• Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
  • Ground
    A common return path for electric current. Commonly known as ground.
  • Net Portal
    A net identifier used to create connectivity to other Net Portal with the same designator. #portal
  • Power Net Portal
    Power net portal is a special schematic object used to define a power or ground net. Power ports allow you to conveniently indicate a power net at any location in the design. Power nets of the same designator automatically connect throughout your design #portal #power
  • 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
  • Generic Capacitor
    A generic fixed capacitor 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 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
  • 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
  • 875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
  • CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
  • 1070TR
    Battery Holder (Open) Coin, 20.0mm 1 Cell SMD (SMT) Tab bate or batt #forLedBlink
explain this project

@copilot explain this project
5mo
Sure! Let’s break down what this project is about and what its components are for.
Project Overview
This project is named BQ2550 Sub-l and focuses on energy harvesting using the Texas Instruments BQ25504 integrated circuit (IC). Energy harvesting circuits like this one typically gather small amounts of power from environmental sources such as solar panels, vibration, or thermal differences.
The BQ25504 is a highly efficient IC designed to manage these energy sources, store the harvested energy into a battery or capacitor, and provide power to a low-powered electronic system.
Project Components and Connections
Here’s a brief rundown of the main components and their functionalities, as well as any notable connections:
Primary IC: BQ25504 (Designator: IC1)

  • Pins and Functions:

    • VSS (1, 13): Ground pins
    • VIN_DC (2): Input voltage from a DC power source
    • VOC_SAMP (3): Sampled open-circuit voltage from an energy-harvesting source
    • VREF_SAMP (4): Reference voltage for internal operations
    • OT_PROG (5): Over-temperature programming
    • VBAT_OV (6): Battery over-voltage threshold setting
    • VRDIV (7): Resistor divider used for VOC_SAMP
    • VBAT_UV (8): Battery under-voltage threshold setting
    • OK_HYST (9): Sets hysteresis on OK_PROG output
    • OK_PROG (10): Programmable threshold indicator
    • VBAT_OK (11): Indicates if the battery voltage is within acceptable range
    • AVSS (12): Analog ground
    • VBAT (14): Battery connection
    • VSTOR (15): Energy storage output
    • LBST (16): Boost inductor connection
    • PAD (17): Thermal pad should be connected to ground
Resistors

  • Various resistors (R1, R2, R3, etc.) with specified resistance values are used for setting different voltage thresholds and providing feedback.

    • Examples:

      • R5: 5.90MΩ, forming part of the resistor divider network.
      • R4: 4.42MΩ, likely involved in voltage sensing.
Capacitors

  • Capacitors (C1, C2, C3, C4) serve to filter and stabilize voltages, smoothing out the power supply to avoid noise and fluctuations.

    • Examples:

      • C1 and C3: 4.7µF, probably used for decoupling and energy storage.
      • C4: 0.01µF, possibly used for finer filtering tasks.
Inductor

  • L1: 22µH, used as a part of the boost converter circuit to step up the voltage as required for the storage element or load.
Nets

  • VBAT_OV, VBAT_UV, VBAT_OK, VIN_DC, OK_PROG, OK_HYST: These nets represent various nodes in the circuit, connecting resistors, capacitors, and other elements to the relevant pins on the IC.
Assumptions and Additional Remarks

  • The circuit seems to be designed for energy harvesting using a solar panel, as inferred from the designator SOLAR+ and VIN_DC connections.
  • The resistors and capacitors associated with VBAT_OV, VBAT_UV, and VBAT_OK indicate settings for over and under voltage protection of the battery.
Next Steps
If you have any specific questions or need help with particular aspects of this design, feel free to ask! Whether it's connections, component values, or understanding specific net behaviors, I'm here to help.
5mo
C3
Capacitance
4.7µ F
C2
CBYP
IC1

BQ2550 Sub-l

BQ2550 Sub-l
Description

Created
June 6th 2024
Last updated by tteague
6 months ago
1 Contributor(s)
tteague

Controls

Properties

Part Type
Harvester module
Manufacturer Name
Manufacturer Part Number
Designator Prefix
M

Availability & Pricing

DistributorQty 1
Digi-Key$2.36–$4.79
LCSC$3.07
Mouser$3.30

Assets

    Simulation

    µs

    Simulation Speed

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    Checks that the power traveling across a given resistor is under its rating with 50% headroom.
    Learn more
    Checks that IC pins that require pull up or pull down resistors have them.
    Learn more
    Checks that capacitors have appropriate voltage ratings to prevent overheating and ensure reliable circuit operation.
    Checks that all parts have a part number and are available from distributors.
    Des
    Net
    Des
    Net
    PAD
    GND
    PAD
    GND
    PAD
    GND
    PAD
    GND
    Trace 4e73
    GND
    Trace 8220
    GND
    Trace f522
    GND
    Trace 695c
    GND
    Trace 5e35
    GND
    Trace 0056
    GND
    Reports parts that have no footprint.
    Reports nodes that are assigned to a layer that doesn't exist in the layout stackup.
    Designator
    Ruleset
    *`REF`*
    R7
    *`REF`*
    R4 2
    *`REF`*
    R8
    *`REF`*
    R9
    *`REF`*
    IC1
    *`VALUE`*
    L1 value
    *`REF`*
    R3
    C2
    C4
    *`REF`*
    R2
    *`REF`*
    R4
    *`REF`*
    R5
    C1
    *`REF`*
    R1
    Override rule for
    C3
    Designators
    Net
    BAT, VBAT
    Net (IC1 - VBAT)
    SOLAR+, P2
    Net - (871c - undefined)
    VOC_SAMP, P1
    Net (IC1 - VOC_SAMP)
    Reports nodes that are using rules that are not supported anymore.
    Reports layers that have multiple copper fills of different nets. Make sure the Connected Layers rule value of nets with fills is valid.
    Detect any via, trace or copper fill island that is not connected to any net.