r5894 - trunk/gta02-core/bom/research

[werner at docs.openmoko.org]

Author: werner
Date: 2010-04-04 07:44:33 +0200 (Sun, 04 Apr 2010)
New Revision: 5894

Modified:
   trunk/gta02-core/bom/research/STATUS
   trunk/gta02-core/bom/research/u7604
Log:
Researched the Ricoh R3113D241A-TR-F



Modified: trunk/gta02-core/bom/research/STATUS
===================================================================
--- trunk/gta02-core/bom/research/STATUS	2010-04-04 05:20:23 UTC (rev 5893)
+++ trunk/gta02-core/bom/research/STATUS	2010-04-04 05:44:33 UTC (rev 5894)
@@ -9,7 +9,6 @@
 JAR02-062101		jk4401		manuf. may be dead, inc. subst. likely
 PCF50633HN/04/N3,5	u1701		large minimum order
 PPR06-023104
-R3113D241A-TR-F		u7604		not researched yet
 RT9013-12PB
 RT9711BPB		u4905		not researched yet
 SC32442B54		u1501		not found yet, brokers list it
@@ -20,16 +19,17 @@
 WITH INCOMPATIBILE SUBSTITUTE:
 
 Part			File		Status			Incompatibility
-								Foot  Circuit
-								| Mech| Functn
-								| | Pins|
+					(of original part;	Foot  Circuit
+					 of substitute only	| Mech| Functn
+					 if indicated)		| | Pins|
 ----------------------	--------------	----------------------  +-+-+-+-+------
-AAT1275IRN-5.0-T1	u4904		not found yet		X - X X 1
+AAT1275IRN-5.0-T1	u4904		not found yet		X - X X 1)
 BF2520-B2R4CAB/LF	u8002		not found yet		X - - - -
 BTP-03JA4G		con1701		no distributor		X ? ? - -
 FA2012-KR40PAA		u6007		not found yet		X - - - -
 HT-210UD/NB		led1501		long lead time		X - X ? colors
 IT3205BE		x7601		not found, sub. expens	X - - - -
+R3113D241A-TR-F		u7604		not found yet		X - X - -
 SN74AUP1G00DCKR		u4902		borderline availab.	X - - - -
 WTE06016		ant8001		not found		X X ? - -
 

Modified: trunk/gta02-core/bom/research/u7604
===================================================================
--- trunk/gta02-core/bom/research/u7604	2010-04-04 05:20:23 UTC (rev 5893)
+++ trunk/gta02-core/bom/research/u7604	2010-04-04 05:44:33 UTC (rev 5894)
@@ -3,3 +3,19 @@
 research needed.
 
 R3113D241A-TR-F     LNR-IC V-DETECTOR R3113D241A-TR-F 2.4V SON1408-3 3PIN
+
+Before starting the search for a replacement, why do we actually need a
+reset generator ?
+
+- the ATR635 data sheet shows in Figure 3-2 that the chip should work
+  even without connecting NRESET at all.
+
+- even if we need an external reset for some reason, couldn't we just
+  use a GPIO (from the 1.8 V domain, GPAx), perhaps with some EMI filter
+  to prevent inter-can pollution ?
+
+The Panasonic MN13821SGP might be a suitable replacement.
+
+		Package		Threshold	Min Vdd
+R3113D241A	SON-1408-3	2.4 V		0.45 V ?
+MN13821SGP	MINI-3DC, 3x3mm	2.4 V		1.5 V