r5888 - in trunk/gta02-core: . docs/ecn

[werner at docs.openmoko.org]

Author: werner
Date: 2010-04-03 13:38:11 +0200 (Sat, 03 Apr 2010)
New Revision: 5888

Modified:
   trunk/gta02-core/docs/ecn/ecn0044.txt
   trunk/gta02-core/pmu.sch
Log:
- pmu.sch: changed footprint of L1704 to 1210, to allow eithr part discussed in
  ECN0044 to be placed
- docs/ecn/ecn0044.txt: clarified that power savings obtained by using a larger
  inductor are only small



Modified: trunk/gta02-core/docs/ecn/ecn0044.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0044.txt	2010-04-03 11:21:29 UTC (rev 5887)
+++ trunk/gta02-core/docs/ecn/ecn0044.txt	2010-04-03 11:38:11 UTC (rev 5888)
@@ -16,8 +16,9 @@
 
 It thus seems that 500 mA are sufficient for normal operation.
 
-Another consideration is the power lost due to the inductor's resistance.
-Inductors with a high current rating also tend to have a low resistance.
+Another (small) consideration is the power lost due to the inductor's
+resistance. Inductors with a high current rating also tend to have a low
+resistance.
 
 If a 800 mA and 0805 part is too difficult to source, we therefore have
 two choices:
@@ -35,3 +36,5 @@
 
 Author: Werner Almesberger <werner at openmoko.org>
 Commit: SVN 5879, tentatively lowered current rating to 600 mA
+Commit: SVN 5888, tentatively changed footprint to 1210, to allow for either
+  choice

Modified: trunk/gta02-core/pmu.sch
===================================================================
--- trunk/gta02-core/pmu.sch	2010-04-03 11:21:29 UTC (rev 5887)
+++ trunk/gta02-core/pmu.sch	2010-04-03 11:38:11 UTC (rev 5888)
@@ -1,4 +1,4 @@
-EESchema Schematic File Version 2  date Thu Apr  1 18:26:00 2010
+EESchema Schematic File Version 2  date Sat Apr  3 08:34:40 2010
 LIBS:power,device,conn,gta02-core,gta02-core-cache
 EELAYER 24  0
 EELAYER END
@@ -2097,7 +2097,7 @@
 P 11200 6550
 F 0 "L1704" V 11150 6400 50  0000 C CNN
 F 1 "2u2" V 11150 6650 50  0000 C CNN
-F 2 "0805" H 11200 6550 60  0001 C CNN
+F 2 "1210" H 11200 6550 60  0001 C CNN
 F 4 "600mA" V 11150 6900 50  0000 C CNN "I"
 	1    11200 6550
 	0    1    1    0