Understanding D2 Functionality

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Schematic

Layout

3D View

C4
Capacitance
10uF
C18
Capacitance
10uF
C17
Capacitance
10uF
C16
Capacitance
0.1uF
C7
Capacitance
0.1uF
C15
Capacitance
10uF
C8
Capacitance
10uF
C6
Capacitance
0.1uF
C10
Capacitance
0.1uF
C12
Capacitance
0.1uF
C14
Capacitance
0.1uF
C19
Capacitance
0.1uF
C11
Capacitance
10uF
C13
Capacitance
15pF
+3V3
+3V3
+3V3
ESP1
+3V3
+5V
+3V3
+2V8
+2V8
+3V3
+3V3
+1V2
+1V2
+3V3
+3V3
+3V3
+3V3
J3
U3
U2
J1
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
RST
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
BOOT
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
R8
Resistance
4.7kΩ
R1
Resistance
10kΩ
R5
Resistance
1kΩ
OV2640
R6
Resistance
4.7kΩ
R7
Resistance
4.7kΩ

WiFi Camera Reference Design