Schematic for MAX31865 Temperature Sensor Template: High-Frequency...

Voltage Regulator Schematic Design

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Work done

None of the footprint or DRC rules have been configured yet; component placement and routing have not started.

Remaining tasks

Footprint & Rule Configuration
- Verify footprints of Q1–Q4, U3, U7, U8, T1, L1, C11, etc., match the 4-layer stackup.
- Apply high-voltage clearances (5 mm) and creepage (8 mm) to HV nets, and logic clearances (1 mm) and creepage (2 mm) to low-voltage nets.
- Define isolation keepouts and assign dedicated layers for the LM331/TL431 control nets and ADUM1201 interface.
Component Placement
- Cluster Q1–Q4 with L1/C11.
- Place T1, C9, C10 near the HV bus.
- Enforce isolation gap for U5 (ADUM1201), U4, U7, U8.
- Position decoupling/snubber caps (100 nF, 1 µF, 10 µF) close to their devices.
Routing Strategy
- Route HF loops (Q1–Q4, L1, C11) with wide, short traces.
- Keep L1–C11 loop intact on uninterrupted copper.
- Route LM331/TL431 nets on quieter layers with dedicated returns.
- Create an isolated path for the ADUM1201 interrupter signal.
Design Review & DRC
- Run Flux DRC to confirm clearances, creepage, spacing.
- Verify test points and labeling.
Manufacturability Review
- Validate spacing for CNC tolerances.
- Document special instructions for HV isolation and test points.

Success criteria review

None of the targets (minimized HF loops, HV barrier, resonant-tank integrity, LF-path isolation, DRC pass) have been met yet.

Recommended next step Begin with Footprint & Rule Configuration:

Open the PCB rules editor and set up the HV and LV clearances/creepage rules.
Audit key footprints to ensure layer assignments and pin mapping are correct.

35 days

Needs more info.

Show Plan

Resistance

10k Ω

SDI_5V

Manufacturer Part Number

MIC5225-3.3YM5-TR

DRDY

VDD

Capacitance

10u F

SDO

DRDY

R7 P2 - D4 cathode

Inductance

SDO

Capacitance

10u F

Resistance

10k Ω

Resistance

400 Ω

Tolerance

1 %

L1 P2 - T1 PRI_1+_9-75_V_200_KHZ

FB1

VDD

VIN

Capacitance

0.1u F

Capacitance

0.1u F

D4 anode - R9 P1

VIN

VDD

CS_5V

Inductance

VDD

SCLK_5V

Capacitance

0.1u F

Resistance

10k Ω

FB2

SCLK_5V

SDI_5V

CS_5V

R6 P2 - GND

J2 1 - C10 P1

Reviews

Electrical Rule Checks

Missing Footprints

Reports parts that have no footprint.

Design Rule Checks

Overlapping Copper • 34

Des	Net	Des	Net
D4:anode	envelope_sense_net	Trace 74e4	Net 8
D4:anode	envelope_sense_net	Trace 6304	Net 8
D4:anode	envelope_sense_net	Trace c33b	Net 8
D4:anode	envelope_sense_net	Trace 94d5	Net 9
J4:PIN_2	envelope_sense_net	C10:P2	GND
C2:P2	GND	D4:anode	envelope_sense_net
R5:P2	GND	Q4:D	Net 8
Through-hole - 1	GND	Q4:S	None
Trace 04ef	GND	Q4:S	None
Trace 7bf0	GND	Q4:S	None
Trace b167	GND	Q4:S	None
U1:GND	GND	Q4:S	None
U2:GND	GND	D4:anode	envelope_sense_net
Trace 2d3e	Net 4	Q4:S	None
Trace bd2b	Net 4	R5:P2	GND
Trace bd2b	Net 4	Q4:D	Net 8
Trace bd2b	Net 4	Q4:G	Net 10
X2:P2	Net 4	Q4:G	Net 10
Trace 0b73	Net 5	Q4:S	None
Trace 6c0e	Net 5	Q4:S	None
Trace a374	Net 5	Q4:S	None
U1:FORCE-	Net 5	Q4:S	None
C2:P1	Net 8	D4:anode	envelope_sense_net
Trace 32b8	Net 8	D4:anode	envelope_sense_net
U2:IN	Net 8	D4:anode	envelope_sense_net
T1:PRI_1+_9-75_V_200_KHZ	resonant_tank_loop_p2	U5:VOB	envelope_sense_net
T1:SEC_1+_3.3_V_5_A	SEC_SENSE	U6:PAD	None
U5:VIA	vco_output_net	U7:+IN	None
T1:NC_1	None	U5:VIA	vco_output_net
TP3:1	None	X1:P2	Net 3
TP3:2	None	Trace 2c0a	Net 3
TP3:2	None	X1:P2	Net 3
U5:VDD2	None	U7:OUT	vco_output_net
U6:GND	None	C9:P2	GND

Invalid Layer

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

Component Overrides • 13

	Designator	Ruleset
	Fab Shapes	Override rule for Fab Shapes
	Fab Shapes	Override rule for Fab Shapes
	Fab Shapes	Override rule for Fab Shapes
	Fab Shapes	Override rule for Fab Shapes
	Model	Override rule for Model
	＊｀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｀＊
	Silk Shapes	Override rule for Silk Shapes

Airwires • 45

	Designators	Net
	R7:P2, D4:cathode	DIVIDER_OUTPUT
	D4:anode, C12:P1	envelope_sense_net
	J3:2, U4:PA0	envelope_sense_net
	J3:2, U8:REF	envelope_sense_net
	J4:PIN_2, J4:PIN_3	envelope_sense_net
	J4:PIN_2, U4:PA1	envelope_sense_net
	J4:PIN_4, J4:PIN_3	envelope_sense_net
	R9:P1, C12:P1	envelope_sense_net
	U4:PA1, U4:PA0	envelope_sense_net
	U5:VIB, R9:P1	envelope_sense_net
	U5:VIB, U5:VOB	envelope_sense_net
	U5:VOB, J4:PIN_4	envelope_sense_net
	C9:P2, Via-9-13:Via-9-13	GND
	C10:P2, C10:P2	GND
	J1:Pin_2, R6:P2	GND
	U2:GND, C2:P2	GND
	Via-1-13:Via-1-13, J2:2	GND
	Via-12-10:Via-12-10, C10:P2	GND
	Q1:G, Q2:G	Net 2
	Q1:G, U3:OUTA	Net 2
	C9:P1, Q4:D	Net 8
	C10:P1, C9:P1	Net 8
	C10:P1, Q2:D	Net 8
	C11:P1, C9:P1	Net 8
	L1:P1, J2:1	Net 8
	L1:P1, R5:P1	Net 8
	Q1:D, C10:P1	Net 8
	Q3:D, Q1:D	Net 8
	R5:P1, Q4:D	Net 8
	Trace 74e4:Trace 74e4, R6:P1	Net 8
	Trace 99bf:Trace 99bf, L1:P1	Net 8
	Trace 8325:Trace 8325, Trace 94d5:Trace 94d5	Net 9
	Q3:G, Q4:G	Net 10
	U3:OUTB, Q4:G	Net 10
	C11:P2, L1:P2	resonant_tank_loop_p2
	T1:PRI_1+_9-75_V_200_KHZ, T1:PRI_1-_9-75_V_200_KHZ	resonant_tank_loop_p2
	T1:PRI_1-_9-75_V_200_KHZ, L1:P2	resonant_tank_loop_p2
	R7:P1, R8:P1	SEC_SENSE
	T1:SEC_1+_3.3_V_5_A, R8:P1	SEC_SENSE
	R11:P1, U7:V-	slow_ctrl_net
	U7:V-, U8:K	slow_ctrl_net
	J4:PIN_1, J3:1	vco_output_net
	U5:VIA, J4:PIN_1	vco_output_net
	U7:OUT, U5:VOA	vco_output_net
	Fill:Fill, R5:P2	None

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

Detect any via, trace or copper fill island that is not connected to any net.

Protected Intrusions

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

Manufacturing

Manufacturer Part Number • 37

	Designator	MPN
	C1	None
	C2	None
	C3	None
	C5	None
	C6	None
	C7	None
	C8	None
	C9	None
	C10	None
	C11	None
	C12	None
	C13	None
	C14	None
	C15	None
	C16	None
	C17	None
	FB1	None
	FB2	None
	J1	None
	J4	None
	J5	None
	L1	None
	L2	None
	R1	None
	R2	None
	R3	None
	R4	None
	R5	None
	R6	None
	R7	None
	R8	None
	R9	None
	R10	None
	R11	None
	R12	None
	X1	None
	X2	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.

Learn more

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

MAX31865 Temperature Sensor Template

Controls

Properties

License

https://creativecommons.org/licenses/by/4.0/

RuleClass_Logic_Clearance Creepage

2 mm

RuleClass_HV_Clearance Creepage

8 mm

System Architecture

```mermaid flowchart LR DC[DC Bus Input (330–385V)] --> Pre[Precharge / Bleeder] Pre --> FB[Full-Bridge Stage] FB --> Tank[Resonant Tank (L1 + 60 nF)] Tank --> XFMR[Transformer Primary] XFMR --> CTRL[Control / Driver] XFMR --> FBK[Feedback / Isolation] FBK --> CTRL CTRL --> FB ```

RuleClass_Logic_Clearance

1mm

RuleClass_Logic_Creepage

2mm

RuleClass_HV_Clearance

5mm

RuleClass_HV_Creepage

8mm

RuleClass_Logic_Clearance Clearance

1 mm

Stackup

Standard 4 Layer

System Architecture

```mermaid flowchart LR DC[DC Bus Input\n330–385V] --> Pre[Precharge / Bleeder] Pre --> FB[Full-Bridge Stage\n(200 kHz PWM)] FB --> Tank[Resonant Tank\n(L1 + 60 nF)] Tank --> XFMR[Transformer Primary] XFMR --> SEC[Transformer Secondary\nHF AC] SEC --> Sense[HV Divider & Rectifier & Envelope] Sense --> TL[TL431 Reference\nSetpoint] TL -->|Inverted Control| VCO[LM331 VCO\n200–2500 Hz] VCO --> U5A[U5 Isolation Channel A] U5A --> CTRL[Control / Driver] Sense --> U5B[U5 Isolation Channel B\nOVP Comparator] U5B --> OVP[OVP Fault] CTRL -.-> FB ```

RuleClass_HV_Clearance Clearance

5 mm

Availability & Pricing

Distributor		Qty 1
	Arrow	$109.37–$142.43
	Digi-Key	$213.71–$215.25
	LCSC	$118.50–$118.52
	Mouser	$233.62
	TME	$8.52
	Verical	$114.72–$202.85

Assets

Thumbnail

MAX31865 Temperature Sensor Template image.png

id=MAX31865 Temperature Sensor Template image

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