# Foolish Blush Power Laces ## Description USB-C Powered Ultra-Low-Power Environmental Sensor Node (ESP32-C6 + SHT45) ## Project Details - **Owner:** jeffwilde-flux - **Created:** 1/29/2026 - **Last Updated:** 1/29/2026 - **Visibility:** Public - **Stars:** 1 ## Key Components ### D1 — [ESD321DPYR](https://www.flux.ai/corvus96/esd321dpyr~2s.md) - Datasheet URL: https://www.ti.com/lit/ds/symlink/esd321.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1690491326127&ref_url=https%253A%252F%252Fwww.ti.com%252Fgeneral%252Fdocs%252Fsuppproductinfo.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Fesd321 - Manufacturer Part Number: ESD321DPYR - Manufacturer Name: Texas Instruments - Role: TVS Diode - Role Details: Low-capacitance (<1pF) ESD diode for USB D+ and D- protection **Pins:** - GND [pin 2] - IO [pin 1] ### D2 — [ESD321DPYR](https://www.flux.ai/corvus96/esd321dpyr~2s.md) - Manufacturer Name: Texas Instruments - Manufacturer Part Number: ESD321DPYR - Datasheet URL: https://www.ti.com/lit/ds/symlink/esd321.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1690491326127&ref_url=https%253A%252F%252Fwww.ti.com%252Fgeneral%252Fdocs%252Fsuppproductinfo.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Fesd321 - Role Details: Low-capacitance (<1pF) ESD diode for USB D+ and D- protection - Role: TVS Diode **Pins:** - GND [pin 2] - IO [pin 1] ### J1 — [USB-C 2.0 Receptacle](https://www.flux.ai/corynrobinson/usb-c-20-receptacle~cf.md) - Purchase Url: https://www.digikey.com/en/products/detail/gct/USB4105-GF-A/11198441 - Manufacturer Part Number: USB4105-GF-A - Part Type: USB C - Role: USB-C Connector - Role Details: USB-C receptacle for VBUS power input and optional USB2.0 D+/D- - Manufacturer Name: GTC - Datasheet URL: https://gct.co/files/drawings/usb4105.pdf **Pins:** - CC1 [pin 6] - CC2 [pin 12] - D- [pin 9] - D- [pin 7] - D+ [pin 10] - D+ [pin 8] - GND [pin 15] - GND [pin 1] - GND [pin 16] - GND [pin 2] - SBU1 [pin 11] - SBU2 [pin 5] - VBUS [pin 14] - VBUS [pin 13] - VBUS [pin 4] - VBUS [pin 3] ### U1 — [TPS25942ARVCR](https://www.flux.ai/lcsc/tps25942arvcr~24ff.md) - JLCPCB Part Class: Extended Part - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Texas-Instruments-TPS25942ARVCR_C181295.pdf - Package or Case Code: QFN-20_L4.0-W3.0-P0.5-BL-EP - LCSC Part Number: C181295 - Role Details: eFuse on VBUS providing reverse blocking, OVP, UVLO, and current limit for 0.5A-3A USB-C sources - Manufacturer Part Number: TPS25942ARVCR - Part Type: Battery Management ICs - Role: Input Protection eFuse - Product Info Url: https://lcsc.com/product-detail/PMIC-Battery-Management_TI_TPS25942ARVCR_TPS25942ARVCR_C181295.html - Manufacturer Name: TI(德州仪器) **Pins:** - ~{FLT} [pin 20] - DMODE [pin 1] - dVdT [pin 18] - EN [pin 14] - EP [pin 21] - GND [pin 16] - ILIM [pin 17] - IMON [pin 19] - IN [pin 9] - IN [pin 10] - IN [pin 13] - IN [pin 11] - IN [pin 12] - OUT [pin 4] - OUT [pin 5] - OUT [pin 6] - OUT [pin 8] - OUT [pin 7] - OVP [pin 15] - PGOOD [pin 2] - PGTH [pin 3] ### U2 — [TPS62840DLCR](https://www.flux.ai/lcsc/tps62840dlcr~fpxf.md) - Manufacturer Name: TI(德州仪器) - Part Type: DC-DC Converters - JLCPCB Part Class: Extended Part - LCSC Part Number: C2071859 - Role Details: Low-Iq buck to generate 3.3V always-on rail from protected 5V - Manufacturer Part Number: TPS62840DLCR - Package or Case Code: VSON-8_L2.0-W1.5-P0.50-BL - Role: 3.3V Buck Converter **Pins:** - EN [pin 4] - GND [pin 1] - MODE [pin 3] - STOP [pin 6] - SW [pin 7] - VIN [pin 2] - VOS [pin 8] - VSET [pin 5] ### U4 — [ESP32-C6-MINI-1-N4](https://www.flux.ai/vasyl/esp32-c6-mini-1-n4~0jh.md) - Manufacturer Part Number: ESP32-C6-MINI-1-N4 - Manufacturer Name: Espressif Systems - Part Type: RF module - Role: MCU + Wi-Fi + BLE Module - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-c6-mini-1_mini-1u_datasheet_en.pdf - Role Details: 2.4GHz Wi-Fi + BLE 5.x MCU module for low-power sensor node - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 3V3 [pin 3] - EN [pin 8] - GND_1 [pin 1] - GND_1__1 [pin 2] - GND_1__10 [pin 42] - GND_1__11 [pin 43] - GND_1__12 [pin 44] - GND_1__13 [pin 45] - GND_1__14 [pin 46] - GND_1__2 [pin 11] - GND_1__3 [pin 14] - GND_1__4 [pin 36] - GND_1__5 [pin 37] - GND_1__6 [pin 38] - GND_1__7 [pin 39] - GND_1__8 [pin 40] - GND_1__9 [pin 41] - GND_2 [pin 47] - GND_2__1 [pin 48] - GND_2__10 [pin 49_9] - GND_2__11 [pin 50] - GND_2__12 [pin 51] - GND_2__13 [pin 52] - GND_2__14 [pin 53] - GND_2__2 [pin 49_1] - GND_2__3 [pin 49_2] - GND_2__4 [pin 49_3] - GND_2__5 [pin 49_4] - GND_2__6 [pin 49_5] - GND_2__7 [pin 49_6] - GND_2__8 [pin 49_7] - GND_2__9 [pin 49_8] - IO0 [pin 12] - IO1 [pin 13] - IO12 [pin 17] - IO13 [pin 18] - IO14 [pin 19] - IO15 [pin 20] - IO18 [pin 24] - IO19 [pin 25] - IO2 [pin 5] - IO20 [pin 26] - IO21 [pin 27] - IO22 [pin 28] - IO23 [pin 29] - IO3 [pin 6] - IO4 [pin 9] - IO5 [pin 10] - IO6 [pin 15] - IO7 [pin 16] - IO8 [pin 22] - IO9 [pin 23] - NC [pin 21] - NC [pin 4] - NC__1 [pin 7] - NC__5 [pin 32] - NC__6 [pin 33] - NC__7 [pin 34] - NC__8 [pin 35] - RXD0 [pin 30] - TXD0 [pin 31] ### U5 — [SHT45-AD1F-R2](https://www.flux.ai/adrian95/sht45-ad1f-r2~q80.md) - Role: Temp/Humidity Sensor - Role Details: Digital humidity + temperature sensor over I2C - Package or Case Code: SHT4X - Manufacturer Name: Sensirion AG - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Sensor - Manufacturer Part Number: SHT45-AD1F-R2 - Datasheet URL: https://sensirion.com/media/documents/33FD6951/67EB9032/HT_DS_Datasheet_SHT4x_5.pdf **Pins:** - SCL [pin 2] - SDA [pin 1] - VDD [pin 3] - VSS [pin 4] ### U6 — [MP5090GC-Z](https://www.flux.ai/monolithicpower/mp5090gc-z~gz.md) - Role Details: Sensor rail power gating to achieve sub-5uA sleep by shutting off sensor domain - Package or Case Code: WLCSP-1p05x1p6_MP5090_MNP - Manufacturer Part Number: MP5090GC-Z - Product Info Url: https://www.monolithicpower.com/en/catalog/product/view/id/484?utm_source=ultralibrarian&utm_medium=component_search&utm_campaign=listing - Role: Load Switch - Manufacturer Name: Monolithic Power Systems - Product Image Url: https://www.monolithicpower.com/pub/media/catalog/product/M/P/MP5090_484_1.jpg - Datasheet URL: https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP5090 **Pins:** - EN1 [pin C2] - EN2 [pin D2] - GND [pin B2] - IN1 [pin A1] - IN2 [pin D1] - OUT1 [pin B1] - OUT2 [pin C1] - VCC [pin A2] ### Y1 — [RFECA3216060A1T](https://www.flux.ai/adrian95/rfeca3216060a1t~8ja.md) - Manufacturer Name: Walsin Technology Corporation - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: RFECA3216060A1T - Role Details: 2.4GHz chip antenna for Wi-Fi/BLE with external matching network - Part Type: Antenna - Datasheet URL: http://www.passivecomponent.com/wp-content/uploads/2018/10/ASC_RFECA3216060A1T_V09.pdf - Role: 2.4GHz Antenna **Pins:** - 1 [pin 1] - 2 [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/jeffwilde-flux/foolish-blush-power-laces~sv](https://www.flux.ai/jeffwilde-flux/foolish-blush-power-laces~sv).* --- *Generated from [https://www.flux.ai/jeffwilde-flux/foolish-blush-power-laces~sv](https://www.flux.ai/jeffwilde-flux/foolish-blush-power-laces~sv)*