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MAX6442UT_S Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX6442UT_S Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 14 page Manual Reset Many microprocessor-based products require manual reset capability, allowing the operator, a test technician, or external logic circuitry to initiate a reset while the monitored supplies remain above their reset thresholds. These devices have a dedicated active-low MR pin. When MR is pulled low, RESET asserts a one-shot low pulse for the MR reset timeout period. The MR input has an internal 1.5k Ω pullup resistor to VCC and can be left unconnected if not used. MR can be driven with CMOS- logic levels, open-drain/open-collector outputs, or a momentary push-button switch to GND (the MR function is internally debounced for the tDEB timeout period) to create a manual reset function. If MR is driven from long cables, or if the device is used in a noisy environment, connect a 0.1µF capacitor from MR to GND to provide additional noise immunity (see Figure 4). Hysteresis Hysteresis increases the comparator’s noise margin by increasing the upper threshold or decreasing the lower threshold. The hysteresis prevents the output from oscillating (chattering) when VBATT is near the low-bat- tery threshold. This is especially important for applica- tions where the load on the battery creates significant fluctuations in battery voltages (see Figure 5). Applications Information Li+ Battery Charger Application The MAX6441/MAX6442 dual-output battery monitors can be used in conjunction with a battery charger to provide a system with additional information about the battery charge state. Many battery chargers, such as the MAX1879, provide the user with a CHG output, which tells the system when the battery is charged. The MAX6441/MAX6442 dual-output battery monitors pro- vide three outputs, which can be used to relay the bat- tery condition to the system. This information is useful in determining which system resources can be powered by the battery at the current charge state (see Figure 6). Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated µP Reset 10 ______________________________________________________________________________________ VBATT LBO tLBOP VHTH VLTH VHYST HTH = BATTERY VOLTAGE GOOD, ENABLE OPERATION. LTH = BATTERY VOLTAGE LOW, SUSPEND/DISABLE OPERATION. Figure 5. Hysteresis BATT GND 1-CELL Li+ BATTERY THERM ADJ GATE PULSE-WIDTH SELECT INPUT CHG LED THERMISTOR IN MAX1879 MAX6441 MAX6442 TSEL GND LBOL LBOLH RESET LBOH VBATT VCC CURRENT- LIMITED AC WALL ADAPTER IN OUT SHDN DC/DC CONVERTER Figure 6. Li+ Charger Application (Using MAX1879) DC/DC SHDN MR VBATT RESET MAX6441 MAX6442 NMI RESET µP VCC GND GND VCC Li+ 3.6V LBOL LBOH OUT IN Figure 7. DC-to-DC Converter Application |
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