FreeCalypso > hg > fc-small-hw

changeset 37:b2d6d8f756ea

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duart28/design-spec: re-measured partial power-down current
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 23 Jul 2020 18:14:16 +0000
parents 40e2106a0500
children ba83a7cd6451
files duart28/design-spec
diffstat 1 files changed, 2 insertions(+), 2 deletions(-) [+]
line wrap: on
line diff
--- a/duart28/design-spec	Thu Jul 23 06:59:32 2020 +0000
+++ b/duart28/design-spec	Thu Jul 23 18:14:16 2020 +0000
@@ -172,8 +172,8 @@
 device is up and running (VRPC Active state), but there is no USB host
 connected, current can flow from Calypso outputs into a powered-down FT2232D
 (or other front-end chips) in the USB DUART adapter.  With our current raw
-FT2232D-to-Calypso arrangement we have about 5 mA of current flowing per pin
-under the described condition, which is a little too much.
+FT2232D-to-Calypso arrangement we have about 5.8 mA of current flowing per pin
+under the described condition, which is way too much.
 
 If we replace the generic FT2232D breakout with our own custom adapter board
 design, we can solve the second partial power-down problem (the case of Calypso