Understanding D2 Functionality

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BOM
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D2

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Looking for "General description" in 82400102.pdf

D2 is a dual-channel transient-voltage-suppressor (TVS) diode (Würth Elektronik WE-TVS-82400102) placed across the USB data lines to protect against ESD and surge events. Key details:

Table

FeatureSpecification
FunctionESD/surge protection for USB D+ and D– lines
Topology2 channels + common cathode (2 + 1)
Clamping Voltage (typ.)7.7 V at 1 A (Transmission Line Pulsing)
Peak Pulse Current (8/20 µs)6 A
PackageSOT-23-6L
Operating Temperature–55 °C to +125 °C
ComplianceIEC 61000-4-2, ‑4, and ‑5
DatasheetDatasheet (PDF)
By clamping any fast voltage spikes on USB1’s DP and DN nets to ground, this part safeguards the CH340C USB interface and downstream circuitry against electrostatic discharge and other transient overvoltages.
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ESP_RX
ESP_RX
SDA
ESP_TX
CAM_PWDN
SDA
GPIO15
CAM_D7
CAM_D7
CAM_D4
GPIO15
GPIO14
CAM_D5
CAM_D3
CAM_RST
CAM_MCLK
ESP_IO0
CAM_D1
CAM_D0
GPIO13
GPIO4
GPIO13
SCL
GPIO12
SCL
GPIO14
CAM_PCLK
SDA
GPIO33
CAM_D6
CAM_RST
GPIO4
GPIO12
CAM_VSYNC
ESP_EN
CAM_D2
CAM_D3
CAM_PWDN
GPIO2
GPIO2
CAM_VSYNC
CAM_PCLK
CAM_MCLK
CAM_D5
SCL
CAM_PCLK
CAM_D4
GPIO33
ESP_EN
CAM_D1
ESP_TX
CAM_HSYNC
ESP_EN
CAM_D2
CAM_HSYNC
CAM_PWDN
ESP_IO0
CAM_D6
CAM_D0
C4
Capacitance
10u F
+3V3
C18
Capacitance
10u F
R8
Resistance
4.7k Ω
+3V3
R1
Resistance
10k Ω
C17
Capacitance
10u F
C16
Capacitance
0.1u F
C7
Capacitance
0.1u F
C15
Capacitance
10u F
C8
Capacitance
10u F
ESP1
+3V3
+5V
J3
R5
Resistance
1k Ω
C6
Capacitance
0.1u F
RST
+3V3
U3
+2V8
+2V8
C10
Capacitance
0.1u F
+3V3
C12
Capacitance
0.1u F
C14
Capacitance
0.1u F
C19
Capacitance
0.1u F
+3V3
+1V2
+1V2
+3V3
+3V3
OV2640
R6
Resistance
4.7k Ω
BOOT
C11
Capacitance
10u F
U2
R7
Resistance
4.7k Ω
C13
Capacitance
15p F
+3V3
+3V3
J1
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WiFi Camera Reference Design

WiFi Camera Reference Design
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Last updated by vasy_skral
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vasy_skral

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