board/pd_blocker.sch

v 20211219 2
C 0 -700 1 0 0 title.sym
{
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date=$date$
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org=CuVoodoo
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authors=King Kévin
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title=USB-C Power Delivery blocker
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version=$version$
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revision=$revision$
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licence=CERN-OHL-S
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device=none
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footprint=none
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C 3500 1900 1 0 0 chassis.sym
C -2900 1800 1 0 0 chassis.sym
C -4400 1900 1 0 0 GND.sym
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C 2000 1900 1 0 0 GND.sym
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{
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{
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{
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netname=CC2
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N 800 3300 0 3300 4
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netname=RX2-
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N 800 3100 0 3100 4
{
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C -5200 400 1 270 1 C0603.sym
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footprint=CAPC1608X92N.lht
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refdes=C2
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device=C0603
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value=100nF
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C -5400 400 1 90 0 C0603.sym
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refdes=C1
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C -5000 200 1 0 0 GND.sym
C -5800 200 1 0 0 GND.sym
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netname=CC2
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netname=CC1
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capacitors block PD communication
by smoothing out the 300 Kpbs signal,
but still permits Rx identification
C -1400 6100 1 0 0 LM393D_part-1-2-COMP1.sym
{
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refdes=U1
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device=LM393D
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lcsc=C2977085
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C 4800 6100 1 0 1 LM393D_part-2-2-COMP2.sym
{
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refdes=U1
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device=LM393D
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lcsc=C2977085
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C 400 7800 1 270 1 40P05.sym
{
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refdes=Q1
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device=40P05
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lcsc=C2886385
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C 600 8100 1 90 0 ZENER.sym
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refdes=Z2
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device=ZENER
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value=16V
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description=diode, zener
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lcsc=C2832584
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C 700 7800 1 270 0 resistor-1.sym
{
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device=RESISTOR
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refdes=R4
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value=100k
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footprint=UC1608X55N.lht
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description=resistor, chip, 0603 (metric 1608), 1%
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C -400 5900 1 0 0 GND.sym
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{
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netname=VBUS1
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N 400 8500 400 8800 4
C -1800 6200 1 270 1 ZENER.sym
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refdes=Z1
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device=ZENER
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value=4.7V
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lcsc=C2832571
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C -1700 5900 1 0 0 GND.sym
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{
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netname=VREF1
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R3 ≤ (Vsupply_min - Vzener) / Ileakage 
R3 ≤ (4.75 - 4.7) / 2E-6 = 25k
C -1700 8400 1 270 0 resistor-1.sym
{
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device=RESISTOR
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refdes=R3
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value=20k
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footprint=UC1608X55N.lht
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description=resistor, chip, 0603 (metric 1608), 1%
}
N -1600 8400 -1600 8800 4
T -6500 8700 9 10 1 0 0 0 2
Vgs limit (± 20V) never reached because
pulled low only when VBUS ≤ 5.5V
T -6500 7500 9 10 1 0 0 0 2
divider_ratio = Vref / Vover
divider_ratio = 4.7 / 5.5 = 0.8545
C -2100 8400 1 270 0 resistor-1.sym
{
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device=RESISTOR
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refdes=R1
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value=5k1
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footprint=UC1608X55N.lht
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description=resistor, chip, 0603 (metric 1608), 1%
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C -2100 7000 1 270 0 resistor-1.sym
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device=RESISTOR
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refdes=R2
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value=30k
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footprint=UC1608X55N.lht
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description=resistor, chip, 0603 (metric 1608), 1%
}
T -6500 7200 9 10 1 0 0 0 1
R2/(R1+R2) = 30/(5.1+30) = 0.8547
C -2100 5900 1 0 0 GND.sym
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N -1400 7000 -2000 7000 4
{
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netname=VOVER1
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N -2000 8800 -2000 8400 4
C 3000 7800 1 90 0 40P05.sym
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refdes=Q2
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device=40P05
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lcsc=C2886385
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C 2800 8100 1 270 1 ZENER.sym
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device=ZENER
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refdes=Z3
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value=16V
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description=diode, zener
T 2800 8100 5 10 0 1 0 0 1
lcsc=C2832584
}
C 2700 7800 1 90 1 resistor-1.sym
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refdes=R5
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value=100k
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description=resistor, chip, 0603 (metric 1608), 1%
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C 3800 5900 1 0 1 GND.sym
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N 3000 8500 3000 8800 4
C 5200 6200 1 90 0 ZENER.sym
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lcsc=C2832571
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refdes=Z4
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value=4.7V
}
C 5100 5900 1 0 1 GND.sym
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{
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C 5100 8400 1 90 1 resistor-1.sym
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value=20k
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N 5000 8400 5000 8800 4
C 5500 8400 1 90 1 resistor-1.sym
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value=5k1
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}
C 5500 7000 1 90 1 resistor-1.sym
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refdes=R8
T 5600 6300 5 10 1 1 0 0 1
value=30k
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C 5500 5900 1 0 1 GND.sym
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netname=VBUS
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C -1200 -800 1 0 0 HEADER-2.54-1x10.sym
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footprint=CONNECTOR_HEADER-2.54-1X10.lht
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refdes=J3
T -600 -760 5 10 0 1 0 5 1
device=HEADER-2.54-1x10
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value=DEBUG
}
C -1400 1400 1 270 0 GND.sym
N -1200 1100 -1900 1100 4
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N -1200 900 -1900 900 4
{
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netname=VREF1
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N -1200 500 -1900 500 4
{
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netname=CC2
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N -1200 700 -1900 700 4
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netname=VOVER1
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N -1200 -500 -1900 -500 4
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N -1200 100 -1900 100 4
{
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netname=CC1
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N -1200 -100 -1900 -100 4
{
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netname=VOVER2
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N -1200 -300 -1900 -300 4
{
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netname=VREF2
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N -1200 300 -1900 300 4
{
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netname=VBUS
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C 800 2300 1 0 0 XKB_U262-24XN-4BV60.sym
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footprint=CONNECTOR_XKB_U262-24XN-4BV60.lht
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refdes=J2
T 3760 2640 5 10 1 1 0 2 1
device=XKB_U262-24XN-4BV60
T 3300 5000 5 10 1 1 0 0 1
value=USB-C receptacle
T 3600 4000 5 10 0 1 0 0 1
lcsc=C388659
}
C -5600 2300 1 0 0 XKB_U261-24XN-4BC2LS.sym
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refdes=J1
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device=XKB_U261-24XN-4BC2LS
T -5600 2300 5 10 0 0 0 0 1
lcsc=C2880648
T -3000 5000 5 10 1 1 0 0 1
value=USB-C plug
}
N -2700 2100 -2700 2300 4
N -2900 2100 -2900 2300 4
N -3100 2100 -3100 2300 4
T -6500 9900 9 10 1 0 0 0 1
over-voltage protection
T -6500 1500 9 10 1 0 0 0 1
communication protection
T -6500 9300 9 10 1 0 0 0 2
two pMOS are required to
block VBUS in both direction
C -1300 9700 1 0 0 BAV74_part-1-2-D1.sym
{
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refdes=D1
T -1100 9740 5 10 1 1 0 5 1
device=BAV74
}
C -100 9700 1 0 1 BAV74_part-2-2-D2.sym
{
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footprint=SOT95P237X112-3N.lht
T -300 10060 5 10 1 1 0 3 1
refdes=D1
T -300 9740 5 10 1 1 0 5 1
device=BAV74
}
T -6500 8100 9 10 1 0 0 0 2
diodes prevent VBUS
cross-leakage
C -900 9900 1 0 0 VCC.sym
N -1300 9900 -2000 9900 4
{
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netname=VBUS1
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N -900 9900 -500 9900 4
N -100 9900 600 9900 4
{
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netname=VBUS2
}
C 3500 7700 1 0 0 VCC.sym
C -500 7700 1 0 0 VCC.sym