Subject:
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Re: no long range IR from laptop says Lego
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Wed, 12 Feb 2003 18:34:07 GMT
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Viewed:
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2912 times
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Kindly offline I am informed: yes indeed, some laptop designs have been seen
to support less than half of the specified 500mA max load for USB bus power.
I wonder how many mA the USB IR tower does need.
Pat LaVarre
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Message has 1 Reply:
 | | Re: no long range IR from laptop says Lego
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| (...) Its USB descriptors say there are two configurations with 100mA (I think these are for low and medium power), and two that require 500mA (high power mode). The LEGO USB Tower Interface Reference doesn't go into more details. Jürgen (22 years ago, 12-Feb-03, to lugnet.robotics.rcx)
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Message is in Reply To:
| | no long range IR from laptop says Lego
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| Does the Lego USB IR tower, when set to long range, sometimes draw more than the 500mA allowed? Or do laptops generally not reliably supply 500mA? Or are we facing some deeper analog issue here, like not ramping up to 500mA from less mA fast enough (...) (22 years ago, 12-Feb-03, to lugnet.robotics.rcx)
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