# Wearable Ultrasound Collar ## Description Dual-mode wearable ultrasound collar schematic with A-mode sensing, LIPUS therapy, 3 MHz piezo transducer, power management, control, receive chain, ADC, and safety interlocks. ## Project Details - **Owner:** abhimaaan - **Created:** 4/14/2026 - **Last Updated:** 4/14/2026 - **Visibility:** Public - **Operating Voltage:** Single-cell Li-ion with USB-C 5V input - **Implementation Details:** Dual-mode wearable ultrasound collar with A-mode sensing and LIPUS therapy using a single-element 3 MHz 10 mm transducer and MCU-controlled transmit/receive interlock - **Connectivity:** USB-C power, I2C control, SWD debug - **Domain:** Wearable Ultrasound ## Key Components ### D14 — [CDSU101A-HF](https://www.flux.ai/lcsc/cdsu101a-hf~9p7.md) - Role: Clamp or detector diode - Manufacturer Part Number: CDSU101A-HF - Package or Case Code: SOD-523F_L1.7-W0.9-LS1.7-RD - Part Type: Switching Diode - Manufacturer Name: Comchip(典琦) - LCSC Part Number: C2886039 - Role Details: Used for low-capacitance receive clamp protection and envelope detector rectification - Package: SOD-523 - JLCPCB Part Class: Extended Part **Pins:** - A [pin 2] - K [pin 1] ### D15 — [CDSU101A-HF](https://www.flux.ai/lcsc/cdsu101a-hf~9p7.md) - Package or Case Code: SOD-523F_L1.7-W0.9-LS1.7-RD - Part Type: Switching Diode - Manufacturer Name: Comchip(典琦) - Role: Clamp or detector diode - LCSC Part Number: C2886039 - Manufacturer Part Number: CDSU101A-HF - Package: SOD-523 - JLCPCB Part Class: Extended Part - Role Details: Used for low-capacitance receive clamp protection and envelope detector rectification **Pins:** - A [pin 2] - K [pin 1] ### D16 — [CDSU101A-HF](https://www.flux.ai/lcsc/cdsu101a-hf~9p7.md) - Package or Case Code: SOD-523F_L1.7-W0.9-LS1.7-RD - Manufacturer Name: Comchip(典琦) - Part Type: Switching Diode - LCSC Part Number: C2886039 - Role Details: Used for low-capacitance receive clamp protection and envelope detector rectification - Manufacturer Part Number: CDSU101A-HF - Role: Clamp or detector diode - JLCPCB Part Class: Extended Part - Package: SOD-523 **Pins:** - A [pin 2] - K [pin 1] ### D17 — [CDSU101A-HF](https://www.flux.ai/lcsc/cdsu101a-hf~9p7.md) - Role Details: Used for low-capacitance receive clamp protection and envelope detector rectification - Package: SOD-523 - Part Type: Switching Diode - Package or Case Code: SOD-523F_L1.7-W0.9-LS1.7-RD - Manufacturer Name: Comchip(典琦) - LCSC Part Number: C2886039 - Manufacturer Part Number: CDSU101A-HF - JLCPCB Part Class: Extended Part - Role: Clamp or detector diode **Pins:** - A [pin 2] - K [pin 1] ### IC1 — [BQ27427YZFR](https://www.flux.ai/adrian95/bq27427yzfr~cy.md) - Package: DSBGA-9 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Manufacturer Part Number: BQ27427YZFR - Manufacturer Name: Texas Instruments Inc. - Role: Battery fuel gauge - Datasheet URL: https://www.ti.com/lit/ds/symlink/bq27427.pdf - Role Details: Reports battery state to the MCU for therapy lockout and low-battery protection **Pins:** - BAT [pin C3] - BIN [pin B1] - GPOUT [pin A1] - SCL [pin A3] - SDA [pin A2] - SRX [pin C2] - VDD [pin B3] - VSS_1 [pin B2] - VSS_2 [pin C1] ### IC2 — [LT8330IS6#TRMPBF](https://www.flux.ai/adrian95/lt8330is6trmpbf~4a7.md) - License: https://creativecommons.org/licenses/by/4.0/ - Package: SOT-23-6 - Package or Case Code: SOT95P280X100-6N - Role Details: Generates the -15 V analog rail from the positive system supply for the receive front end and ADC driver - Manufacturer Part Number: LT8330IS6#TRMPBF - Manufacturer Name: Analog Devices - Datasheet URL: https://www.analog.com/media/en/technical-documentation/data-sheets/LT8330.pdf - Part Type: Integrated Circuit - Role: Negative rail inverter **Pins:** - EN/UVLO [pin 4] - FBX [pin 3] - GND [pin 2] - INTVCC [pin 5] - SW [pin 1] - VIN [pin 6] ### J1 — [USB4135-GF-A_REVA](https://www.flux.ai/cherepanyadima/usb4135-gf-areva~v9.md) - Symbol Style: Parametric - Manufacturer Part Number: USB4135-GF-A - Role: USB-C power input - Part Type: Connectors - Mount: Surface Mount - Datasheet URL: https://gct.co/files/specs/usb4135-spec.pdf - Role Details: Provides 5 V VBUS input; CC1 and CC2 use 5.1k pull-downs for sink-only operation - Manufacturer Name: GCT - Package: USB-C SMT **Pins:** - CC1 [pin A5] - CC2 [pin B5] - GND_A [pin A12] - GND_B [pin B12] - SHIELD [pin S4] - SHIELD [pin S2] - SHIELD [pin S1] - SHIELD [pin S3] - VBUS_A [pin A9] - VBUS_B [pin B9] ### J2 — [3220-10-0300-00](https://www.flux.ai/adrian95/3220-10-0300-00~4yk.md) - Manufacturer Name: CNC Tech - Package or Case Code: CNC_3220-10-0300-00 - Manufacturer Part Number: 3220-10-0300-00 - Role Details: Provides SWDIO, SWCLK, reset, SWO, ground, and VTref access for firmware development - Package: 2x5 1.27mm - Role: SWD debug header - Datasheet URL: https://www.cnctech.us/pdfs/3220-XX-0300-00_.pdf - Part Type: Connector **Pins:** - 1 [pin 1] - 10 [pin 10] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] ### J3 — [3220-10-0300-00](https://www.flux.ai/adrian95/3220-10-0300-00~4yk.md) - Role: Pulser and T/R switch placeholder - Datasheet URL: https://www.cnctech.us/pdfs/3220-XX-0300-00_.pdf - Package: 2x5 1.27mm - Role Details: Placeholder interface block for HV pulser logic, HV output, receive path, and enable control until an exact pulser/T-R IC is available - Part Type: Connector - Manufacturer Name: CNC Tech - Package or Case Code: CNC_3220-10-0300-00 - Manufacturer Part Number: 3220-10-0300-00 **Pins:** - 1 [pin 1] - 10 [pin 10] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] ### J4 — [Type-C-2.0-6Pin](https://www.flux.ai/jharwinbarrozo/type-c-2p0-6pin~wh.md) - Manufacturer Part Number: Type-C-2.0-6Pin - Part Type: Connector - Role: 3 MHz 10 mm transducer placeholder - Manufacturer Name: CIKI - Package: 2-pin plus mechanical - Role Details: Placeholder for the single-element piezo transducer connection. Intended transducer is approximately 3 MHz, 10 mm element, about 1300 pF class based on sourced reference datasheet - Datasheet URL: https://datasheet.lcsc.com/lcsc/2204071830_CIKI-Type-C-2-0-6Pin_C2987385.pdf **Pins:** - CC1 - CC2 - GND - GND__1 - SHIELD - SHIELD__1 - SHIELD__2 - SHIELD__3 - V-BUS - V-BUS__1 ### LED1 — [HSMD-C190](https://www.flux.ai/adrian95/hsmd-c190~wuc.md) - Manufacturer Part Number: HSMD-C190 - Role: Status LED - Manufacturer Name: Broadcom Limited - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://docs.broadcom.com/docs/AV02-0551EN - Part Type: LED - Package: 0603 - Role Details: Visual indicator for status and fault signaling **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [HSMD-C190](https://www.flux.ai/adrian95/hsmd-c190~wuc.md) - Manufacturer Name: Broadcom Limited - Manufacturer Part Number: HSMD-C190 - Part Type: LED - Datasheet URL: https://docs.broadcom.com/docs/AV02-0551EN - License: https://creativecommons.org/licenses/by/4.0/ - Package: 0603 - Role Details: Visual indicator for status and fault signaling - Role: Status LED **Pins:** - A [pin 2] - K [pin 1] ### LS1 — [CMI-9653S-SMT-TR](https://www.flux.ai/adrian95/cmi-9653s-smt-tr~7o.md) - Package or Case Code: CMI9653SSMTTR - Manufacturer Name: Same Sky - License: https://creativecommons.org/licenses/by/4.0/ - Role: Audible alert - Manufacturer Part Number: CMI-9653S-SMT-TR - Part Type: Buzzer - Role Details: Audible buzzer used for fault indication and user alert - Package: SMD - Datasheet URL: https://componentsearchengine.com/Datasheets/1/CMI-9653S-SMT-TR.pdf **Pins:** - - [pin 1] - + [pin 2] ### Q1 — [DMG9926UDM](https://www.flux.ai/kicad-part-library/dmg9926udm~4q.md) - Datasheet URL: https://www.diodes.com/assets/Datasheets/ds31770.pdf - Package or Case Code: SOT-23-6 - Role Details: Fast dual MOSFET used in the transmit pulser switching path and T/R helper stage - Role: Pulser switch MOSFET - Package: SOT-23-6 - Manufacturer Part Number: DMG9926UDM **Pins:** - D1 [pin 1] - G1 [pin 6] - G2 [pin 4] - S1/D2 [pin 2] - S1/D2 [pin 5] - S2 [pin 3] ### Q2 — [2N7002K](https://www.flux.ai/jecstronic/2n7002k~8y.md) - Datasheet URL: https://www.infineon.com/dgdl/Infineon-2N7002-DS-v02_04-en.pdf - Manufacturer Name: MDD - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor - Manufacturer Part Number: 2N7002K - Role: Buzzer driver - Package: SOT-23 - Role Details: Low-side MOSFET driver for the audible alert buzzer **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### RT1 — [NTCS0805E3103FMT](https://www.flux.ai/adrian95/ntcs0805e3103fmt~zas.md) - Part Type: Thermistor - Manufacturer Name: Vishay Beyschlag/Draloric/BC Components - Role: Temperature sensor - Role Details: Monitors treatment temperature for thermal interlock - Datasheet URL: https://www.vishay.com/docs/29044/ntcs0805e3t.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: NTCS0805E3103FMT - Package: 0805 **Pins:** - 1 [pin 1] - 2 [pin 2] ### U1 — [MP2662](https://www.flux.ai/monolithicpower/mp2662~k9.md) - Manufacturer Part Number: MP2662 - Package or Case Code: WLCSP-9_1p75MMx1p75MM_MP2662_MNP - Datasheet URL: https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP2662 - Role Details: Provides IN, SYS, BATT, I2C status, and NTC monitoring for the wearable ultrasound power subsystem - Package: WLCSP - Product Image Url: https://www.monolithicpower.com/pub/media/catalog/product/m/p/mp2662.jpg - Manufacturer Name: Monolithic Power Systems - Role: Battery charger and power path - Product Info Url: https://www.monolithicpower.com/en/catalog/product/view/id/3082?utm_source=ultralibrarian&utm_medium=component_search&utm_campaign=listing **Pins:** - BATT [pin A3] - GND [pin C3] - IN [pin A1] - INT [pin B2] - NTC [pin B1] - SCL [pin C2] - SDA [pin C1] - SYS [pin A2] - VDD [pin B3] ### U2 — [STM32L431RBT6](https://www.flux.ai/vasyl/stm32l431rbt6~kmn.md) - Role Details: Controls A-mode and LIPUS operation, T/R switching, pulser enable, ADC acquisition, and safety interlocks - Manufacturer Name: STMicroelectronics - Role: Main controller - Part Type: Microcontroller - Manufacturer Part Number: STM32L431RBT6 - Datasheet URL: https://www.st.com/content/ccc/resource/technical/document/datasheet/group3/83/b3/60/f6/b1/cc/47/7e/DM00257211/files/DM00257211.pdf/jcr:content/translations/en.DM00257211.pdf - Package: LQFP **Pins:** - NRST [pin 7] - PA0 [pin 14] - PA1 [pin 15] - PA10 [pin 43] - PA11 [pin 44] - PA12 [pin 45] - PA13 [pin 46] - PA14 [pin 49] - PA15 [pin 50] - PA2 [pin 16] - PA3 [pin 17] - PA4 [pin 20] - PA5 [pin 21] - PA6 [pin 22] - PA7 [pin 23] - PA8 [pin 41] - PA9 [pin 42] - PB0 [pin 26] - PB1 [pin 27] - PB10 [pin 29] - PB11 [pin 30] - PB12 [pin 33] - PB13 [pin 34] - PB14 [pin 35] - PB15 [pin 36] - PB2 [pin 28] - PB3 [pin 55] - PB4 [pin 56] - PB5 [pin 57] - PB6 [pin 58] - PB7 [pin 59] - PB8 [pin 61] - PB9 [pin 62] - PC0 [pin 8] - PC1 [pin 9] - PC10 [pin 51] - PC11 [pin 52] - PC12 [pin 53] - PC13 [pin 2] - PC14 [pin 3] - PC15 [pin 4] - PC2 [pin 10] - PC3 [pin 11] - PC4 [pin 24] - PC5 [pin 25] - PC6 [pin 37] - PC7 [pin 38] - PC8 [pin 39] - PC9 [pin 40] - PD2 [pin 54] - PH0 [pin 5] - PH1 [pin 6] - PH3 [pin 60] - VBAT [pin 1] - VDD [pin 32] - VDD [pin 64] - VDD [pin 19] - VDD [pin 48] - VDDA [pin 13] - VSS [pin 18] - VSS [pin 47] - VSS [pin 63] - VSS [pin 31] - VSSA [pin 12] ### U3 — [AD8336ACPZ-RL](https://www.flux.ai/lcsc/ad8336acpz-rl~wgf6.md) - Role: Receive VGA - LCSC Part Number: C652712 - Part Type: Programmable/Variable Gain Amplifiers (PGAs/VGAs) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Analog-Devices-AD8336ACPZ-RL_C652712.pdf - JLCPCB Part Class: Extended Part - Manufacturer Part Number: AD8336ACPZ-RL - Package: LFCSP-16 - Product Info Url: https://lcsc.com/product-detail/Pre-ordered-Products_Analog-Devices_AD8336ACPZ-RL_Analog-Devices-ADI-LINEAR-AD8336ACPZ-RL_C652712.html - Role Details: Amplifies and gain-controls the returned transducer echo signal before digitization - Package or Case Code: LFCSP-16_L4.0-W4.0-P0.65-TL-EP2.0 - Manufacturer Name: ADI(亚德诺) **Pins:** - EP [pin 17] - GNEG [pin 12] - GPOS [pin 11] - INPN [pin 5] - INPP [pin 4] - NC [pin 6] - NC [pin 7] - NC [pin 15] - NC [pin 16] - NC [pin 14] - PRAO [pin 8] - PWRA [pin 2] - VCOM [pin 3] - VGAI [pin 9] - VNEG [pin 10] - VOUT [pin 1] - VPOS [pin 13] ### U4 — [ADA4938-1](https://www.flux.ai/kicad-part-library/ada4938-1~lgz.md) - Role Details: Buffers and converts the receive chain output for the ADC input - Package: LFCSP - Manufacturer Name: Texas Instruments Inc. - Package or Case Code: LFCSP-16-1EP_3x3mm_P0.5mm_EP1.3x1.3mm_ThermalVias - Role: ADC driver - Manufacturer Part Number: ADA4938-1 - Datasheet URL: https://www.analog.com/media/en/technical-documentation/data-sheets/ADA4938-1_4938-2.pdf **Pins:** - 11 [pin 11] - 10 [pin 10] - - [pin 3] - + [pin 2] - ~{PD} [pin 12] - FB- [pin 1] - FB+ [pin 4] - PAD [pin 17] - V_{OCM} [pin 9] - V- [pin 14] - V- [pin 13] - V- [pin 16] - V- [pin 15] - V+ [pin 5] - V+ [pin 8] - V+ [pin 7] - V+ [pin 6] ### U5 — [AD6644](https://www.flux.ai/vasy_skral/ad6644~5a9.md) - Package: LQFP-52 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: AD6644ASTZ-40 - Role: Receive ADC - Role Details: Samples the ultrasound receive signal for MCU processing - Manufacturer Name: Analog Devices Inc. - Datasheet URL: https://www.analog.com/media/en/technical-documentation/data-sheets/AD6644.pdf - Part Type: Integrated Circuit **Pins:** - ~AIN [pin 12] - ~ENCODE [pin 6] - AIN [pin 11] - AVCC [pin 28] - AVCC [pin 14] - AVCC [pin 26] - AVCC [pin 30] - AVCC [pin 18] - AVCC [pin 8] - AVCC [pin 16] - AVCC [pin 9] - AVCC [pin 22] - C1 [pin 20] - C2 [pin 24] - D0 [pin 36] - D1 [pin 37] - D10 [pin 48] - D11 [pin 49] - D12 [pin 50] - D13 [pin 51] - D2 [pin 38] - D3 [pin 39] - D4 [pin 40] - D5 [pin 41] - D6 [pin 44] - D7 [pin 45] - D8 [pin 46] - D9 [pin 47] - DMID [pin 35] - DNC [pin 31] - DRY [pin 52] - DVCC [pin 1] - DVCC [pin 43] - DVCC [pin 33] - ENCODE [pin 5] - GND [pin 13] - GND [pin 7] - GND [pin 29] - GND [pin 27] - GND [pin 4] - GND [pin 19] - GND [pin 2] - GND [pin 42] - GND [pin 10] - GND [pin 23] - GND [pin 15] - GND [pin 17] - GND [pin 21] - GND [pin 25] - GND [pin 34] - OVR [pin 32] - VREF [pin 3] ### U6 — [INA180A2IDBVT](https://www.flux.ai/adrian95/ina180a2idbvt~ur0.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.ti.com/lit/ds/symlink/ina180.pdf - Role Details: Measures pulser current through a shunt for therapy safety interlock - Part Type: Integrated Circuit - Role: Current monitor - Package: SOT-23-5 - Manufacturer Part Number: INA180A2IDBVT - Manufacturer Name: Texas Instruments **Pins:** - GND [pin 2] - IN- [pin 4] - IN+ [pin 3] - OUT [pin 1] - VS [pin 5] ### U7 — [XC6220B331MR](https://www.flux.ai/kicad-part-library/xc6220b331mr~l55.md) - Role Details: Primary low-noise 3.3 V regulator for MCU, sensors, and digital logic - Package or Case Code: SOT-23-5 - Package: SOT-23-5 - Datasheet URL: https://www.torexsemi.com/file/xc6220/XC6220.pdf - Role: 3.3 V LDO - Manufacturer Part Number: XC6220B331MR **Pins:** - CE [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] ### U8 — [LT8364EMSE](https://www.flux.ai/torn8to/lt8364emse~ov.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Analog Devices - Part Type: Power Source - Package or Case Code: MSE-16 (12) - Manufacturer Part Number: LT8364EMSE#PBF - Datasheet URL: https://www.analog.com/media/en/technical-documentation/data-sheets/lt8364.pdf - Substitute Manufacturer Part Number: LT8362 - Role Details: Generates HV_TX rail in the 20 V to 60 V range for the pulser block - Role: High-voltage boost converter - Max Output Voltage: 60V - Package: MSOP/DFN **Pins:** - BIAS [pin 7] - EN/UVLO [pin 1] - FBX [pin 9] - INTVCC [pin 5] - NC [pin 6] - RT [pin 10] - SS [pin 11] - SW1 [pin 16] - SW2 [pin 14] - SYNC/MODE [pin 12] - VC [pin 8] - VIN [pin 3] ### U9 — [DS18B20U](https://www.flux.ai/lcsc/ds18b20u~z01d.md) - Standby Current: 750nA - Package or Case Code: MSOP-8_L3.0-W3.0-P0.65-LS4.9-BL - LCSC Part Number: C695836 - Role Details: Provides DS18B20-compatible thermal monitoring for over-temperature shutdown - Product Info Url: https://lcsc.com/product-detail/Temperature-Sensors_UMW-Youtai-Semiconductor-Co-Ltd-DS18B20U_C695836.html - Manufacturer Part Number: DS18B20U - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2311091737_UMW-Youtai-Semiconductor-Co---Ltd--DS18B20U_C695836.pdf - Part Type: Temperature Sensors - Manufacturer Name: UMW(友台半导体) - Role: Digital temperature sensor - Supply Voltage: 2.5~5.5V - Package: MSOP-8 - Operating Temperature: -55~+125℃ - JLCPCB Part Class: Extended Part **Pins:** - DQ [pin 1] - GND [pin 4] - NC [pin 2] - NC [pin 3] - NC [pin 6] - NC [pin 7] - NC [pin 5] - VDD [pin 8] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/abhimaaan/wearable-ultrasound-collar~iw](https://www.flux.ai/abhimaaan/wearable-ultrasound-collar~iw).* --- *Generated from [https://www.flux.ai/abhimaaan/wearable-ultrasound-collar~iw](https://www.flux.ai/abhimaaan/wearable-ultrasound-collar~iw)*