MCP42100-E/P - Dual 100kΩ SPI Digital Potentiometer | Microchip
料号： MCP42100-E/P ✓ 量产中MCP42100-E/P 概述
A digital potentiometer is a programmable passive component that replaces a conventional mechanical potentiometer with internal resistor networks, solid-state switches, and a digital control interface. Its position within the electronics hierarchy is digital potentiometer, programmable passive device, resistor network, and analog signal-conditioning component. Engineers use this category to vary gain, attenuation, reference voltage, feedback, or sensor calibration under software control.
The MCP42100-E/P provides 256 wiper positions for each of its two channels. The 100 kΩ resistance value gives each channel a usable impedance range for many control, gain-adjustment, and analog-calibration circuits. Linear taper makes the relationship between the programmed code and wiper position predictable, while the SPI interface allows a host controller to update resistance without mechanical movement.
The serial interface supports SPI operating modes 0,0 and 1,1. Maximum integral and differential nonlinearity values of ±1 LSB characterize the resolution and linearity of the resistor-array switching network. The 2.7 V minimum and 5.5 V maximum supply limits accommodate common low-voltage embedded systems while supporting higher-voltage logic rails where required by the host controller.
Typical uses include programmable amplifier gain adjustment, sensor-input calibration, audio and communications attenuation, threshold and delay control, and general resistance simulation. A microcontroller can write a new wiper value over SPI, allowing the circuit to adapt to operating conditions without a potentiometer shaft or an analog trimmer.
PCB design should preserve a short SPI route, provide a stable reference and supply decoupling arrangement, and keep sensitive analog nodes away from high-current switching paths. Because the MCP42100-E/P is a passive resistor-network device rather than an active regulator, its supply current is not its defining output rating; the important design limits are voltage, resistance, wiper position, linearity, and interface timing.
This page combines the manufacturer product information, component specifications, package details, sourcing guidance, and practical replacement analysis into a compact engineering reference for selecting and implementing the MCP42100-E/P.
直接替换替代料： MCP42100-E/P ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MCP42100-E/P （相同外形与封装尺寸） ——差异在于 Control Interface, Device Type, Wiper Positions.
MCP42100-I/P
✅ 直接替换联系询价
查看数据手册 →MCP42100-E/P 规格参数
| Device Type | Digital potentiometer |
| Number of Channels | 2 circuits |
| 分辨率 | 8 bit |
| Wiper Positions | 256 taps per potentiometer |
| End-to-End Resistance | 100 kΩ |
| Track Taper | Linear |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Control Interface | Serial SPI |
| SPI Clock Modes | Mode 0,0 and mode 1,1 |
| Integral Nonlinearity | ±1 LSB maximum |
| Differential Nonlinearity | ±1 LSB maximum |
| 封装 | 14-pin PDIP |
| 引脚数量 | 14 pins |
| 安装方式 | Through-hole |
| Wiper Control | SPI-programmable linear position |
MCP42100-E/P 14-pin pdip 引脚配置指南
MCP42100-E/P（14-pin pdip 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： MCP42100-E/P.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MCP42100-E/P 适用于 6 应用s: Programmable Amplifier Gain Control, Sensor Signal Conditioning and Calibration, Communications and Audio Attenuation, Threshold and Delay Adjustment, Instrumentation and Test Equipment, Battery-Powered Embedded Control.
Programmable Amplifier Gain Control
MCP42100-E/P fits gain-setting networks because each of its two channels provides 256 linearly programmed positions across a 100 kΩ resistor. A microcontroller can place the appropriate terminal in the amplifier feedback path and update the wiper over SPI without mechanical adjustment. The ±1 LSB maximum INL and DNL characterize the digital adjustment accuracy, while the 2.7 V to 5.5 V supply range supports embedded control systems. Check the amplifier’s required gain ratio and the wiper’s loading effect before finalizing the external resistor values.
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Sensor Signal Conditioning and Calibration
MCP42100-E/P can adjust the excitation, divider, or feedback resistance used by a sensor interface, allowing a host to compensate for sensor tolerance and system drift. Its 100 kΩ end-to-end resistance is suitable for many divider networks, and the linear taper makes a software-defined calibration curve easier to implement across 256 codes. SPI updates permit slow calibration during operation. The external divider must be designed so loading, wiper resistance, and ±1 LSB nonlinearity do not exceed the measurement accuracy target.
推荐
Communications and Audio Attenuation
MCP42100-E/P provides two independent digitally adjustable 100 kΩ channels for attenuating or setting communication and audio signal levels. SPI control permits rapid level changes from a host controller without relay chatter or potentiometer wear. Each channel resolves 256 positions with linear taper, supporting repeatable menu-driven volume or attenuation tables. The application still requires op-amp buffering when the load is high impedance, and the signal amplitude must remain within the amplifier and resistor network ratings.
推荐
Threshold and Delay Adjustment
MCP42100-E/P is useful when a comparator threshold, timer interval, or oscillator feedback point must be tuned electronically. The 100 kΩ resistance range and 256 linear tap positions allow a controller to trim the circuit without access to a mechanical adjustment point. Because the SPI interface operates in modes 0,0 and 1,1, it integrates with common embedded SPI controllers. Calibration data should be stored in nonvolatile memory when the control state must persist after power cycling.
推荐
Instrumentation and Test Equipment
MCP42100-E/P enables software-selectable resistance in laboratory and industrial test systems where repeatable front-panel calibration is valuable. Two 100 kΩ channels can control separate attenuation, excitation, or reference networks, and 256 taps provide a practical balance between adjustment range and command resolution. The 14-pin PDIP package also simplifies prototyping and through-hole assembly. For precision measurements, validate reference accuracy, resistor tolerance, leakage, and temperature drift across the complete measurement range.
推荐
Battery-Powered Embedded Control
MCP42100-E/P allows a compact embedded product to replace a mechanical trimmer with an SPI-controlled adjustment. Its 2.7 V minimum supply supports low-voltage systems, and the 14-pin PDIP package is straightforward to prototype and inspect during rework. The controller can retain calibration values and update the resistance only when operating conditions change, reducing unnecessary analog activity. Firmware should include code limits and validation to prevent writing an unintended wiper position.
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推荐产品汇总
工程参考数据： MCP42100-E/P ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MCP42100-I/P |
|---|---|---|
| Package | 14-pin PDIP | 14-pin PDIP - same |
| Brand | Microchip Technology | Microchip Technology |
| Number of Channels | 2 circuits | 2 circuits |
| Resolution | 8 bit | 8 bit |
| Wiper Positions | 256 taps per potentiometer | 256 taps per potentiometer |
| End-to-End Resistance | 100 kΩ | 100 kΩ |
| Track Taper | Linear | Linear |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Control Interface | Serial SPI | Serial SPI |
| SPI Modes | Mode 0,0 and mode 1,1 | Mode 0,0 and mode 1,1 |
关键差异点
- Direct same-package replacement path （对比 MCP42100-I/P)
- Dual-channel adjustment in one package （对比 MCP42100-I/P)
- Software-selectable resistance with 256-code resolution （对比 MCP42100-I/P)
设计说明
Route the SPI signals as short, continuous traces and place the device near the controlling microcontroller to reduce propagation delay and coupling. The MCP42100-E/P supports SPI modes 0,0 and 1,1, but the host controller must use the matching clock polarity and phase. Keep the wiper and terminal tracks away from switching nodes and high-current return paths, particularly when the potentiometer controls a high-gain analog stage.
Do not treat the 100 kΩ end-to-end resistance as the usable wiper-output resistance or assume that the full 0-to-100 kΩ range appears directly at the wiper. The effective resistance depends on which terminal is connected to the load and on wiper resistance. In feedback and divider circuits, calculate the gain or attenuation at both travel limits, then verify that the external amplifier and signal source can tolerate the resulting impedance and current.
Buffer the wiper when driving a low-impedance load or sampling the wiper with a high-gain amplifier. Although the device provides 256 linear positions with maximum INL and DNL of ±1 LSB, capacitance at the wiper, leakage, and input bias current can add dynamic error and noise. A nearby buffer or sample-and-hold stage can isolate the resistor network and improve repeatability in instrumentation and communications circuits.
合规信息
The component listings and manufacturer product page do not state the requested compliance attributes. The -E/P suffix must not be interpreted as evidence of AEC-Q100 qualification or lead-free status without a specific manufacturer declaration.