MCP41100-I/P - 100kΩ 8-Bit SPI Digital Potentiometer | Microchip
MPN: MCP41100-I/P ✓ פעילMCP41100-I/P סקירה
A digital potentiometer is a solid-state resistor whose effective resistance or voltage-divider tap is controlled electronically. The MCP41100 belongs to the digital potentiometer hierarchy, combining a resistor array, switch matrix, wiper circuitry, and serial interface in one integrated circuit. This eliminates moving contacts, improves repeatability, and supports remote configuration through a microcontroller or embedded control system.
The MCP41100-I/P provides 8-bit resolution across 256 positions, a 100 kΩ nominal end-to-end resistance, and SPI control. Its linear wiper characteristic simplifies calculations when the device is used as a voltage divider, a programmable attenuation element, or an adjustable resistance in control and measurement circuits. The 8-bit interface also allows the controller to select a position using an 8-bit command word.
The device uses a 3-wire serial interface compatible with the SPI communication format identified by Microchip for the MCP4XXXX family. The target MCP41100-I/P is supplied in the 8-pin PDIP package, allowing through-hole assembly and prototyping. For compact production boards, the manufacturer also offers MCP41100 variants in surface-mount packages, but those package variants require corresponding land-pattern and assembly changes.
Typical applications include firmware-controlled gain adjustment, sensor calibration, programmable dividers, test and measurement front ends, industrial control boards, and educational prototyping systems. An MCU can update the wiper position while the analog circuit remains electrically isolated from mechanical wear and repeated adjustment.
When laying out the circuit, treat the two resistor terminals as analog nodes and keep the SPI traces away from sensitive wiper and divider outputs. Confirm the programmed endpoint behavior and usable wiper range in the application because digital potentiometers may exhibit endpoint tolerance and wiper nonlinearity. Confirm the exact voltage, current, and temperature limits against the manufacturer datasheet before committing the design to production.
This page combines the manufacturer device description, exact MPN package information, interface characteristics, pin-compatible family candidates, and practical design guidance. It also distinguishes true package-compatible alternatives from surface-mount and other-package variants that cannot replace MCP41100-I/P without PCB changes.
חלופות תחליף ישיר עבור MCP41100-I/P — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם MCP41100-I/P (אותו גורם צורה וטביעת רגל) — שונים ב Device Type, Package, Resolution, Differential Nonlinearity (DNL), End-to-End Resistance.
MCP41100-E/P
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←MCP41110-I/P
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
MCP41150-I/P
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
MCP41100-I/P מפרטים
| Device Type | Single-channel digital potentiometer |
| רזולוציה | 8 bit |
| Number of Wiper Positions | 256 positions |
| Nominal End-to-End Resistance | 100 kΩ |
| Serial Interface | 3-wire SPI |
| Wiper Characteristic | Linear |
| Number of Channels | 1 channel |
| מארז | 8-pin PDIP |
| Package Type | PDIP-8, 0.3-inch plastic DIP |
| סוג הרכבה | Through-hole |
| Static Operation Current | <1 µA |
| Shutdown Feature | Software shutdown disconnects terminal A and connects the wiper to the terminal selected by the datasheet configuration |
מדריך תצורת פינים של MCP41100-I/P pdip-8, 0.3-inch plastic dip
תצורת פינים עבור MCP41100-I/P (מארזת pdip-8, 0.3-inch plastic dip). מספרי פינים, פונקציות ותרשימי חיבורים מוגדרים ב-Datasheet של היצרן. יש לעיין בו לקבלת ה-footprint המדויק והנחיות הלחמה.
אין נתוני פריסת פינים מפורטים עבור MCP41100-I/P.
עיינו ב- גיליון נתונים עבור תצורת פינים מלאה.
יישומים טיפוסיים
MCP41100-I/P מתאים עבור 6 יישוםs: Programmable Voltage Divider, Sensor Calibration and Offset Adjustment, Programmable Gain and Attenuation, LED Current Adjustment, Embedded Test and Measurement, Arduino Prototyping and Education.
Programmable Voltage Divider
The MCP41100-I/P fits a programmable divider because its 100 kΩ resistor network and linear 8-bit wiper provide 256 digitally selectable positions. Connect the two resistor terminals across the divider supply and route the wiper to an ADC or comparator input. The controller can then adjust the division ratio without mechanical wear, although endpoint tolerance, wiper resistance, and ADC input loading should be included in the error budget. Use the manufacturer characteristic curves before treating the 8-bit command as an exact analog ratio.
Sensor Calibration and Offset Adjustment
The MCP41100-I/P can introduce a digitally controlled calibration element in front of a sensor amplifier. Its 256-position, linear wiper lets firmware trim a divider ratio or calibration offset while the MCP41100 handles the analog resistance and the controller handles the adjustment logic. This arrangement is useful when calibration settings must be stored or repeated across multiple boards. Confirm that the 100 kΩ impedance produces acceptable loading and that the wiper output remains within the measurement amplifier's input range.
Programmable Gain and Attenuation
A 3-wire SPI-controlled MCP41100-I/P can be used to trim a feedback network or attenuation path in a signal-conditioning circuit. The 100 kΩ end-to-end resistance supports divider-based implementations, while the 8-bit command provides 256 adjustment steps. The designer should recalculate divider values for the intended impedance and verify the wiper's influence on amplifier input bias, bandwidth, and noise. This is particularly useful where repeated mechanical recalibration would be inconvenient or inconsistent.
LED Current Adjustment
The MCP41100-I/P can control a digitally adjustable resistance in an LED drive circuit when the external transistor and current-sense topology support the wiper's electrical limits. The 100 kΩ digital potentiometer provides 256 positions for gradual brightness or test-current adjustment through SPI. Because the MCP41100-I/P is primarily a resistor-array device, verify its wiper and terminal current ratings, thermal dissipation, and output impedance before placing it directly in a high-current LED path.
Embedded Test and Measurement
The MCP41100-I/P is useful in a microcontroller-based test fixture for generating adjustable divider outputs or simulating a variable resistance. Its 8-bit resolution and 256 positions allow repeatable software-controlled stimulus levels, and the absence of mechanical contacts improves setting consistency between tests. For high-accuracy instrumentation, characterize endpoint error, wiper nonlinearity, leakage, and drift over the intended temperature range. Use a high-impedance measurement input so the 100 kΩ network is not loaded significantly.
Arduino Prototyping and Education
The MCP41100-I/P supports Arduino experiments involving programmable dividers, analog signal adjustment, and digitally controlled resistance. The controller can send an 8-bit wiper command over the 3-wire SPI interface and observe the resulting change with an analog input. The 8-pin PDIP package is convenient for breadboards and through-hole prototypes, although a dedicated MCP41100 module may use a different package and pin arrangement. Confirm the board's voltage limits and wiring sequence before applying power.
נתוני עזר הנדסיים עבור MCP41100-I/P — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | MCP41100-E/P | MCP41110-I/P | MCP41150-I/P |
|---|---|---|---|---|
| Package | 8-pin PDIP | 8-pin PDIP - same package | 8-pin PDIP - same package | 8-pin PDIP - same package |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| End-to-End Resistance | 100 kΩ | 100 kΩ | 10 kΩ | 50 kΩ |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit |
| Wiper Positions | 256 positions | 256 positions | 256 positions | 256 positions |
| Number of Channels | 1 channel | 1 channel | 1 channel | 1 channel |
| Serial Interface | 3-wire SPI | 3-wire SPI | 3-wire SPI | 3-wire SPI |
| Wiper Characteristic | Linear | Linear | Linear | Linear |
| Temperature-Grade Suffix | I/P | E/P - different temperature grade | I/P - same grade | I/P - same grade |
מבדילים עיקריים
- Exact 100 kΩ resistance in a through-hole package (לעומתMCP41110-I/P)
- Temperature-grade flexibility without changing the footprint (לעומתMCP41100-E/P)
- Intermediate resistance option for divider and biasing designs (לעומתMCP41150-I/P)
הערות תכנון
Route the three SPI signals as a compact digital group and connect the ground and supply pins according to the MCP41100 datasheet pin-description table. Keep the resistor-terminal and wiper traces away from clocks, high-current switches, and digital edge crossings. Use a solid ground reference beneath or near the device when the wiper drives an ADC, because analog-divider accuracy can be affected by ground-bounce and supply ripple.
Treat the MCP41100-I/P as an 8-bit programmable resistor, not as a precision 8-bit DAC. The commanded code is digital, but the resulting wiper voltage also depends on endpoint tolerance, wiper resistance, nonlinearity, output loading, and supply stability. For a divider, select a high-impedance ADC or amplifier input and include the MCP41100's wiper impedance in the design calculation. Measure the usable code range during calibration rather than assuming codes 0 and 255 equal the resistor endpoints exactly.
Do not treat the MCP41100-I/SN surface-mount variant as a direct substitute for MCP41100-I/P; the package outlines and PCB land patterns differ. Likewise, changing from 100 kΩ to 10 kΩ or 50 kΩ can alter divider loading, available wiper current, amplifier biasing, and noise even though the SPI command format remains the same. Verify the exact MPN, package, resistance value, temperature grade, operating voltage, and wiper-current requirement before releasing the BOM.
מידע על תאימות
No specific compliance declaration for MCP41100-I/P appears in the product listings. Confirm RoHS, REACH, lead-free, halogen-free, AEC-Q100, and conflict-minerals status using the current manufacturer product documentation or project-specific material declarations.