“Microduino-BM”的版本间的差异
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− | + | Eagle PCB '''[[File:Microduino-BM.zip]]'' | |
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2014年10月31日 (五) 10:29的版本
Language | English |
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文件:Microduino-BM-rect.jpg Microduino-BM
Microduino-BM is a discharging module which combines a single-cell Li-ion battery charge management, power detection and LED indication. The output voltage is 5V, and LDO is 3.3V output, providing the outstanding battery management for the Microduino-Core module.
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目录Features
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SpecificationsInterface
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Charging
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Discharging
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Low-voltage Battery Protection
Low voltage indicator goes on under 3.60V and when the voltage keeps decreasing to 2.40V, the lithium battery protection circuit works. The indicator will go out when the battery is powered to 3.71V.
Short-circuit ProtectionWhen the output current reaches 1.2A, the lithium battery protection circuit starts and cuts off power supply. The circuit will be activated and get back to work only when you plug in MicroUSB to charge. Efficiency of BM and Its Load Driven Capacity100ma 5.05v output: 文件:Micrmodule-BM-100.jpg 100ma/5.05V | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
300ma 5.05v output: 文件:Micrmodule-BM-300.jpg 300ma/5.05V | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
500ma 5.05v output: 文件:Micrmodule-BM-500.jpg 500ma/5.05V | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
700ma 5.05v output: 文件:Micrmodule-BM-700.jpg 700ma/5.05V | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
1A 5.05v output: 文件:Micrmodule-BM-1A.jpg 1A/5.05V | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
We can see from data above that BM’s 5v output shows excellent transfer efficiency no matter under low or high power output. The load driven capacity of that can reach 1A. The 3.3v transferring efficiency depends on the 1117 chip, which should be around 60% and the load driven capacity can reach up to 600ma. Temperature Rise of System OperationTemperature rise under 5v output and 30 ℃ indoor: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Temperature rise under 3.3v output and 26 ℃ indoor: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
DocumentsEagle PCB '文件:Microduino-BM.zip
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Development
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ApplicationsWhen viewing the board with the battery connector and switches closest to you, with the component side up, the battery connector positive (+) pin is on the left and the ground (-) pin is on the right. The pushbutton switch is on the left and the mode switch (IN = Charge, lever to the left; OUT = Discharge, lever to the right) is on the right. After connecting the battery you must momentarily push the pushbutton switch to start the converter. You can stop the converter/turn off the power by unplugging the battery or by pressing and holding the pushbutton for a few seconds. To use the battery to generate +5 VDC and +3.3 VDC, set the mode switch (to the right of the battery connector when viewed as described above) to OUT (switch lever away from the battery connector). The IN position is used for charging the battery from an external 5VDC, >=600 mA source. The charging current is 500 mA, so I recommend a battery with at least 500 mAH of capacity to avoid charging at a rate >1C. A rough English translation of the charging process is as follows:
The LED indications seem to be as follows, based on how Google Translate translates the Chinese datasheet for the HOTCHIP HT4901 at http://www.hotchip.com.cn/DownFiles/20131126090806453.pdf Discharge Mode
Charge Mode
Be prepared to terminate the charging process immediately when all four LEDs are on and steady. Overcharging lithium-type batteries may result in a nasty fire. I don't know how good the HT4901 is at detecting that the charging process is complete and shutting off the charging current to the battery. Hope I correctly translated this information.
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Pictures文件:Micrmodule-BM-t.jpg Micrmodule BM Front 文件:Micrmodule-BM-b.jpg Micrmodule BM Back | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
FQA
HistoryNovember 14, 2013 new release, major improvements:
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