View max6427-max6438 datasheet:

19-2323; Rev 0; 1/02 Low-Power, Single/Dual-Level Battery Monitors with Hysteresis General Description Features The MAX6427–MAX6438 are single/dual-level battery mon- Factory-Trimmed or User-Adjustable Threshold itors with internal hysteresis. These devices are offered with Options single (MAX6427/MAX6428/MAX6429, MAX6433/ Factory-Trimmed Low Thresholds from 1.6V to MAX6434/MAX6435) or dual (MAX6430/MAX6431/ 2.1V or 2.6V to 3.1V in 100mV Increments MAX6432, MAX6436/MAX6437/MAX6438) low-battery out- (MAX6427–MAX6432) put indicators, which can be used to indicate three battery Factory-Trimmed High Thresholds from 2.3V to conditions: battery is good (operate system in normal 2.6V or 3.3V to 3.6V in 100mV Increments mode), battery is weak (operate system in low-power (MAX642