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MAX6442UT_T Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX6442UT_T Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 14 page DC-to-DC Converter Application The MAX6441/MAX6442 triple-output battery monitors can be used in conjunction with a DC-to-DC converter to power microprocessor systems using a single Li+ cell or two to three alkaline/NiCd/NiMH cells. The LBOH output indicates that the battery voltage is weak, and is used to warn the microprocessor of potential problems. Armed with this information, the microprocessor can reduce system power consumption. The LBOL output indicates the battery is empty, and system power should be disabled. By connecting LBOL to the SHDN pin of the DC-to-DC converter, power to the microproces- sor is removed. Microprocessor power does not return until the battery has recharged to a voltage greater than VLTH+ (see Figure 7). Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated µP Reset ______________________________________________________________________________________ 11 UPPER THRESHOLD (HTH) VOLTAGES 3.3V 3.4V 3.5V 3.6V 2.6V AG AH AI AJ 2.7V BG BH BI BJ 2.8V CG CH CI CJ 2.9V DG DH DI DJ 3.0V EG EH EI EJ LOWER THRESHOLD (LTH) 3.1V FG FH FI FJ Table 1. Factory-Trimmed Lower and Upper Threshold Combinations for Single-Cell Li+ or Three-Cell Alkaline/NiCd/NiMH Applications UPPER THRESHOLD (HTH) VOLTAGES 2.3V 2.4V 2.5V 2.6V 1.6V KQ KR KS KT 1.7V LQ LR LS LT 1.8V MQ MR MS MT 1.9V NQ NR NS NT 2.0V OQ OR OS OT LOWER THRESHOLD (LTH) 2.1V PQ PR PS PT Table 2. Factory-Trimmed Lower and Upper Threshold Combinations for Two-Cell Alkaline/NiCd/NiMH Applications PART NO. SUFFIX ( _ ) VCC NOMINAL RESET THRESHOLD (V) T 3.075 S 2.925 R 2.625 Z 2.313 Y 2.188 W 1.665 V 1.575 Table 3. Factory-Trimmed VCC Reset Threshold Levels ACTIVE TIMEOUT PERIOD (ms) TIMEOUT PERIOD SUFFIX MIN MAX D3 150 300 D7 1200 2400 Table 4. VCC Reset Timeout Period Suffix Guide |
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