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MCP42100-I/SL

Dual 8-bit 100kOhm digital pot, SPI, 256-tap, shutdown, daisy-chain, SOIC-14

7600

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制造商零件：

MCP42100-I/SL

包装：

SOIC-14 (8.65 x 3.90 x 1.27 mm)

说明

产品概览

The MCP42100-I/SL from Microchip Technology is a dual-channel 8-bit (256-tap) digital potentiometer with 100 kOhm end-to-end resistance and SPI interface in a 14-pin SOIC package. It features less than 1 uA static current, +/-1 LSB INL/DNL, and shutdown mode for maximum power savings.

主要规格

Resolution	8-bit (256 taps)
渠道	2 (dual)
Resistance	100 kOhm
Tolerance	+/-30%
Interface	SPI (Mode 0,0 and 1,1)
Bandwidth (-3dB)	145 MHz typical
电源电压	2.7 V to 5.5 V
Static Supply Current	1 uA max
工作温度	-40°C to +85°C

特点

Dual independent potentiometer channels in one package
256-position resolution with +/-1 LSB INL and DNL
Linear taper with potentiometer or rheostat configuration
Software shutdown disconnects A terminal and connects wiper to B
Hardware SHDN pin for shutdown control
Hardware reset (RS) pin returns wiper to mid-scale (80h)
Multiple devices can be daisy-chained via SO pin
Channel-to-channel resistance matching < 1%

应用

Audio volume and tone control
Servo-motor control and battery charging
Programmable filters and gain adjustment
LCD contrast and brightness control

产品介绍：MCP42100-I/SL 产品介绍

The MCP42100-I/SL from Microchip Technology is a dual-channel 8-bit digital potentiometer with 100 kOhm end-to-end resistance and an SPI serial interface in a 14-pin SOIC package. Each of the two independent channels provides 256 tap positions with linear taper, allowing the wiper position to be set with +/-1 LSB integral and differential nonlinearity. The device operates from a single 2.7 V to 5.5 V supply and consumes less than 1 uA in static operation, making it ideal for battery-powered applications. A software shutdown feature disconnects the A terminal from the resistor stack and simultaneously connects the wiper to the B terminal, while the hardware SHDN pin provides the same function externally. The RS (reset) pin returns both wipers to the mid-scale position (80h) on power-up or when asserted. The SPI interface includes both SI (serial input) and SO (serial output) pins, enabling daisy-chaining of multiple MCP42XXX devices for systems requiring more than two potentiometer channels. The channel-to-channel resistance matching is within 1%.

工作原理：MCP42100-I/SL 工作原理

The MCP42100-I/SL operates through three functional blocks: (1) The SPI interface receives 16-bit command words (8-bit command + 8-bit data) through the SI pin. The command byte selects the channel and operation (write data, shutdown, or no operation), while the data byte sets the wiper position (00h to FFh). The SO pin shifts out data from the internal registers, enabling daisy-chaining of multiple devices where data is clocked through one device to the next. (2) Each potentiometer channel consists of a 255-element resistor string with CMOS switches connected to each tap point. The wiper register value selects which tap is connected to the PW terminal. The resistance between PA and the wiper varies linearly with the register value. In shutdown mode, the PA terminal is disconnected and the wiper is connected to PB. (3) The control logic decodes the command byte and routes the data byte to the selected channel’s wiper register. The hardware RS pin resets both wiper registers to 80h (mid-scale), and the SHDN pin forces both channels into shutdown simultaneously. Wiper position changes occur on the rising edge of CS.

引脚说明：MCP42100-I/SL 引脚定义和功能

针脚编号.	引脚名称	功能
1	PB0	Channel 0 terminal B
2	PA0	Channel 0 terminal A
3	VDD	Supply voltage (2.7-5.5 V)
4	PW0	Channel 0 wiper
5	VSS	地面
6	CS	Chip select (active low)
7	SCK	Serial clock
8	SI	串行数据输入
9	SO	Serial data output (daisy-chain)
10	RS	硬件复位（低电平有效）
11	SHDN	Hardware shutdown (active low)
12	PW1	Channel 1 wiper
13	PB1	Channel 1 terminal B
14	PA1	Channel 1 terminal A

Application Scenarios:In which products and applications isMCP42100-I/SL 中古

Audio equipment volume and tone control where dual channels provide left/right balance adjustment via SPI with less than 1% channel matching
Programmable filter and oscillator circuits where 145 MHz bandwidth and 256-tap resolution enable precise frequency and Q-factor tuning
Battery charger current and voltage regulation using the digital potentiometer to set feedback dividers under microcontroller control
LCD contrast and brightness control in embedded displays where the shutdown mode reduces power consumption when the display is off

Alternative Models:What chips are recommended as replacements for MCP42100-I/SL

模型	品牌	渠道	Resistance	包装
MCP42100T-I/SL	微型芯片	2	100 kOhm	SOIC-14
MCP4251-104-E/SL	微型芯片	2	100 kOhm	SOIC-14
AD5262BRUZ100	ADI	2	100 kOhm	TSSOP-14
MAX5494ETE+T	马克西姆	2	100 kOhm	TQFN-16
X9C103S8IZ	Intersil	1	10 kOhm	SOIC-8

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