Schematic for Severe Apricot Electromagnetic Shrinking Machine:...

Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Net Portal
A net identifier used to create connectivity to other Net Portal with the same designator. #portal
jharwinbarrozo
43.0M
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
jharwinbarrozo
11.4M
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
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
jharwinbarrozo
1.5M
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
14.3k
RMCF0805JT47K0
47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
jharwinbarrozo
1.2M
875105359001
10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
jharwinbarrozo
1.2M
CTL1206FYW1T
Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
jharwinbarrozo
1.1M

Distributor	Qty 1
	LCSC	$0.96

Test Plan Development Guide

2 months

Create a comprehensive test plan for this project. Define the testing scope, objectives, and key functional and non-functional requirements to be validated. Outline different test categories (e.g., Electrical Testing, Thermal Testing, Mechanical Testing, Environmental Testing, Communication & Interface Testing) and specify test cases, expected outcomes, and pass/fail criteria. If applicable, include test environment setup, automation strategies, edge cases, and potential risks. Provide recommendations for improving test coverage and ensuring reliability.

copilot

2 months

Using

General

Project Schematic

Below is an example of a comprehensive test plan document that you could use for a project like this. You can adjust or expand the details as necessary:

Project Test Plan

Project: Severe Apricot Electromagnetic Shrinking Machine

1. Introduction

This test plan outlines the procedures and strategies for verifying the design and functionality of the project. It defines the testing scope, objectives, and key functional and non-functional requirements. The plan also delineates different test categories, test cases, expected outcomes, pass/fail criteria, test environment setup, automation strategies, identified edge cases, and potential risks.

2. Testing Scope

Scope Includes:

Verification of circuit functions including battery charging, boost operation, and power management using the BQ25895 IC.
Verification of electrical performance including voltage regulation, noise/decoupling, and current limit functionality.
Mechanical and environmental assessments of board mounting, connectors, and overall assembly reliability.
Communication and interface verification for I²C and other control signals.

Out-of-Scope:

Complete PCB fabrication or final assembly stress tests (beyond pre-manufacturing DRC and simulation phases).
In-depth system-level integration with external peripherals, unless specifically outlined.

3. Test Objectives

Verify Functional Correctness: Confirm that the circuit operates per the intended design specifications (e.g., correct charging voltage, proper signal routing on I²C lines).
Ensure Electrical Safety and Reliability: Validate that all electrical parameters (e.g., decoupling capacitor placement and resistor ratings) are within safe operational limits.
Evaluate Environmental Robustness: Test device performance under temperature, humidity, and vibration conditions to simulate real-world operating scenarios.
Confirm Communication Integrity: Verify that communication interfaces between the BQ25895 and the host controller function without errors.

4. Key Requirements Functional Requirements

Battery Charger Operation:
- The charging IC must regulate the battery charge within specified voltage and current limits per the datasheet.
Signal Integrity:
- Communication lines (I²C, status outputs) must maintain integrity over the expected operating range.
Power Distribution:
- Proper decoupling and bypass capacitors are required at each power node.

Non-Functional Requirements

Reliability & Durability:
- The circuit must maintain stable operation under continuous use and multiple charge/discharge cycles.
Thermal Performance:
- Components should not exceed their temperature ratings during peak operation.
Interference Tolerance:
- The design should be resilient to common-mode and electromagnetic interference.
Manufacturability:
- The design must meet the design rule checks (DRC) and footprint assignments to ease PCB fabrication.

5. Test Categories and Cases

Table

Test Category	Test Case Description	Expected Outcome	Pass/Fail Criteria
Electrical Testing	Verify input voltage stability at VBUS, SYS, BAT, and SW pins	Voltage levels must be within the limits specified in the datasheet	Measured voltage deviation within ±5% of target values
	Verify proper functionality of decoupling capacitors (e.g., [C1])	No significant voltage ripple detected; noise filtered out	Ripple < specified threshold (typ. <50mV peak-to-peak)
	Validate battery charging current and voltage profiles	Charging current and voltage should follow the expected curves	Curve matches datasheet characteristics
Thermal Testing	Perform thermal imaging during peak load operation	Identify any hotspots; temperatures remain below component ratings	Maximum temperature remains below datasheet max ratings
	Run temperature chamber tests simulating low and high ambient temps	Device functionality maintained over temperature range	No functional degradation from -20°C to +70°C (example)
Mechanical Testing	Assess solder joint reliability and board mounting robustness	Solder joints remain intact; board withstands mechanical shock/vibration	No mechanical failures after defined test cycles
Environmental Testing	Perform humidity soak tests	No corrosion or leakage in solder joints or components	Visual inspection and electrical continuity unaffected
	Vibration testing per relevant industry standard	The board remains operational under mechanical vibration stresses	No intermittent or persistent faults reported
Communication & Interface Testing	Validate I²C signal integrity between the BQ25895 and microcontroller	I²C bus communication is error-free; proper pull-up resistors in place	Successful data transfers over extended operation times
	Test status indicators and interrupt signals on STAT and INT pins	Correct signal levels indicating operational states	Logic high/low thresholds maintained as per spec

6. Test Environment Setup

Equipment Needed:
- Power supplies and multimeters
- Oscilloscope for waveform analysis
- Thermal imaging camera
- Temperature and humidity chamber
- Vibration simulator
- I²C protocol analyzer
Test Bench Configuration:
- Test fixture with secure board mounting
- Automated scripts for cycling power and reading sensor outputs where applicable

7. Automation Strategies

Test Script Automation:
- Develop automation scripts to cycle the charger and log measurements (voltage, current, temperature).
Data Logging:
- Utilize data acquisition systems to continuously log environmental parameters during tests.
I²C Communication Automation:
- Script I²C bus monitoring to check for communication errors over a long duration.

8. Edge Cases and Potential Risks

Edge Cases:
- Operation at the extremes of voltage and temperature ranges
- Fast transient events causing momentary voltage dips or spikes
- Intermittent I²C communication errors due to noise in a cluttered environment
Potential Risks:
- Component stress due to prolonged thermal cycling may lead to premature failure
- Misplaced or incorrect passive component values causing noisy or unstable operation
- External electromagnetic interference affecting signal integrity

9. Recommendations for Improving Test Coverage and Reliability

Increase Test Resolution:
- Use high-precision measurement instruments to capture small deviations.
Simulate Real-world Scenarios:
- Include tests that mimic real user load conditions and environmental stressors.
Regular Automated Regression Tests:
- Embed test scripts in the workflow to run automatically after design updates.
Peer Reviews and Cross-Verification:
- Have the test plan and results reviewed by separate teams to ensure objective validation.
Document Deviations:
- Maintain detailed records of any deviations encountered during testing and their impact on system performance to guide design refinements.

This plan serves as a starting point. You can refine each section based on the current project specifications and testing resources available, ensuring that all critical aspects of reliability, performance, and safety are thoroughly validated.

Project Properties Setup

Select Additional Components

Update Project Description

2w2w

2 months

hy i want to make powerbank using bq25895 and capacity upto 30000mah output voltage type c

copilot

2 months

Using

General

Chat History

Project Schematic

To better understand your design intent, I have 3 short questions. Let's start with the first one:

Do you plan to use a single-cell battery (with parallel cells for increased capacity) – which is typical for the BQ25895 – or are you considering a different battery configuration to achieve 30000 mAh?

Confirm Battery Configuration

Multiple Parallel Cells

2w2w

2 months

Single-cell battery configuration.

copilot

2 months

Using

General

Chat History

Project Schematic

What output current rating do you require for the USB Type-C port (e.g., 5V/2A, 5V/3A)?
Do you plan to incorporate any additional features, like a fuel gauge or pass-through charging, into the design?

Output current rating

Additional Feature Fuel Gauge

Additional Feature Pass-through Charging

2w2w

2 months

5V/3A.

copilot

2 months

Using

General

Chat History

Project Schematic

Would you like to incorporate any additional features such as a fuel gauge or pass-through charging into your design?

Include fuel gauge

Include pass-through charging

Basic design

2w2w

2 months

Add a fuel gauge for accurate battery level monitoring.

copilot

2 months

Using

General

Chat History

Project Schematic

Based on your responses, your design will be a powerbank using the BQ25895 in a single-cell battery configuration, delivering 5V/3A via a USB Type-C port, and incorporating a fuel gauge for accurate battery level monitoring.

Would you like to update the project properties with these design specifications?

Update project properties

Select main fuel gauge IC

Begin schematic development with current specs

2w2w

2 months

Update the project description to reflect the specifications for a single-cell power bank with a 30,000mAh capacity, a USB-C output of 5V/3A, and a fuel gauge.

copilot

2 months

Using

General

Chat History

Project Schematic

Code Interpreter

The project description has been updated to reflect a single-cell power bank design with a 30,000 mAh capacity, a USB-C output of 5V/3A, and the inclusion of a fuel gauge for accurate battery level monitoring.

What would you like to work on next?

Add fuel gauge IC

Decoupling capacitors

USB-C components

2w2w

2 months

List the recommended decoupling capacitors for the BQ25895 and add them to my schematic.

copilot

2 months

Using

General

Chat History

Project Schematic

Library

The BQ25895 datasheet recommends the following decoupling strategy:

High-Frequency Decoupling:
Use one 100nF ceramic capacitor (typically in a 0402 package) placed as close as possible to the VBUS (and/or SYS) pin to filter high-frequency noise. For example, you can use the 100nF 0402 capacitor.
Bulk Decoupling:
In addition, a 10µF capacitor (typically in a 0603 package) is recommended to provide bulk decoupling for stability under load transients. An option is the 10uF 0603 Capacitor.

I will add these decoupling capacitors to your schematic near the appropriate nodes of the BQ25895: one 100nF capacitor for high-frequency bypassing at the VBUS pin and one 10µF capacitor for bulk decoupling at the supply input.

Add 100nF capacitor

Add 10uF capacitor

Capacitor values verification

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2w2w / Severe Apricot Electromagnetic Shrinking Machine

Schematic

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