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prod/doc/analysis.html: more material on checking the supply voltages
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<H2>Supply voltages</H2>
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The transceiver has three voltage domains:
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<UL>
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<LI>The supply and I/O voltage, which is nominally 3.3 V in
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<B>atben</B> and <B>atusb</B>,
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<LI>the digital (core) supply, which is nominally 1.8 V, and
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<LI>the analog (RF) supply, which is nominally 1.8 V.
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</UL>
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<BR>
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On <B>atusb</B>, there is also the USB voltage domain at nominally 5.0 V.
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<P>
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Voltages should be tested in the following order: USB, then I/O, then
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digital, and finally analog. The table below gives the permissible
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ranges. Any voltages outside of these ranges indicate a problem.
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<P>
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<TABLE>
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<TR><TH>Domain<TH>Nominal<TH>Minimum<TH>Maximum
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<TR><TD>USB<TD>5.0 V<TD>4.5 V<TD>5.25 V
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<TR><TD>I/O<TD>3.3 V<TD>3.0 V<TD>3.6 V
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<TR><TD>Digital<TD>1.8 V<TD>1.7 V<TD>1.9 V
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<TR><TD>Analog<TD>1.8 V<TD>1.7 V<TD>1.9 V
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</TABLE>
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<P>
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<H3>Measurement setup</H3>
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The measurements should be performed either with a digital multimeter.
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To enable all voltage domains, put the transceiver in receive mode:
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<PRE>
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atrf-txrx
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</PRE>
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or
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<PRE>
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atrf-txrx -d net:ben
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</PRE>
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Exit with Ctrl-C.
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<P>
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To produce periodic transmissions in addition to enabling all voltage
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domains, use
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<PRE>
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atrf-txrx -p 3 -E 0
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</PRE>
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or
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<PRE>
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atrf-txrx -d net:ben -p 3 -E 0
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</PRE>
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Again, exit with Ctrl-C. Note that the transmissions may disturb nearby
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equipment operating in the 2.4 GHz band, such as 802.11 networks. This
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can be prevented by shorting the antenna to ground.
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<P>
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In case the board does not accept commands, only the USB and I/O voltage
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can be checked. If they are correct, proceed with checking the clock.
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<!-- ---------------------------------------------------------------------- -->
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<H3>Measurement points on atben</H3>
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<!-- ---------------------------------------------------------------------- -->
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<H3>Measurement points on atusb</H3>
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<!-- ====================================================================== -->
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