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The RT9427R Li-Ion/Li-Polymer battery fuel gauge is a microcontroller peripheral that provides fuel gauging for single-cell battery packs. The RT9427R resides within the system's main board and manages a non-removable battery or removable battery pack.<br /><br />The RT9427R reports StateOfCharge, StateOfHealth, FullChargeCapacity, TimeToEmpty and CycleCount based on the Voltaic Gauge with Current Sensing (VGCS) algorithm by using the voltage difference between battery voltage and OCV to calculate the increasing or decreasing SOC, with current sensing compensation to report battery SOC.<br /><br />Voltaic Gauge with Current Sensing algorithm can support smoothly SOC and does not accumulate error with time and current. That is an advantage compared to coulomb counter which suffer from SOC drift caused by current sense error and battery self-discharge.<br /><br />The RT9427R provides complete battery status monitor with interrupt alarm function. It can alert to host processor actively when condition of battery over/undervoltage, over-temperature in charge/ discharge and overcurrent in charge/discharge. Especially for high C-rate battery charging application, it can measure battery voltage by kelvin sense connection to eliminate the IR drop effect for optimal charging profile and safety. More useful alarm functions are Under SOC alert, SOC Change and battery presence status change.<br /><br />The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 85°C.
RT9427R Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Support System Side Fuel Gauging </li><li>Battery Fuel Gauge for 1-Series (1sXp) Li-Ion/Li-Polymer Applications </li><li>State of Charge (SOC) Calculated by VoltaicGauge<sup>TM</sup> with Current Sensing (VGCS) </li><li>No Accumulation Error on Capacity Calculation </li><li>Battery SOC, SOH, FCC, TTE and Cycle Count Report </li><li>Ultra Low Power Consumption 5μA </li><li>Voltage Measurement: ±5mV </li><li>Current Measurement: ±1% </li><li>Battery Temperature Measurement: ±1°C </li><li>Battery monitor with alert indicator for Voltage, Current, Temperature, SOC and Presence </li><li>High C-Rate Battery Charging Compliance </li><li>Voltage Kelvin-Sense Connection </li><li>Build-In 8mΩ Sense Resistor </li><li>9 Bump WL-CSP Package with 0.5mm Pitch </li><li>I<sup>2</sup>C Controlled Interface with 1.2V and 1.8V IO Compatible </li></ul></div>
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RT9427R Ordering Information
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<div class="spec-list"><ul class="lv1"><li>Wearable Device </li><li>Handheld and Portable Applications </li><li>Digital Still Cameras </li><li>Digital Video Cameras </li></ul></div>
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