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Today's Topics:
1. r5688 - trunk/gta02-core/docs/ecn (re...@docs.openmoko.org)
2. r5689 - in trunk/gta02-core: . docs/ecn (re...@docs.openmoko.org)
--- Begin Message ---
Author: rehar
Date: 2009-10-13 06:38:53 +0200 (Tue, 13 Oct 2009)
New Revision: 5688
Modified:
trunk/gta02-core/docs/ecn/ecn0010.txt
trunk/gta02-core/docs/ecn/ecn0038.txt
Log:
ECN0010:
- added function of removed components as suggested by Werner
- added missing cap C4114 to the removed components
- added short explaination why R4404 will be removed
ECN0038:
- added change of C4128 to 47pF after brief discussion with Joerg
Modified: trunk/gta02-core/docs/ecn/ecn0010.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0010.txt 2009-10-09 02:47:48 UTC (rev
5687)
+++ trunk/gta02-core/docs/ecn/ecn0010.txt 2009-10-13 04:38:53 UTC (rev
5688)
@@ -6,10 +6,11 @@
gets heavily reconstructed.
Removing the external amplifier (U4101) as well as the amplifier specific
-components R4115, R4114, R4112, R4109, R4108, R4110, R4113, C4117,and C4115.
-Also there is no need for the AMP_SHUTDOWN and HP_IN signals anymore,the
-external speaker and headphone can be fully controlled by the corresponding
-register settings of the codec. (see [1])
+components R4114 (pull-up HP_IN), R4112, R4115 (feedback), R4109 (pull-up
+AMP_SHUT), R4108 (power supply IO_3V3), R4110, R4113 (input), C4117 (bypass),
+C4114 and C4115 (input decoupling). Also there is no need for the AMP_SHUTDOWN
+and HP_IN signals any more,the external speaker and headphone can be fully
+controlled by the corresponding register settings of the codec. (see [1])
The GTA02 earpiece will be connected between OUT3 and LOUT1 of the codec, there
will be no change of the filter and bypass capacitors.
@@ -20,7 +21,11 @@
The external headphone will be connected between ROUT1 and LOUT1.
The common mode choke B4102 will be removed with ECN0032.
+R4404 (MIC_BIAS pull down, NC) does not seem to have any special purpose,
+therefore it can be removed to free more space in the already crowded area of
+the hs jack.
+
[1] http://www.wolfsonmicro.com/uploads/documents/en/WM8753.pdf
Modified: trunk/gta02-core/docs/ecn/ecn0038.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0038.txt 2009-10-09 02:47:48 UTC (rev
5687)
+++ trunk/gta02-core/docs/ecn/ecn0038.txt 2009-10-13 04:38:53 UTC (rev
5688)
@@ -9,10 +9,10 @@
earpiece path) so we can remove at least one unique component from the BOM.
(56 pF would be closer to 39+18 pF, but 47 pF should be good enough.)
-To do:
I do not see any particular reason why C4128 is 10 pF it's there since GTA01.
-This needs to be clarified because this value is rarely used (vibrator) in
-GTA02 schematics and might be worth replacing it.
+This value is rarely used (vibrator) in GTA02 and a 47 pF capacitor will do
+the job just as good. So C4128 will be replaced by 47 pF.
+
Author: Rene Harder <re...@saweb.de>
--- End Message ---
--- Begin Message ---
Author: rehar
Date: 2009-10-13 06:49:10 +0200 (Tue, 13 Oct 2009)
New Revision: 5689
Modified:
trunk/gta02-core/audio.sch
trunk/gta02-core/docs/ecn/ecn0010.txt
Log:
- implemented removal of R4404 from audio sheet according to ECN0010
Modified: trunk/gta02-core/audio.sch
===================================================================
--- trunk/gta02-core/audio.sch 2009-10-13 04:38:53 UTC (rev 5688)
+++ trunk/gta02-core/audio.sch 2009-10-13 04:49:10 UTC (rev 5689)
@@ -1,5 +1,5 @@
-EESchema Schematic File Version 2 date Wed 07 Oct 2009 13:30:01 CDT
-LIBS:power,device,conn,gta02-core,gta02-core-cache
+EESchema Schematic File Version 2 date Mon 12 Oct 2009 11:40:06 PM CDT
+LIBS:power,device,conn,gta02-core
EELAYER 24 0
EELAYER END
$Descr A3 16535 11700
@@ -143,16 +143,7 @@
Connection ~ 9350 3950
Wire Wire Line
9350 3950 9350 3650
-Connection ~ 9400 8150
Wire Wire Line
- 9400 8150 9400 7950
-Wire Wire Line
- 9750 7450 9750 7250
-Wire Wire Line
- 9750 7250 9400 7250
-Wire Wire Line
- 9400 7250 9400 7450
-Wire Wire Line
9600 5200 9400 5200
Wire Wire Line
9400 5200 9400 4150
@@ -1472,25 +1463,6 @@
0 1 1 0
$EndComp
$Comp
-L GND #PWR0213
-U 1 1 4A413C2B
-P 9750 7450
-F 0 "#PWR0213" H 9750 7450 30 0001 C CNN
-F 1 "GND" H 9750 7380 30 0001 C CNN
- 1 9750 7450
- 1 0 0 -1
-$EndComp
-$Comp
-L R_US R4404
-U 1 1 4A413B2E
-P 9400 7700
-F 0 "R4404" V 9350 7500 50 0000 C CNN
-F 1 "NC" V 9450 7570 50 0000 C CNN
-F 2 "0402" H 9350 7850 60 0001 C CNN
- 1 9400 7700
- 0 -1 1 0
-$EndComp
-$Comp
L R_US R4401
U 1 1 4A413AF6
P 8400 8150
Modified: trunk/gta02-core/docs/ecn/ecn0010.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0010.txt 2009-10-13 04:38:53 UTC (rev
5688)
+++ trunk/gta02-core/docs/ecn/ecn0010.txt 2009-10-13 04:49:10 UTC (rev
5689)
@@ -32,3 +32,4 @@
Author: Rene Harder <re...@saweb.de>
Commit: SVN 5118
Review: Werner Almesberger <wer...@openmoko.org>, SVN5675
+Commit: SVN 5689, removed R4404
--- End Message ---
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