Schematic for ATtiny85 Phone Charge Guard: The ATtiny45/85 USB...

Funzionamento Circuito Carica USB

w0rciup

spiega in modo semplice cosa fa il circuito

215 days

flux

0:50

General (prev)

Project

IC1

Il circuito agisce da “guardiano” della carica USB per il tuo telefono, monitorando e controllando automaticamente il flusso di corrente:

– L’alimentazione entra dal connettore J2 e passa attraverso il sensore di corrente IC1 (INA219), che misura tensione e corrente erogata al telefono.
– Il microcontrollore U1 (ATtiny85) legge questi dati via I²C e, se i valori superano soglie prestabilite, comanda il MOSFET di potenza Q2 per interrompere o riattivare la carica.
– Un regolatore di tensione U2 (HT7533) fornisce 3,3 V stabili a [U1], [IC1] e al display OLED OLED1, sul quale vengono visualizzati in tempo reale tensione, corrente e stato di carica.
– Alcuni pulsanti sul pannello consentono all’utente di interagire con il sistema (ad esempio impostare soglie o visualizzare dati storici).

In sintesi, il circuito protegge la batteria del telefono misurando costantemente tensione e corrente e interrompendo la carica in caso di anomalie.

215 days

Ready.

Resistance

10K Ω

Resistance

10K Ω

Resistance

10K Ω

Resistance

10K Ω

IC1

Resistance

10K Ω

R10

Resistance

10K Ω

Resistance

10K Ω

Resistance

10K Ω

Resistance

10K Ω

VCC

I2C_SCL

VIN

VSW

VCC

RESET

OLED1

I2C_SCL

VCC

I2C_SDA

Capacitance

100n F

VCC

VIN

RESET

POWER OUT

VCC

POWER OUT

KEY

VCC

KEY

Capacitance

100n F

VCC

Capacitance

10u F

VSW

VCC

End of Life

I2C_SDA

I2C_SCL

Capacitance

47u F

VCC

I2C_SDA

Resistance

8m Ω

Reviews

Electrical Rule Checks

Missing Footprints

Reports parts that have no footprint.

Design Rule Checks

Overlapping Copper • 193

Des	Net	Des	Net
Trace 2c68	GND	SW2:P2	None
Trace 26ca	GND	SW4:P2	None
Trace 4938	GND	C1:P1	None
Trace a972	GND	SW2:P2	None
Trace 0a22	Net (IC1 - VIN-)	R10:P2	None
Trace 0a57	Net (IC1 - VIN-)	R7:P1	None
Trace 0ddb	Net (IC1 - VIN-)	R7:P1	None
Trace 2b62	Net (IC1 - VIN-)	Q2:D	None
Trace 3ad4	Net (IC1 - VIN-)	R7:P1	None
Trace 4aca	Net (IC1 - VIN-)	R7:P1	None
Trace 6f25	Net (IC1 - VIN-)	R7:P1	None
Trace 9e12	Net (IC1 - VIN-)	Q2:D	None
Trace 253c	Net (IC1 - VIN-)	R10:P2	None
Trace 577d	Net (IC1 - VIN-)	Q2:D	None
Trace 577d	Net (IC1 - VIN-)	R7:P1	None
Trace 652a	Net (IC1 - VIN-)	R7:P1	None
Trace 972d	Net (IC1 - VIN-)	R7:P1	None
Trace 6493	Net (IC1 - VIN-)	Q2:D	None
Trace a33c	Net (IC1 - VIN-)	Q2:D	None
Trace be41	Net (IC1 - VIN-)	R7:P1	None
Trace cdf0	Net (IC1 - VIN-)	R7:P1	None
Trace cf32	Net (IC1 - VIN-)	R7:P1	None
Trace da77	Net (IC1 - VIN-)	R7:P1	None
Trace 1f2a	Net (J1 - 1)	Q2:S	None
Trace 4b24	Net (J1 - 1)	J1:1	None
Trace 5bea	Net (J1 - 1)	J1:1	None
Trace 7c85	Net (J1 - 1)	J1:1	None
Trace 9a76	Net (J1 - 1)	Q2:S	None
Trace 37aa	Net (J1 - 1)	J1:1	None
Trace 68b6	Net (J1 - 1)	J1:1	None
Trace 90f9	Net (J1 - 1)	J1:1	None
Trace 94cd	Net (J1 - 1)	Q2:S	None
Trace 1177	Net (J1 - 1)	J1:1	None
Trace 1380	Net (J1 - 1)	J1:1	None
Trace 5771	Net (J1 - 1)	Q2:S	None
Trace a2d6	Net (J1 - 1)	J1:1	None
Trace af11	Net (J1 - 1)	J1:1	None
Trace c2d3	Net (J1 - 1)	Q2:S	None
Trace 0d50	Net (J2 - 1)	R7:P2	None
Trace 1b7a	Net (J2 - 1)	IC1:VIN+	None
Trace 2bcd	Net (J2 - 1)	J2:1	None
Trace 2dbe	Net (J2 - 1)	C4:P2	None
Trace 2dbe	Net (J2 - 1)	R7:P2	None
Trace 2f40	Net (J2 - 1)	R7:P2	None
Trace 4b45	Net (J2 - 1)	J2:1	None
Trace 4f62	Net (J2 - 1)	R7:P2	None
Trace 5e3f	Net (J2 - 1)	R7:P2	None
Trace 6bcd	Net (J2 - 1)	R7:P2	None
Trace 6f29	Net (J2 - 1)	R7:P2	None
Trace 7fa8	Net (J2 - 1)	J2:1	None
Trace 8a89	Net (J2 - 1)	R7:P2	None
Trace 12ce	Net (J2 - 1)	C4:P2	None
Trace 026d	Net (J2 - 1)	J2:1	None
Trace 35c9	Net (J2 - 1)	J2:1	None
Trace 54f4	Net (J2 - 1)	R7:P2	None
Trace 79a9	Net (J2 - 1)	J2:1	None
Trace 82de	Net (J2 - 1)	J2:1	None
Trace 90ab	Net (J2 - 1)	R7:P2	None
Trace 393a	Net (J2 - 1)	R7:P2	None
Trace 526e	Net (J2 - 1)	R7:P2	None
Trace 877c	Net (J2 - 1)	R7:P2	None
Trace 1309	Net (J2 - 1)	U2:VI	None
Trace 3808	Net (J2 - 1)	R7:P2	None
Trace 4098	Net (J2 - 1)	R7:P2	None
Trace 5568	Net (J2 - 1)	R7:P2	None
Trace 6756	Net (J2 - 1)	J2:1	None
Trace 7058	Net (J2 - 1)	R7:P2	None
Trace 7477	Net (J2 - 1)	R7:P2	None
Trace 8038	Net (J2 - 1)	R7:P2	None
Trace a2d4	Net (J2 - 1)	R7:P2	None
Trace acb5	Net (J2 - 1)	R7:P2	None
Trace afb4	Net (J2 - 1)	J2:1	None
Trace b803	Net (J2 - 1)	J2:1	None
Trace b978	Net (J2 - 1)	R7:P2	None
Trace bdef	Net (J2 - 1)	J2:1	None
Trace c2b5	Net (J2 - 1)	J2:1	None
Trace c198	Net (J2 - 1)	R7:P2	None
Trace c353	Net (J2 - 1)	R7:P2	None
Trace cfe8	Net (J2 - 1)	J2:1	None
Trace d8dd	Net (J2 - 1)	R7:P2	None
Trace daa9	Net (J2 - 1)	R7:P2	None
Trace 320a	Net (Q1 - C)	Q1:C	None
Trace a566	Net (Q1 - C)	Q2:G	None
Trace 49e5	Net (R2 - P1)	R1:P1	None
Trace 604c	Net (R2 - P2)	SW2:P1	None
Trace b298	Net (R2 - P2)	SW2:P1	None
Trace 0fd2	Net (R4 - P2)	SW4:P1	None
Trace 46e0	Net (R4 - P2)	SW4:P1	None
Trace 01d7	Net (R8 - P1)	R8:P1	None
Trace 08e4	Net (R8 - P1)	R8:P1	None
Trace 49ae	Net (R9 - P1)	OLED1:SDA	None
Trace 8038	Net (R9 - P1)	R9:P1	None
Trace 00e5	Net (R9 - P2)	U2:2-1	None
Trace 2f65	Net (R9 - P2)	C1:P2	None
Trace 4abe	Net (R9 - P2)	C5:P2	None
Trace 30c3	Net (R9 - P2)	OLED1:5V	None
Trace 39d5	Net (R9 - P2)	R9:P2	None
Trace 3073	Net (R9 - P2)	C3:P2	None
Trace 4623	Net (R9 - P2)	C1:P2	None
Trace 4623	Net (R9 - P2)	C2:P2	None
Trace da17	Net (R9 - P2)	C2:P2	None
Trace 38d9	Net (SW1 - P1)	SW1:P1	None
Trace a9d4	Net (SW3 - P1)	SW3:P1	None
Trace 592e	Net (U1 - XTAL2/PB4)	Q1:B	None
C1:P2	None	Trace d5dd	Net (R9 - P2)
C3:P1	None	Trace dfef	GND
C3:P2	None	Trace ec98	Net (R9 - P2)
C4:P2	None	Trace 6bcd	Net (J2 - 1)
C4:P2	None	Trace 8ca7	Net (J2 - 1)
C4:P2	None	Trace 8f4f	Net (J2 - 1)
C4:P2	None	Trace 42df	Net (J2 - 1)
C4:P2	None	Trace 7338	Net (J2 - 1)
C4:P2	None	Trace c4d8	Net (J2 - 1)
C4:P2	None	Trace cfe2	Net (J2 - 1)
C5:P2	None	Trace ffb2	Net (R9 - P2)
IC1:A0	None	Trace d29a	GND
IC1:A0	None	Trace e78e	GND
IC1:A1	None	Trace d29a	GND
IC1:GND	None	Trace b9bc	GND
IC1:SCL	None	Trace a86f	Net (R8 - P1)
IC1:SDA	None	Trace 52b2	Net (R9 - P1)
IC1:VIN-	None	Trace 2b54	Net (IC1 - VIN-)
IC1:VIN-	None	Trace e33e	Net (IC1 - VIN-)
IC1:VIN+	None	Trace c42c	Net (J2 - 1)
IC1:VIN+	None	Trace c92f	Net (J2 - 1)
IC1:VS	None	Trace 830e	Net (R9 - P2)
J2:1	None	Trace ef3c	Net (J2 - 1)
J2:1	None	Trace f12c	Net (J2 - 1)
J2:1	None	Trace f16c	Net (J2 - 1)
J2:1	None	Trace fa0a	Net (J2 - 1)
J2:1	None	Trace ff96	Net (J2 - 1)
OLED1:5V	None	Trace 5cea	Net (R9 - P2)
OLED1:SCL	None	Trace a47b	Net (R8 - P1)
OLED1:SCL	None	Trace b0f8	Net (R8 - P1)
Q1:C	None	Trace 7c68	Net (Q1 - C)
Q1:E	None	Trace 84d2	GND
Q1:E	None	Trace d8d4	GND
R1:P1	None	Trace fd95	Net (R2 - P1)
R1:P2	None	Trace fa3a	Net (SW1 - P1)
R2:P1	None	Trace 7f86	Net (R2 - P1)
R2:P2	None	Trace 604c	Net (R2 - P2)
R3:P1	None	Trace 8324	Net (R2 - P1)
R3:P2	None	Trace ebff	Net (SW3 - P1)
R4:P1	None	Trace 5d92	Net (R2 - P1)
R4:P1	None	Trace 6d91	Net (R2 - P1)
R4:P2	None	Trace 46e0	Net (R4 - P2)
R5:P1	None	Trace afdf	Net (R2 - P1)
R5:P2	None	Trace 7c0c	Net (R9 - P2)
R6:P1	None	Trace 3a3c	Net (SW5 - P1)
R6:P1	None	Trace fc33	Net (SW5 - P1)
R6:P2	None	Trace 90c4	Net (R9 - P2)
R7:P2	None	Trace ef3c	Net (J2 - 1)
R7:P2	None	Trace f71b	Net (J2 - 1)
R7:P2	None	Trace fb9a	Net (J2 - 1)
R8:P1	None	Trace 3050	Net (R8 - P1)
R8:P2	None	Trace 7e2b	Net (R9 - P2)
R8:P2	None	Trace 7fd8	Net (R9 - P2)
R8:P2	None	Trace c65e	Net (R9 - P2)
R9:P2	None	Trace c65e	Net (R9 - P2)
R9:P2	None	Trace da17	Net (R9 - P2)
R10:P1	None	Trace d481	Net (Q1 - C)
R10:P2	None	Trace f972	Net (IC1 - VIN-)
SW1:P1	None	Trace fa3a	Net (SW1 - P1)
SW3:P1	None	Trace ebff	Net (SW3 - P1)
SW4:P2	None	Trace e3c4	GND
SW4:P2	None	Trace ed7c	GND
SW5:P1	None	Trace 4f79	Net (SW5 - P1)
SW5:P2	None	Trace 3c92	GND
U1:～RESET～/PB5	None	Trace bc3c	Net (SW5 - P1)
U1:～RESET～/PB5	None	Trace fc33	Net (SW5 - P1)
U1:AREF/PB0	None	Trace 43e9	Net (R9 - P1)
U1:AREF/PB0	None	Trace 49f3	Net (R9 - P1)
U1:AREF/PB0	None	Trace 7564	Net (R9 - P1)
U1:AREF/PB0	None	Trace bcaf	Net (R9 - P1)
U1:GND	None	Trace eb06	GND
U1:PB2	None	Trace 2b9d	Net (R8 - P1)
U1:PB2	None	Trace 330a	Net (R8 - P1)
U1:PB2	None	Trace 502d	Net (R8 - P1)
U1:VCC	None	Trace 2b43	Net (R9 - P2)
U1:VCC	None	Trace d5dd	Net (R9 - P2)
U1:XTAL1/PB3	None	Trace e9da	Net (R2 - P1)
U1:XTAL2/PB4	None	Trace 8e6f	Net (U1 - XTAL2/PB4)
U2:2-1	None	Trace a47f	Net (R9 - P2)
U2:2-1	None	Trace aeef	Net (R9 - P2)
U2:2-1	None	Trace ffb2	Net (R9 - P2)
U2:GND	None	Trace fb09	GND
U2:VI	None	Trace 5cd9	Net (J2 - 1)
U2:VI	None	Trace 9de5	Net (J2 - 1)
U2:VI	None	Trace 86b3	Net (J2 - 1)
U2:VI	None	Trace 7797	Net (J2 - 1)
U2:VI	None	Trace bee2	Net (J2 - 1)
U2:VI	None	Trace dd4e	Net (J2 - 1)
U2:VO	None	Trace a47f	Net (R9 - P2)

Invalid Layer

Reports nodes that are assigned to a layer that doesn't exist in the layout stackup.

Component Overrides • 19

	Designator	Ruleset
	Model	OLED
		Override rule for
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀VALUE｀＊	Override rule for ＊｀VALUE｀＊
	SW	Override rule for SW
	SW	Override rule for SW
	SW	Override rule for SW
	SW	Override rule for SW
	SW	Override rule for SW

Airwires

Reports missing routed traces between pads in a net.

Deprecated Rules

Reports nodes that are using rules that are not supported anymore.

Layers with Multiple Fills

Reports layers that have multiple copper fills of different nets. Make sure the Connected Layers rule value of nets with fills is valid.

Floating Copper • 5

	Name
	Trace 05c3
	Trace 03bc, Trace cf7a
	Trace 2349, Trace 4c9e, Trace 4e06, Trace c7be, Trace 657e, Trace de0a
	Trace 3c54, Trace b23b, Trace 6d0c, Trace f852, Trace b832
	Trace 6699, Trace a8ba, Trace d308, Trace c599

Protected Intrusions

Reports intrusions from objects of other nets into polygons or fills that have the Protected layout rule applied.

Manufacturing

Manufacturer Part Number • 16

	Designator	MPN
	C1	None
	C2	None
	C3	None
	C4	None
	C5	None
	OLED1	None
	R1	None
	R2	None
	R3	None
	R4	None
	R5	None
	R6	None
	R7	None
	R8	None
	R9	None
	R10	None

Parts Available

Beta

Checks that all parts have a part number and are available from distributors.

System Checks

Auto-Layout

Beta

Reports issues with Auto-Layout if Flux cannot route something or must ignore a configuration.

Passive Components

Resistor Power Rating

Beta

Checks that the power traveling across a given resistor is under its rating with 50% headroom.

Learn more

Pull Up/Pull Down Presence

Beta

Checks that IC pins that require pull up or pull down resistors have them.

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Capacitor Voltage Rating

Beta

Checks that capacitors have appropriate voltage ratings to prevent overheating and ensure reliable circuit operation.

Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Net Portal
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
jharwinbarrozo
43.0M
Power Net Portal
Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
jharwinbarrozo
11.4M
Generic Resistor
A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Capacitor
A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Inductor
A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #generics
jharwinbarrozo
15.1k
Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
RMCF0805JT47K0
47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
jharwinbarrozo
1.2M
875105359001
10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
jharwinbarrozo
1.2M
CTL1206FYW1T
Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
jharwinbarrozo
1.1M

Inspect

ATtiny85 Phone Charge Guard

Controls

Properties

Availability & Pricing

Distributor		Qty 1
	Digi-Key	$6.48–$9.25
	LCSC	$9.20–$9.22
	Mouser	$9.02

Assets

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