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atusb/usb.sch: specified capacitance of TVSs (33 pF) and explained why

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This commit is contained in:
Werner Almesberger 2011-01-03 16:32:52 -03:00
parent 882558b953
commit 08eec5b3a9
1 changed files with 6 additions and 1 deletions
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7
atusb/usb.sch
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@ -1,4 +1,4 @@
EESchema Schematic File Version 2 date Mon Jan 3 15:54:00 2011 EESchema Schematic File Version 2 date Mon Jan 3 16:32:06 2011
LIBS:power LIBS:power
LIBS:device LIBS:device
LIBS:conn LIBS:conn
@ -22,6 +22,8 @@ Comment2 ""
Comment3 "" Comment3 ""
Comment4 "" Comment4 ""
$EndDescr $EndDescr
Text Notes 2600 5000 0 60 ~ 0
USB 2.0 limits the capacitative load\non full-speed drivers to 50 pF.
Wire Notes Line Wire Notes Line
6950 900 6900 900 6950 900 6900 900
Wire Notes Line Wire Notes Line
@ -316,6 +318,7 @@ P 3700 4300
F 0 "VR3" V 3780 4300 50 0000 C CNN F 0 "VR3" V 3780 4300 50 0000 C CNN
F 1 "5V6" V 3700 4300 50 0000 C CNN F 1 "5V6" V 3700 4300 50 0000 C CNN
F 2 "0402" H 3700 4300 60 0001 C CNN F 2 "0402" H 3700 4300 60 0001 C CNN
F 4 "33pF" V 3600 4400 50 0000 C CNN "Field4"
1 3700 4300 1 3700 4300
-1 0 0 -1 -1 0 0 -1
$EndComp $EndComp
@ -326,6 +329,7 @@ P 3400 4300
F 0 "VR2" V 3480 4300 50 0000 C CNN F 0 "VR2" V 3480 4300 50 0000 C CNN
F 1 "5V6" V 3400 4300 50 0000 C CNN F 1 "5V6" V 3400 4300 50 0000 C CNN
F 2 "0402" H 3400 4300 60 0001 C CNN F 2 "0402" H 3400 4300 60 0001 C CNN
F 4 "33pF" V 3300 4400 50 0000 C CNN "Field4"
1 3400 4300 1 3400 4300
-1 0 0 -1 -1 0 0 -1
$EndComp $EndComp
@ -336,6 +340,7 @@ P 3100 4300
F 0 "VR1" V 3180 4300 50 0000 C CNN F 0 "VR1" V 3180 4300 50 0000 C CNN
F 1 "5V6" V 3100 4300 50 0000 C CNN F 1 "5V6" V 3100 4300 50 0000 C CNN
F 2 "0402" H 3100 4300 60 0001 C CNN F 2 "0402" H 3100 4300 60 0001 C CNN
F 4 "33pF" V 3000 4400 50 0000 C CNN "Field4"
1 3100 4300 1 3100 4300
-1 0 0 -1 -1 0 0 -1
$EndComp $EndComp