Schematic Symbol for [Example] ESP32 Reference Design: An example...

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please explain what C1 does.

kaushlendra05

@copilot please explain what C1 does.

copilot

Sure! In your project, C1 is a capacitor with a capacitance of 0.1 µF. It's connected as follows:

Pin 1 is connected to L1:P1, U3:SW, and Net.
Pin 2 is connected to U3:VBST and Net.

Role of C1

Decoupling/BYPASS Capacitor:
- Stabilizes Voltage: The capacitor helps to stabilize the voltage supply to the TPS564201DDCR IC (U3). By providing a local reservoir of charge, it can smooth out fluctuations and supply transient currents, improving the performance of the IC.
- Noise Reduction: It filters out noise that may be present on the power line, ensuring that the IC receives a clean and stable supply voltage. This is particularly important if the supply line has high-frequency noise.
Boost Capacitor (Bootstrap Capacitor):
- In this circuit, C1 is likely serving as a bootstrap capacitor for the TPS564201DDCR IC. The bootstrap capacitor is essential for providing the necessary voltage to drive the high-side MOSFET gate.

Summary

Type: 0.1 µF capacitor
Primary Functions: Voltage stabilization, noise filtering, and enabling high-side MOSFET gate drive
Connections: Connected to the switching node (SW) and boost terminal (VBST) of the TPS564201DDCR to facilitate proper operation of the buck converter.

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Resistance

10k Ω

SDA

AIN0

ESP_IO18

Resistance

4.7k Ω

ESP_IO27

SCL

ESP_IO4

ESP_IO32

ESP_IO13

ESP_IO33

ESP_RX

ESP_IO2

SDA

ESP_IO35

Resistance

4.7k Ω

Resistance

5.1K Ω

ESP_IO23

USB_D-

ESP_IO5

ESP_IO25

ESP_IO14

ESP_SD0

ESP_IO0

ESP_CLK

ESP_TX

USB_D+

ESP_IO16

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USB_D-

ESP_IO17

Resistance

4.7k Ω

ESP_IO15

ESP_SD3

Resistance

33.2K Ω

USB_D+

ESP_IO26

AIN1

AIN3

RST

SCL

ESP_IO12

ESP_SD2

USB_D-

ESP_SD1

ESP_IO34

AIN2

Resistance

10k Ω

SCL

ESP_IO19

USB_D+

VUSB

+3V3

VUSB

+3V3

VIN

+3V3

Capacitance

=10u F

+3V3

Capacitance

0.1u F

R10

Resistance

10k Ω

+3V3

Inductance

=2.2u H

+3V3

Capacitance

0.1u F

+3V3

Capacitance

22u F

+3V3

Capacitance

0.1u F

Capacitance

10u F

Capacitance

10u F

Resistance

10K Ω

+3V3

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Electrical Rule Checks

Duplicate Designators • 68

	Components
	A3, A3
	ESP_IO39, ESP_IO39
	VIN, VIN, VIN
	SDA, SDA, SDA, SDA
	AIN0, AIN0
	ESP_IO18, ESP_IO18
	VUSB, VUSB, VUSB
	PWM5, PWM5
	A5, A5
	+3V3, +3V3, +3V3, +3V3, +3V3, +3V3, +3V3, +3V3, +3V3, +3V3, +3V3, +3V3, +3V3, +3V3, +3V3, +3V3, +3V3, +3V3, +3V3
	ESP_IO27, ESP_IO27
	B1, B1
	B3, B3
	SCL, SCL, SCL, SCL
	PWM15, PWM15
	A6, A6
	ESP_IO36, ESP_IO36
	A4, A4
	ESP_IO4, ESP_IO4
	B5, B5
	PWM1, PWM1
	ESP_IO32, ESP_IO32
	ESP_IO14, ESP_IO14
	ESP_IO13, ESP_IO13
	A0, A0
	PWM13, PWM13
	PWM10, PWM10
	ESP_IO5, ESP_IO5, ESP_IO5
	AIN3, AIN3
	ESP_IO25, ESP_IO25
	PWM2, PWM2
	ESP_EN, ESP_EN, ESP_EN
	ESP_IO16, ESP_IO16
	A1, A1
	AIN1, AIN1
	ESP_IO33, ESP_IO33
	PWM11, PWM11
	ESP_RX, ESP_RX
	A2, A2
	A7, A7
	B2, B2
	PWM0, PWM0
	ESP_IO2, ESP_IO2, ESP_IO2
	PWM9, PWM9
	B7, B7
	ESP_IO35, ESP_IO35
	ESP_IO23, ESP_IO23
	ESP_IO0, ESP_IO0, ESP_IO0, ESP_IO0
	ESP_TX, ESP_TX, ESP_TX
	PWM6, PWM6
	USB_D-, USB_D-, USB_D-
	B6, B6
	ESP_IO12, ESP_IO12
	PWM7, PWM7
	AIN2, AIN2
	USB_D+, USB_D+, USB_D+
	PWM14, PWM14
	ESP_IO34, ESP_IO34
	B0, B0
	ESP_IO17, ESP_IO17
	ESP_IO15, ESP_IO15
	ESP_IO19, ESP_IO19
	ESP_IO26, ESP_IO26
	PWM12, PWM12
	PWM3, PWM3
	PWM8, PWM8
	B4, B4
	PWM4, PWM4

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Ground
A common return path for electric current. Commonly known as ground.
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