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AN4324 Datasheet(PDF) 11 Page - STMicroelectronics |
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AN4324 Datasheet(HTML) 11 Page - STMicroelectronics |
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11 / 31 page  AN4324 Schematic guidelines DocID024963 Rev 2.0 11/31 4.1.4 Sense resistor deviation over temperature range (TCR) The sense resistor impedance value depends on ambient temperature. The generated error from temperature deviation has to be limited in order to ensure that the impact of temperature on current measurement accuracy is minimized. A 0.3 % impedance value deviation at maximum temperature deviation is acceptable as it does not impact the current measurement accuracy over the temperature range too much. Example for a 75 ppm TCR sense of 10 mΩ, with a 40 °C maximum temperature deviation from typical temperature: MaxError: ((TCR x Rsense x d) / Rsense) x 100 = ((0.000075 x 0.01 x 40) / 0.01) x 100 = 0.3 % Where d = temperature in ˚C. 4.1.5 Sense resistor selection proposal Table 4: Proposed sense resistor references Product reference Manufacturer Impedance Accuracy Power dissipation Sense resistor deviation over temperature range (TCR) Package ERJM03NF10MV PANASONIC 10 mΩ ±1 % 250 mW ±100 ppm/°C 0603 WSL0603R0100FEA VISHAY DALE ±1 % 100 mW ±75 ppm/°C 4.2 BatD pin system integration The BatD pin detects battery removal events: either the third battery pin is an ID pin or a thermal information pin. The following three situations describe several application cases where the battery is removed and how the STC3115 detects such an event: 1. Battery is removed during a low consumption stage: At this time, the application consumption is low and the Vbat voltage can take time to decrease (application capacitor discharging period). At the same time, the third battery pin is disconnected and the BatD pin voltage is fixed by the pull-up voltage value. Battery removal is detected rapidly by the BatD feature. 2. Battery is removed during a high consumption stage: At this time the application consumption is high and the Vbat voltage decreases rapidly. The STC3115 detects battery removal and in this case the BatD pin is not used. 3. Battery is removed if the charger is already connected: At this time, Vbat voltage maintains the same value or increases slightly. The BatD pin is used to detect battery removal as the battery voltage information cannot be used. During battery removal, the BatD pull-up voltage should be ON and higher than 1.61 V internal threshold. For most applications, the pull-up voltage should always be available and above the threshold. The best voltage to use is the Vbat voltage itself. |
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