LiPo Charger Circuit Design
2:27
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Planning for haptic driver integration.
Your goal is to build the IP5306 UPS HAT with USB-C power, audio, haptics, and an external controller port wired to Pi I2C/I2S and 5V rails.
Planned steps:
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Add: IP5306, USB-C receptacle, JST-PH-2 right-angle, 470uF Capacitor, Inductor, Tactile Switch, 4x LED + Resistor, WM8960, 2x PJ-320A, DRV2605L, 2-pin pad, JST-SH 6-pin.
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Wire: USB-C VBUS->IP5306 VIN; JST-PH->BATT+/−; IP5306 5V OUT->5V rail; bulk 470–1000 µF at 5V OUT; KEY->switch->GND; LEDx->LED->R->GND; I2C (GPIO2/3) to WM8960, DRV2605L, JST-SH with 4.7 k pull-ups; I2S (GPIO18/19/21/20) to WM8960; DRV2605L OUT->LRA pad; JST-SH pins: 3.3V, GND, SDA, SCL, GPIO17, GPIO27.
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Place: USB-C/JSTs/jacks on board edge; cluster IP5306+inductor+ceramics with short, thick loops; keep audio away from switcher.
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Plan
- Design and implement an IP5306-based LiPo UPS board integrated into a Raspberry Pi HAT template. The design will feature a USB-C input for charging, a right-angle JST-PH battery connector, and a 470–1000 μF bulk capacitor on the 5V rail. It will include a KEY button with 4 associated status LEDs. Additionally, the board will integrate WM8960 codec paired with two PJ-320A jacks for audio, a DRV2605L haptics driver with an LRA pad, and a JST-SH 6-pin connector for an external controller. All components will be wired appropriately to the Pi’s I2C/I2S and 5V rails, with connectors placed at the board edge and switching components clustered to minimize loop inductance.
#Implementation plan
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Power Subsystem and UPS Integration
- Add the IP5306 component and configure connections:
- Connect USB-C VBUS to VIN on IP5306.
- Wire battery connections (BATT+ and BATT−) to the right-angle JST-PH connector.
- Route the 5V output from IP5306 to the board’s 5V rail.
- Place and connect the 470–1000 μF bulk capacitor at the 5V output to stabilize the power supply.
- Integrate the KEY button and connect it to ground through a tactile switch, ensuring a corresponding LED indication by wiring 4 status LEDs (each with a resistor to ground) to reflect system status.
- Add the IP5306 component and configure connections:
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Audio and Codec Integration
- Add the WM8960 codec and place it to maintain sufficient clearance from switching noise.
- Connect the codec’s I2S pins to the Pi’s I2S lines (GPIO18/19/20/21).
- Add the two PJ-320A jacks and wire them to the WM8960, ensuring proper audio signal routing.
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Haptics Integration
- Add the DRV2605L haptics driver and connect its output to an LRA pad.
- Connect the DRV2605L’s I2C lines to the Pi’s I2C (GPIO2/3) along with proper pull-ups.
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External Controller Integration
- Add the JST-SH 6-pin connector and assign its pins for VCC, GND, SDA, SCL, and additional GPIO (GPIO17 and GPIO27).
- Connect the I2C interface from the Pi to the JST-SH connector.
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Wiring and Layout Considerations
- Wire the IP5306, and other power components carefully to minimize loop inductance. Cluster the switching components (IP5306, inductor, and ceramics) together.
- Place USB-C, JST connectors, and audio jacks along the board edge as specified.
- Route all power traces with sufficient thickness to handle current demands and ensure proper grounding throughout the design.
- Verify that all connections are made to the designated Pi GPIO pins (I2C, I2S and 5V rail) based on the Raspberry Pi HAT template in context.
#Success criteria
- All major ICs (IP5306, WM8960, DRV2605L) and connectors (USB-C, JST-PH, PJ-320A, JST-SH) are correctly added, configured, and placed.
- The power subsystem maintains stable 5V output with a properly placed bulk capacitor and properly wired battery and charging circuits.
- Audio and I2S lines are insulated from switching noise and correctly routed.
- The I2C lines are properly pulled up and shared among WM8960, DRV2605L, and the JST-SH external controller.
- Placement constraints ensure that connectors are at the board edge and that high-speed/sensitive components are isolated as required.
- The design passes ERC/DRC checks and meets standard production-grade hardware requirements.
Pick USB-C approach
Select IP5306 variant
Size I2C pull-ups
Choose bulk capacitor
External port pinout
85 days
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