-020.
