PIC16F1938-E/SO - 28KB Flash 8-bit MCU 28-SOIC | Microchip
MPN: PIC16F1938-E/SO ✓ Hoạt độngPIC16F1938-E/SO Tóm tắt
A PIC16F193x microcontroller is an 8-bit CMOS flash MCU built around Microchip's enhanced mid-range core. Within the system hierarchy it sits inside the PIC16 family → PIC® 8-bit MCU → 8-bit microcontroller → microcontroller (MCU) → embedded processing → semiconductor. The on-board LCD segment driver eliminates the need for an external display controller, and the XLP nanoWatt technology allows nanoamp sleep currents, making this category the workhorse of battery-powered human-machine interface designs.
Key differentiating features include nanoWatt XLP sleep current as low as 50 nA typical at 2 V, an integrated charge pump and low-power Timer1 that lets the RTC run from a single 32 kHz crystal while the core sleeps, plus 14-channel 12-bit ADC with internal voltage reference. The LCD driver supports up to 184 segments and runs autonomously, offloading the CPU and enabling pure display-driven products with no additional components. CLC (Configurable Logic Cell), MSSP (SPI/I2C) and EUSART peripherals add flexible mixed-signal integration without external logic.
Architecturally, the device uses a modified Harvard 8-bit RISC core with 49 instructions and a 16-level hardware stack. The internal 32 MHz oscillator, optional PLL and four configurable power-managed modes (Run, Idle, Sleep, Doze) let firmware trade throughput for quiescent draw, which is why the F1938 family dominates low-power metering and wearable applications.
Typical applications include battery-powered utility metering with segment LCD readout, consumer remote controls, home-automation sensor nodes with character displays, low-end white-goods HMIs and PIC-based industrial keypads. The wide 5.5 V tolerance and on-chip LCD bias generation make it a one-chip solution in these products.
A key design trade-off is that the 28-SOIC variant consumes more board area than the equivalent 28-QFN (PIC16F1938-E/ML); for size-constrained designs the ML package is preferred, while the SO remains the easiest to hand-prototype and rework.
Bộ thay thế dễ dàng lắp đặt cho PIC16F1938-E/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 PIC16F1938-E/SO (cùng hình factor và footprint) — khác nhau ở ADC, Operating Temperature, Package, Timers, LCD Driver.
PIC16F1938-I/SO
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Xem tài liệu →PIC16F1938T-I/SO
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PIC16LF1938-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F1939-I/SO
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F1938-E/SO Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit PIC® enhanced mid-range (RISC) |
| Program Memory | 28 KB Flash (16K x 14 words) |
| Data RAM | 1 KB |
| EEPROM | 256 bytes |
| Maximum CPU Clock | 32 MHz |
| Supply Voltage (Vdd) | 2.3 V to 5.5 V |
| I/O Pins | 25 |
| ADC | 12-bit, 17 channels |
| LCD Driver | Up to 184 segments, integrated charge pump |
| Timers | 4 (Timer0/1/2/3/6; 16-bit + 8-bit) |
| Communication | 1x MSSP (SPI/I2C), 1x EUSART |
| Low-Power Technology | nanoWatt XLP (sleep current ~50 nA typical) |
| Hardware Stack | 16-level x 15-bit |
| Nhiệt độ hoạt động | -40 °C to +125 °C (Extended, "E") |
| Hộp | 28-pin SOIC (SO), 7.50 mm body width |
| Kiểu lắp đặt | Surface Mount |
| Lead-Free / RoHS | Yes (Pb-free matte-tin finish) |
| Program Memory Type | Flash |
| Instruction Set | 49 instructions, 14-bit word |
| Internal Oscillator | Yes, 32 MHz selectable |
Cấu hình chân PIC16F1938-E/SO
| Chân 1 | RA0 — PORTA bit 0 / analog channel / LCD segment |
| Chân 2 | RA1 — PORTA bit 1 / analog channel / LCD segment |
| Chân 3 | RA2 — PORTA bit 2 / analog channel / LCD segment |
| Chân 4 | RA3 — PORTA bit 3 / analog channel / LCD segment |
| Chân 5 | RA4 — PORTA bit 4 / T0CKI / LCD segment |
| Chân 6 | RA5 — PORTA bit 5 / LCD segment |
| Chân 7 | RA6 — PORTA bit 6 / LCD segment |
| Chân 8 | RA7 — PORTA bit 7 / LCD segment |
| Chân 9 | Vss — Ground reference |
| Chân 10 | Vdd — Positive supply voltage (2.3 V to 5.5 V) |
| Chân 11 | RB0 — PORTB bit 0 / interrupt-on-change / LCD segment |
| Chân 12 | RB1 — PORTB bit 1 / interrupt-on-change / LCD segment |
| Chân 13 | RB2 — PORTB bit 2 / interrupt-on-change / LCD segment |
| Chân 14 | RB3 — PORTB bit 3 / interrupt-on-change / LCD segment |
| Chân 15 | RB4 — PORTB bit 4 / interrupt-on-change / LCD segment |
| Chân 16 | RB5 — PORTB bit 5 / interrupt-on-change / LCD segment |
| Chân 17 | RB6 — PORTB bit 6 / ICSPCLK / LCD segment |
| Chân 18 | RB7 — PORTB bit 7 / ICSPDAT / LCD segment |
| Chân 19 | Vss — Ground (secondary) |
| Chân 20 | Vdd — Positive supply (secondary) |
| Chân 21 | RC0 — PORTC bit 0 / LCD segment |
| Chân 22 | RC1 — PORTC bit 1 / LCD segment |
| Chân 23 | RC2 — PORTC bit 2 / LCD segment |
| Chân 24 | RC3 — PORTC bit 3 / SCL / LCD segment |
| Chân 25 | RC4 — PORTC bit 4 / SDA / LCD segment |
| Chân 26 | RC5 — PORTC bit 5 / LCD segment |
| Chân 27 | RC6 — PORTC bit 6 / TX / LCD segment |
| Chân 28 | RC7 — PORTC bit 7 / RX / LCD segment |
Ứng dụng tiêu biểu
PIC16F1938-E/SO phù hợp cho 6 Áp dụngs: Battery-Powered Utility Meter with LCD, Consumer Remote Control with IR LED, Home-Automation Sensor Node with Character Display, White-Goods HMI (Washer / Dishwasher Front Panel), Industrial Keypad Controller, Wearable Health Patch.
Battery-Powered Utility Meter with LCD
The PIC16F1938-E/SO is a strong fit for single-cell battery metering because its nanoWatt XLP sleep current of roughly 50 nA typical and integrated charge-pump-backed LCD driver let a multi-year battery life design drive 4-6 digit 7-segment LCDs without an external bias generator. The 25 GPIOs and 12-bit ADC with up to 17 channels handle pulse counting from the metrology front-end while the MSSP SPI port logs to an external EEPROM. Unlike larger ARM Cortex parts, the PIC16F1938-E/SO needs no external supervisor or display driver, shrinking the BOM for residential water, gas and electricity meters.
Được đề xuất
Consumer Remote Control with IR LED
The PIC16F1938-E/SO suits IR remote controls because the 32 MHz core easily generates 38 kHz carrier waveforms via PWM while sleep currents below 1 microamp keep coin cells alive for years. Its 2.3-5.5 V supply accepts a single 3 V CR2032 cell and the internal oscillator eliminates the external resonator, dropping BOM cost. The EUSART plus MSSP let the same firmware host a debug port for factory calibration.
Được đề xuất
Home-Automation Sensor Node with Character Display
The PIC16F1938-E/SO is ideal for Z-Wave/Zigbee thermostat or HVAC sensor nodes that show readings on a small character LCD, since the on-chip LCD driver and integrated voltage reference keep the analog and display sections independent of the host MCU. The 12-bit ADC with internal reference gives accurate temperature and humidity readings, and the CLC peripheral handles wake-up logic without external gates. Wide 5.5 V tolerance permits USB-powered commissioning during factory test.
Được đề xuất
White-Goods HMI (Washer / Dishwasher Front Panel)
White-goods front panels need to drive a 4-6 digit LCD, scan 16-24 keypad buttons and run a small user interface - exactly the workload the PIC16F1938-E/SO was designed for. The 25 GPIOs plus integrated LCD segment driver and integrated weak pull-ups reduce the number of external components; the extended -40 to +125 C temperature grade handles appliance environments. A peripheral pin select module lets designers re-route UART, SPI and I2C to any GPIO, simplifying PCB layout.
Được đề xuất
Industrial Keypad Controller
Factory keypads need robust EMC tolerance and wide temperature operation - both built into the PIC16F1938-E/SO at -40 to +125 C and 2.3-5.5 V. The MSSP SPI port can drive an external keypad encoder, while the CLC peripheral generates debounce and key-release logic in hardware, freeing the CPU. The 1 KB SRAM comfortably holds a small command queue without DMA, and the integrated LCD driver is a free bonus if the panel needs a status display.
Được đề xuất
Wearable Health Patch
Battery-powered wearable patches demand deep sleep currents and a small footprint - the PIC16F1938-E/SO with 50 nA typical sleep draws is well-suited. The 12-bit ADC with internal reference and integrated temperature sensor channels let the firmware measure skin temperature and battery voltage without external analog, while the LCD driver is unavailable in ultra-thin form factors but the chip still serves as the application processor. The 28-SOIC is the easiest package to hand-prototype; for production, migrate to the 28-QFN PIC16F1938-E/ML.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F1938-E/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 | PIC16F1938-I/SO | PIC16F1938T-I/SO | PIC16LF1938-I/SO | PIC16F1939-I/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (7.50 mm) | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same |
| Flash Memory | 28 KB | 28 KB | 28 KB | 28 KB | 16 KB |
| RAM | 1 KB | 1 KB | 1 KB | 1 KB | 512 B |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B |
| Supply Voltage | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 1.8 V to 3.6 V (lower) | 2.3 V to 5.5 V |
| Operating Temperature | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| Maximum CPU Clock | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| LCD Segment Driver | Yes (up to 184 segments) | Yes (same) | Yes (same) | Yes (same) | Yes (similar, fewer exposed segments in 28-SOIC) |
Bảo phân biệt quan trọng
- Extended temperature grade supports -40 C to +125 C operation (vsPIC16F1938-I/SO)
- Higher Flash/RAM headroom than the -1939 sibling (vsPIC16F1939-I/SO)
- Wider supply range than the low-voltage LF variant (vsPIC16LF1938-I/SO)
Ghi chú thiết kế
The PIC16F1938-E/SO nanoWatt XLP modes deliver a typical sleep current of about 50 nA at 2 V with the LCD charge pump disabled, making the device suitable for multi-year battery metering. Always enable the LCD charge pump only while the display is being refreshed and turn it off in deep-sleep to avoid 1-2 microamp standby drain. Configure the BOR and WDT voltages in CONFIG2 to match the battery end-of-life voltage, otherwise the device may brown-out prematurely on weak cells.
Place the 28-SOIC package with 0.1 uF and 10 uF decoupling caps within 5 mm of the Vdd/Vss pairs (pins 10/9 and 20/19). Route the ICSP pins RB6/ICSPCLK (pin 17) and RB7/ICSPDAT (pin 18) to a 0.1 inch header so production firmware programming does not require socket adapters. Keep the analog inputs RA0-RA3 (pins 1-4) short and away from the LCD segment traces to minimize digital switching noise coupling into ADC samples.
Estimated: configure CONFIG1 with FOSC = INTOSC and PLLEN = OFF if the application does not need 32 MHz; otherwise leaving PLLEN enabled at start-up briefly draws 15-20 mA extra. Remember that the PPS module must be unlocked (PPSLOCK = 0x55, 0xAA sequence) before reassigning peripheral outputs to GPIOs - a common cause of seemingly dead SPI or UART pins on first prototype builds.
For LCD-driven designs, route the SEG and COM lines on the opposite side of the PCB from the switch-mode power supply and keep their lengths matched within 5 mm to avoid ghost segments. The PIC16F1938-E/SO has a configurable bias and waveform generator; use the recommended 1/3 bias and 1/4 duty for 4-mux LCD glass and add 100 kohm bias resistors in parallel with each COM line per the datasheet typical application circuit.
Thông tin tuân thủ
RoHS compliant Pb-free matte-tin finish per Microchip product page. Extended (-40 to +125 C) temperature grade is not equivalent to AEC-Q100 automotive qualification; for AEC-Q100 certified parts consult Microchip's PIC16F1938-I/SO automotive product line.
