Schematic Design Review

flux

2:43

Project
Review (ERC/DRC)
Schematic

Using Schematic Tool.

Using Review (ERC/DRC) Tool.

Here are the issues observed directly in your schematic, organized by category, with actionable corrections:
1. Electrical and Logical Issues
  • Missing I²C pull-ups
    The I²C bus lines lack pull-up resistors (R5 and R16 are series resistors, not pull-ups).
    → Add two 4.7 kΩ pull-ups on SDA and SCL, e.g.:
  • No CAN bus termination
    The CAN transceiver U7 has only a series resistor R6 on CAN_H. There is no 120 Ω termination across CAN_H/CAN_L.
    → Add a 120Ω Resistor between CAN_H and CAN_L.
  • No RS-485 termination or failsafe
    The RS-485 transceiver U5 has no 120 Ω termination resistor between A and B and no bias resistors for failsafe.
    → Add a 120Ω Resistor across A/B, plus two 4.7k Resistor bias resistors (pull-up on A, pull-down on B).
  • Shared RESET/EN net
    R29 pulls up together:
    • U4 EN
    • U3 ~RESET
    • Display reset (U20)
      Tying these functions together can cause unintended resets or keep-alive behavior.
      → Split into two nets with separate pull-ups: one resistor for EN, one for ~RESET/display RESET.
2. Component-Level Review
  • Local decoupling missing on level translator
    U1 (TXS0102) needs a 0.1 µF cap on both VCCA and VCCB, placed close to its pins.
    → Add two 100 nF Capacitor.
  • Decoupling missing on CAN and RS-485 transceivers
    Neither U7 nor U5 have a local bypass capacitor.
    → Place a 100 nF Capacitor adjacent to each VCC pin.
  • LDO decoupling values
    U6 (AMS1117-3.3) has C3/C4 = 22 µF (6.3 V) and C6 = 10 µF. The datasheet calls for 10 µF minimum. Using 22 µF is acceptable, but ensure the voltage rating ≥ 10 V.
  • LED current-limits
    LED1 channels each have series resistors R1, R4, R17. Verify their values suit your target LED current.
3. Power and Signal Integrity
  • Star-ground recommended
    Multiple ground portals are scattered across the schematic. For best noise performance, tie all analog/digital ground returns to a single star-point.
  • Power‐rail annotations
    Clearly label 5 V vs. 3.3 V rails (instead of generic net names) so decoupling and protection components are unambiguous.
4. Schematic Best Practices
  • Unnamed nets
    Many nets show as “Net 1”, “Net 4”, etc. Replace with descriptive labels (e.g. “SPI_SCK”, “VBUS_IN”) for readability.
  • RouteBranchPoint clutter
    The “RouteBranchPoint” symbols add visual noise. Use junction dots on multi-pin nets or explicit net labels instead.
  • Consistent net naming
    Ensure all connectors, modules, and ports use the same net names across the schematic (e.g. CAN_H, CAN_L, SDA, SCL) to avoid confusion.
Addressing the above will strengthen power stability, bus reliability, and overall clarity of your design.
Add I²C pull-ups
Add CAN termination
Decoupling on level shifter
Implement star ground
Rename nets descriptively
253 days

Ready.

Sign up to send
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Net Portal
    Net Portal
    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
    jharwinbarrozo
    43.0M
  • Power Net Portal
    Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
    jharwinbarrozo
    11.4M
  • Generic Resistor
    Generic Resistor
    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
    jharwinbarrozo
    1.5M
  • Generic Capacitor
    Generic Capacitor
    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #generics
    jharwinbarrozo
    15.4k
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • RMCF0805JT47K0
    RMCF0805JT47K0
    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
    jharwinbarrozo
    1.1M
ESP32 Battery Management System Controller Board e5Wk thumbnail
A smart ESP32-based battery management system controller board for Lithium ion battery packs/cells. Capable of communicating to wide varieties of hybrid-smart inverters with CANbus, RS485 and UART communication.

Properties

Pricing & Availability

Distributor

Qty 1

Arrow

$6.55–$10.05

Digi-Key

$19.49–$31.50

LCSC

$14.14–$14.66

Mouser

$11.71–$11.89

Verical

$4.48–$16.89

Assets

2,8Zoll TFT SPI 240x320.step

2,8Zoll TFT SPI 240x320.step

2,8Zoll TFT SPI 240x320
3_2SPI-TFT-Modul_ILI9341.STEP

3_2SPI-TFT-Modul_ILI9341.STEP

3_2SPI-TFT-Modul_ILI93413D Model
BMS.png

BMS.png

BMSThumbnail
bms.svg

bms.svg

bmsDefault

Controls