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Design Notes — USB-C WiFi/BLE Environmental Sensor Node
Architecture
- USB-C receptacle
J1provides default 5 V sink input and USB 2.0 full-speed data. - CC configuration uses independent 5.1 kΩ pull-downs:
R1onUSB_CC1,R2onUSB_CC2. - VBUS input is protected by
D2TVS andIC1TPS25210L eFuse. - Protected 5 V rail
VBUS_PROTECTEDfeedsU3AP63203 fixed 3.3 V buck regulator. 3V3powersESP1ESP32-C3-WROOM-02-N4 andU4SHT41-AD1B-R2.ESP1communicates withU4over I2C:IO4=I2C_SDA,IO5=I2C_SCL.- Native USB programming/debug uses
IO18=USB_DN,IO19=USB_DP. - User controls:
SW1reset onESP_EN,SW2boot/download onESP_BOOT/GPIO9. - Status LED:
ESP1:IO6drivesD3throughR14.
Datasheet-grounded design choices
USB-C sink input
- USB-C VBUS connector rating: selected
J1is rated 5 A collectively on VBUS pins and 48 V DC. - Two separate 5.1 kΩ Rd pull-downs are used, one on each CC pin, so a Type-C source supplies 5 V.
- USB data is routed to the ESP32-C3 native USB Serial/JTAG controller and protected by
D1.
TPS25210L eFuse input protection
IC1 TPS25210L provides:- 2.7 V to 5.7 V operating input range.
- 28 V absolute maximum input tolerance.
- Input reverse polarity protection down to -15 V.
- True reverse current blocking with back-to-back FETs.
- Pin-selectable overvoltage clamp;
OVCSELis left open for the 5.7 V clamp selection. - Adjustable current limit through
R5onILM. - Adjustable UVLO through
R3/R4onEN/UVLO.
Configuration used:
Table
| Function | Components | Value | Target |
|---|---|---|---|
| UVLO divider top | R3 | 470 kΩ | ~4 V rising threshold |
| UVLO divider bottom | R4 | 205 kΩ | Datasheet example value |
| Current limit | R5 | 953 Ω | ~3.5 A limit using RILM = 3334 / ILIM |
| PG threshold top | R6 | 100 kΩ | ~4.5 V power-good threshold |
| PG threshold bottom | R7 | 36.5 kΩ | Datasheet example value |
| dV/dt | C3 | 1 nF | ~2 V/ms slew rate |
| Overcurrent timer | C4 | 2.2 nF | ~2 ms blanking |
| Output capacitance | C2 | 10 µF | eFuse output bulk |
AP63203 3.3 V buck regulator
U3 AP63203WU-7 was selected instead of an LDO to avoid thermal loss during Wi-Fi TX peaks and to support low-power operation over 0.5 A to 3 A USB-C sources.Datasheet-recommended AP63203 3.3 V application components used:
Table
| Function | Component | Value |
|---|---|---|
| Input capacitor | C5 | 10 µF |
| Buck inductor | L1 | 3.9 µH |
| Bootstrap capacitor | C6 | 100 nF |
| Output capacitor 1 | C7 | 22 µF |
| Output capacitor 2 | C8 | 22 µF |
ESP32-C3-WROOM-02-N4 module
3V3supply range is 3.0 V to 3.6 V; design uses 3.3 V.- Espressif specifies the external supply must be able to deliver at least 0.5 A.
- Peak Wi-Fi TX current from datasheet: 345 mA at 802.11b, 1 Mbps, 20.5 dBm.
- EN pin is not left floating:
R9= 10 kΩ pull-up to 3.3 V andC11= 1 µF delay/filter capacitor to GND. SW1pulls EN low for reset.SW2pulls GPIO9 low for download/boot mode.- GPIO2 and GPIO8 have 10 kΩ pull-ups (
R12,R13) to satisfy ESP32-C3 boot strapping for download mode.
SHT41 temperature/humidity sensor
U4SHT41 operates from 1.08 V to 3.6 V, so it is compatible with 3.3 V.- I2C address is 0x44 for SHT41-AD1B-R2.
C12= 100 nF local decoupling.- One I2C pull-up pair is used for the bus:
R10/R11= 4.7 kΩ to 3.3 V.
Power budget
Table
| 3.3 V load | Typical / active | Peak / worst case | Notes |
|---|---|---|---|
| ESP32-C3 Wi-Fi TX | 82-345 mA | 345 mA | Highest datasheet active RF peak used |
| SHT41 measurement | 0.5 mA | 100 mA | 100 mA only if 200 mW heater is enabled |
| Status LED | ~1.5-2 mA | ~2 mA | 680 Ω series resistor |
| Pull-ups/dividers | <1 mA | <1 mA | I2C/boot/PG pull-ups |
| Total 3.3 V rail | ~350 mA active | ~448 mA with SHT41 heater | Below 2 A regulator limit |
Input current estimate for AP63203 buck at 5 V, η ≈ 0.9:
- Normal RF active: (3.3 V × 0.35 A) / (5 V × 0.9) ≈ 257 mA.
- Worst case with SHT41 heater: (3.3 V × 0.448 A) / (5 V × 0.9) ≈ 329 mA.
This fits within a 0.5 A USB source while leaving margin. The eFuse current limit is intentionally set high (~3.5 A) so it supports up to 3 A-capable sources and trips for abnormal overloads; firmware should keep heater duty cycle modest when running from low-current USB sources.
Schematic review result
Electrical review returned no ERROR, WARNING, or UNCERTAIN checks after the final wiring pass.
Layout notes for next phase
- Place
ESP1at the board edge with antenna facing outward and no copper under the antenna keepout. - Keep
C9/C10close toESP1:3V3. - Keep
C12close toU4:VDD. - Place
IC1,C1,C2,D2, and USB-C connector close together to minimize surge/current-loop inductance. - Place AP63203
U3,L1,C5,C6,C7, andC8tightly as a switching regulator cluster with a short SW node. - Route USB D+/D- as a short matched pair; full-speed USB is tolerant, but avoid stubs and keep ESD protection near the connector.
Architecture
Datasheet-grounded design choices
USB-C sink input
TPS25210L eFuse input protection
AP63203 3.3 V buck regulator
ESP32-C3-WROOM-02-N4 module
SHT41 temperature/humidity sensor
Power budget
Schematic review result
Layout notes for next phase
