Design the current-based TS network for the BQ25170 to support the following charging requirements for a personal electronics application:

Suspend charging when the battery NTC is above 60°C or below -10°C. Use vendor R-T curve data for a 10kΩ, β(25/85°C)=3435K NTC.

1. Identify the required battery temperature thresholds.

   • T_HOT = 60°C

   • T_COLD = -10°C

2. Find the TS voltage thresholds from the BQ25170 datasheet.

   • V_HOT = 0.188V

   • V_COLD = 1.04V

3. Determine the resistance of the NTC at T_HOT and T_COLD.

   From a vendor R-T table:

   • R_HOT = 3.02kΩ

   • R_COLD = 42.47kΩ

4. Calculate the required series and parallel resistors.

   From the BQ25170 datasheet:

   • I_BIAS = 38µA

   • V_HOT = 0.188V

   • V_COLD = 1.04V

   Calculating the series resistor using Equation 2:

   • R_S,1 = 2,301Ω

   • R_S,2 = -47,791Ω

   Calculating the parallel resistor, R_P, using the valid solution, R_S,1, and Equation 3:

   • R_P = 70,409Ω

   Selecting standard E96 series (1% tolerance) resistor values from the calculated values:

   • R_S = 2.32kΩ

   • R_P = 69.8kΩ

5. Verifying the TS thresholds that result from these resistor values using Equation 4:

   • V_{TS, HOT} = 38µA (69.8kΩ || (2.32kΩ + 3.02kΩ)) = 0.188V

   • V_{TS, COLD} = 38µA (69.8kΩ || (2.32kΩ + 42.47kΩ)) = 1.04V

   These thresholds align with the COLD and HOT thresholds of the BQ25170 listed in step 2.