AP-1.8V Voltage Regulator Inquiry

flux

0:00

Work done
  • Renamed the ESP32 module from ESP32-32E to U3 without altering any existing nets.
  • Wired the new labeled nets for the added subsystems:
    • Display U1: SPI_SCK, SPI_MOSI, DISP_CS, DISP_DC, DISP_RST, BL_PWM, plus power to Net 9 and GND.
    • GSR AFE U2: GSR_ADC to U3 SENSOR_VP (GPIO36), powered from Net 9 with local decoupling C14.
Final GPIO mapping
  • Display U1
    • SPI_SCK -> U3 IO18 (via series R88)
    • SPI_MOSI -> U3 IO23 (via series R89)
    • DISP_CS -> U3 IO16
    • DISP_DC -> U3 IO19
    • DISP_RST -> U3 IO14
    • BL_PWM -> U3 IO25
  • GSR
    • GSR_ADC -> U3 SENSOR_VP (GPIO36)
ERC summary
  • ERC still reports 1 error: "Missing Power" on display U1.
Blocker / why I cannot reach 0 ERC errors
  • The ERC engine flags U1 as missing power even though VCC is connected to Net 9 and GND is connected to GND.
  • I attempted a metadata-only fix (property edit) and also attempted to explicitly tie U1 to the regulator pins, but rewrite_connections cannot target AP-3.3V because its refdes contains a hyphen (tool restriction: refdes must be alphanumeric), so I cannot complete that workaround.
Next steps
  • If you allow it, I can rename AP-3.3V (and optionally AP-1.8V) to alphanumeric refdes (e.g., U4, U5) with no net changes, then explicitly connect U1 VCC/GND to the regulator pins and re-run ERC. Alternatively, we can replace the display symbol with one whose VCC pin is typed correctly (but that would destroy its nets and require re-wiring).
20 days
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MAX
U1
3.3V
MAX-INT
MAX-INT
R88 P2 - U1 SCL
1.8V
3.3V
U1 VCC - U2 V+
3.3V-F
U1 GND - U2 V-
R92 P2 - C15 P1
3.3V
3.3V
3.3V
SDA
U3 IO14 - U1 RST
SCL
U3 IO19 - U1 DC
SCL
U3 IO23 - R89 P1
R88 P2 - U1 SCL
LSM-INT1
U3 IO19 - U1 DC
IO4
U3 IO16 - U1 CS
LSM-INT2
LSM-INT2
IO17
Vin
SCL
3.3V
SDA
U3 IO18 - R88 P1
BL_PWM
3.3V-TTL
U3 IO16 - U1 CS
EN
Vin
3.3V
R89 P2 - U1 SDA
RXD
MAX-INT
SDA
IO-0
R89 P2 - U1 SDA
Vin
LSM-INT1
U3 IO23 - R89 P1
3.3V
U3 IO14 - U1 RST
TXD
EN
U3 IO18 - R88 P1
3.3V-F
3.3V-TTL
1.8V
3.3V
AP-3.3V
Battery
PWR
USB-TTL
C4
Capacitance
22µ F
CNT
C6
Capacitance
0.1µ F
R89
Resistance
33Ω ohms
LSM6
C3
Capacitance
1µ F
C2
Capacitance
1µ F
C8
Capacitance
10µ F
R3
Resistance
10k Ω
R-SDA
Resistance
5.6k Ω
C11
Capacitance
4.7µ F
BOOT
C5
Capacitance
0.1µ F
C7
Capacitance
0.1µ F
R1
Resistance
10k Ω
R6
Resistance
3.3k Ω
R10
Resistance
10k Ω
C1
Capacitance
1µ F
R4
Resistance
10k Ω
R9
Resistance
10k Ω
D-TTL
RESET
R5
Resistance
3.3k Ω
U3
AP-1.8V
R-SCL
Resistance
5.6k Ω
R88
Resistance
33Ω ohms
C13
Capacitance
100n F
C10
Capacitance
0.1µ F
R2
Resistance
10k Ω
C9
Capacitance
0.1µ F
  • Ground
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    A common return path for electric current. Commonly known as ground.
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    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
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  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
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  • RMCF0805JT47K0
    RMCF0805JT47K0
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  • 875105359001
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    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
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Wearable-ESP32 thumbnail
SmartWatch ESP32-32E - MAX30102 - LSM6DSV16X

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$5.86–$9.20

Digi-Key

$13.18–$19.33

LCSC

$31.86–$32.01

Mouser

$42.59

TME

$6.90

Verical

$4.24–$10.31

Assets

dxf

boardShape.dxf

boardShape

Controls