tonylin / IoT Smartwatch

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1.62 to 5.5V
tonylin

tonylin

1.62 to 5.5V
1y
4
Vled: 3.3V
tonylin

tonylin

Vdd: 1.8V
1y
tonylin

tonylin

Vled: 3.3V
1y
3
verify battery charging circuit and recommend any needed changes, how would i wi...
tonylin

tonylin

@copilot verify battery charging circuit and recommend any needed changes, how would i wire the battery to power the peripherals? also integrate the battery boost tps61221 to power the oled display
1y

copilot

To verify your battery charging circuit and integrate the TPS61221 boost converter for powering the OLED display, we'll first review the critical components and nets related to charging and power distribution. Your project includes the BQ24095DGQR for charging management and a TPS61221DCKR boost converter to elevate the battery voltage for peripherals requiring higher voltages.
Battery Charging Circuit Review
  • Battery Charging IC (IC3 - BQ24095DGQR): Connected to the battery (BT1), USB port (J1), and various passive components (R9, R10, D1) for charging control.
  • Battery (BT1 - VL-2330_HFN): Connected via net 18d31f0397240630c649f04d09580c08 for charging and net a4496bdc8124362bce8f45f6cb920116 for grounding.
  • Charge Status & Power Good (D1 & IC3’s ~PG pin): D1 connected to IC3's ~PG pin indicates charging status.
Recommendations & Integration Steps
  1. Ensure Proper Feedback Network for BQ24095DGQR: The BQ24095DGQR should have a proper feedback network, including ISET to adjust charge current and PRETERM to set the charge termination threshold. Check:
    • Connect R9 between J1:VBUS and IC3:IN for input supply. Already connected via Net 18d31f0397240630c649f04d09580c08.
    • Ensure R10 between BT1:(+) and IC3:OUT sets the charge current suitably. Already connected via 18d31f0397240630c649f04d09580c08.
    • Make sure R8 is properly setting the PRETERM charge termination condition via Net 48ebe8ea3929186fec02b93205705eff.
  2. Integrating TPS61221DCKR Boost Converter:
    • Input (VIN) Connection: Connect U2:VIN to BT1:(+), allowing the battery to directly supply the TPS61221. Since the VL-2330 is a lithium coin cell, ensuring its voltage matches the TPS61221's recommended operating range is essential.
    • Output (VOUT) Connection: Connect U2:VOUT directly to the OLED1:(5V), providing it with the boosted voltage.
    • Ground Connection: Ensure U2:GND is connected to the system ground, which looks to be managed via the various GND nets. Based on your schematic, ensuring a single connected ground network between BT1:(-), IC3:VSS_1, IC3:VSS_2, and U2:GND is necessary.
    • Feedback and Enable Pins: The feedback (FB) pin of U2 naturally connects to an internal voltage divider. You don't need to connect it externally unless you're adjusting the output voltage away from the default. For simplicity, leaving FB as is should be fine. Connect U2:EN to a GPIO on IC1 if you want software control over the boost converter or tie it to VIN for always-on operation.
    • Inductor and Capacitor: The TPS61221 requires an external inductor connected to U2:L and capacitors on both input and output for stable operation. Often, a value around 2.2µH for the inductor and 10µF for both input and output capacitors is a good start, adjusted based on your specific requirements and the TPS61221 datasheet recommendations.
Example Connections for TPS61221 Integration
  • Connect U2:VIN to BT1:+.
  • Connect U2:GND to BT1:-, IC3:VSS_1, and IC3:VSS_2.
  • Connect U2:VOUT to OLED1:5V.
  • Optional: Connect U2:EN to IC1 GPIO (for software control) or directly to BT1:+ for always-on.
Conclusion
Your charging circuit appears correctly configured for the BQ24095DGQR functionalities, with charging indication provided by D1 and proper feedback set by resistors. Integrating the TPS61221 requires direct connections to the battery for input and to the OLED for output, respecting ground coherence across the system. Ensure the TPS61221's peripheral components (inductors and capacitors) are chosen in line with Texas Instruments' datasheet to ensure stable operation.
1y
5
3.3V
C12
Capacitance
0.1µF
SCL-IO22
SCL-IO22
3.3V
U2
IC2
C5
Capacitance
0.1µF
C3
Capacitance
10µF
R6
Resistance
1kΩ
1.8V
3.3V
FB-VOUT
SDA-IO21
1.8V
R5
Resistance
1kΩ
C4
Capacitance
10µF
C6
Capacitance
4.7µF
1.8V
C13
Capacitance
0.1µF
5V
SDA-IO21
VIN-EN
5V
1.8V
C8
Capacitance
0.1µF
U1
IC4
U3

Reviews

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    jharwinbarrozo
    1.5M
  • Generic Capacitor
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    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, 10000uF 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, 220pF, 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
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  • Generic Inductor
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IoT Smartwatch

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