PIC16LF1938T-I/SO - 8-bit 32MHz XLP MCU 28KB Flash | Microchip
MPN: PIC16LF1938T-I/SO ✓ Hoạt độngPIC16LF1938T-I/SO Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash/ROM), volatile data memory (RAM), EEPROM, and a rich set of peripherals such as timers, ADC, PWM, communication interfaces (UART/SPI/I2C), and I/O. The PIC16F1938/1939 family belongs to the enhanced mid-range 8-bit PIC16 architecture (PIC16 -> 8-bit microcontroller -> microcontroller -> semiconductor), and the 'LF' sub-family adds nanoWatt XLP™ technology — a hardware-based low-power feature set including multiple idle/sleep modes, peripheral module disable, and ultra-low watchdog current for battery-powered applications.
Key features include an integrated LCD driver (up to 4 common, 32 segment drive), a 10-bit ADC with up to 17 channels, two EUSART, two MSSP (SPI/I2C) modules, up to 36 I/O pins, capacitive touch (mTouch) sensing via the CTMU, and an internal 32 MHz oscillator. The 'XLP' designation delivers typical sleep currents below 50 nA and active currents in the single-digit mA range at 1 MHz, allowing years of operation from a CR2032 coin cell when sleep duty cycle is high.
The LF1938 series is built on a 0.18 µm process with a 14-bit instruction word and 8-bit data path. The 28-pin SOIC (SO) variant of the PIC16LF1938T-I/SO shares identical silicon to the 28-pin SSOP (SS), 28-pin QFN (ML), and 28-pin SPDIP (SP) versions, so any PIC16LF1938 firmware image is portable across all four packages without code modification.
Typical applications include battery-powered metering with LCD readout (water/gas/heat meters), wearable health and fitness devices, remote control transmitters, consumer appliances with display, and any product needing 2-cell or single-cell lithium primary operation. Choose the 'LF' sub-family specifically when the design must run below 2.5 V.
When designing with this part, place the VDD/VSS pair pins, the ICSP VPP/PGD/PGC trio, and the external 32.768 kHz crystal (if used for RTCC) per the datasheet reference layout. Use the Capacitive Touch Sensor Add-on board or the PICDEM LCD 2 (DM163030) for evaluation.
This page synthesizes distributor pricing, drop-in alternative inventory from Microchip's own PIC16LF193x family, and design notes that go beyond what is in the datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho PIC16LF1938T-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 PIC16LF1938T-I/SO (cùng hình factor và footprint) — khác nhau ở Package, Timers, ADC, Operating Temperature, Program Memory (Flash).
PIC16LF1938-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF1938T-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF1938T-I/MV
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F1938T-I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LF1937T-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF1936T-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF1938T-I/SO Tỷ lệ tối đa & tính chất điện
| Core | 8-bit PIC enhanced mid-range |
| Series | PIC® 16F XLP |
| Maximum CPU Frequency | 32 MHz |
| Program Memory (Flash) | 28 KB (16K x 14 words) |
| Data RAM | 1 KB |
| EEPROM | 256 B |
| Supply Voltage (LF grade) | 1.8 V to 5.5 V |
| I/O Pins | 36 (varies by package) |
| Hộp | 28-SOIC (SO), 7.50 mm body |
| Operating Temperature (I grade) | -40 °C to +85 °C |
| ADC | 10-bit, up to 17 channels |
| LCD Driver | Up to 4 common / 32 segment |
| Communication Interfaces | 2x EUSART, 2x MSSP (SPI/I2C) |
| Timers | 4 (Timer0/1/2/4/5/6, multiple 8/16-bit) |
| Capacitive Touch | CTMU (mTouch supported) |
| Internal Oscillator | 32 MHz HF + 31 kHz LF |
| Low-Power Technology | nanoWatt XLP |
| Programming/Debug | ICSP via ICD/PICKit |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 (unlimited floor life) |
| Trạng thái RoHS | Compliant |
| Lead-Free / Halogen-Free | Yes / Yes |
Cấu hình chân PIC16LF1938T-I/SO
| Chân 1 | RA0/AN0/C1IN+/C12IN0-/CTMU/RTCC — Bidirectional I/O; analog input 0; comparator 1 input; CTMU pad; RTCC output |
| Chân 2 | RA1/AN1/C1IN-/C12IN1-/CTMU/RTCC — Bidirectional I/O; analog input 1; comparator 1 input; CTMU pad; RTCC |
| Chân 3 | RA2/AN2/VREF-/C2IN+/C1IN+/CTMU — Bidirectional I/O; analog input 2; VREF-; comparator 2 input |
| Chân 4 | RA3/AN3/VREF+/C1IN+/C2IN+/CTMU — Bidirectional I/O; analog input 3; VREF+; MCLR (input only on this pin) |
| Chân 5 | RA4/T0CKI/C1OUT/CCP5 — Bidirectional I/O; Timer0 clock input; comparator 1 output; CCP5 |
| Chân 6 | RA5/AN4/C2OUT/CCP4/SS — Bidirectional I/O; analog input 4; comparator 2 output; CCP4; SPI SS |
| Chân 7 | VSS — Ground reference for logic and I/O |
| Chân 8 | RA7/OSC1/CLKIN — Bidirectional I/O; crystal oscillator input; external clock input |
| Chân 9 | RA6/OSC2/CLKOUT — Bidirectional I/O; crystal oscillator output; clock output |
| Chân 10 | RC0/SOSCO/T1CKI — Bidirectional I/O; Timer1 clock input; secondary oscillator output |
| Chân 11 | RC1/SOSCI/CCP2 — Bidirectional I/O; secondary oscillator input; CCP2 |
| Chân 12 | RC2/CCP1/P1A — Bidirectional I/O; CCP1; PWM 1A output |
| Chân 13 | RC3/SCK/SCL — Bidirectional I/O; SPI SCK; I2C SCL |
| Chân 14 | RC4/SDI/SDA — Bidirectional I/O; SPI SDI; I2C SDA |
| Chân 15 | RC5/SDO — Bidirectional I/O; SPI SDO |
| Chân 16 | RC6/TX/CK/CCP3 — Bidirectional I/O; USART TX/CK; CCP3 |
| Chân 17 | RC7/RX/DT/CCP4 — Bidirectional I/O; USART RX/DT; CCP4 |
| Chân 18 | VSS — Ground reference |
| Chân 19 | RD0/AN20/COM0 — Bidirectional I/O; analog input 20; LCD COM0 |
| Chân 20 | RD1/AN21/COM1 — Bidirectional I/O; analog input 21; LCD COM1 |
| Chân 21 | RD2/AN22/COM2 — Bidirectional I/O; analog input 22; LCD COM2 |
| Chân 22 | RD3/AN23/COM3 — Bidirectional I/O; analog input 23; LCD COM3 |
| Chân 23 | RC4/SDA/SDI (LCD SEG15) — Note: shared with pin 14; LCD segment 15 |
| Chân 24 | RC5/SDO (LCD SEG16) — Note: shared with pin 15; LCD segment 16 |
| Chân 25 | RB0/AN12/SEG0/CCP4 — Bidirectional I/O; analog input 12; LCD SEG0; CCP4 |
| Chân 26 | RB1/AN10/SEG1/C12INT — Bidirectional I/O; analog input 10; LCD SEG1; C12 interrupt |
| Chân 27 | RB2/AN8/SEG2 — Bidirectional I/O; analog input 8; LCD SEG2 |
| Chân 28 | RB3/AN9/SEG3/PGM — Bidirectional I/O; analog input 9; LCD SEG3; PGM (ICSP programming) |
Ứng dụng tiêu biểu
PIC16LF1938T-I/SO phù hợp cho 6 Áp dụngs: Battery-Powered Water/Gas Metering with LCD, Wearable Fitness and Health Bands, Consumer Appliance with LCD Front Panel, Industrial Control Panel HMI with Cap-Touch, Remote Control / RF Transmitter, IoT Sensor Node with Energy Harvesting.
Battery-Powered Water/Gas Metering with LCD
PIC16LF1938T-I/SO fits battery metering applications because it combines an on-chip LCD driver (4 common / 32 segment) that can directly drive the 6-8 digit + icon displays of water/gas meters, a 1.8 V minimum operating voltage for 2-cell alkaline or lithium primary supply, and nanoWatt XLP sleep currents below 100 nA enabling >10 year coin-cell operation. With 28 KB Flash and 1 KB RAM the MCU can host IEC 62056-21 protocol stacks, run an RTCC from a 32.768 kHz external crystal, and capture reed-switch pulse counting simultaneously. Designers should add a 100 nF decoupling cap on each VDD/VSS pair and route the segment traces as a star from the LCD pin group to minimize ghosting, per Microchip datasheet DS40001574.
Được đề xuất
Wearable Fitness and Health Bands
For wearables, PIC16LF1938T-I/SO provides 1.8-5.5 V direct operation from CR2032 coin cells, 32 MHz headroom for sensor sampling, and nanoWatt XLP sleep allowing months of standby life. The CTMU + ADC10 can read resistive temperature sensors, optical pulse oximetry photodiodes, and capacitive touch on the wearable's enclosure through mTouch libraries. The 1 KB RAM supports BLE command queue buffering when paired with a Microchip RN4870 BLE module, and the 256 B EEPROM retains user profiles through battery swaps. Keep active-mode duty cycle below 5% to achieve >6 month battery life from a 240 mAh CR2032 per typical Microchip XLP design notes.
Được đề xuất
Consumer Appliance with LCD Front Panel
PIC16LF1938T-I/SO is well matched to consumer appliances - coffee machines, ovens, washing machines - because the integrated LCD driver eliminates the need for a separate segment driver, the 28 KB Flash comfortably hosts state-machine control firmware, and the industrial -40 to +85 °C I-grade temperature range survives kitchen and laundry environments. The EUSART links to motor controllers or sensor boards, the MSSP drives a memory or display EEPROM, and the 10-bit ADC reads thermistors, level sensors, and humidity sensors. Design tip: place the MCU physically away from heating elements and route VDD/VSS with a star topology to limit temperature-induced ADC drift per datasheet DS40001574.
Được đề xuất
Industrial Control Panel HMI with Cap-Touch
Industrial HMI panels benefit from PIC16LF1938T-I/SO because the CTMU/mTouch peripheral implements up to 17-button capacitive touch through the PCB copper directly, removing mechanical buttons and their failure modes. The 10-bit ADC reads analog sensor inputs, the EUSART links to RS-485 transceivers, and 36 I/O pins drive keypads, indicator LEDs, and relays. With 28 KB Flash the controller can host a state machine plus simple menu logic without an external display controller; the I-grade temperature range handles industrial cabinet environments. Layout: place guard traces around cap-touch pads and use hatched ground fill to avoid false triggers per datasheet DS40001574.
Được đề xuất
Remote Control / RF Transmitter
PIC16LF1938T-I/SO suits handheld remote controls because XLP sleep below 100 nA and 32 MHz active headroom allow multi-year coin-cell operation even with RF transmission bursts. The EUSART or MSSP drives an external 315/433/868/915 MHz OOK/FSK transmitter like the Microchip MICRF112 or compatible SAW-stabilized modules, and the CTMU enables touch buttons without mechanical switches. 28 KB Flash supports rolling-code protocols such as KeeLoq for secure keyfobs. Critical layout: keep the MCU ground clean from RF return currents by using a star ground or split ground plane under the antenna section.
Được đề xuất
IoT Sensor Node with Energy Harvesting
PIC16LF1938T-I/SO enables battery-less IoT sensor nodes paired with a 1.5 V solar or thermal energy harvester because it operates down to 1.8 V and draws sub-100 nA in sleep. The MCU wakes on RTCC, samples a sensor via ADC, transmits on a Sub-GHz radio, and returns to sleep - all within a duty cycle that fits 1-3 mJ daily energy budgets. The 1 KB RAM is sufficient for buffering a handful of sensor packets before transmission. Pair with an energy-harvesting PMIC like the Microchip MCP16411 boost regulator for sub-1 V harvesters, and use the integrated LCD driver for local display of readings.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LF1938T-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 | PIC16LF1938-I/SO | PIC16LF1938T-I/ML | PIC16LF1938T-I/MV | PIC16F1938T-I/SO | PIC16LF1936T-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (SO) 7.50 mm body | 28-SOIC (SO) 7.50 mm body - same | 28-QFN (ML) 6x6 mm - same pinout electrically | 28-UQFN (MV) 4x4 mm - same pinout electrically | 28-SOIC (SO) 7.50 mm body - same | 28-SOIC (SO) 7.50 mm body - same |
| Program Memory (Flash) | 28 KB (16K x 14) | 28 KB | 28 KB | 28 KB | 28 KB | 14 KB (-50%) |
| Data RAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 512 B (-50%) |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| Supply Voltage (min) | 1.8 V (LF grade) | 1.8 V | 1.8 V | 1.8 V | 2.3 V (+27%) | 1.8 V |
| Maximum CPU Frequency | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| Operating Temperature | -40 °C to +85 °C (I grade) | -40 to +85 °C | -40 to +85 °C | -40 to +85 °C | -40 to +85 °C | -40 to +85 °C |
| Unit Price @ 100 (USD) | 3.35 | ~3.40 | ~3.45 | ~3.60 | ~3.15 (-6%) | ~2.95 (-12%) |
Bảo phân biệt quan trọng
- Sub-2.0 V operating capability of the LF silicon sub-family (vsPIC16F1938T-I/SO)
- Integrated LCD driver eliminating external segment driver (vsPIC16LF1936T-I/SO)
- Pin-compatible 28-SOIC and 28-QFN factory variants (vsPIC16LF1938T-I/ML)
- Full nanoWatt XLP peripheral set with RTCC and CTMU (vsPIC16F1938T-I/SO)
Ghi chú thiết kế
Estimate: at 32 MHz active from 5.0 V, PIC16LF1938 draws ~6 mA, dropping to ~0.7 mA at 4 MHz and ~1.0 µA in sleep with RTCC. For a coin-cell CR2032 (~240 mAh, 0.2 mA continuous max) budget 99.9% sleep duty cycle and use XLP sleep mode (not idle) to stay below the 0.2 mA average draw ceiling. Add a 100 nF ceramic + 10 µF bulk tantalum VDD-VSS decoupling pair within 5 mm of pins 18 and 7.
For 28-SOIC (SO) layout, follow JEDEC SOIC-28 land pattern (1.27 mm pitch, ~0.4 mm pad width per IPC-7351 nominal-density). Place the ICSP test pads (PGC, PGD, VPP, VDD, VSS) on the PCB edge as a 1x5 100-mil header compatible with Microchip PICKit 4 ribbon cable - this enables pre-assembly programming and in-field firmware updates without removing the MCU.
Do not pull MCLR/RA3 above VDD by more than 8.5 V or the device enters HV programming mode unexpectedly. Always connect a 10 kΩ resistor between RA3/MCLR and VDD - never drive it directly from a logic output. For cap-touch designs (CTMU), keep analog and digital ground separate on the PCB and join at a single point under the MCU to prevent ground bounce from disturbing CTMU charge measurements.
LCD segment traces should be routed as a star from the SEGO/SEGxx pin group, not bused across the PCB, to prevent ghosting. The 4 COM lines must be software PWM-generated; ensure they are mapped to pins capable of 50 Hz switching with low-impedance drive strength (RC4/RC5 excluded if used for I2C/SPI). For LCD bias stability, route VDD to the internal charge pump regulator via the dedicated LCD bias capacitor pin (C1/C2) with a 100 nF NPO ceramic.
At full 32 MHz active current ~6 mA from 5 V the dissipation is ~30 mW, far below the 28-SOIC thermal limit (~500 mW at room temp). No heatsink is required. However, in sealed enclosures at +85 °C ambient, derate CPU activity to keep junction below +125 °C; this is usually trivial given the low active current. Do not confuse this thermal concern with power semiconductors.
Thông tin tuân thủ
Per Microchip product environmental compliance report; I-grade is industrial (-40 to +85 °C), not AEC-Q100 automotive qualified - choose 'F' or 'E' automotive grade PIC16F1938 variants for automotive use.
