MCP4451四通道数字电位器开发指南

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"MCP4451是一款由Microchip Technology Inc.生产的数字电位器，具有四电阻网络功能，适用于多种配置，如电位器或 rheostat 模式。这款器件提供了7位和8位两种分辨率选项，分别对应128个和256个电阻步进（或称为tap）。其电阻值可以选择5kΩ、10kΩ、50kΩ或100kΩ。MCP4451具备零标度到全标度的滑动触点操作，拥有低触点电阻（75Ω典型值）和低温度系数，确保了稳定性能。该器件还内置非易失性内存，可以自动回溯保存的滑动触点设置，并有WiperLock技术，以防止意外更改。" "MCP4451采用I2C串行接口，支持100kHz、400kHz和3.4MHz的通信速率，允许高速读写滑动触点以及读写EEPROM。它还提供写保护功能，可以通过硬件WP控制引脚或软件配置位来启用或禁用。此外，有一个终端控制（TCON）寄存器实现电阻网络终端断开功能，以及复位输入引脚。设备还集成了写保护功能，包括硬件和软件两种方式。" "该器件具有棕色脱落复位保护，当电压低于1.5V时启动，以保护设备在电源不稳定时不受损害。在串行接口不活动时，电流消耗仅为2.5uA，这有助于降低系统功耗。MCP4451的这些特性使其成为需要高精度、可编程电阻和低功耗应用的理想选择，如模拟信号调节、音量控制、传感器校准等。" "在实际开发中，为了充分利用MCP4451的功能，开发者需要理解I2C通信协议，掌握如何通过软件控制Wiper位置、设置电阻网络配置以及利用写保护机制。同时，了解器件的电气参数和温度特性对于优化系统设计和保证长期稳定性至关重要。此外，由于MCP4451具备多用途的内存位置，开发者可以利用这些内存存储不同场景下的预设值，提高系统的灵活性。" "在设计电路时，正确连接MCP4451的电源、接地、I2C数据线（SDA和SCL）、控制引脚（如WP和Reset），并注意其电源电压范围，是确保设备正常工作的重要步骤。在编程方面，需要熟悉Microchip提供的库函数或API，以便与MCP4451进行通信，读写其内部寄存器和EEPROM。MCP4451提供了一套强大而灵活的解决方案，适用于需要精确模拟信号控制的各种应用。"

MCP444X/446X

107 T

SU:DAT

Data input setup

time

100 kHz mode 250 — ns Note 2

400 kHz mode 100 — ns

1.7 MHz mode 10 — ns

3.4 MHz mode 10 — ns

109 T

Output valid

from clock

100 kHz mode — 3450 ns Note 1

400 kHz mode — 900 ns

1.7 MHz mode — 150 ns Cb = 100 pF,

Note 1, Note 7

— 310 ns Cb = 400 pF,

Note 1, Note 5

3.4 MHz mode — 150 ns Cb = 100 pF, Note 1

110 T

BUF Bus free time 100 kHz mode 4700 — ns Time the bus must be free

before a new transmission

can start

400 kHz mode 1300 — ns

1.7 MHz mode N.A. — ns

3.4 MHz mode N.A. — ns

Input filter spike

suppression

(SDA and SCL)

100 kHz mode — 50 ns Philips Spec states N.A.

400 kHz mode — 50 ns

1.7 MHz mode — 10 ns Spike suppression

3.4 MHz mode — 10 ns Spike suppression

TABLE 1-3: I

C BUS DATA REQUIREMENTS (SLAVE MODE) (CONTINUED)

C AC Characteristics

Standard Operating Conditions (unless otherwise specified)

Operating Temperature –40°C ≤ T

A ≤ +125°C (Extended)

Operating Voltage V

range is described in AC/DC characteristics

Param.

No.

Sym Characteristic Min Max Units Conditions

Note 1: As a transmitter, the device must provide this internal minimum delay time to bridge the undefined region

(minimum 300 ns) of the falling edge of SCL to avoid unintended generation of START or STOP conditions.

2: A fast-mode (400 kHz) I

C-bus device can be used in a standard-mode (100 kHz) I

C-bus system, but the

requirement t

SU;DAT

≥ 250 ns must then be met. This will automatically be the case if the device does not

stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the SCL signal,

it must output the next data bit to the SDA line

max.+t

SU;DAT

= 1000 + 250 = 1250 ns (according to the standard-mode I

C bus specification) before

the SCL line is released.

3: The MCP44X1/MCP44X2 device must provide a data hold time to bridge the undefined part between V

and V

of the falling edge of the SCL signal. This specification is not a part of the I

C specification, but

must be tested in order to ensure that the output data will meet the setup and hold specifications for the

receiving device.

4: Use Cb in pF for the calculations.

5: Not Tested.

6: A Master Transmitter must provide a delay to ensure that difference between SDA and SCL fall times do

not unintentionally create a Start or Stop condition.

7: Ensured by the T

3.4 MHz specification test.

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