Schematic for Biskuit AI 6254: 1. Overview: The Biskuit pendant...

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Explain this project in detail. Describe its purpose, core components, and how they interact. Break down the design, implementation, and functionality step by step. Highlight key technologies, dependencies, and design choices, including trade-offs and optimizations. Discuss potential challenges, performance considerations, and real-world applications. If applicable, suggest areas for improvement, scalability, and future enhancements.

213 days

flux

is thinking...

213d 14:36:15

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213 days

Ready.

USB_D-

PWR_SDA

PWR_SCL

VDD_SPI

C39

Capacitance

0.1u F

C37

Capacitance

TBD F

USB_D+

SPI_HOLD

C40

Capacitance

0.1u F

BIAS_MIC3

BIAS_MIC1

C31

Capacitance

1u F

ADC_SDA

SPI_HOLD

ADC_I2S_CLK

ADC_I2S_FSYNC(WS)

ADC_GPIO1

VDD3V3

C30

Capacitance

0.1u F

SPI_WP

BIAS_MIC4

ADC_SCL

VDD3V3

SPI_WP

ADC_I2S_SD

ADC_SHDNZ

C36

Capacitance

TBD F

C33

Capacitance

0.1u F

C35

Capacitance

10p F

BIAS_MIC2

R21

Resistance

2.2k Ω

MTMS

MTCK

Inductance

TBD H

MTDO

MTDI

R20

Resistance

2.2k Ω

R13

Resistance

240 Ω

R14

Resistance

240 Ω

AN1

SW3

R12

Resistance

5.1k Ω

R18

Resistance

22 Ω

Reviews

Electrical Rule Checks

Missing Footprints

Reports parts that have no footprint.

Design Rule Checks

Overlapping Copper • 3

Des	Net	Des	Net
AN1:1	Net 39	AN1:GND	None
AN1:FeedPoint	None	AN1:1	Net 39
AN1:GND	None	AN1:2	GND

Invalid Layer

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

Component Overrides • 16

	Designator	Ruleset
	＊｀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｀＊
	IC＊＊	Override rule for IC＊＊
	Silk Shapes	Override rule for Silk Shapes
	Silk Shapes	Override rule for Silk Shapes
	Silk Shapes	Override rule for Silk Shapes
	Silk Shapes	Override rule for Silk Shapes
	Silk Shapes	Override rule for Silk Shapes
	Silk Shapes	Override rule for Silk Shapes
	Silk Shapes	Override rule for Silk Shapes
	Y＊＊	Override rule for Y＊＊

Airwires • 185

	Designators	Net
	U4:GPIO4, U1:GPIO1	ADC_GPIO1
	U4:GPIO2, U1:BCLK	ADC_I2S_CLK
	U4:GPIO3, U1:SDOUT	ADC_I2S_SD
	U4:GPIO1, U1:FSYNC	ADC_I2S_WS
	U4:GPIO5, U1:SHDNZ	ADC_SHDNZ
	C12:P1, C13:P1	AREG
	C12:P1, U1:AREG	AREG
	R6:P1, MK1:VDD	BIAS_MIC1
	TP-1:TP, MK1:VDD	BIAS_MIC1
	R8:P1, MK2:VDD	BIAS_MIC2
	R8:P1, TP-4:TP	BIAS_MIC2
	MK3:VDD, R9:P1	BIAS_MIC3
	TP-7:TP, R9:P1	BIAS_MIC3
	MK4:VDD, R7:P1	BIAS_MIC4
	MK4:VDD, TP-10:TP	BIAS_MIC4
	C9:P1, C10:P1	DREG
	U1:DREG, C10:P1	DREG
	C9:P2, C10:P2	GND
	C9:P2, C19:P2	GND
	C10:P2, C27:P2	GND
	C11:P2, C17:P2	GND
	C11:P2, U1:AVSS	GND
	C12:P2, C13:P2	GND
	C12:P2, C19:P2	GND
	C13:P2, C11:P2	GND
	C14:P2, C15:P2	GND
	C14:P2, C22:P2	GND
	C14:P2, SW1:1	GND
	C16:P2, C18:P2	GND
	C16:P2, C27:P2	GND
	C20:P2, C19:P2	GND
	C20:P2, SW3:4	GND
	C22:P2, C21:P2	GND
	C24:P2, C25:P2	GND
	C24:P2, C35:P2	GND
	C24:P2, Y1:GND_1	GND
	C25:P2, C36:P2	GND
	C26:P2, C36:P2	GND
	C28:P2, C29:P2	GND
	C28:P2, C37:P2	GND
	C29:P2, C27:P2	GND
	C31:P2, C30:P2	GND
	C32:P2, C22:P2	GND
	C34:P2, C32:P2	GND
	C34:P2, Y1:GND_2	GND
	C37:P2, AN1:2	GND
	C37:P2, C36:P2	GND
	C39:P2, C29:P2	GND
	C40:P2, C30:P2	GND
	C40:P2, R5:P2	GND
	C40:P2, U5:GND	GND
	J1:GND, R5:P2	GND
	J2:PIN1, MK4:GND__1	GND
	J2:PIN1, R11:P2	GND
	MK1:GND, MK1:GND__1	GND
	MK2:GND__1, MK3:GND	GND
	MK2:GND, MK1:GND__1	GND
	MK2:GND, MK2:GND__1	GND
	MK3:GND, MK3:GND__1	GND
	MK4:GND, MK3:GND__1	GND
	MK4:GND, MK4:GND__1	GND
	Q1:E, C17:P2	GND
	Q1:E, TP-14:TP	GND
	Q3:S, C33:P2	GND
	R4:P2, C23:P2	GND
	R4:P2, U2:GND	GND
	R5:P2, C23:P2	GND
	R11:P2, C30:P2	GND
	R11:P2, J1:GND	GND
	R14:P2, C18:P2	GND
	R14:P2, C33:P2	GND
	SW1:1, SW1:2	GND
	SW3:3, SW3:4	GND
	U1:AVSS, U1:VSS	GND
	U4:GND, C21:P2	GND
	U5:GND, C21:P2	GND
	Y1:GND_1, Y1:GND_2	GND
	Q1:B, C17:P1	MICBIAS
	R6:P2, C17:P1	MICBIAS
	R7:P2, R9:P2	MICBIAS
	R8:P2, R6:P2	MICBIAS
	R8:P2, R9:P2	MICBIAS
	U1:MICBIAS, C17:P1	MICBIAS
	C3:P1, MK2:OUTPUT-	Net 3
	TP-6:TP, MK2:OUTPUT-	Net 3
	C1:P1, MK1:OUTPUT+	Net 4
	TP-2:TP, MK1:OUTPUT+	Net 4
	C4:P1, MK2:OUTPUT+	Net 5
	C4:P1, TP-5:TP	Net 5
	C2:P1, MK1:OUTPUT-	Net 9
	TP-3:TP, MK1:OUTPUT-	Net 9
	C5:P1, MK3:OUTPUT-	Net 13
	TP-9:TP, MK3:OUTPUT-	Net 13
	C6:P1, MK3:OUTPUT+	Net 14
	C6:P1, TP-8:TP	Net 14
	BLUE:K, R1:P1	Net 15
	MK4:OUTPUT+, C8:P1	Net 19
	TP-11:TP, C8:P1	Net 19
	MK4:OUTPUT-, C7:P1	Net 20
	TP-12:TP, MK4:OUTPUT-	Net 20
	Q1:C, R1:P2	Net 25
	C34:P1, Y1:HOT_2	Net 29
	U4:XTAL_N, Y1:HOT_2	Net 29
	C35:P1, Y1:HOT_1	Net 35
	R18:P1, C35:P1	Net 35
	SW1:3, SW1:4	Net 36
	U2:/MR, SW1:3	Net 36
	U4:XTAL_P, R18:P2	Net 37
	L2:P1, C36:P1	Net 38
	U4:LNA_IN, C36:P1	Net 38
	C37:P1, AN1:1	Net 39
	C37:P1, L2:P2	Net 39
	R21:P2, U4:GPIO36	Net 40
	U2:SCL, U4:GPIO36	Net 40
	R20:P2, U4:GPIO37	Net 41
	U2:SDA, U4:GPIO37	Net 41
	MTDO:TP, U4:MTDO	Net 42
	MTDI:TP, U4:MTDI	Net 43
	MTMS:TP, U4:MTMS	Net 44
	MTCK:TP, U4:MTCK	Net 45
	C39:P1, SW3:2	Net 46
	C39:P1, U4:CHIP_PU	Net 46
	SW3:1, R12:P2	Net 46
	SW3:1, SW3:2	Net 46
	R13:P2, U4:GPIO13	Net 47
	R13:P1, Q3:G	Net 48
	R13:P1, R14:P1	Net 48
	R17:P1, LED1:B	Net 49
	Q3:D, R15:P2	Net 50
	Q3:D, R16:P2	Net 50
	R17:P2, R16:P2	Net 50
	R16:P1, LED1:G	Net 51
	LED1:R, R15:P1	Net 52
	U1:SCL_MOSI, R3:P2	SCL
	U4:GPIO8, R3:P2	SCL
	R2:P2, U1:SDA_SSZ	SDA
	R2:P2, U4:GPIO7	SDA
	U5:SCK, U4:SPICLK	SPI_CLK
	U5:～CS, U4:SPICS0	SPI_CS
	U5:SO(I/O1), U4:SPID	SPI_DI
	U5:SI(I/O0), U4:SPIQ	SPI_DO
	U5:～HOLD, U4:SPIHD	SPI_HOLD
	U5:～WP, U4:SPIWP	SPI_WP
	R4:P1, U2:TS	TS
	J1:DN1, J1:DN2	USB_D-
	U4:GPIO19/USB_D-, J1:DN1	USB_D-
	J1:DP2, J1:DP1	USB_D+
	U4:GPIO20/USB_D+, J1:DP1	USB_D+
	U2:BAT_1, C23:P1	VBAT
	U2:BAT_2, U2:BAT_1	VBAT
	U2:VDD, C22:P1	VDD
	BLUE:A, C20:P1	VDD3V3
	BLUE:A, TP-13:TP	VDD3V3
	C16:P1, C18:P1	VDD3V3
	C16:P1, U1:IOVDD	VDD3V3
	C20:P1, C19:P1	VDD3V3
	C28:P1, R12:P1	VDD3V3
	C28:P1, Trace 837e:Trace 837e	VDD3V3
	C33:P1, LED1:A	VDD3V3
	R2:P1, C18:P1	VDD3V3
	R2:P1, R3:P1	VDD3V3
	R2:P1, U4:VDD3P3_RTC	VDD3V3
	R21:P1, R20:P1	VDD3V3
	R21:P1, Trace 156a:Trace 156a	VDD3V3
	Trace 68bd:Trace 68bd, Trace 6c79:Trace 6c79	VDD3V3
	Trace 68bd:Trace 68bd, Trace 43a8:Trace 43a8	VDD3V3
	Trace f897:Trace f897, C16:P1	VDD3V3
	U1:AVDD, C19:P1	VDD3V3
	U1:IOVDD, U1:AVDD	VDD3V3
	U2:LS/LDO, C21:P1	VDD3V3
	U2:LS/LDO, R20:P1	VDD3V3
	C40:P1, U5:VCC	VDD_SPI
	U5:VCC, C30:P1	VDD_SPI
	C2:P2, U1:IN1M_GPO1	VIN1M
	C1:P2, U1:IN1P_GPI1	VIN1P
	C3:P2, U1:IN2M_GPO2	VIN2M
	C4:P2, U1:IN2P_GPI2	VIN2P
	C5:P2, U1:IN3M_GPO3	VIN3M
	C7:P2, U1:IN4M_GPO4	VIN3M
	C6:P2, U1:IN3P_GPI3	VIN3P
	U1:IN4P_GPI4, C8:P2	VIN4P
	U2:PMID_1, C15:P1	VPMID
	U2:PMID_1, U2:PMID_2	VPMID
	U2:VINLS, uVia 1:2 - 1:uVia 1:2 - 1	VPMID
	U2:IN, Trace f5f9:Trace f5f9	VUSB

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 • 3

	Name
	Copper Fill Island, Buried 2:3 - 1
	uVia 1:2 - 1
	Copper Fill Island

Protected Intrusions

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

Manufacturing

Manufacturer Part Number • 46

	Designator	MPN
	AN1	None
	C9	None
	C10	None
	C11	None
	C12	None
	C13	None
	C14	None
	C15	None
	C21	None
	C22	None
	C23	None
	C24	None
	C25	None
	C26	None
	C27	None
	C28	None
	C29	None
	C30	None
	C31	None
	C32	None
	C33	None
	C34	None
	C35	None
	C36	None
	C37	None
	C39	None
	C40	None
	L1	None
	L2	None
	R2	None
	R3	None
	R4	None
	R5	None
	R10	None
	R11	None
	R12	None
	R13	None
	R14	None
	R15	None
	R16	None
	R17	None
	R18	None
	R19	None
	R20	None
	R21	None
	U2	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

Biskuit AI 6254

Controls

Properties

Domain

Consumer Electronics

Compliance

RoHS, REACH

Operating Voltage

1.8

Operating Temperature

-20 to 50

Reliability Target (MTBF)

10000 hours

Power Requirements

Battery

Connectivity

WiFi, Bluetooth

Human Interface

Button, Display

License

https://ohwr.org/project/cernohl/wikis/home

Battery Lifetime

150hrs

Construction

Aluminum body

IP Rating

IP68

Device Input

Microphone Array

Software compatibility

IOS, WINDOWS, ANDROID

Description

The Biskuit pendant is a wearable AI transcription assistant. An innovative device designed to seamlessly integrate into daily activities, providing real-time transcription and note-taking capabilities. Combining advanced AI algorithms with state-of-the-art hardware components, the device offers crystal clear audio recording, durable construction, and convenient features such as cloud synchronization, weatherproofing, and a vibrant display for animations and expressions.

Microphone TI Ref Design

https://drive.google.com/file/d/195FT2PQD5LBLPHQvMQ77EjG55xSXPbak/view?usp=sharing

Battery Option

https://www.lipobattery.us/iec62133-certified-lipo-battery-lp453038-500mah-3-7v-1-85wh-with-pcm-wires-molex-51021-0200/?_gl=1*1lilgtd*_up*MQ..*_ga*NTc1Nzg4MTczLjE3MjM4MjAyOTM.*_ga_08ZLJYQED8*MTcyMzgyMDI4OS4xLjEuMTcyMzgyMDMzNi4wLjAuMTQ2MjQwNTIxMg..

Availability & Pricing

Distributor		Qty 1
	Arrow	$3.56–$4.69
	Digi-Key	$9.90–$10.46
	LCSC	$10.00–$18.99
	Mouser	$18.47
	Verical	$0.90–$5.18

Assets

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