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Wysłany: Wto 11:35, 04 Sty 2011
Temat postu: Battery automatic detection system of data collect
Battery automatic detection system of data collection
In equal 8.51xs, according to the system design requirements and the needs of conversion accuracy, the system uses multiple channels for channel selection sample selection circuit to extend battery detection channel number. Using the circuit shown in Figure 5. Through the control switch CD4051 multiplexer control terminal A, B, C Tamarix discharge board to select a section of the battery speaking BU line measurement Vol 27 Yu Qin Qiang, Sun Chung, Zhongxing Rong: battery automatic detection system of data collection 372 design issues to note in Figure 5 multi-channel selection circuit detection accuracy of the system determined by the ADS774, ADS774 the design so the design is very important. System according to design requirements are now using ADS774 8-bit analog-digital conversion, have to meet the design requirements, but in order to improve the system in the future development requirements and scalability of the development requirements of the circuit design ADS774 reserved 12 conversion capacity, SCM STC89C516RD + also retained a 4-bit data bit in order to improve the accuracy of future expansion and leave room to enhance the automatic detection system in the future competition ability. On the other hand in order to eliminate interference caused to the system error and eliminate common impedance coupling, to the extent possible to reduce the public part of the impedance of the ground, and the electric circuit to avoid the strong and weak common ground circuits,
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, digital circuits and analog circuits common ground. The ADS774 analog to (9 feet) and the circuit board analog ground connection; digital ground (15 feet) and digital ground connections,
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, and use the cable as short as possible. In order to eliminate the interference, the system uses two-layer board,
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, the circuit board in the ground mesh cloth, and can effectively reduce the ground impedance, reduce unnecessary errors. ADS774 analog-digital conversion in progress, its status output signal STS provides the current state of the converter. When the state signal is high,
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, the device is in the conversion, this time in a high impedance tri-state output buffer state can not be correctly read from the output data. Therefore, in this period,
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, the output signal line changes will be ignored, so as not to affect the converter to work properly. The STS system will then microcontroller INT0.
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