MCP42050-E/P - 8-Bit 50k SPI Potentiometer | Microchip
MPN： MCP42050-E/P ✓ 啟用中MCP42050-E/P 概覽
A digital potentiometer is an active analog-input device that replaces a mechanical potentiometer with a resistor network, electronic switches, and a digitally controlled wiper. Within the semiconductor hierarchy, it is a programmable passive-interface component that belongs to the digital potentiometer, resistor-network, and analog-signal-conditioning categories. It allows a controller to adjust resistance, attenuation, gain, offset, or feedback without a mechanical control.
The principal features include 256 linearly selectable taps, 50 kΩ nominal resistance, SPI communication supporting modes 0,0 and 1,1, and maximum integral nonlinearity and differential nonlinearity of ±1 LSB. Low-power CMOS operation includes a maximum static supply current of 1 µA. These characteristics suit compact embedded systems that require software-adjustable analog behavior while preserving a conventional three-terminal potentiometer interface.
Each command selects one of 256 positions, making the wiper useful for coarse resistance adjustment or eight-bit control. The SPI interface reduces external GPIO requirements because the wiper position travels over a serial bus. Because the device contains active circuitry and is powered from the same rail as the controlled system, firmware, clocking, and signal-level sequencing must be coordinated with the surrounding analog circuit.
Typical uses include programmable sensor-conditioning networks, audio attenuation and gain controls, industrial control loops, laboratory equipment, and portable instrumentation. The 2.7 V to 5.5 V supply range supports both 3.3 V and 5 V systems. The linear taper makes the wiper position predictable, while the 14-pin PDIP package supports conventional through-hole prototyping and repair.
When laying out the circuit, keep the wiper connection short and connect the SPI bus so the microcontroller can reinitialize the wiper after reset. Confirm the external circuit’s required resistance and signal swing before treating the nominal 50 kΩ value as a substitute for a mechanical potentiometer. Always observe the absolute maximum supply rating and use the manufacturer’s pin-description table when assigning PCB tracks.
This page combines the manufacturer’s device description with engineering guidance covering SPI integration, resistance selection, signal conditioning, layout, and genuine same-package alternatives. It is designed to support schematic design, firmware implementation, sourcing, and drop-in replacement assessment rather than merely repeat catalog parameters.
直接替換替代品，適用於 MCP42050-E/P — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MCP42050-E/P （相同外形與佔位） — 差異在於 Control Interface, Device Type, Wiper Positions.
MCP42010-E/P
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MCP42020-E/P
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MCP42100-E/P
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MCP42050-E/P 最大額定值與電氣特性
| Device Type | Single-channel digital potentiometer |
| Nominal End-to-End Resistance | 50 kΩ |
| 解析度 | 8 bit |
| Wiper Positions | 256 taps |
| Track Taper | Linear |
| Control Interface | SPI serial interface |
| Supported SPI Modes | Mode 0,0 and Mode 1,1 |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Maximum Static Supply Current | 1 µA |
| Integral Nonlinearity | ±1 LSB maximum |
| Differential Nonlinearity | ±1 LSB maximum |
| 封裝 | 14-pin PDIP |
| 安裝類型 | Through-hole |
MCP42050-E/P 14-pin pdip 腳位配置指南
MCP42050-E/P（14-pin pdip 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： MCP42050-E/P.
請參閱 資料表 以查看完整腳位配置。
典型應用
MCP42050-E/P 適用於 6 應用s: Programmable Sensor Conditioning, Programmable Audio Attenuation, Industrial Control and Setpoint Adjustment, Portable Instrumentation, LED and Lighting Adjustment, Analog Signal-Chain Calibration.
Programmable Sensor Conditioning
The MCP42050-E/P is appropriate for MCU-controlled sensor networks requiring an adjustable attenuation, threshold, offset, or feedback element. Its 50 kΩ network provides 256 linear positions, allowing firmware to establish a starting point and then trim the signal presented to an amplifier or converter. The SPI interface avoids dedicating multiple GPIO lines to position control, while operation from 2.7 V to 5.5 V supports common embedded rails. Because the commanded position is digital but the signal path remains analog, the designer should evaluate wiper impedance, source loading, and noise filtering. A 1 µA maximum static supply current also supports low-power designs that retain the potentiometer while the primary measurement path is inactive.
推薦
Programmable Audio Attenuation
The MCP42050-E/P can implement a digitally controlled attenuation or level-adjustment element in a compact audio control system. Its 8-bit resolution provides 256 linear wiper positions, while the SPI interface lets an MCU change channel gain in response to user input, presets, or automatic leveling. The 50 kΩ nominal resistance is useful when the following stage presents a suitable input impedance, and the 2.7 V to 5.5 V operating range supports 3.3 V or 5 V audio-control hardware. Layout should keep the wiper trace short, place any required anti-alias or reconstruction filtering according to the signal bandwidth, and verify that the output amplifier tolerates the wiper’s effective impedance and any channel-to-channel mismatch.
推薦
Industrial Control and Setpoint Adjustment
The MCP42050-E/P suits industrial and instrumentation systems that need a digitally adjustable setpoint without a mechanical trim control. A controller can select one of 256 wiper positions to influence a limit, threshold, compensation network, or reference-divider output. The 14-pin PDIP package is convenient for equipment that uses through-hole modules, repairable controller boards, or hand-assembled industrial prototypes. SPI modes 0,0 and 1,1 provide flexibility in host-controller configuration. For dependable operation, define the wiper value at startup, prevent writes until the device supply is stable, and include calibration constants that map the commanded code to the required physical control range.
推薦
Portable Instrumentation
The MCP42050-E/P can add user-adjustable calibration or range selection to a portable test and measurement instrument. The 8-bit digital control removes a mechanical potentiometer from the front panel and enables software-controlled presets, while the 1 µA maximum static supply current supports battery-conscious operation when the instrument enters standby. Use the 50 kΩ resistance only when it suitably matches the measured source and input stages, because excessive loading can degrade accuracy. Firmware should restore the wiper after reset and apply stored calibration offsets. A low-noise reference and stable supply are important if the circuit uses the potentiometer to set a precision divider rather than merely controlling a coarse range.
推薦
LED and Lighting Adjustment
The MCP42050-E/P can serve as a programmable control element in LED-driver and lighting systems where an MCU adjusts brightness, current limit, or a feedback setpoint. The 256 linear positions allow smooth stepper-style control from a stored brightness curve, and SPI control simplifies coordination with color channels or lighting presets. The 2.7 V to 5.5 V supply range supports low-voltage controller platforms. Designers should place the wiper within the appropriate feedback or drive path, observe current limits imposed by the surrounding transistors, and account for wiper impedance when driving the reference node. Firmware must avoid abrupt step changes that could produce visible flicker or disturb a regulated LED current loop.
推薦
Analog Signal-Chain Calibration
The MCP42050-E/P is useful in calibration and trim networks where a controller must compensate for component tolerance, sensor offset, or amplifier gain. The linear 50 kΩ element and 256 available codes give engineers a discrete adjustment range that can be searched during production calibration. SPI communication allows the calibration value to be stored in nonvolatile firmware or EEPROM and reapplied after power cycling. For high-accuracy measurements, minimize loading on the wiper and use a high-impedance sensing arrangement so the adjustment mechanism does not degrade source accuracy. The device’s maximum static supply current of 1 µA is beneficial in portable equipment, although dynamic system consumption and external resistor currents can dominate the overall power budget.
推薦
推薦產品摘要
工程參考資料，適用於 MCP42050-E/P — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MCP42010-E/P | MCP42020-E/P | MCP42100-E/P |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 14-pin PDIP | 14-pin PDIP - same package | 14-pin PDIP - same package | 14-pin PDIP - same package |
| Nominal End-to-End Resistance | 50 kΩ | 10 kΩ | 20 kΩ | 100 kΩ |
| Number of Channels | Single channel | Single channel | Single channel | Single channel |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit |
| Wiper Positions | 256 taps | 256 taps | 256 taps | 256 taps |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Control Interface | SPI | SPI | SPI | SPI |
| Track Taper | Linear | Linear | Linear | Linear |
主要差異化特點
- Uses the 50 kΩ nominal resistance required by the target circuit (對比MCP42100-E/P)
- Provides a practical middle resistance within the same package family (對比MCP42020-E/P)
- Retains the same 14-pin PDIP footprint for migration (對比MCP42010-E/P)
設計說明
Route the MCP42050-E/P wiper as a short, quiet analog trace and connect it directly to the receiving amplifier or converter input. Avoid sharing the wiper path with SPI clocking, switching-node connections, or digital return currents. Place the device near the controlled analog node when practical, and use a ground reference that avoids voltage drops beneath the potentiometer. Long traces can add coupling and capacitance that are not represented by the nominal 50 kΩ resistance.
Do not treat MCP42010-E/P, MCP42020-E/P, or MCP42100-E/P as exact substitutes for the 50 kΩ MCP42050-E/P. Their shared 8-bit SPI control and package simplify replacement, but changing from 50 kΩ to 10 kΩ, 20 kΩ, or 100 kΩ alters output loading, available wiper current, attenuation range, and signal-to-noise performance. Recalculate the external circuit and revalidate the analog operating point after any resistance change.
Hold SPI writes until the MCP42050-E/P supply is within its 2.7 V to 5.5 V operating range. Restore the intended wiper code after every controller reset so the analog node cannot remain at an unintended position during startup. The 1 µA maximum static supply current is low, but it does not represent total system consumption; include pull-up resistors, external networks, and dynamic SPI activity when calculating a low-power design’s current budget.
Configure the host SPI peripheral for mode 0,0 or mode 1,1 and keep command timing within the device’s serial-interface limits. Decouple the supply close to the IC and use a quiet analog return path for the wiper node. When the wiper drives a high-impedance input, add capacitance only after considering the intended signal bandwidth; excessive filtering can slow control-loop response, while insufficient filtering can increase noise or instability.
合規資訊
The manufacturer product page and distributor summaries do not state the requested compliance details. AEC-Q100 qualification is not identified for this ordering code.
