CONSONANCE Figure 6 Combining 2 Input Power Supply Battery Temperature Sense To prevent the damage caused by the very high or very low temperature done to the battery pack, the CN3165 continuously senses battery pack temperature by measuring the voltage at TEMP pin determined by the voltage divider circuit and the battery’s internal NTC thermistor as shown in Figure 7. The CN3165 compares the voltage at TEMP pin (VTEMP) against its internal VLOW and VHIGH thresholds to determine if charging is allowed. In CN3165, VLOW is fixed at (45%×VIN), while VHIGH is fixed at (80%× VIN). If VTEMP<VLOW or VTEMP>VHIGH, it indicates that the battery temperature is too high or too low and the charge cycle is suspended. When VTEMP is between VLOW and VHIGH, the charge cycle resumes. The battery temperature sense function can be disabled by connecting TEMP pin to GND. Figure 7 Monitoring Battery Temperature www.consonance-elec.com 9 REV 1.0
