r5197 - trunk/gta02-core/docs/ecn

[werner at docs.openmoko.org]

Author: werner
Date: 2009-06-22 19:02:04 +0200 (Mon, 22 Jun 2009)
New Revision: 5197

Added:
   trunk/gta02-core/docs/ecn/ecn0018.txt
   trunk/gta02-core/docs/ecn/ecn0019.txt
   trunk/gta02-core/docs/ecn/ecn0020.txt
   trunk/gta02-core/docs/ecn/ecn0021.txt
   trunk/gta02-core/docs/ecn/ecn0022.txt
   trunk/gta02-core/docs/ecn/ecn0023.txt
Modified:
   trunk/gta02-core/docs/ecn/README
   trunk/gta02-core/docs/ecn/STATUS
Log:
Renamed ambiguous state "Review" to "Discuss".

More new ECNs:

0018  Add beads/filters to audio signals leaving/entering can
0019  Consider applying buzz fix
0020  No common mode choke on stereo signals (B4102)
0021  Use EMI-hardened microphone (MC4301)
0022  Apply bass fix
0023  Fix #1024 (C1009)



Modified: trunk/gta02-core/docs/ecn/README
===================================================================
--- trunk/gta02-core/docs/ecn/README	2009-06-22 14:01:10 UTC (rev 5196)
+++ trunk/gta02-core/docs/ecn/README	2009-06-22 17:02:04 UTC (rev 5197)
@@ -98,9 +98,9 @@
 - Edit: ECN is in the process of being written and not yet suitable for
   detailed review.
 
-- Review: ECN is "finished" and open for review and/or research.
+- Discuss: ECN is "finished" and open for review and/or research.
 
-- Execute: ECN is being implemented.
+- Execute: ECN is being implemented and reviewed.
 
 - Defer: ECN will not be implemented in the current hardware revision
   but may be considered for future revisions.

Modified: trunk/gta02-core/docs/ecn/STATUS
===================================================================
--- trunk/gta02-core/docs/ecn/STATUS	2009-06-22 14:01:10 UTC (rev 5196)
+++ trunk/gta02-core/docs/ecn/STATUS	2009-06-22 17:02:04 UTC (rev 5197)
@@ -2,11 +2,11 @@
 -------	-------	---------------------------------------------------------------
 0001	Edit	Remove Glamo (U1801)
 0002	Edit	Remove NOR (U2501)
-0003	Review	Remove SHUTDOWN net and connect PMU.SHUTDOWN directly to GND
-0004	Review	Remove R1767 and R1768 and connect all PMU.EXTONx to R1766
-0005	Review	Simplify/remove BAT_ID/BATTEMP circuit (R1769)
-0006	Review	Either remove or populate R1701 (PMU.ADAPTSNS pull-down)
-0007	Review	Remove KEEPACT net and connect PMU.KEEPACT directly to IO_3V3
+0003	Discuss	Remove SHUTDOWN net and connect PMU.SHUTDOWN directly to GND
+0004	Discuss	Remove R1767 and R1768 and connect all PMU.EXTONx to R1766
+0005	Discuss	Simplify/remove BAT_ID/BATTEMP circuit (R1769)
+0006	Discuss	Either remove or populate R1701 (PMU.ADAPTSNS pull-down)
+0007	Discuss	Remove KEEPACT net and connect PMU.KEEPACT directly to IO_3V3
 0008	Edit	Remove external GPS antenna connector and circuit (CON7602)
 0009	Edit	Remove LED transistors (Q1501 and Q1502)
 0010	Edit	Remove audio amplifier (U4101)
@@ -17,3 +17,9 @@
 0015	Edit	Remove Calypso serial interface on headset (U4401)
 0016	Edit	Remove upper acceleration sensor (U7801)
 0017	Edit	Move Bluetooth module (U2) to main PCB
+0018	Edit	Add beads/filters to audio signals leaving/entering can
+0019	Edit	Consider applying buzz fix
+0020	Discuss	No common mode choke on stereo signals (B4102)
+0021	Defer	Use EMI-hardened microphone (MC4301)
+0022	Edit	Apply bass fix
+0023	Edit	Fix #1024 (C1009)

Added: trunk/gta02-core/docs/ecn/ecn0018.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0018.txt	                        (rev 0)
+++ trunk/gta02-core/docs/ecn/ecn0018.txt	2009-06-22 17:02:04 UTC (rev 5197)
@@ -0,0 +1,7 @@
+Add beads/filters to audio signals leaving/entering can
+
+
+To do:
+- microphone and headset jack path
+- bead or EMI filter ?
+- location: at can edge

Added: trunk/gta02-core/docs/ecn/ecn0019.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0019.txt	                        (rev 0)
+++ trunk/gta02-core/docs/ecn/ecn0019.txt	2009-06-22 17:02:04 UTC (rev 5197)
@@ -0,0 +1,8 @@
+Consider applying buzz fix
+
+
+To do:
+- Q: do we still need it after adding beads/filters ? (ECN0018)
+- add 100 uF cap
+- change R4303 from 0R to 2k2
+- reference http://wiki.openmoko.org/wiki/Buzz_Fix

Added: trunk/gta02-core/docs/ecn/ecn0020.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0020.txt	                        (rev 0)
+++ trunk/gta02-core/docs/ecn/ecn0020.txt	2009-06-22 17:02:04 UTC (rev 5197)
@@ -0,0 +1,11 @@
+No common mode choke on stereo signals (B4102)
+
+
+A common mode choke on a stereo signal reduces channel separation,
+which is undesirable. If the common-mode choke is still in place
+after all the other audio changes, consider changing it.
+
+Problem pointed out by Joerg Reisenweber <joerg at openmoko.org>
+
+
+Author: Werner Almesberger <werner at openmoko.org>

Added: trunk/gta02-core/docs/ecn/ecn0021.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0021.txt	                        (rev 0)
+++ trunk/gta02-core/docs/ecn/ecn0021.txt	2009-06-22 17:02:04 UTC (rev 5197)
@@ -0,0 +1,12 @@
+Use EMI-hardened microphone (MC4301)
+
+
+For GTA02v8, an EMI-hardened version of the microphone was specified.
+
+The new microphone has a different form factor and needs some of the
+plastic to be cut. We also don't know about component availability.
+While this change is probably too intrusive for gta02-core, it may be
+considered for future versions.
+
+
+Author: Werner Almesberger <werner at openmoko.org>

Added: trunk/gta02-core/docs/ecn/ecn0022.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0022.txt	                        (rev 0)
+++ trunk/gta02-core/docs/ecn/ecn0022.txt	2009-06-22 17:02:04 UTC (rev 5197)
@@ -0,0 +1,6 @@
+Apply bass fix
+
+
+To do:
+- more details - what is actually involved ?
+- is this part of the switch to a "capless" design ?

Added: trunk/gta02-core/docs/ecn/ecn0023.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0023.txt	                        (rev 0)
+++ trunk/gta02-core/docs/ecn/ecn0023.txt	2009-06-22 17:02:04 UTC (rev 5197)
@@ -0,0 +1,7 @@
+Fix #1024 (C1009)
+
+
+To do:
+- change C1009 from Y5V to X5R
+- increase C1009 from 10 uF to 22 uF
+- improve routing