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sch: mark VCCPLL regulator as DNP, use filter circuit

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The VCCPLL line is extraordinarily sensitive to voltage rise times, and
appears to cause the FPGA to go into latchup very very easily.

As a result, the VCCPLL regulator burns all 250 mA of its budget
constantly, as the FPGA shunts VCCPLL to GND.  This would be ideal
during an ESD event, but not ideal during normal operations.

Indicate the VCCPLL Regulator approach is DNP, and that the VCCPLL
Filter Network is preferred.  Mostly because the regulator doesn't work
at all.

Signed-off-by: Sean Cross <sean@xobs.io>
This commit is contained in:
Sean Cross 2018-11-23 15:56:35 +08:00
parent fbd26383f8
commit 9e6faf4456
2 changed files with 24 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
hardware/pcb/tomu-fpga-cache.lib
View File

@ -28,7 +28,6 @@ F2 "" 0 0 50 V I C CNN
F3 "" 0 0 50 V I C CNN
$FPLIST
TO-???*
*SingleDiode
*_Diode_*
*SingleDiode*
D_*
@ -44,13 +43,15 @@ ENDDEF
#
# Device:LED
#
DEF Device:LED D 0 40 Y N 1 F N
DEF Device:LED D 0 40 N N 1 F N
F0 "D" 0 100 50 H V C CNN
F1 "Device:LED" 0 -100 50 H V C CNN
F2 "" 0 0 50 H I C CNN
F3 "" 0 0 50 H I C CNN
$FPLIST
LED*
LED_SMD:*
LED_THT:*
$ENDFPLIST
DRAW
P 2 0 1 8 -50 -50 -50 50 N

39
hardware/pcb/tomu-fpga.sch
View File

@ -632,12 +632,12 @@ L Device:C_Small C23
U 1 1 5BE5ACB9
P 9700 4850
F 0 "C23" V 9650 4900 50 0000 L CNN
F 1 "0805, 100nF, 10V, X5R, 20% (DNP)" V 9650 3450 50 0000 L CNN
F 1 "0805, 100nF, 10V, X5R, 20%" V 9650 3700 50 0000 L CNN
F 2 "tomu-fpga:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 9700 4850 50 0001 C CNN
F 3 "" H 9700 4850 50 0001 C CNN
F 4 "DNP" H 350 100 50 0001 C CNN "MPN"
F 5 "DNP" H 350 100 50 0001 C CNN "MYPN"
F 6 "DNP" H 350 100 50 0001 C CNN "Manufacturer"
F 4 "ANY" H 350 100 50 0001 C CNN "MPN"
F 5 "ANY" H 350 100 50 0001 C CNN "MYPN"
F 6 "ANY" H 350 100 50 0001 C CNN "Manufacturer"
1 9700 4850
0 -1 -1 0
$EndComp
@ -646,12 +646,12 @@ L Device:C_Small C22
U 1 1 5BE5AF99
P 9700 4650
F 0 "C22" V 9650 4450 50 0000 L CNN
F 1 "0805, 10uF, 10V, X5R, 20% (DNP)" V 9650 4700 50 0000 L CNN
F 1 "0805, 10uF, 10V, X5R, 20%" V 9650 4700 50 0000 L CNN
F 2 "tomu-fpga:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 9700 4650 50 0001 C CNN
F 3 "" H 9700 4650 50 0001 C CNN
F 4 "DNP" H 350 100 50 0001 C CNN "MPN"
F 5 "DNP" H 350 100 50 0001 C CNN "MYPN"
F 6 "DNP" H 350 100 50 0001 C CNN "Manufacturer"
F 4 "ANY" H 350 100 50 0001 C CNN "MPN"
F 5 "ANY" H 350 100 50 0001 C CNN "MYPN"
F 6 "ANY" H 350 100 50 0001 C CNN "Manufacturer"
1 9700 4650
0 1 1 0
$EndComp
@ -663,13 +663,13 @@ $Comp
L Device:R_Small R10
U 1 1 5BF5243E
P 9150 4500
F 0 "R10" H 9050 4400 50 0000 C CNN
F 1 "0805, 100ohm, 1/16W, 1% (DNP)" H 8450 4500 50 0000 C CNN
F 0 "R10" V 9150 4500 50 0000 C CNN
F 1 "0805, 100ohm, 1/16W, 1%" H 8550 4500 50 0000 C CNN
F 2 "tomu-fpga:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 9150 4500 50 0001 C CNN
F 3 "" H 9150 4500 50 0001 C CNN
F 4 "DNP" H 350 100 50 0001 C CNN "MPN"
F 5 "DNP" H 350 100 50 0001 C CNN "MYPN"
F 6 "DNP" H 350 100 50 0001 C CNN "Manufacturer"
F 4 "ANY" H 350 100 50 0001 C CNN "MPN"
F 5 "ANY" H 350 100 50 0001 C CNN "MYPN"
F 6 "ANY" H 350 100 50 0001 C CNN "Manufacturer"
1 9150 4500
-1 0 0 1
$EndComp
@ -1305,7 +1305,7 @@ L tomu-fpga:LDO-SOT23 U8
U 1 1 5BDB73B2
P 8150 4750
F 0 "U8" H 8400 4950 50 0000 C CNN
F 1 "LDO-SOT23-1.2V" H 8050 4700 50 0000 C CNN
F 1 "LDO-SOT23-1.2V (DNP)" H 8250 4700 50 0000 C CNN
F 2 "tomu-fpga:SOT-23-5_HandSoldering" H 8200 4750 50 0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lp5907.pdf" H 8200 4750 50 0001 C CNN
F 4 "LP5907MFX-1.2/NOPB" H 8150 4750 50 0001 C CNN "MPN"
@ -1314,6 +1314,7 @@ F 6 "MIC5504-1.2YMT" H 8150 4750 50 0001 C CNN "AMPN"
F 7 "Microchip" H 8150 4750 50 0001 C CNN "AManufacturer"
F 8 "296-39062-1-ND" H 8150 4750 50 0001 C CNN "DPN"
F 9 "IC REG LINEAR 1.2V 250MA SOT23-5" H 0 0 50 0001 C CNN "Description"
F 10 "X" H 8150 4750 50 0001 C CNN "DNP"
1 8150 4750
1 0 0 -1
$EndComp
@ -1322,12 +1323,13 @@ L Device:C_Small C19
U 1 1 5BDC7C63
P 8550 4600
F 0 "C19" H 8650 4650 50 0000 L CNN
F 1 "0805, 1uF, 10V, X5R, 20%" H 8000 4800 50 0000 L CNN
F 1 "0805, 1uF, 10V, X5R, 20% (DNP)" H 7850 4800 50 0000 L CNN
F 2 "tomu-fpga:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 8550 4600 50 0001 C CNN
F 3 "" H 8550 4600 50 0001 C CNN
F 4 "ANY" H 6050 2050 50 0001 C CNN "MPN"
F 5 "ANY" H 6050 2050 50 0001 C CNN "MYPN"
F 6 "ANY" H 6050 2050 50 0001 C CNN "Manufacturer"
F 7 "X" H 8550 4600 50 0001 C CNN "DNP"
1 8550 4600
1 0 0 -1
$EndComp
@ -1336,12 +1338,13 @@ L Device:C_Small C16
U 1 1 5BDC7CFF
P 7550 4750
F 0 "C16" H 7600 4850 50 0000 L CNN
F 1 "0805, 1uF, 10V, X5R, 20%" V 7400 4350 50 0000 L CNN
F 1 "0805, 1uF, 10V, X5R, 20% (DNP)" V 7400 4050 50 0000 L CNN
F 2 "tomu-fpga:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 7550 4750 50 0001 C CNN
F 3 "" H 7550 4750 50 0001 C CNN
F 4 "ANY" H 7550 4750 50 0001 C CNN "MPN"
F 5 "ANY" H 7550 4750 50 0001 C CNN "Manufacturer"
F 6 "ANY" H 6650 2150 50 0001 C CNN "MYPN"
F 7 "X" H 7550 4750 50 0001 C CNN "DNP"
1 7550 4750
1 0 0 -1
$EndComp
@ -1401,8 +1404,8 @@ Wire Wire Line
Connection ~ 8450 5000
Wire Wire Line
8450 5000 7550 5000
Text Notes 9300 4250 0 50 ~ 0
Note: Only populate regulator or filter circuit\nDo not populate both!
Text Notes 9300 4450 0 50 ~ 0
Note: Only populate regulator or filter circuit\nDo not populate both!\nThe Regulator circuit causes the ESD network\nto dump the regulator to GND, burning all\n250 mA of power, so please avoid it.
$Comp
L Device:C_Small C27
U 1 1 5BECECF0