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MAXREFDES9002: C-source Reference for Operating the DS28E18 from Cortex-M4 GPIO Pins

MAXREFDES9002

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描述

The DS28E18 is an easy-to-use bridge integrated circuit (IC) that operates as a 1-Wire® slave device to a host controller. The IC provides a 512-byte command sequencer loaded with commands and control data to operate an I2C or SPI device interfaced to the DS28E18. Once loaded, the host controller sends a 1-Wire command to autonomously execute the sequence, power, and collect data from the attached peripherals. A subsequent 1-Wire command reads the collected data. The power for the attached sensors or peripherals is sourced from the 1-Wire line, enabling a very efficient solution to remotely power and control complex devices such as environmental sensors, analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and display controllers. The MAXREFDES9002 is a reference design showcasing the DS28E18 that demonstrates how to implement a simple 1-Wire master using only a microcontroller’s GPIO pins. To demonstrate this, this reference design provides a GPIO-based 1-Wire library designed for an ARM® Cortex® M4 microcontroller, such as the MAX32660, with example programs for interfacing an I2C or SPI device connected to a DS28E18.

特征

  • Power and communication to I2C and SPI sensors through two wires
  • 512-byte command sequencer for autonomous operation
  • Up to 10mA at 3.3V sensor power derived from 1-Wire
  • Up to 100m distance with the 1-Wire interface
  • Example C-code demonstrates how to interface to I2C and SPI sensors

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Designed, Built, Tested

图中的电路板已经完成封装和测试。不可售。

 

示意图

PCB布局

物料清单(BOM)

Maxim设备 (2)

器件号 名称 产品线 购买 设计套件和评估模块
DS28E18 1-Wire®至I2C/SPI桥接芯片,带指令顺序控制 安全认证器件 立即购买
MAX32660 低功耗Arm Cortex-M4 FPU处理器,带基于FPU的微控制器(MCU),256KB Flash和96KB SRAM 微控制器(MCU) 立即购买

Maxim设备 (2)

器件号 产品线
安全认证器件
1-Wire®至I2C/SPI桥接芯片,带指令顺序控制
微控制器(MCU)
低功耗Arm Cortex-M4 FPU处理器,带基于FPU的微控制器(MCU),256KB Flash和96KB SRAM

设计资料 (3)

标题 类型 尺寸 日期
MAXREFDES9002 BOM XLSX 13KB 2021-04-28
MAXREFDES9002 PCB PDF 578KB 2021-04-28
MAXREFDES9002 Schematic PDF 353KB 2021-04-28
日期 类型
2021-04-28

MAXREFDES9002 BOM

(XLSX, 13KB)

2021-04-28

MAXREFDES9002 PCB

(PDF, 578KB)

2021-04-28

MAXREFDES9002 Schematic

(PDF, 353KB)

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