MCP42050-I/P - 50kΩ Dual SPI Potentiometer | Microchip
부품 번호: MCP42050-I/P ✓ 활성MCP42050-I/P 개요
A digital potentiometer is a solid-state resistor whose effective position is represented by an internal tap array and selected through a digital interface. The MCP42050 belongs to the digital potentiometer, programmable resistor, and signal-conditioning IC hierarchy. It replaces a manually adjusted potentiometer where the required resistance value must change under software control while retaining a familiar resistive divider implementation.
The MCP42050-I/P provides two potentiometer circuits, 256 selectable positions per circuit, and linear resistance variation through the 50 kΩ range. Its SPI interface supports deterministic updates from a host microcontroller, while its 2.7 V to 5.5 V operating range covers common embedded and industrial supply levels. The operating temperature range of -40°C to +85°C supports commercial and industrial equipment operating away from extended-temperature environments.
Each channel uses an 8-bit command value to identify the desired tap, allowing approximately 0.4% nominal resolution across 256 positions. The SPI interface enables several devices to share clock and data conductors through chip-select control, which is useful in systems with multiple calibration or attenuation channels. Digital control also improves repeatability and eliminates the mechanical contact noise and wear associated with adjustable analog potentiometers.
Typical applications include programmable amplifier gain control, sensor-signal conditioning, test-equipment calibration, audio attenuation, industrial control loops, and embedded system feedback adjustment. In a gain-control circuit, the microcontroller writes a new tap position while the two potentiometer channels provide complementary or independently adjusted resistance values. The component is especially suitable when frequent adjustment is needed without manual user interaction.
PCB design should keep the SPI traces short and provide a solid ground return around the device. Confirm that the selected 50 kΩ resistance and tap topology suit the signal being controlled because the wiper configuration determines whether the part behaves as a rheostat or a voltage divider. Verify the exact pin functions in the manufacturer datasheet before assigning PCB tracks or connecting unused pins.
This product page combines manufacturer specifications, purchasing guidance, package information, and application-focused engineering notes. It also distinguishes genuine pin-compatible alternatives from parts that require a different footprint, helping designers evaluate replacements without introducing an unintended PCB redesign.
드롭인 대체품: MCP42050-I/P — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
MCP42050-E/P
✅ 드롭인 ⚠️ 사양 미검증가격 문의
데이터시트 보기 →MCP42040-I/P
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
MCP42030-I/P
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
MCP42020-I/P
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
MCP42010-I/P
✅ 드롭인 ⚠️ 사양 미검증가격 문의
데이터시트 보기 →MCP42050-I/P 최대 정격 & 전기적 특성
| Device Type | Dual-circuit digital potentiometer |
| Number of Circuits | 2 circuits |
| 분해능 | 8 bits |
| Number of Taps | 256 taps |
| End-to-End Resistance | 50 kΩ |
| Resistance Taper | Linear |
| Serial Interface | SPI |
| 동작 공급 전압 | 2.7 V to 5.5 V |
| 동작 온도 범위 | -40°C to +85°C |
| 패키지 | 14-pin PDIP |
| 실장 유형 | Through-hole |
MCP42050-I/P 14-pin pdip 핀 구성 가이드
MCP42050-I/P(14-pin pdip 패키지)의 핀 구성입니다. 핀 번호, 기능, 연결 다이어그램은 제조사 데이터시트에 정의되어 있습니다. 정확한 풋프린트와 솔더링 지침은 해당 문서를 참조하십시오.
다음에 대한 상세 핀아웃 데이터 없음: MCP42050-I/P.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
MCP42050-I/P 적합 용도: 6 애플리케이션s: Programmable Amplifier Gain Control, Sensor Signal Conditioning, Audio Volume and Attenuation Control, Test and Measurement Calibration, Embedded Feedback and Setpoint Adjustment, Communication Equipment Level Control.
Programmable Amplifier Gain Control
The MCP42050-I/P fits programmable amplifier feedback because its two 8-bit channels provide 256 linearly selectable positions across a 50 kΩ resistance range. A controller can use SPI commands to set the feedback ratio without a mechanical adjustment, improving repeatability and allowing calibration during operation. With both channels available, one may control gain while the other supports offset or another attenuation path. Because the nominal resistance is 50 kΩ, the surrounding amplifier topology determines the actual gain range and input impedance. The 2.7 V to 5.5 V operating range accommodates common embedded control systems, while the -40°C to +85°C rating supports industrial equipment when the full resistance and temperature error are included in the design budget.
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Sensor Signal Conditioning
The MCP42050-I/P can condition a sensor signal by placing one 50 kΩ channel in a divider or gain-feedback network and changing the ratio under software control. Its 256 taps give the controller fine adjustment for sensor range, offset, or calibration compensation, while the second channel can implement an independently adjustable signal path. SPI control is useful in industrial equipment because calibration values can be stored and reapplied without manual potentiometer access. Linear tap behavior simplifies firmware calculations, although the host must account for wiper resistance, loading, and temperature-related resistance changes. The 14-pin PDIP package also makes the device convenient for through-hole prototypes and legacy control boards that cannot easily accept a surface-mount footprint.
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Audio Volume and Attenuation Control
The MCP42050-I/P is suitable for digitally controlled audio attenuation or level adjustment because its two 256-tap channels provide fine, repeatable resistance changes and its SPI interface allows rapid coordinated updates. One channel may define the main attenuation ratio while the second handles another gain or balance function. Linear resistance variation is useful when firmware maps tap codes directly to a desired attenuation sequence. Since the nominal resistance is 50 kΩ, the circuit designer must verify that the chosen network presents an acceptable impedance to the preceding amplifier or signal source. The 2.7 V minimum supply voltage also supports integration with embedded audio controllers operating within the component's documented logic and supply constraints.
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Test and Measurement Calibration
The MCP42050-I/P supports programmable test and measurement calibration by replacing a manual resistance adjustment with an SPI-controlled, 256-position element. A controller can apply stored correction values during self-test or establish repeatable limits for reference and attenuation circuits. The 50 kΩ nominal resistance and dual-channel arrangement allow two calibration axes to be handled by one package. Linear tap spacing makes it practical to implement stepped calibration tables, although absolute accuracy depends on resistance tolerance, wiper position, loading, and temperature. The 14-pin PDIP package is particularly useful for laboratory instrument prototypes, legacy instrument boards, and systems assembled through-hole where a compact surface-mount option is not required.
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Embedded Feedback and Setpoint Adjustment
The MCP42050-I/P can implement a digitally adjustable setpoint or feedback element in an embedded control board. Its two independent 256-tap channels permit separate adjustment of a control divider and an auxiliary threshold network, while SPI provides a simple connection to a microcontroller. The controller can compensate for component tolerances, alter operating behavior without potentiometer access, and record the selected positions for diagnostics. With a 50 kΩ nominal resistance, the network can be scaled around the MCP42050-I/P using fixed resistors to obtain the required range. The 2.7 V to 5.5 V supply span supports common embedded rails, and the -40°C to +85°C operating range covers commercial and industrial enclosure conditions.
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Communication Equipment Level Control
The MCP42050-I/P is applicable in communication equipment that needs digitally adjustable termination, attenuation, or feedback resistance. Two channels permit compact implementation of paired level controls without using two separate potentiometer packages, and the SPI bus can update both settings under firmware control. The 256-tap resolution supports fine adjustment, while the 50 kΩ nominal resistance can be combined with surrounding resistors to set the useful operating range. Designers should check the signal amplitude and bandwidth against the device's documented AC and DC characteristics before using the wiper in a precision RF path. The through-hole 14-pin PDIP package is advantageous for legacy line-card or interface boards, while the 2.7 V to 5.5 V range supports typical embedded control voltages.
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추천 제품 요약
엔지니어링 참조 데이터: MCP42050-I/P — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MCP42050-E/P | MCP42040-I/P | MCP42030-I/P | MCP42020-I/P | MCP42010-I/P |
|---|---|---|---|---|---|---|
| Package | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Number of Circuits | 2 circuits | 2 circuits | 2 circuits | 2 circuits | 2 circuits | 2 circuits |
| End-to-End Resistance | 50 kΩ | 50 kΩ | 40 kΩ | 30 kΩ | 20 kΩ | 10 kΩ |
| Number of Taps | 256 taps | 256 taps | 256 taps | 256 taps | 256 taps | 256 taps |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits |
| Serial Interface | SPI | SPI | SPI | SPI | SPI | SPI |
주요 차별점
- Retains the target 50 kΩ resistance when changing temperature grade (vs MCP42050-E/P)
- Provides a 20% lower nominal resistance in the same package (vs MCP42040-I/P)
- Offers higher resistance than the 30 kΩ family option (vs MCP42030-I/P)
- Matches the dual-channel SPI control structure of the 10 kΩ alternative (vs MCP42010-I/P)
설계 노트
Route SPI signals away from sensitive analog inputs and keep the ground return path continuous beneath the device and its supporting network. The MCP42050-I/P uses SPI for tap selection, so clock, data, and chip-select transitions appear on nearby PCB traces. Use a stable ground reference, avoid long parallel runs with switching-clock or wiper-adjacent nets, and follow the manufacturer datasheet's application and layout guidance when positioning input and output filtering components.
Choose the rheostat or voltage-divider configuration deliberately because connecting the wiper differently changes the effective resistance and circuit behavior. For divider use, verify the intended terminal and wiper connections against the datasheet pin table. For rheostat use, determine which end terminal is tied to the wiper and account for the resistance left between the wiper and that terminal. Confirm every track against the exact 14-pin PDIP footprint before fabrication.
Do not assume that any MCP42XXX-I/P is electrically interchangeable with the MCP42050-I/P simply because the PCB footprint matches. The nominal resistance changes from 50 kΩ for the MCP42050-I/P to 40 kΩ, 30 kΩ, 20 kΩ, or 10 kΩ for the listed alternatives. Recalculate divider ratios, feedback gain, loading, wiper current, and calibration tables after any resistance change. The temperature-grade variant must also satisfy the enclosure's thermal requirements.
Evaluate wiper bandwidth and capacitance for the highest control rate or fastest signal passing through the MCP42050-I/P. Although the tap position is digitally selected, the wiper remains a resistive terminal and the external network can form an RC time constant. Use the manufacturer datasheet's AC characteristics to determine whether the selected resistance and signal frequency are appropriate. Add filtering at the affected node when necessary, while accounting for the filter in the control calibration sequence.
규정 준수 정보
The manufacturer product information does not state the requested compliance statuses. AEC-Q100 is not applicable to this general-purpose digital potentiometer, but an automotive design should instead confirm whether an explicitly qualified ordering variant is required.
