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Type-C application using PI3USB30532 and PI3USB31532
By Paul Li
Table of Content
1.0 Introduction 2.0 Why passive MUX (PI3USB3X532) is better than active MUX in notebook design? 3.0 PI3USB3X532 in source-host: Notebook, tablet, AIO and desktop PC 4.0 What are the recommended maximum traces for PI3USB3X532 in Intel notebook design? 5.0 PI3USB3X532 in sink-device: Monitor and HDTV 6.0 PI3USB3X532 in sink-device: Docking station 7.0 The I2C control of PI3USB3X532 8.0 Power and power de-coupling 9.0 Layout guideline 10.0 Appendix: application Reference Schematics
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1.0 Introduction The PI3USB30532, PI3USB31532 type-C cross switch family is developed using cutting-edge technology to achieve high performance of DP 1.2, DP 1.3, USB 3.0, USB 3.1 signals in type-C applications. PI3USB3X532 is fully compliant to type- C specifications. PI3USB3X532 was first to the market and successfully designed in many and various applications, such as notebook, tablet, AIO, PC, monitor, HDTV, docking stations, etc. PI3USB3X532 was also designed in Intel reference schematic and designed in Intel customer reference demonstration tablet.
2.0 Why passive MUX (PI3USB3X532) is better than active MUX in notebook design? The market requests notebooks:
Running for 6-8 hours in battery operation
Boot-up after power-off for 6-8 days
Intel mobile CPU/chipset can now achieve 6W power consumption, thus:
The ~0.4W to ~0.6W power consumption from an active MUX is way too high and not reasonable.
Especially when compared to the <0.003W power consumption from PI3USB3X532, which is a 99% power saving compared to an
active MUX.
3.0 PI3USB3X532 in source-host: Notebook, tablet, AIO and desktop PC
Figure 1, PI3USB30532, PI3USB31532 in notebook, tablet all-in-one and desktop PC
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4.0 What are the recommended maximum traces for PI3USB3X532 in Intel notebook design? 4.1 DP 1.2, DP 1.3 In Intel Kabylake design guideline, Intel recommends maximum 8” DP 1.2 trace without passive MUX and 4.1” with passive MUX as to pass
DP 1.2 compliance test.
Intel deducted 3.9” trace from the 8” DP 1.2 trace for the passive MUX, which is conservative for a high performance passive MUX such as
PI3USB3X532, as explained in figure 2, figure 3a, figure 3b and in table-1 below.
Based on the PI3USB30532 DP 1.2 eye compliance test results in figure 3a and figure 3b, as well the trace data in figure 2 and table-1, it is
recommended as below.
Maximum 6.2” trace for DP 1.2 (5.4Gbps) path, as:
Intel DP 1.2 source PI3USB3X532 type-C connector
Maximum 4.0” trace for DP 1.3 (8Gbps) path, as:
Intel DP 1.3 source PI3USB31532 type-C connector
(Assuming the layout and schematics are as recommended as using 90ohm traces without chokes, etc., and in reasonable system
conditions)
4.2 USB3.0, USB3.1 Based on the PI3USB30532 USB 3.0 eye compliance test results in figure 4a and figure 4b, as well the trace data in figure 2 and table-1, it is
recommended as below.
Maximum 8.5” trace for USB3.0 (5Gbps) path, as:
USB3.0 host PI3USB3X532 type-C connector
Maximum 4.5” trace for USB3.1 (10Gbps) path, as:
USB3.1 host PI3USB31532 type-C connector
(Assuming the layout and schematics are as recommended below and in reasonable system conditions)
Table 1 the insertion loss of PI3USB3X532 versus Intel trace board
Insertion
loss of 3”
trace on
Intel trace
board
Per inch
PI3USB30532 PI3USB31532
30532:
Insertion
loss
30532:
equivalent trace
length (loss of
30532/1” trace)
30532: good-
max DP 1.2
trace in Intel
8” trace
topology
31532:
Insertion
loss
31532:
equivalent trace
length (loss of
31532/1” trace)
31532: good-
max DP 1.2
trace in Intel
8” trace
topology
Insertion loss
at 5Gbps (USB3.0)
-2.1db -0.70db -1.2db 1.71”
(1.2db/0.70db)
NA -1.06db 1.51”
(1.06db/0.70db)
NA
Insertion loss at
5.4Gbps (DP1.2)
-2.3db -0.77db -1.3db 1.69”
(1.3db/0.77db)
6.31”
(8”-1.69”)
-1.23db 1.60”
(1.23db/0.77db)
6.40”
(8”-1.60”)
Insertion loss at
8Gbps (DP1.3)
-3.2db -1.07db NA NA NA -1.63db 1.52”
(1.63db/1.07db)
NA
Insertion loss at
10Gbps (USB3.1)
-3.96db -1.32db NA NA NA -1.68db 1.27”
(1.68db/1.32db)
NA
Table 1 the insertion loss of the 3” FR4 differential trace was measured using Intel trace board and Agilent N5230A 20GHz Network
Analyzer, as setup in figure-2.
Note:
The data above is not linear, because the performances vary with different switch-routings and signal-types between PI3USB30532
and PI3USB31532, while PI3USB31532 has better performance than PI3USB30532 mostly at higher speed.
NA is for not applicable.
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4.3 The insertion loss of 3” differential trace on Intel trace board
Figure 2 the insertion loss of 3” FR4 differential trace on Intel trace board is measured using Agilent N5230A 20GHz Network Analyzer (chart by James Liu)
4.4 The PI3USB30532 Intel Haswell MB DP 1.2 eye compliance test result
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Figure 3a the eye of DP 1.2 (5.4Gbps) compliance test using PI3USB30532 setup (figure 3b) with Asus H97i-plus MB (Intel Haswell) and 7” trace passed the DP 1.2 HBR2 compliance test 3.1 using Tektronix scope at 400mV, 3.5db pre-emphasis. The upper waveform is at T3 with emulation cable in scope. The lower waveform is at T2 without emulation cable (waveform by Jerry Chou).
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4.5 The test setup of 4.4
Figure 3b the test setup of PI3USB30532 with 7” trace (2.8”+3.9”+0.3”) using Intel Haswell DP 1.2 source passed DP 1.2 (5.4Gbps) eye compliance test 3.1 as in figure 3a
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Figure 4a the Tx and Rx eyes passed the USB 3.0 (5Gbps) compliance test at the USB 3.0 connector of notebook (Intel Haswell) without PI3USB30532 EV board. To be compared to figure 4b with PI3USB30532 EVB (waveform by Jerry Chou)
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Figure 4b the Tx and Rx eyes passed USB 3.0 (5Gbps) compliance test with 10.2” trace (5.5”+3.3”+1.4”) using notebook (Intel Haswell) and PI3USB30532 EV board. To be compared to figure 4a without PI3USB30532 EV board (waveform by Jerry Chou).
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5.0 PI3USB3X532 in sink-device: Monitor and HDTV
Figure 5, PI3USB30532, PI3USB31532 in monitor and HDTV
No active DP re-driver and USB3.0 re-driver needed in type-C MUX (PI3USB30532) or between the switches in cascading
(PI3USB30532, PI3WVR12412, PI3PCIE3242).
o Because there are sufficient total source and sink equalization, as:
Up to 9db output pre-emphasis (equalization) in DP source and USB3.0 Tx
Up to 9db input equalization in DP scalar and USB3.0 Rx receiver.
o The total 18db equalization in source and sink is sufficient to compensate the estimated total insertion loss from
the topology in figure 5:
Max 7.7db from total 10” traces
Max 4db from 2m type-Cable
Max 1.5db from PI3USEB30532
Max 1.5db from PI3WVR12412 or PI3PCIE3242
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6.0 PI3USB3X532 in sink-device: Docking station
Figure 6, PI3USB30532, PI3USB31532 in docking station
7.0 The I2C control of PI3USB3X532 PI3USB3X532 has total three I2C registers as Conf [2:0], which is mapped between the I2C control signals and the configuration tables
(source, sink) as in figure-7.
When using I2C interface to control PI3USB3X532, the I2C controller (in PD or MCU) will need sending total three bytes to PI3USB30532
in sequence as:
Start
#1 byte for address as “10101000” (assuming A1_A0 set to 00, while last 0 for write)”
#2 byte for chip-ID as fixed “00000000”
#3 byte for Conf [2:0] control as “00000111” (assuming Conf [2:0]=111 as for USB3+DPx2 swapped)
Stop (must have stop, otherwise uncertainty may occur)
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Figure 7, The I2C-control of the configuration table for source-sink (source-sink tables are the same)
I2C-controls PI3USB30532 in real application
For both source and sink applications, when a type-C plug is plugging into the source or sink type-C connectors with PI3USB30532 and PD,
the I2C controller (in PD or MCU) shall I2C-control PI3USB30532 as:
DPx4 only, non-swap:
Start 10101000 (last 0 for write) 0000000000000010stop
DPx4 only, swapped:
Start 10101000 0000000000000011stop
USB3.0 only, non-swap:
Start 10101000 0000000000000100stop
USB3.0 only, swapped:
Start 10101000 0000000000000101stop
USB3+DPx2, non-swap:
Start 10101000 0000000000000110stop
USB3+DPx2, swapped:
Start 1010100 0000000000000111stop
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8.0 Power and power de-coupling
Use 0.1uf in size of 0402 for all the Vdd (any power pins) pins of the IC device, as close to the Vdd pins as possible, within 2-3mm if
feasible.
Use dedicated Vdd and GND planes for to minimize the jitters coupled between channel trough power sources.
9.0 Layout guideline 9.1 Recommend 90 ohm differential impedance trace for differential DP and USB 3.0 signals
Figure 8, the trace width and clearance
Use 6-7-6 mils for trace-space-trace for the micro-strip lines (the traces on top and bottom layers) for 90 ohm differential
impedance.
Use 6-5-6 mils for trace-space-trace for the strip-lines (the traces inside layers) for 90 ohm differential impedance.
Use FR4.
Using standard 4 to 8 layers stack-up with 0.062 inch thick PCB.
For micro-strip lines, using ½ OZ Cu plated is ok.
For strip-lines in 6 plus players, using 1 OZ Cu is better.
The trace length miss-matching shall be less than 5 mils for the “+” and “–“ traces in the same pairs
More pair-to-pair spacing for minimal crosstalk
Target differential Zo of 90 ohm ±15%
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9.2 The PCB Layers Stackup
No new PCB technology required. Use FR4 is fine. Using standard 4 to 8 layers stack-up with 0.062 inch thick PCB. For micro strip lines, using ½ OZ Cu plated is ok. For strip line in 6 plus players, using 1 OZ Cu is better.
Figure 9, the stackup
Stack-up Plane Material Thickness (mil)
Solder mask Mask paint 1.2
Signal Copper 1.9
Prepreg 2116 4.4
Vcc Copper 1.4
Core 47
Vss Copper 1.4
Prepreg 2116 4.4
Signal Copper 1.9
Solder mask Mask paint 1.2
Total 62.4
9.3 The Layout Guidance for the Trace Routings
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Figure 10, The layout guidance for the trace routings
Don’t use EMI chokes, because PI3USB30532 and PI3USB31532 are passive switches not having EMI issues. The differential traces shall be away from the strong EMI source and devices, such as TTL, switching-power traces and
devices, with at least 30mil to 50mil space. No other components shall piggy ride on the differential traces.
10 Appendix: application Reference Schematics
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TX-
R662M
12
RX2+
RX1-
CONF0/A1
Use 0.22uf if output
swing >1.2V or using
re-drivers
C85 0.1u
KUSB-8-A-P-3-1-1-01-ST1,
R62 01 2
C82 0.2u
ADDR0
RX2-
DP sourceR61 01 2
PD controller RX1-
C68
0.1u
TX2-
AUX-
R54NC (for I2C)
12
TX2+
C73
0.1u
RX+
R652M
12
R64 01 2
TX1+
D3-
CONF2/SDA
C78 0.2u
C71
0.1u
CC1
C87 0.2u
PI3USB30532
U1
13121110987654
41
123
14
15
16
17
18
19
20
2122232425262728293031323334
35
36
37
38
39
40
VDDTX-/RX-TX+/RX+VDDDP3-DP3+VDDDP2-DP2+VDD
PG
ND
MODEDP1+DP1-
A0
GN
DR
X+
/TX
+R
X-/
TX
-G
ND
AUX
+A
UX
-
SBU2/SBU1SBU1/SBU2
VDDRX1-/TX1-
RX1+/TX1+VDD
TX1-/RX1-TX1+/RX1+
VDDTX2-/RX2-
TX2+/RX2+VDD
RX2-/TX2-RX2+/TX2+
CO
NF
0/A
1C
ON
F1
/SC
LG
ND
CO
NF
2/S
DA
DP
0+
DP
0-
D1-
D0-
C75
100uf
C84 0.1u
RX-
D2-
D2+
C81 0.2u
Vbus
control
R59 01 2
Type-C Recep.
J 6
A3B10
A4B9A5B8A6B7A7B6A8B5A9B4
A10B3
A11B2
A12B1
B11A2
B12A1
TX1-RX1-VBUSVBUSCC1SBU2D+D-D-D+SBU1CC2VBUSVBUSRX2-TX2-RX2+TX2+GNDGND
RX1+TX1+GNDGND
R67 100K1 2
+3V3
CONF1/
SCL
D3+
+3V3
TX1-
RX1+
C83 0.2u
CONF2/
SDA
C77 0.2u
C67
10u
TX2-
C69
0.1u
C72
0.1u
TX2+
CONF0/
A1
C70
0.1u
No-chokes between 30532 and type-C connector, because30532 is a passive switch without EMI issue.
TX1+
R53
NC
12
TX+
R55NC (for I2C)
12
PI3USB30532 reference schematic for source application
Vbus
control
RX1+
R56
4.7K
12
C86 0.2u
C74
0.1u
USB2 D+/-
C76 0.2u
Contact Diodes local sales for TVS
C76-C83 are "must have" to prevent non-DP compliant3.3V signals from plug-in as real-seen-case.
R58 01 2
R63 01 2
+3V3
R60 01 2
TVS
TVS
RX2+
+3V3
RX2-
R57 01 2
USB3controller
D1+
+3V3
D+
D0+
C80 0.2u
R68 100K1 2
Source
charging
circuit
D-
CC2
C79 0.2u
TX1-
See source truth table for
the control of CONF[2:0]
CONF1/SCL
AUX+
PI3USB30532 DFP-source reference schematic for type-C PD/DP/ALT application
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TX1+
D-
D2-
RX2+
PI3USB30532 reference schematic for sink application
C64 0.1u
R51 1M1 2
CONF0/A1
TX1+
D1-
R492M
12
RX1-
C48
0.1u
RX1+
TX2-
C54
100uf
R46NC (for I2C)
12
C50
0.1u
RX2-
DPreceiver
TX-
+3V3
C62 0.1u C63 0.2u
C65 0.2u
RX2-
D0+
RX1+
CC1
TX2+C55 0.2u
USB2 D+/-
R47NC (for I2C)
12
C57 0.2u
Vbus
control
RX+
CONF2/SDA
C66 0.2u
+3V3
PD controller
C60 0.2u
Contact Diodes local sales for TVS
Type-C Recep.
J 5
A3B10A4B9A5B8A6B7A7B6A8B5A9B4
A10B3
A11B2
A12B1
B11A2
B12A1
TX1-RX1-VBUSVBUSCC1SBU2D+D-D-D+SBU1CC2VBUSVBUSRX2-TX2-RX2+TX2+GNDGND
RX1+TX1+GNDGND
TX1-
AUX+
C61 0.2u
See sink truth table for
the control of CONF[2:0]
C46
10u
CC2
TX2+
D3-
C47
0.1u
No-chokes between 30532 and type-C connector, because30532 is a passive switch without EMI issue.
CONF1/SCL
RX1-
C58 0.2u
C52
0.1u
+3V3
AUX-
D0-
TVS
D+
RX-
C59 0.2u
+3V3
CONF1/
SCL
C53
0.1u
D1+
R502M
12
D3+
ADDR0
RX2+
Vbus
control
D2+
R45
NC
12R48
4.7K
12
C56 0.2u
C55-C61, C63 are "must have" to prevent non-DP compliant 3.3Vsignals from plug-in as real-seen-case.
Sink
charging
circuit
C49
0.1u
CONF0/
A1
+3V3
R52 1M1 2
USB3controller
TVS
PI3USB30532
U1
13121110987654
41
123
14
15
16
17
18
19
20
2122232425262728293031323334
35
36
37
38
39
40
VDDTX-/RX-TX+/RX+VDDDP3-DP3+VDDDP2-DP2+VDD
PG
ND
MODEDP1+DP1-
A0
GN
DR
X+
/TX
+R
X-/
TX-
GN
DA
UX
+A
UX
-
SBU2/SBU1SBU1/SBU2
VDDRX1-/TX1-
RX1+/TX1+VDD
TX1-/RX1-TX1+/RX1+
VDDTX2-/RX2-
TX2+/RX2+VDD
RX2-/TX2-RX2+/TX2+
CO
NF0
/A1
CO
NF1
/SC
LG
ND
CO
NF2
/SD
AD
P0
+D
P0
-
KUSB-8-A-P-3-1-1-01-ST1,
C51
0.1u
TX2-
CONF2/
SDA
TX+
TX1-
PI3USB30532 UFP-sink reference schematic for type-C PD/DP/ALT application
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PI3USB31532 DFP-source reference schematic for type-C PD/DP/ALT application
D3+
KUSB-8-A-P-3-1-1-01-ST1,
Contact Diodes local sales for TVS
AUX-
RX-
C1260.1u
C109
10u
+3V3
USB2 D+/-
Use 0.22uf if output
swing >1.2V or using
re-drivers
TX1-
TX1-
TX1+
C111
0.1u
TVS
RX1+
C117
100uf
C116
0.1u
C1220.2u
R381270K
12
CONF2/SDA
No-chokes between 31532 and type-C connector, because31532 is a passive switch without EMI issue.
TX+ R92 100K1 2
R84 01 2
AUX+
C110
0.1u
D2-
C1290.2u
CC1TX1+
C1210.2u
C112
0.1u
PD controller
RX2+
TX2+
C114
0.1u
RX1-
DP source
D0-
R380NC
12
TX2+
D3-
RX1+
R81 01 2
+3V3
D+
CONF2/
SDA
RX+
R82 01 2
D-
C1190.2u
Type-C Recep.
J 8
A3B10
A4B9A5B8A6B7A7B6A8B5A9B4
A10B3
A11B2
A12B1
B11A2
B12A1
TX1-RX1-VBUSVBUSCC1SBU2D+D-D-D+SBU1CC2VBUSVBUSRX2-TX2-RX2+TX2+GNDGND
RX1+TX1+GNDGND
Vbus
control
RX2-
R78NC (for I2C)
12
RX2+
R83 01 2
R79NC (for I2C)
12
R87 01 2
RX1-
Source
charging
circuit
D1+
D2+
ADDR0
C118-C125 are "must have" to prevent non-DP compliant 3.3Vsignals from plug-in as real-seen-case.
TVS
+3V3
R902M
12
D1-
R91 100K1 2
C1180.2u
TX2-
PI3USB31532 reference schematic for source application
USB3controller
C115
0.1u
+3V3
CONF1/SCL
RX2-
R80
4.7K
12
C1270.1u
C1250.2u
C1280.2u
C1240.2u
D0+
CONF0/
A1
R88 01 2
PI3USB31532
U1
13121110
987654
41
123
14
15
16
17
18
19
20
2122232425262728293031323334
35
36
37
38
39
40
MODE1TX-/RX-TX+/RX+VDDDP3-DP3+VDDDP2-DP2+VDD
PG
ND
MODEDP1+DP1-
A0
GN
DR
X+
/TX
+R
X-/
TX
-G
ND
AUX
+A
UX
-
SBU2/SBU1SBU1/SBU2
VDDRX1-/TX1-
RX1+/TX1+VDD
TX1-/RX1-TX1+/RX1+
VDDTX2-/RX2-
TX2+/RX2+VDD
RX2-/TX2-RX2+/TX2+
CO
NF
0/A
1C
ON
F1
/SC
LG
ND
CO
NF
2/S
DA
DP
0+
DP
0-
R892M
12
See source truth table for
the control of CONF[2:0]
TX-
Vbus
control
R85 01 2
CONF1/
SCL
TX2-
+3V3
CC2
R77
NC
12
C1200.2u
C1230.2u
R86 01 2
C113
0.1u
+3V3
CONF0/A1
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PI3USB31532 UFP-sink reference schematic for type-C PD/DP/ALT application
TX1-
+3V3
CONF1/SCL
D-
C96
100uf
PI3USB31532 reference schematic for sink application
C91
0.1u
USB2 D+/-
+3V3
C92
0.1u
CC1
R732M
12
TX2-
R742M
12
C99 0.2u
C1000.2u
CONF0/A1
TX2+
TX1+
R75 1M1 2
RX1+
+3V3
D2+
Vbus
control
TX-
C88
10u
D0+
AUX-
C1040.1u
D3-
C1060.1u
D0-
R76 1M1 2
PD controllerSee sink truth table for
the control of CONF[2:0]
R72
4.7K
12
DPreceiver
RX-
C90
0.1u
+3V3
C97-C103, C105 are "must have" to prevent non-DP compliant 3.3Vsignals from plug-in as real-seen-case.
RX1-
PI3USB31532
U1
13121110987654
41
123
14
15
16
17
18
19
20
2122232425262728293031323334
35
36
37
38
39
40
MODE1TX-/RX-TX+/RX+VDDDP3-DP3+VDDDP2-DP2+VDD
PG
ND
MODEDP1+DP1-
A0
GN
DR
X+
/TX
+R
X-/
TX-
GN
DA
UX
+A
UX
-
SBU2/SBU1SBU1/SBU2
VDDRX1-/TX1-
RX1+/TX1+VDD
TX1-/RX1-TX1+/RX1+
VDDTX2-/RX2-
TX2+/RX2+VDD
RX2-/TX2-RX2+/TX2+
CO
NF0
/A1
CO
NF1
/SC
LG
ND
CO
NF2
/SD
AD
P0
+D
P0
-
D3+
CONF1/
SCL
R71NC (for I2C)
12
R280NC
12
C97 0.2u
RX2-
C94
0.1u
Vbus
control
CONF2/SDA
CC2
No-chokes between 31532 and type-C connector, because31532 is a passive switch without EMI issue.
TX2-
C1050.2u
R281270K
12 Type-C Recep.
J 7
A3B10A4B9A5B8A6B7A7B6A8B5A9B4
A10B3
A11B2
A12B1
B11A2
B12A1
TX1-RX1-VBUSVBUSCC1SBU2D+D-D-D+SBU1CC2VBUSVBUSRX2-TX2-RX2+TX2+GNDGND
RX1+TX1+GNDGND
+3V3
C95
0.1u
CONF2/
SDA
RX+
C1020.2u
TVS
C89
0.1u
C1030.2u
C1010.2u
AUX+
R70NC (for I2C)
12
RX1+
TX2+
C93
0.1u
CONF0/
A1
KUSB-8-A-P-3-1-1-01-ST1,
D1-
RX2+
R69
NC
12
Contact Diodes local sales for TVS
D2-
+3V3
C98 0.2u
Sink
charging
circuit
RX1-
TVS
USB3controller
TX+
TX1-
C1070.2u
C1080.2u
D1+
TX1+
RX2-
RX2+
D+
ADDR0
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