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Today's Topics:
1. r5691 - trunk/gta02-core/docs/ecn ([email protected])
2. r5692 - trunk/gta02-core/docs/ecn ([email protected])
--- Begin Message ---
Author: werner
Date: 2009-10-14 15:31:18 +0200 (Wed, 14 Oct 2009)
New Revision: 5691
Modified:
trunk/gta02-core/docs/ecn/STATUS
trunk/gta02-core/docs/ecn/ecn0038.txt
Log:
- moved ECN0019 (Buzz fix) to "Done"
- reviewed ECN0038 (speaker EMI filter) and moved it to "Execute"
Modified: trunk/gta02-core/docs/ecn/STATUS
===================================================================
--- trunk/gta02-core/docs/ecn/STATUS 2009-10-14 06:54:50 UTC (rev 5690)
+++ trunk/gta02-core/docs/ecn/STATUS 2009-10-14 13:31:18 UTC (rev 5691)
@@ -18,7 +18,7 @@
0016 Done Remove upper acceleration sensor (U7801)
0017 Done Move Bluetooth module (U2) to main PCB
0018 Cancel Add beads/filters to audio signals leaving/entering can
-0019 Discuss Consider applying buzz fix
+0019 Done Consider applying buzz fix
0020 Cancel No common mode choke on stereo signals (B4102)
0021 Defer Use EMI-hardened microphone (MC4301)
0022 Done Apply bass fix
@@ -37,7 +37,7 @@
0035 Done Kill WLAN unused RF components
0036 Done Removal of decoupling capacitor C3020
0037 Done Route ROUT1/LOUT1 back to LINE1/LINE2 input
-0038 Discuss Loudspeaker EMI filter
+0038 Execute Loudspeaker EMI filter
0039 Discuss Insert 0R resistors into SPI signals
0040 Discuss Remove backup battery (BAT1701)
0041 Discuss Test points and 0R resistors for camera interface
@@ -50,7 +50,6 @@
0002 MEMORY, CPU
0008 GPS
0011 USB
-0019 AUDIO
0024 GPS
0026 SD-SIM
0027 General
Modified: trunk/gta02-core/docs/ecn/ecn0038.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0038.txt 2009-10-14 06:54:50 UTC (rev
5690)
+++ trunk/gta02-core/docs/ecn/ecn0038.txt 2009-10-14 13:31:18 UTC (rev
5691)
@@ -14,5 +14,5 @@
the job just as good. So C4128 will be replaced by 47 pF.
-
Author: Rene Harder <[email protected]>
+Review: Werner Almesberger <[email protected]>, SVN 5690
--- End Message ---
--- Begin Message ---
Author: werner
Date: 2009-10-14 15:59:55 +0200 (Wed, 14 Oct 2009)
New Revision: 5692
Modified:
trunk/gta02-core/docs/ecn/STATUS
trunk/gta02-core/docs/ecn/ecn0010.txt
Log:
- reopened ECN0010 (as "Discuss") and added summary of power supply discussion
Modified: trunk/gta02-core/docs/ecn/STATUS
===================================================================
--- trunk/gta02-core/docs/ecn/STATUS 2009-10-14 13:31:18 UTC (rev 5691)
+++ trunk/gta02-core/docs/ecn/STATUS 2009-10-14 13:59:55 UTC (rev 5692)
@@ -9,7 +9,7 @@
0007 Done Remove KEEPACT net and connect PMU.KEEPACT directly to IO_3V3
0008 Execute Remove external GPS antenna connector and circuit (CON7602)
0009 Done Remove LED transistors (Q1501 and Q1502)
-0010 Done Remove audio amplifier (U4101)
+0010 Discuss Remove audio amplifier (U4101)
0011 Execute Reduce number of varistors on USB_VBUS (C4902, C4909)
0012 Defer Add fuse to USB_VBUS
0013 Defer Increase rated current of B4902
@@ -49,6 +49,7 @@
0001 GLAMO, CPU, LCM
0002 MEMORY, CPU
0008 GPS
+0010 AUDIO
0011 USB
0024 GPS
0026 SD-SIM
Modified: trunk/gta02-core/docs/ecn/ecn0010.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0010.txt 2009-10-14 13:31:18 UTC (rev
5691)
+++ trunk/gta02-core/docs/ecn/ecn0010.txt 2009-10-14 13:59:55 UTC (rev
5692)
@@ -25,11 +25,28 @@
therefore it can be removed to free more space in the already crowded area of
the hs jack.
+Since HPVDD and SPKRVDD may draw about 150 mA in normal operation,
+CODEC_3V3 needs to be supplied from a more powerful source than LDO2
+(limited to 50 mA). We can use LDO4 (capable of supplying 150 mA) if
+we move BT_3V2 to LDO2. The Bluetooth modules draws only up to 35 mA,
+so the 50 mA of LDO2 are sufficient.
+Testing [2] showed that shorting LDO4 will cause it to limit the current
+to about 500 mA, which is still low enough to prevent immediate problems
+for the rest of the system.
+
+Open issue: do we continue feeding LDOs 3 and 4 from Vsys or do we move
+them to IO_3V3 for better efficiency ? (In the latter case, AVDD etc al.
+would have to operate at 3.05 V or less, due to the 250 mV voltage drop
+of the LDO.) [3]
+
[1] http://www.wolfsonmicro.com/uploads/documents/en/WM8753.pdf
+[2] http://lists.openmoko.org/pipermail/gta02-core/2009-October/000744.html
+[3] http://lists.openmoko.org/pipermail/gta02-core/2009-October/000746.html
Author: Rene Harder <[email protected]>
Commit: SVN 5118
Review: Werner Almesberger <[email protected]>, SVN5675
Commit: SVN 5689, removed R4404
+Commit: SVN 5692, reopened and added power supply
--- End Message ---
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