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MAX6846 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX6846 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated µP Reset _______________________________________________________________________________________ 7 5% HYST LTH DETECT VTH DETECT 5% HYST HTH DETECT VDD LTHIN HTHIN VCC 615mV LBO TIMEOUT PERIOD RESET TIMEOUT PERIOD LBOL LBOH RESET MAX6848 1.23V Figure 1b. MAX6848 Functional Diagram MAX6847 LTH DETECT HTH DETECT R S Q LBO TIMEOUT PERIOD RESET TIMEOUT PERIOD VTH DETECT VCC VCC VDD LTHIN HTHIN LBO RESET VCC 615mV Q MR 1.23V Figure 1a. MAX6847 Functional Diagram Low-Battery Output The low-battery outputs are available in active-low (LBO, LBOL, LBOH), open-drain configurations. The low-battery outputs can be pulled to a voltage indepen- dent of VCC or VDD, up to 5.5V. This allows the device to monitor and operate from direct battery voltage while interfacing to higher voltage microprocessors. The MAX6846/MAX6847 single-output voltage monitors provide a single low-battery output, LBO. LBO asserts when LTHIN drops below VLTH and remains asserted for at least 150ms after HTHIN rises above VHTH (see Figure 2). The MAX6848/MAX6849 dual-output voltage monitors provide two low-battery outputs: LBOH and LBOL. LBOH asserts when HTHIN drops below VHTH- and remains asserted for at least 150ms after HTHIN rises above VHTH+. LBOL asserts when LTHIN drops below VLTH- and remains asserted for at least 150ms after LTHIN rises above VLTH+ (see Figure 3). For fast- rising VDD input, the LBOL timeout period must com- plete before the LBOH timeout period begins. Reset Output The MAX6846–MAX6849 provide an active-low reset output (RESET). RESET is asserted when the voltage at VCC falls below the reset threshold level. Reset remains asserted for the reset timeout period after VCC exceeds the threshold. If VCC goes below the reset threshold before the reset timeout period is completed, the inter- nal timer restarts (see Figure 4). The MAX6846/ MAX6848 have open-drain reset outputs, while the MAX6847/MAX6849 have push-pull reset outputs. |
Similar Part No. - MAX6846_05 |
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