10.4.4 Low Battery Detector Circuit—LBI/LBOThe low-battery detector circuit is typically used to supervise the battery voltage and to generate an error flagwhen the battery voltage drops below a user-set threshold voltage. The function is active only when the device isenabled. When the device is disabled, the LBO pin is high-impedance. The switching threshold is 500 mV at LBI.During normal operation, LBO stays at high impedance when the voltage, applied at LBI, is above the threshold.It is active low when the voltage at LBI goes below 500 mV.The battery voltage, at which the detection circuit switches, can be programmed with a resistive dividerconnected to the LBI pin. The resistive divider scales down the battery voltage to a voltage level of 500 mV,which is then compared to the LBI threshold voltage. The LBI pin has a built-in hysteresis of 10 mV. See theapplication section for more details about the programming of the LBI threshold. If the low-battery detectioncircuit is not used, the LBI pin should be connected to GND (or to VBAT) and the LBO pin can be leftunconnected. Do not let the LBI pin float.
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