PIC16F1934-I/ML - 8-bit MCU, 7KB Flash, LCD, XLP QFN-44 | Microchip
MPN: PIC16F1934-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.78 | $2.78 |
| 10 | $2.5 | $25.00 |
| 100 | $2.22 | $222.00 |
| 500 | $1.95 | $975.00 |
| 1,000 | $1.74 | $1,740.00 |
PIC16F1934-I/ML Overview
An 8-bit microcontroller (MCU) is a small, self-contained computing device built around an 8-bit data path, an ALU, on-chip program and data memory, and configurable peripherals such as timers, ADC, communication ports, and I/O pins. Within the broader semiconductor hierarchy, MCUs sit under microcontrollers -> embedded processors -> computing semiconductors. Microchip's PIC16 mid-range family is one of the most widely adopted 8-bit platforms, balancing deterministic instruction execution with extremely low sleep current for battery-driven designs.
Key features include 14-bit wide instruction set with 49 instructions, 36 digital I/O pins (exposed on the ML package), a 5-bit DAC, a 10-bit ADC with up to 14 channels, multiple PWM modules, an EUSART, MSSP (SPI/I2C), and four 8-bit timers with two CCP modules. The nanoWatt XLP architecture delivers typical sleep currents below 100 nA, making this part well suited to always-on, energy-harvesting or coin-cell powered products.
Technically, the device uses a Harvard architecture with separate program and data buses, allowing simultaneous fetch and access. The internal 32 MHz oscillator is factory calibrated and eliminates the need for an external crystal in many designs, reducing BOM cost and PCB area. The integrated LCD charge pump supports bias generation for static, 1/2, 1/3, and 1/4 multiplexed displays without external resistor ladders.
Typical applications include low-power LCD-based consumer products such as thermostats, blood pressure monitors, metering displays, sensor readout panels, IoT edge nodes with small graphical displays, and industrial HMI panels. The combination of segmented LCD control, low sleep current, and ample I/O makes it ideal when a full graphical TFT controller would be overkill.
When designing with the ML (QFN-44) variant, attention must be paid to the exposed center pad, which must be soldered to the PCB ground plane for thermal and electrical performance. Programming is supported through Microchip's MPLAB X IDE, XC8 compiler, and the PICkit or ICD debuggers, with a wide ecosystem of application notes and code examples available.
Drop-in alternatives for PIC16F1934-I/ML — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC16F1934-I/ML (same form factor and footprint) — differing in LCD Driver, Package, Timers, Communication, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F1936-I/ML
✅ Drop-In✓ In Stock
$2.15 / Unit
View Datasheet →PIC16F1937-I/ML
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC16LF1934-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F1934T-I/ML
✅ Drop-In✓ In Stock
$1.78 / Unit
View Datasheet →PIC16F1934-E/ML
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16F1934-I/ML Maximum Ratings & Electrical Characteristics
| Architecture | 8-bit PIC16 mid-range Harvard |
| Program Memory (Flash) | 7 KB |
| Data Memory (RAM) | 256 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 32 MHz (8 MIPS) |
| Supply Voltage (Vdd) | 1.8 V to 5.5 V |
| I/O Pins (on ML package) | 36 |
| Package | QFN-44 (ML), 8x8 mm with exposed pad |
| LCD Driver | Up to 192 segments, integrated charge pump |
| ADC | 10-bit, up to 14 channels |
| Timers | 4 x 8-bit Timer0/2 + 2 x CCP |
| Communication | EUSART, MSSP (SPI / I2C) |
| Low-Power Technology | nanoWatt XLP (typical sleep < 100 nA) |
| Operating Temperature Range | -40 C to +85 C (Industrial, -I suffix) |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount |
PIC16F1934-I/ML Pin Configuration
| Pin 1 | RE3/MCLR/VPP — Master Clear (reset) input or programming voltage |
| Pin 2 | RA0/SEG12 — Digital I/O / LCD segment |
| Pin 3 | RA1/SEG7 — Digital I/O / LCD segment |
| Pin 4 | RA2/SEG6 — Digital I/O / LCD segment |
| Pin 5 | RA3/SEG5 — Digital I/O / LCD segment |
| Pin 6 | RA4/SEG4 — Digital I/O / LCD segment |
| Pin 7 | RA5/SEG3 — Digital I/O / LCD segment |
| Pin 8 | RA6/SEG2 — Digital I/O / LCD segment / oscillator |
| Pin 9 | RA7/SEG1 — Digital I/O / LCD segment / oscillator |
| Pin 10 | VSS — Ground |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | RB0/SEG0 — Digital I/O / LCD segment / interrupt |
| Pin 13 | RB1/SEG14 — Digital I/O / LCD segment |
| Pin 14 | RB2/SEG13 — Digital I/O / LCD segment |
| Pin 15 | RB3/CCP2/SEG11 — Digital I/O / CCP2 / LCD segment |
| Pin 16 | RB4/SEG10 — Digital I/O / LCD segment |
| Pin 17 | RB5/SEG9 — Digital I/O / LCD segment |
| Pin 18 | RB6/SEG8 — Digital I/O / LCD segment |
| Pin 19 | RB7/SEG7 — Digital I/O / LCD segment |
| Pin 20 | VSS — Ground |
| Pin 21 | VDD — Positive supply voltage |
| Pin 22 | RC0/SOSCO/T1CKI — Digital I/O / Timer1 clock |
| Pin 23 | RC1/SOSCI/CCP2 — Digital I/O / Timer1 oscillator / CCP2 |
| Pin 24 | RC2/CCP1 — Digital I/O / CCP1 PWM |
| Pin 25 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Pin 26 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Pin 27 | RC5/SDO — Digital I/O / SPI data out |
| Pin 28 | RC6/TX/CK — Digital I/O / EUSART TX / clock |
| Pin 29 | RC7/RX/DT — Digital I/O / EUSART RX / data |
| Pin 30 | VSS — Ground |
| Pin 31 | VDD — Positive supply voltage |
| Pin 32 | RD0/COM3 — Digital I/O / LCD common |
| Pin 33 | RD1/COM2 — Digital I/O / LCD common |
| Pin 34 | RD2/COM1 — Digital I/O / LCD common |
| Pin 35 | RD3/COM0 — Digital I/O / LCD common |
| Pin 36 | RD4/SEG15 — Digital I/O / LCD segment |
| Pin 37 | RD5/SEG16 — Digital I/O / LCD segment |
| Pin 38 | RD6/SEG17 — Digital I/O / LCD segment |
| Pin 39 | RD7/SEG18 — Digital I/O / LCD segment |
| Pin 40 | RE0/SEG19 — Digital I/O / LCD segment |
| Pin 41 | RE1/SEG20 — Digital I/O / LCD segment |
| Pin 42 | RE2/SEG21 — Digital I/O / LCD segment |
| Pin 43 | VLCD1 — LCD charge pump capacitor 1 |
| Pin 44 | VLCD2 — LCD charge pump capacitor 2 |
Typical Applications
PIC16F1934-I/ML is suitable for 7 applications: Battery-Powered Thermostat with LCD, Water/Gas Meter with Segmented LCD Display, IoT Sensor Edge Node with Local Display, Industrial HMI Keypad + LCD Panel, Medical Device Status Display, Consumer Appliance Control Panel, Automotive Dashboard Sub-Display.
Battery-Powered Thermostat with LCD
The PIC16F1934-I/ML is a strong fit for battery-powered thermostats thanks to its integrated LCD driver (up to 192 segments) and nanoWatt XLP sleep current below 100 nA at 1.8 V. The device connects directly to NTC thermistor inputs through its 10-bit ADC, and the wide 1.8-5.5 V supply range lets the same board run from 2x AA alkaline cells or a CR2032 coin cell without level shifting. Compared with a discrete MCU plus external LCD charge-pump solution, this part reduces BOM cost by roughly 30-40% and PCB area by approximately 25%. Typical achievable battery life on 2x AA at 1 sample/minute exceeds 5 years thanks to the sub-microampere sleep current.
Recommended
Water/Gas Meter with Segmented LCD Display
The PIC16F1934-I/ML is well suited for water and gas metering applications because the integrated charge-pump LCD driver eliminates external resistor ladders and supports 1/3 and 1/4 multiplexed displays typical of utility meters. The 256-byte EEPROM stores calibration data with 100K endurance cycles and over 40-year retention, and the device operates from 2 AA cells across the full industrial temperature range. The PIC16F1934-I/ML's four timers and two CCP modules can drive pulse-counting and tamper detection without an external counter IC. With sleep current below 100 nA and active current around 50 uA/MHz, an estimated 10+ year battery life is realistic for slow-rate metering.
Recommended
IoT Sensor Edge Node with Local Display
For IoT edge nodes with a small on-board status display, the PIC16F1934-I/ML provides the lowest-power 8-bit platform with a built-in segmented LCD, leaving the Wi-Fi/BLE radio module to handle communication. The wide 1.8-5.5 V supply range supports both rechargeable Li-Ion and coin-cell operation, and the EUSART plus MSSP (SPI/I2C) interface cleanly connects to popular modules like ESP32 or RN4871. The nanoWatt XLP deep-sleep mode at 100 nA typical lets the node sleep most of the time and only wake on a sensor interrupt, dramatically extending battery life. The integrated 10-bit ADC handles simple analog sensors directly without an external ADC IC.
Recommended
Industrial HMI Keypad + LCD Panel
The PIC16F1934-I/ML fits compact industrial HMI panels where a graphical TFT would be overkill: a 4x4 keypad matrix, status LEDs, and a segmented LCD showing operating mode, setpoints, and alarms. Its 36 I/O pins accommodate key scanning, LED drivers, relay outputs, and RS-485 communication through the EUSART. The 32 MHz CPU executes 8 MIPS, providing fast key debounce and rapid display refresh without flicker. The industrial -40 C to +85 C temperature range and robust peripherals make it suitable for factory-floor equipment, while the 32 kHz Timer1 oscillator supports real-time-clock operation in maintenance-mode displays.
Recommended
Medical Device Status Display
In medical devices such as portable nebulizers, blood pressure monitors, and pill dispensers, the PIC16F1934-I/ML provides a low-power MCU with a built-in LCD that shows pressure readings, dosage count, or scheduling information. The 10-bit ADC acquires sensor signals accurately, and the 256-byte EEPROM logs patient usage data with high endurance. The XLP architecture supports long shelf life on battery power, and the industrial temperature range ensures reliable operation in clinical environments. The integrated charge pump keeps the LCD visible even when the battery is below 2.5 V, improving the user experience at end-of-life.
Recommended
Consumer Appliance Control Panel
The PIC16F1934-I/ML drives consumer appliance control panels including rice cookers, washing machines, and microwave ovens, where a segmented LCD plus tactile keypad provides the user interface and the MCU drives relays, triacs, and buzzer feedback. The 4 timers and 2 CCP modules generate PWM for triac firing and buzzer tones without additional circuitry. Operating from 1.8-5.5 V, the same MCU works in 3.3 V and 5 V designs, simplifying platform reuse across product lines. The wide Flash endurance of 100K erase cycles supports frequent firmware updates during product development.
Recommended
Automotive Dashboard Sub-Display
Although not AEC-Q100 qualified, the PIC16F1934-I/ML in its -E (extended) variant operates across -40 C to +125 C and suits non-safety automotive sub-displays such as HVAC status panels, seat-position indicators, and infotainment auxiliary readouts. The integrated LCD driver reduces the need for a separate display controller, and the high ESD robustness on I/O pins (per Microchip datasheet) helps tolerate the harsh automotive electrical environment. The 32 MHz CPU executes 8 MIPS, supporting smooth button scanning and rapid LCD refresh. The wide Vdd range tolerates load-dump transients when paired with an external automotive regulator.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F1934-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F1936-I/ML | PIC16F1937-I/ML | PIC16LF1934-I/ML | PIC16F1934T-I/ML |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | QFN-44 (ML) | QFN-44 (ML) - same | QFN-44 (ML) - same | QFN-44 (ML) - same | QFN-44 (ML) - same |
| Program Memory (Flash) | 7 KB | 14 KB | 14 KB | 7 KB | 7 KB |
| RAM | 256 bytes | 512 bytes | 1 KB | 256 bytes | 256 bytes |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Supply Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 3.6 V | 1.8 V to 5.5 V |
| Maximum CPU Speed | 32 MHz / 8 MIPS | 32 MHz / 8 MIPS | 32 MHz / 8 MIPS | 32 MHz / 8 MIPS | 32 MHz / 8 MIPS |
| LCD Driver | Up to 192 segments | Up to 192 segments | Up to 192 segments | Up to 192 segments | Up to 192 segments |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| I/O Pins | 36 | 36 | 36 | 36 | 36 |
Key Differentiators
- Doubles Flash and RAM compared to PIC16F1934-I/ML at identical price band (vs PIC16F1936-I/ML)
- 1 KB RAM version available for stack-heavy applications (vs PIC16F1937-I/ML)
- Low-voltage variant for true 1.8 V battery operation (vs PIC16LF1934-I/ML)
- Extended -40 to +125 C temperature range for harsh environments (vs PIC16F1934-E/ML)
Design Notes
The QFN-44 (ML) package has an exposed thermal pad on the underside that must be soldered to the PCB ground plane for both electrical performance and thermal dissipation. Use at least 8 thermal vias in the center pad connected to an inner ground plane to reduce thermal resistance theta_JB. Recommended land pattern follows the IPC-7351 nominal-density guideline with 0.5 mm pitch and 0.30 mm pad width to avoid solder bridging during reflow.
Place a 0.1 uF decoupling ceramic capacitor as close as possible to each VDD pin (pins 11, 21, 31) and a single bulk 4.7 uF-10 uF tantalum or aluminum polymer capacitor near the MCU. The PIC16F1934-I/ML is sensitive to Vdd ripple during ADC conversions; a star-ground topology where the analog and digital grounds meet only at the MCU VSS pin improves ADC accuracy by 1-2 LSB in noisy environments.
Route the 32.768 kHz crystal traces for Timer1 (RC0/SOSCO and RC1/SOSCI) as short as possible, symmetrically placed, and guarded by a ground ring. Keep digital switching traces (PWM, EUSART) at least 3 mm away from the analog ADC inputs (RA0-RA5) to avoid coupling. When using the integrated LCD driver, separate the LCD segment/comment traces from the high-speed digital signals to avoid display flicker, especially at multiplex ratios above 1/4.
Do not float the MCLR/RE3 pin; tie it to VDD through a 10 kohm pull-up resistor, and add a 100 nF capacitor to ground for reset noise immunity. Ensure the configuration bits (CONFIG1) are correctly set to use the internal oscillator and disable low-voltage programming if not needed - misconfigured CONFIG bits are the most common cause of bricked PIC MCUs. Finally, verify the ADC acquisition time is at least 2 us before starting conversion to avoid inaccurate readings on high-impedance sources.
Estimated: at 32 MHz active current of approximately 5 mA at 3.3 V, the PIC16F1934-I/ML dissipates roughly 16.5 mW. Even with the small QFN package and exposed pad, junction temperature rise above ambient is negligible (under 1 C) thanks to the low operating current. However, in sealed enclosures with no airflow, sustained 100% CPU activity may raise ambient by 5-10 C - design the housing with at least one small ventilation slot if the device runs continuously near maximum load.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified in the -I (industrial) variant; the -E variant is extended-temperature but still not automotive-qualified. Halogen-free and lead-free packaging confirmed on the Microchip PIC16F193X/LF193X datasheet.
