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ubb-patgen/hw/: a simple resistor on CMD is sufficient - no need for a cap

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Cheaper and easier to control.
This commit is contained in:
Werner Almesberger 2013-01-14 03:05:06 -03:00
parent 52ce1947c5
commit 47140384ee
2 changed files with 31 additions and 36 deletions
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2
ubb-patgen/hw/ubb-patgen.pro
View File

@ -13,6 +13,6 @@ RptLab=1
LabSize=60
[eeschema/libraries]
LibName1=pwr
LibName2=c
LibName2=r
LibName3=8_10-card
LibName4=conn

65
ubb-patgen/hw/ubb-patgen.sch
View File

@ -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