From 47140384eea2d7783848ae564b2928c2cd8d5da9 Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@almesberger.net>
Date: Mon, 14 Jan 2013 03:05:06 -0300
Subject: [PATCH] ubb-patgen/hw/: a simple resistor on CMD is sufficient - no
 need for a cap

Cheaper and easier to control.
---
 ubb-patgen/hw/ubb-patgen.pro |  2 +-
 ubb-patgen/hw/ubb-patgen.sch | 65 +++++++++++++++++-------------------
 2 files changed, 31 insertions(+), 36 deletions(-)

diff --git a/ubb-patgen/hw/ubb-patgen.pro b/ubb-patgen/hw/ubb-patgen.pro
index b9e96e4..890865e 100644
--- a/ubb-patgen/hw/ubb-patgen.pro
+++ b/ubb-patgen/hw/ubb-patgen.pro
@@ -13,6 +13,6 @@ RptLab=1
 LabSize=60
 [eeschema/libraries]
 LibName1=pwr
-LibName2=c
+LibName2=r
 LibName3=8_10-card
 LibName4=conn
diff --git a/ubb-patgen/hw/ubb-patgen.sch b/ubb-patgen/hw/ubb-patgen.sch
index c8ef97c..034b794 100644
--- a/ubb-patgen/hw/ubb-patgen.sch
+++ b/ubb-patgen/hw/ubb-patgen.sch
@@ -1,16 +1,15 @@
-EESchema Schematic File Version 2  date Mon Jan  7 10:11:27 2013
+EESchema Schematic File Version 2  date Mon Jan 14 03:04:34 2013
 LIBS:pwr
-LIBS:c
+LIBS:r
 LIBS:8_10-card
 LIBS:conn
-LIBS:ubb-patgen-cache
 EELAYER 25  0
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
 Sheet 1 1
 Title ""
-Date "7 jan 2013"
+Date "14 jan 2013"
 Rev ""
 Comp ""
 Comment1 ""
@@ -39,10 +38,10 @@ $EndComp
 $Comp
 L GND #PWR01
 U 1 1 50EABCDB
-P 7700 4100
-F 0 "#PWR01" H 7700 4100 30  0001 C CNN
-F 1 "GND" H 7700 4030 30  0001 C CNN
-	1    7700 4100
+P 7700 4700
+F 0 "#PWR01" H 7700 4700 30  0001 C CNN
+F 1 "GND" H 7700 4630 30  0001 C CNN
+	1    7700 4700
 	1    0    0    -1  
 $EndComp
 Text Label 4000 3100 0    60   ~ 0
@@ -54,15 +53,6 @@ CH0
 Text Label 4000 3400 0    60   ~ 0
 CH1
 $Comp
-L C C1
-U 1 1 50EABD55
-P 7000 4200
-F 0 "C1" V 7100 4300 60  0000 L CNN
-F 1 "1n" V 7100 4000 60  0000 L CNN
-	1    7000 4200
-	0    -1   -1   0   
-$EndComp
-$Comp
 L CONN_1 P3
 U 1 1 50EABD9A
 P 3650 3700
@@ -93,12 +83,25 @@ Text Label 4000 3700 0    60   ~ 0
 TRIGGER/CLK
 Text Label 4000 3900 0    60   ~ 0
 GND
-Text Notes 3700 5200 0    60   ~ 0
-C1: pull CMD low for start bit of fake R1 response.
-Text Notes 3900 5350 0    60   ~ 0
-1 nF raises from 0 V through 10 kOhm pull-up at approx. 0.3 V/us.
-Text Notes 3900 5500 0    60   ~ 0
-1 nF falls from 3.3 V to 0.8 V through Ron of approx. 90 Ohm within 130 ns.
+NoConn ~ 7900 3400
+$Comp
+L R R1
+U 1 1 50F39FCD
+P 7300 4250
+F 0 "R1" H 7430 4300 60  0000 C CNN
+F 1 "100" H 7450 4200 60  0000 C CNN
+	1    7300 4250
+	1    0    0    -1  
+$EndComp
+$Comp
+L GND #PWR?
+U 1 1 50F39FDA
+P 7300 4700
+F 0 "#PWR?" H 7300 4700 30  0001 C CNN
+F 1 "GND" H 7300 4630 30  0001 C CNN
+	1    7300 4700
+	1    0    0    -1  
+$EndComp
 Wire Wire Line
 	7900 3100 3800 3100
 Wire Wire Line
@@ -116,13 +119,9 @@ Wire Wire Line
 Wire Wire Line
 	6100 3400 3800 3400
 Wire Wire Line
-	7700 4100 7700 3600
+	7700 4700 7700 3600
 Wire Wire Line
 	7700 3600 7900 3600
-Wire Wire Line
-	6600 3300 6600 4200
-Wire Wire Line
-	6600 3300 7900 3300
 Wire Wire Line
 	7900 3500 5600 3500
 Wire Wire Line
@@ -134,13 +133,9 @@ Wire Wire Line
 Wire Wire Line
 	6000 3900 6000 4100
 Wire Wire Line
-	7400 3400 7900 3400
+	7300 4000 7300 3300
 Wire Wire Line
-	7400 3400 7400 4200
+	7300 3300 7900 3300
 Wire Wire Line
-	7400 4200 7200 4200
-Wire Wire Line
-	6600 4200 6800 4200
-Text Notes 3900 5650 0    60   ~ 0
-(A configuration with C1 connected to GND would be largely equivalent.)
+	7300 4500 7300 4700
 $EndSCHEMATC