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1. ~CHG (Pin 8): This typically functions as an open-drain output to indicate the charging status.
2. ~PG (Pin 5): This is an open-drain power-good status indicator.
3. TS (Pin 9): This is typically used for temperature sensing of the battery and may require a pull-down or pull-up resistor depending on the specific application.

1. Review ~CHG:
   • Typically, you should connect a pull-up resistor to the ~CHG pin if you're using it as a status indicator.
   • Action: Consider adding a pull-up resistor from $\sim CHG$ to your desired logic level voltage (usually VCC).
2. Review ~PG:
   • Similar to ~CHG, this pin generally requires a pull-up resistor to indicate power-good status.
   • Action: Consider adding a pull-up resistor from $\sim PG$ to your desired logic level voltage.
3. Review TS:
   • Check the specific temperature sensing implementation. It may require a bias with pull-up or pull-down resistors.
   • Action: Determine if a pull-down or pull-up is required for $TS$ based on your application needs.
4. Other Pins:
   • None of the other pins listed (ISET2, VSS, ISET, EP, IN, PRETERM, OUT) typically require pull-up or pull-down resistors for reset/enable purposes directly, but always check the specific application notes for detailed setup.

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• Temperature Sensing (TS): This pin is used to connect an external thermistor, which is often placed in close proximity to the battery cell. The thermistor allows the battery charger IC to monitor the temperature of the battery during charging. By measuring the resistance of the thermistor, which changes with temperature, the IC can protect the battery from charging under unsafe temperature conditions. It helps in implementing temperature-qualified charging, ensuring that the battery is neither too cold ((T<0^{\circ}\text{C})) nor too hot ((T>45^{\circ}\text{C})) during the charging process, which is critical for maintaining battery health and safety.

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• NTC Thermistor: Choose a thermistor with a resistance value suited for your battery's temperature range. The BQ24090DGQR datasheet might suggest a specific type or resistance value.
• Resistor (Optional): Depending on your design, you might need a pull-up or series resistor. Check the datasheet for recommendations.

1. Identify the NTC Thermistor Value: Check the BQ24090DGQR datasheet for the recommended thermistor characteristics. If it's not specified, a common choice is a 10kΩ NTC thermistor at 25°C.
2. Connect the Thermistor to TS Pin:
   • Connect one end of the NTC thermistor to the TS pin (P9:TS).
3. Connect the Other End of the Thermistor to Ground (VSS Pin):
   • Connect the other end of the NTC thermistor to ground. This can be done by connecting it to the VSS pin of the BQ24090DGQR (P3:VSS).
4. Review Connection: Ensure that the thermistor is correctly placed near the battery to accurately measure its surface temperature. Do not place the thermistor too close to heat-generating components, as this could lead to inaccurate temperature readings.
5. Configuration and Testing: Once connected, you may need to configure the BQ24090DGQR settings through your circuit (if applicable) to correctly utilize the temperature sensing feature. Test the setup under various temperature conditions to ensure accurate operation.

• Connect TS (P9:TS) to one end of the NTC thermistor.
• Connect the other end of the NTC thermistor to Ground (P3:VSS).

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1. Connect TS Pin Directly to Ground: This is a common practice for ensuring that the unused TS pin does not float, which could potentially cause unpredictable behavior. Grounding it signals to the device that temperature monitoring should be bypassed or considered always within an acceptable range. However, always verify this approach against the specific device datasheet, as direct grounding might not always be recommended.
2. Leave the TS Pin Unconnected (No Connection): In some cases, if the chip is designed to ignore the TS pin function when it's not connected (floating), you might leave it unconnected. This approach is less common because floating pins can sometimes pick up noise, leading to potential issues.

• Connect TS (P9:TS) directly to Ground (VSS) if grounding is recommended for unused TS pins according to the datasheet. This would involve:
  • Connect TS (P9:TS) to Ground (P3:VSS).
• Leave the TS pin unconnected if the datasheet suggests that this is an acceptable practice for deactivating or bypassing the temperature sensing function.