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MAX16038LLA44+T Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX16038LLA44+T Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 21 page Low-Power Battery Backup Circuits in Small µDFN Packages ______________________________________________________________________________________ 11 BATTON Indicator (MAX16035/MAX16039 Only) BATTON is a push-pull output that asserts high when in battery-backup mode. BATTON typically sinks 3.2mA at a 0.4V saturation voltage. In battery-backup mode, this terminal sources approximately 10µA from OUT. Use BATTON to indicate battery-switchover status or to supply base drive to an external pass transistor for higher current applications (see Figure 3). RESETIN Comparator (MAX16036/MAX16040 Only) An internal 1.235V reference sets the RESETIN thresh- old voltage. RESET asserts when the voltage at RESETIN is below 1.235V. Use the RESETIN function to monitor a secondary power supply. Use the following equations to set the reset threshold voltage (VRTH) of the secondary power supply (see Figure 4): VRTH = VREF (R1 / R2 + 1) where VREF = 1.235V. To simplify the resistor selection, choose a value for R2 and calculate R1. R1 = R2 [(VRTH / VREF) - 1] Since the input current at RESETIN is 25nA (max), large values (up to 1MΩ) can be used for R2 with no signifi- cant loss in accuracy. Power-Fail Comparator The MAX16033–MAX16040 issue an interrupt (nonmask- able or regular) to the µP when a power failure occurs. The power line is monitored by two external resistors con- nected to the power-fail input (PFI). When the voltage at PFI falls below 1.235V, the power-fail output (PFO) drives the processor’s NMI input low. An earlier power-fail warn- ing can be generated if the unregulated DC input of the regulator is available for monitoring. The MAX16033– MAX16040 turn off the power-fail comparator and force PFO low when VCC falls below the reset threshold volt- age (see Figure 1). The MAX160_ _L devices provide push-pull PFO outputs. The MAX160_ _P devices provide open-drain PFO outputs. 2.4V TO 5.5V CE (CEIN) ( ) FOR MAX16035 ONLY A0–A15 µP CMOS RAM BATTON VCC BATT (CEOUT) GND RESET OUT 0.1µF ADDRESS DECODE MAX16035 MAX16039 RESET Figure 3. MAX16035/MAX16039 BATTON Driving an External Pass Transistor MAX16036 MAX16040 R1 RESETIN VIN VCC R2 Figure 4. Setting RESETIN Voltage for the MAX16036/MAX16040 |
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