# Radical Apricot Jetpack ## Description Wireless Module & Sensor Interface Placement Guidance ## Project Details - **Owner:** glucoseck007 - **Created:** 1/18/2026 - **Last Updated:** 1/22/2026 - **Visibility:** Public - **License:** https://creativecommons.org/licenses/by/4.0/ - **Manufacturing Quantity Target:** 10 - **drc_deprecated_rules_count:** 0 - **review_issues_manufacture_part_number:** {"design_rule_check_manufacture_part_number": []} - **review_issues_erc:** {"decoupling_caps":[],"resistor_power_rating":[],"pull_up_pull_down":[],"capacitor_voltage_rating":[],"parts_available":[]} - **drc_invalid_layer_count:** 0 - **Software:** Bare metal - **Operating Voltage:** 3.3V - **review_issues_drc:** {"design_rule_check_airwires":[],"design_rule_check_floating_copper":[],"design_rule_check_overlapping_copper":[],"design_rule_check_missing_footprints":[],"design_rule_check_invalid_layer":[],"design_rule_check_overlapping_fills":[],"design_rule_check_deprecated_rules":[],"design_rule_check_trace_corner_radius":[],"design_rule_check_protected_intrusions":[]} - **drc_airwires_count:** 0 - **drc_manufacture_part_number_count:** 0 - **drc_floating_copper_count:** 0 - **post_airwires:** [] - **Domain:** Consumer Electronics - **incorrect_net_ties_count:** 0 - **Power Requirements:** USB - **Connectivity:** WiFi, Bluetooth - **value_text_errors_count:** 0 - **manufacturer_part_number_errors_count:** 0 - **MPN Review:** No design_rule_check_manufacture_part_number issues remain; all generic resistors, capacitors, and test points have been replaced with stocked MPN parts and the MPN DRC is clean. - **drc_protected_intrusions_count:** 0 - **Project Description:** Low-Power USB‑C Environmental Temperature & Humidity Sensor Node with Protected 5V→3.3V Supply and Dual Wi‑Fi/BLE Connectivity - **BOM Delta Summary:** Replaced R1, R2 with Yageo RC0603FR-074K7L (4.7 kΩ, 0603, 1%); replaced R3, R4 with Yageo RC0603FR-075K1L (5.1 kΩ, 0603, 1%); replaced C1–C6 with Samsung CL10B104KB8NNNC (100 nF, 50 V, X7R, 0603); replaced C7, C8 with Murata GRM21BR61C106KE15L (10 µF, 16 V, X5R, 0805); replaced TP1, TP2 with Keystone 5015 SMD test points; replaced R5, R7 with Yageo RC0603FR-074K7L (4.7 kΩ, 0603, 1%); replaced R8, R9 with Yageo RC0603FR-075K1L (5.1 kΩ, 0603, 1%); replaced C9, C10 with Samsung CL10B104KB8NNNC (100 nF, 50 V, X7R, 0603) - **drc_trace_corner_radius_count:** 0 - **drc_overlapping_fills_count:** 0 - **initial_review_issues_grouped_by_type:** {"airwires": [], "mpn_errors": []} - **system_auto_layout_warnings_count:** 0 - **missing_net_labels_count:** 0 - **System Architecture:** ```mermaid flowchart TD PS["Power Subsystem"] --> PC["Protection Circuits"] PC --> REG["Regulator 5V->3.3V"] REG --> WM["Wireless Module (Wi-Fi/BLE)"] REG --> SI["Sensor Interface (Temp/Humidity)"] ``` - **BOM Delta Summary:** Replaced R1, R2, R5, R7 with Yageo RC0603FR-074K7L (4.7 kΩ, 0603, 1%); replaced R3, R4, R8, R9 with Yageo RC0603FR-075K1L (5.1 kΩ, 0603, 1%); replaced C1–C6, C9, C10 with Samsung CL10B104KB8NNNC (100 nF, 50 V, X7R, 0603); replaced C7, C8 with Murata GRM21BR61C106KE15L (10 µF, 16 V, X5R, 0805); replaced TP1, TP2 with Keystone 5015 SMD test points - **drc_missing_footprints_count:** 0 - **duplicate_generics_count:** 0 - **manual_routing_checklist:** Priority manual routing checklist 1) Net grouping and order - Route nets in this priority order: (1) GND, (2) 3V3, (3) 5V_PROT & USB_VBUS_IN, (4) I2C (SDA, SCL), (5) UART (UART_TX, UART_RX), (6) LED1_CTRL & LED2_CTRL and other GPIOs. - Keep each functional group physically clustered: - USB-C port & protection (J1, U1, U2, R3, R4, R5) - 5V_PROT regulator input path (U2 OUT to U3 VIN, C1, C2) - 3V3 regulator output island (U3, C7, C8, TP2, R7, C9, C10) - ESP32 module & digital I/O (U4, J2, TP1, LED1, LED2, R8, R9) - I2C sensor pod (U5, R1, R2, C10). - Keep SDA and SCL parallel and similar length from U4 to U5; likewise keep UART_TX and UART_RX roughly parallel between U4 and J2. 2) Layer usage - Use a 4-layer discipline consistent with the project intent: - L1 (Top): primary signal and short power stubs. - L2: solid GND reference plane; avoid cuts, no long signal traces. - L3: short, fat 5V_PROT and local 3V3 distribution; avoid weaving other signals in this plane. - L4 (Bottom): secondary signal escape and short jumpers only when top is congested. - When a signal must change layers, always via into L1/L4, not into the planes directly except for power stitching vias. 3) Trace widths by net type - Power nets: - USB_VBUS_IN and 5V_PROT: >= 0.50 mm on L1/L4, 0.60–0.80 mm on L3 when used as a spine. - 3V3 main rail from U3 to U4 and loads: >= 0.40 mm. - Signals: - General GPIO, LED1_CTRL, LED2_CTRL, EN: 0.20–0.25 mm. - I2C (SDA, SCL) and UART (UART_TX, UART_RX): 0.20–0.25 mm, matched width within each bus. - Local stubs into small 0603 passives may neck down briefly to 0.18 mm if needed for pad entry. 4) Via rules - Standard signal via: finished drill ~0.30 mm, pad ~0.60 mm; use for SDA, SCL, UART, GPIO, LED nets. - Power via: use at least one via pair (or via array) for each transition of USB_VBUS_IN, 5V_PROT, and 3V3 between planes; where space allows, double up vias near U3, U4 supply pins, and test points TP1/TP2. - Keep vias out of the keepout/antenna zone of the ESP32 module and away from USB-C pads and differential pairs. 5) Clearance practices - Global minimum copper clearance: >= 0.20 mm between unrelated nets. - Around USB_VBUS_IN and 5V_PROT: - Maintain >= 0.25 mm clearance to signals and other copper when possible. - Around the ESP32 and RF keepout: - Avoid routing any non-essential traces under the module antenna area; keep at least 1.0 mm away from the antenna outline. - Keep parallel high-level signals (UART, I2C) at least 0.30–0.50 mm away from unrelated fast edges or LED current paths to reduce coupling. 6) Airwire resolution workflow - For each airwire in the DRC list: - Confirm the net name (USB_VBUS_IN, 5V_PROT, 3V3, SDA, SCL, UART_TX, UART_RX, LED1_CTRL, LED2_CTRL, GND, etc.). - Route from source pin to destination along the priority and layer rules above. - Prefer straight or gently bending (45°) segments; avoid acute angles and jogs. - If a via is required, place it near the pad, not mid-span. - After each batch of routed nets, re-run DRC and verify the airwire count is decreasing; continue until all are cleared. 7) Final verification - Ensure every power pin of U3, U4, and U5 has a short, direct connection to its local decoupling capacitor and then to the plane. - Confirm no stubs or islands of copper remain on GND or 3V3/5V_PROT. - Run full DRC and verify: 0 airwires, no clearance violations, and all vias/traces on valid layers. ## Key Components ### J1 — [124018312112A](https://www.flux.ai/adrian95/124018312112a~dea.md) - Manufacturer Part Number: 124018312112A - Role: Interface - License: https://creativecommons.org/licenses/by/4.0/ - Package: Right Angle Through Hole - Part Type: Connector - Manufacturer Name: Amphenol ICC (Commercial Products) - Role Details: USB-C power input connector with CC pin support - Datasheet URL: https://cdn.amphenol-cs.com/media/wysiwyg/files/documentation/datasheet/inputoutput/io_waterproof_usb_type_c.pdf **Pins:** - CC1 [pin A5] - CC2 [pin B5] - D1- [pin A7] - D1+ [pin A6] - D2- [pin B7] - D2+ [pin B6] - GND_A [pin A1] - GND_A [pin A12] - GND_B [pin B1] - GND_B [pin B12] - RX1- [pin B10] - RX1+ [pin B11] - RX2- [pin A10] - RX2+ [pin A11] - SBU1 [pin A8] - SBU2 [pin B8] - SHIELD [pin SH2] - SHIELD [pin SH4] - SHIELD [pin SH1] - SHIELD [pin SH3] - TX1- [pin A3] - TX1+ [pin A2] - TX2- [pin B3] - TX2+ [pin B2] - VBUS_A [pin A4] - VBUS_A [pin A9] - VBUS_B [pin B4] - VBUS_B [pin B9] ### J2 — [61300811121](https://www.flux.ai/jecstronic/61300811121~m8u.md) - Manufacturer Name: Würth Elektronik - Role Details: Programming/debug header exposing UART0 TX/RX and boot mode pins - Manufacturer Part Number: 61300811121 - Package: Through Hole - Role: Connector - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.we-online.com/components/products/datasheet/6130xx11121.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] ### LED1 — [150060VS55040](https://www.flux.ai/adrian95/150060vs55040~c2q.md) - Datasheet URL: https://www.we-online.com/components/products/datasheet/150060VS55040.pdf - Role: Indicator - Part Type: LED - Package: SMD_0603_1608Metric - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 150060VS55040 - Role Details: Status indicator LED for power and network status - Manufacturer Name: Würth Elektronik **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [150060VS55040](https://www.flux.ai/adrian95/150060vs55040~c2q.md) - Role: Indicator - Manufacturer Name: Würth Elektronik - Manufacturer Part Number: 150060VS55040 - Role Details: Status indicator LED for power and network status - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED - Package: SMD_0603_1608Metric - Datasheet URL: https://www.we-online.com/components/products/datasheet/150060VS55040.pdf **Pins:** - A [pin 2] - K [pin 1] ### TP1 — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Role: Test Point - Role Details: Power rail test point for measurement of 5V and 3.3V nets **Pins:** - P1 ### TP1 — [5015](https://www.flux.ai/adietz12/5015~jd.md) - Datasheet URL: https://www.keyelco.com/userAssets/file/M65p55.pdf - Manufacturer Name: Keystone Electronics - Manufacturer Part Number: 5015 **Pins:** - TP [pin TP] ### TP2 — [5015](https://www.flux.ai/adietz12/5015~jd.md) - Manufacturer Part Number: 5015 - Datasheet URL: https://www.keyelco.com/userAssets/file/M65p55.pdf - Manufacturer Name: Keystone Electronics **Pins:** - TP [pin TP] ### U1 — [TPD6S300RUKR](https://www.flux.ai/jecstronic/tpd6s300rukr~282.md) - Role Details: ESD protection for USB-C CC and VBUS pins - Datasheet URL: https://www.ti.com/lit/ds/symlink/tpd6s300a.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Package: 20-WQFN - Role: Protection - Manufacturer Part Number: TPD6S300RUKR - Manufacturer Name: Texas Instruments Inc. **Pins:** - ~FLT [pin 9] - C_CC1 [pin 4] - C_CC2 [pin 5] - C_SBU1 [pin 1] - C_SBU2 [pin 2] - CC1 [pin 12] - CC2 [pin 11] - D1 [pin 20] - D2 [pin 19] - GND_1 [pin 8] - GND_2 [pin 13] - GND_3 [pin 18] - N.C._1 [pin 16] - N.C._2 [pin 17] - RPD_G1 [pin 7] - RPD_G2 [pin 6] - SBU1 [pin 15] - SBU2 [pin 14] - THERMAL_PAD [pin 21] - VBIAS [pin 3] - VPWR [pin 10] ### U2 — [5V eFuse](https://www.flux.ai/corynrobinson/5v-efuse~ci.md) - Product Info Url: https://www.ti.com/product/TPS25200 - Manufacturer Part Number: TPS25200DRVR - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps25200.pdf?ts=1643733993618&ref_url=https%253A%252F%252Fwww.ti.com%252Fpower-management%252Fpower-switches%252Fefuse-hotswap-controllers%252Fproducts.html - Package or Case Code: 6-WSON - Voltage: 5V - Role: Protection - Role Details: eFuse with over-current protection and undervoltage lockout for 5 V rail - Purchase Url: https://octopart.com/tps25200drvt-texas+instruments-38819194?r=sp - Manufacturer Name: Texas Instruments **Pins:** - *FAULT - EN - EPAD - GND - ILIM - IN - OUT ### U3 — [NB680GD-P](https://www.flux.ai/monolithicpower/nb680gd-p~ie.md) - Role Details: DC-DC step-down regulator 5 V to 3.3 V with low quiescent current sleep mode - Manufacturer Name: Monolithic Power Systems - Datasheet URL: https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/NB680 - Role: Power Conversion - Package or Case Code: QFN-12_NB680_MNP - Product Info Url: https://www.monolithicpower.com/en/catalog/product/view/id/1043?utm_source=ultralibrarian&utm_medium=component_search&utm_campaign=listing - Manufacturer Part Number: NB680GD-P - Product Image Url: https://www.monolithicpower.com/pub/media/catalog/product/N/B/NB680_1043_1.jpg **Pins:** - AGND [pin 10] - BST [pin 8] - CLK [pin 4] - EN [pin 11] - ENCLK [pin 12] - LDO [pin 6] - PG [pin 3] - PGND [pin 2] - SW [pin 7] - VCC [pin 9] - VIN [pin 1] - VOUT [pin 5] ### U4 — [ESP32-WROOM-32D](https://www.flux.ai/vasyl/esp32-wroom-32d~7py.md) - Manufacturer Part Number: ESP32-WROOM-32D - Package: Through Hole Module - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Espressif Systems - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf - Environment: Industrial (-40 °C to 85 °C, EMI class) - Part Type: Microcontroller - Role Details: Dual-radio Wi-Fi 802.11 b/g/n + BLE 5.x module - Copper Planes: Layer 2: GND, Layer 3: 5V - Stackup: Standard 4 Layer - Role: Signal Generation **Pins:** - 3.3V [pin 2] - AGND [pin 39] - CLK [pin 20] - CMD [pin 19] - EN [pin 3] - GND [pin 38] - GND [pin 15] - GND [pin 1] - IO0 [pin 25] - IO12 [pin 14] - IO13 [pin 16] - IO14 [pin 13] - IO15 [pin 23] - IO16 [pin 27] - IO17 [pin 28] - IO18 [pin 30] - IO19 [pin 31] - IO2 [pin 24] - IO21 [pin 33] - IO22 [pin 36] - IO23 [pin 37] - IO25 [pin 10] - IO26 [pin 11] - IO27 [pin 12] - IO32 [pin 8] - IO33 [pin 9] - IO34 [pin 6] - IO35 [pin 7] - IO4 [pin 26] - IO5 [pin 29] - NC [pin 32] - RXD0 [pin 34] - SD0 [pin 21] - SD1 [pin 22] - SD2 [pin 17] - SD3 [pin 18] - TXD0 [pin 35] - VN [pin 5] - VP [pin 4] ### U5 — [Si7021-A20-IM1R](https://www.flux.ai/adrian95/si7021-a20-im1r~ref.md) - Part Type: Integrated Circuit - Datasheet URL: https://download.mikroe.com/documents/datasheets/Si7021-A20_datasheet.pdf - Role Details: Digital temperature and humidity sensor with I²C interface - Manufacturer Part Number: Si7021-A20-IM1R - Package: DFN-6 - Manufacturer Name: Silicon Labs - Role: Sensing (Shunt) - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - DNC_1 [pin 3] - DNC_2 [pin 4] - EP [pin 7] - GND [pin 2] - SCL [pin 6] - SDA [pin 1] - VDD [pin 5] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/glucoseck007/radical-apricot-jetpack~ca](https://www.flux.ai/glucoseck007/radical-apricot-jetpack~ca).* --- *Generated from [https://www.flux.ai/glucoseck007/radical-apricot-jetpack~ca](https://www.flux.ai/glucoseck007/radical-apricot-jetpack~ca)*