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MAX6887-ETE Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX6887-ETE Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 14 page existing state while system-level testing occurs. Leave MARGIN unconnected or connect to BP if unused. An internal 10µA current source pulls MARGIN to BP. MARGIN overrides MR if both are asserted at the same time. The state of RESET, OV, and WDO does not change while MARGIN = GND. RESET, OV, and WDO Outputs The MAX6887/MAX6888 feature three active-low open- drain outputs: RESET, OV, and WDO. After power-up or overvoltage/undervoltage conditions, RESET and OV remain in their active states until their timeout periods expire and no undervoltage/overvoltage conditions are present (see Figure 2). OV asserts when any monitored input is above its over- voltage threshold and remains asserted until all inputs are below their thresholds and its respective 25µs time- out period expires. Connect OV to MR to bring RESET low during an overvoltage condition. OV requires a pullup resistor (unless connected to MR). RESET asserts when any monitored input is below its undervoltage threshold or MR is asserted. RESET remains asserted for 200ms after all assertion-causing conditions have been cleared. Configure RESET to assert when the watchdog timer expires by connecting WDO to MR. RESET requires a pullup resistor. WDO asserts when the watchdog timer expires. See the Configuring the Watchdog Timer section for a com- plete description. WDO requires a pullup resistor. Configuring the Watchdog Timer A watchdog timer monitors microprocessor (µP) soft- ware execution for a stalled condition and resets the µP if it stalls. Connect the watchdog timer output WDO to the reset input or a nonmaskable interrupt of the µP. The watchdog timer features independent initial and normal watchdog timeout periods of 102.4s and 1.6s, respectively. Hex/Quad, Power-Supply Supervisory Circuits _______________________________________________________________________________________ 9 Table 2. MAX6888 Threshold Options UV THRESHOLDS (V) OV THRESHOLDS (V) PART IN1 IN2 IN3 IN4 IN1 IN2 IN3 IN4 MAX6888AETE 4.620 3.060 2.310 1.670 5.360 3.540 2.680 1.930 MAX6888BETE 4.620 3.060 2.310 0.557 5.360 3.540 2.680 0.643 MAX6888CETE 4.620 3.060 1.670 0.557 5.360 3.540 1.930 0.643 MAX6888DETE 3.060 2.310 1.670 1.390 3.540 2.680 1.930 1.610 MAX6888EETE 3.060 2.310 1.670 0.557 3.540 2.680 1.930 0.643 MAX6888FETE 3.060 2.310 1.390 0.557 3.540 2.680 1.610 0.643 MAX6888GETE 3.060 2.310 0.557 0.557 3.540 2.680 0.643 0.643 MAX6888HETE 3.060 1.670 0.557 0.557 3.540 1.930 0.643 0.643 MAX6888QETE 0.527 0.527 0.527 0.527 0.673 0.673 0.673 0.673 MAX6888IETE 4.380 2.880 2.190 1.580 5.620 3.700 2.810 2.020 MAX6888JETE 4.380 2.880 2.190 0.527 5.620 3.700 2.810 0.673 MAX6888KETE 4.380 2.880 1.580 0.527 5.620 3.700 2.020 0.673 MAX6888LETE 2.880 2.190 1.580 1.310 3.700 2.810 2.020 1.680 MAX6888METE 2.880 2.190 1.580 0.527 3.700 2.810 2.020 0.673 MAX6888NETE 2.880 2.190 1.310 0.527 3.700 2.810 1.680 0.673 MAX6888OETE 2.880 2.190 0.527 0.527 3.700 2.810 0.673 0.673 MAX6888PETE 2.880 1.580 0.527 0.527 3.700 2.020 0.673 0.673 MAX6888RETE 0.557 0.557 0.557 0.557 0.643 0.643 0.643 0.643 |
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