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Maxim公司的MAXREFDES82#是新一代工业用智能力传感器,3D人接口输入,高精度重量度量,集成了低功耗24位模数转换器(ADC),主要用在3D人接口输入设备,电池为能源的仪表以及工业控制和测量.本文介绍了MAXREFDES82#主要特性,MAXREFDES82#参考设计框图,电路图和PCB元件布局图.
Maxim’s MAXREFDES82# features a next generation industrial, smart force sensor. Mounted on a quadrant of load cells channeled into a multi-channel, 24-bit analog-to-digital converter (ADC), MAXREFDES82# senses weight and center of mass for objects placed on the platform. The scale provides full-scale responses up to 780g. The user interface provides an active display of center of mass on the platform, as well as total measured weight. In addition to serving as a smart force sensor, the design works very well as a ruggedized touch interface with force sensing. The system consumes less than 50mA during normal operation and features a USB interface for quick evaluation and integration.
The board is designed in a compact form factor for rapid evaluation or installation. Refer to the Details tab for more information on the reference design. Design files and firmware can be downloaded from the Design Resources tab.
MAXREFDES82#主要特性:
3D Human Interface Input
High Precision Weigh Scale
Low Power ADC
Compact
Competitive Advantages
Rugged, Cost Effective, Flexible 3D Human-Interface Input Device
High Precision, High Resolution Measurements
Fast, Low-Power Data Acquisition
MAXREFDES82#应用:
3D Human Interface Input Device
Battery-Powered Instrumentation
Industrial Control and Measurement
MAXREFDES82#参考设计
Technology marches forward, constantly and irrepressibly>
This reference design is an industrial, smart force sensor. The design measures mass, as well as the center of mass of the object on it. This combination of features and speed means that MAXREFDES82# operates as both a weigh scale and a touch interface with force sensing. Built with a plastic plate, the system>
The reference design features the MAX11254 24-bit, 6-channel, 64ksps delta-sigma ADC with SPI interface. Four load cells are mounted on a quadrant plane to detect touch forces applied on the flat plastic plate. Based on the forces applied on each individual load cell, the system displays the total force magnitude, and the coordinates of the force center. The force magnitude and coordinates are scanned approximately each 10 milliseconds.
The system includes a thin-film-transistor (TFT) liquid crystal display (LCD) module, digitally showing the forces on each individual load cell, and the total force applied on the top plate. The LCD module also graphically displays the force magnitude and the coordinates of the force center.
The MAXREFDES82# reference design consumes minimal energy and is powered by a USB port. A PC-side graphical user interface (GUI) program is also included to facilitate the human interface input demonstration and development.
The MAXREFDES82# reference design block diagram demonstrates how a touch force and its movement are captured and used in a 3-dimensional (3D) human-interface input device. The design includes source files for the microcontroller to enable developers to quickly evaluate and customize the design for their specific applications with minimal firmware or hardware changes. The board is designed in a compact form factor for rapid evaluation or installation.
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图1.MAXREFDES82#参考设计外形图
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图2.MAXREFDES82#参考设计框图
Detailed Description of Hardware
Figure 2 shows the MAXREFDES82# reference design system block diagram. Figure.3 shows the assembly view of the design. Also refer to the schematic for circuit details.
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图3.MAXREFDES82#参考设计装配图
When a touch force or weight contacts the surface of the top plate, the four strain-gauge load cells deform and output electrical signals to the MAX11254 ADC. Based on the distribution of the force to the four load cells, the system calculates the total force and the position of the force’s center of mass. The system continuously scans the signal output of each of the four load cells, and an accurate force and its movement map can be acquired. Because the system gathers and monitors not only the force position, but also the force magnitude, the system is>
The reset switch (SW1) resets the board, and the calibration switch is used to start a calibration procedure.
The red light-emitting diode (LED) indicates the power supply is good. The flashing green LED indicates the ADC is converting.
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图4.MAXREFDES82#参考设计电路图(1)
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图5.MAXREFDES82#参考设计电路图(2)
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图6.MAXREFDES82#参考设计电路图(3)
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图7.MAXREFDES82#参考设计电路图(4)
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图8.MAXREFDES82#参考设计电路图(5)
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图9.MAXREFDES82#参考设计电路图(6)
MAXREFDES82#参考设计材料清单:
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图10.MAXREFDES82#参考设计PCB元件布局图
详情请见:
https://www.maximintegrated.com/en/design/tools/appnotes/6266/MAXREFDES82_SCH_RA.pdf
和https://www.maximintegrated.com/en/design/tools/appnotes/6266/MAXREFDES82_LAYOUT_RA.pdf
![]() MAXREFDES82_BOM_RA.pdf
![]() MAXREFDES82_LAYOUT_RA.pdf
![]() MAXREFDES82_SCH_RA.pdf
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发表于 2016-7-1 14:36:38
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