r5911 - trunk/gta02-core/docs/ecn
werner at docs.openmoko.org
werner at docs.openmoko.org
Wed Apr 7 21:24:05 CEST 2010
Date: 2010-04-07 21:24:04 +0200 (Wed, 07 Apr 2010)
New Revision: 5911
Added ECN0045 discussing the fate of components with zero stock at FIC.
--- trunk/gta02-core/docs/ecn/STATUS 2010-04-07 18:04:06 UTC (rev 5910)
+++ trunk/gta02-core/docs/ecn/STATUS 2010-04-07 19:24:04 UTC (rev 5911)
@@ -44,6 +44,8 @@
0042 Discuss Changing internal microphone to symmetrical configuration
0043 Discuss Assorted audio cleanup
0044 Discuss Current rating of backlight LED inductor (L1704)
+0045 Edit Zero stock component replacements
+0046 Edit reserved for more component replacements
--- trunk/gta02-core/docs/ecn/ecn0045.txt (rev 0)
+++ trunk/gta02-core/docs/ecn/ecn0045.txt 2010-04-07 19:24:04 UTC (rev 5911)
@@ -0,0 +1,84 @@
+Zero stock component replacements
+The following components are no longer available in FIC's inventory
+and need to be sourced or replaced no matter how we proceed:
+- ANT8101, CON8001: Murata MM8430-2610RB3, antenna connector GSM, WLAN
+- CON1701: Octek BTP-03JA4G, battery connector
+- CON4702, CON6001: Hirose FH23-39S-0.3SHW(05), FPC connector for LCM and debug
+- CON7501: Proconn SMSN16-J0-2214, SIM/uSD combi holder
+- CON7601: Hirose U.FL-R-SMT-1(10), GPS antenna connector
+- JK4401: Nuconn JAR02-062101, 2.5 mm audio jack
+- SPK4102: PPR06-023104, dual pogo pin
+- U1701: NXP PCF50633HN/04/N3,5, PMU
+- U2201: Samsung K4M51323PC-DG75, mobile SDRAM
+- U3001: Wolfson WM8753LGEFL, audio codec
+- U4902: TI SN74AUP1G00DCKR, NAND gate
+- U4904: Analogic Tech AAT1275IRN-5.0-T1, boost converter for USB host
+- U7601: Atmel ATR0635-7KQY, GPS receiver
+- U7802: STM LIS302DL, acceleration sensor
+- resistors (all 0402):
+ - 1% 12.5 kOhm, 39 kOhm
+ - 5%: 220 Ohm
+ - 0402 NP0: 8.2 pF, 15 pF, 22 pF, 100 pF, 220 pF
+ - 0402 X5R/X7R: 820 pF, 1 uF 6.3 V
+ - 0603 X5R/X7R: 2.2 uF 10 V, 4.7 uF 6.3 V
+ - 0805 Y5V: 10 uF 0805
+For all the resistors and capacitors, suitable replacements have been
+found. The connectors by Murata and Hirose are available at Digi-Key,
+and so is the acceleration sensor.
+U3001, U4902, and U7802 can be purchased from major distributors as
+U2201  (13.0 x 11.0 x 1.0 mm) can be replaced with the
+pin-compatible Micron MT48H16M32LFCM-75:B  (13.0 x 10.0 x 1.0 mm).
+The PMU (U1701) and the GPS receiver (U7601) have proven difficult to
+source so far. For details, see bom/research/u1701 and
+The remaining items are apparently not carried by any major
+distributors and need to be substituted with reasonably similar parts:
+- It may be possible to obtain samples for the boost converter U4904,
+ or to buy directly from the manufacturer. There are also several
+ similar parts, but all differ in the external circuit elements. See
+ bom/research/u4904 for details.
+- There is a battery connector similar to CON1701, although lower and
+ with shorter contacts. It may be possible to find a more similar part
+ by searching some more. See bom/research/con1701 for details.
+- We have an excellent replacement for the SIM/uSD card holder CON7501.
+ Its only drawbacks are a slightly different footprint and a different
+ pin assignment. See bom/research/con7501 for details.
+- The search for a replacement for audio jack JK4401 has been
+ remarkably unsuccessful so far. All functionally equivalent
+ replacements are considerably larger. Even if we'd consider going to
+ a 3.5 mm stereo jack, without microphone, there may be no part short
+ enough to not conflict with the battery connector. See
+ bom/research/jk4401 for details.
+- The dual pogo pin SPK4102 depends on the contacts of the speaker.
+ This still needs looking at.
+- U3001, U4902, U7802, Murata, Hirose: use original parts
+- U2201, CON7501, resistors, capacitors: replace as indicated above
+- U1701, U7601: keep on searching
+- CON1701, JK4401: it would be great if someone could find parts more
+ similar to the respective original. If not, we'll have to see if we
+ can find a combination that works reasonably well.
+- SPK4102: to be defined
+Author: Werner Almesberger <werner at openmoko.org>
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