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ASM690ACSA Datasheet(PDF) 5 Page - PulseCore Semiconductor |
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ASM690ACSA Datasheet(HTML) 5 Page - PulseCore Semiconductor |
5 / 15 page ASM690A/692A ASM802L/802M April 2008 ASM805L rev 1.7 µP Power Supply Supervisor With Battery Backup Switch 5 of 15 Notice: The information in this document is subject to change without notice. Table 2: Maximum Battery Voltages Part Number MAXIMUM Battery Voltage (V) ASM690A 4.80 ASM802L 4.80 ASM805L 4.80 ASM692A 4.55 ASM802M 4.55 Although most batteries that meet the requirements of Table2 are acceptable, lithium batteries are very effective backup source due to their high-energy density and very low selfdischarge rates. Battery replacement while Powered Batteries can be replaced even when the device is in a powered state as long as VCC remains above the reset threshold voltage VRT. In the ASM devices, a floating VBATT pin will not cause a powersupply switchover as can occur in some other supervisory circuits. If VBATT is not used, the pin should be grounded. Backup Power Sources - SuperCap™ Capacitor storage, with very high values of capacitance, can be used as a back-up power source instead of batteries. SuperCap™ are capacitors with capacities in the fractional farad range. A 0.1 farad SuperCap™ would provide a useful backup power source. Like the battery supply, it is important that the capacitor voltage remain below the maximum voltages shown in Table 2. Although the circuit of Figure 4 shows the most simple way to connect the SuperCap™, this circuit cannot insure that an over voltage condition will not occur since the capacitor will ultimately charge up to VCC. To insure that an over voltage condition does not occur, the circuit of Figure 5 is preferred. In this circuit configuration, the diode-resistor pair clamps the capacitor voltage at one diode drop below VCC. VCC itself should be regulated within ±5% of 5V for the ASM692A/802M or within ±10% of 5V for the ASM690A/802L/805L to insure that the storage capacitor does not achieve an over voltage state. Note: SuperCapTM is a trademark of Baknor Industries Operation without a Backup Power Source When operating without a back-up power source, the VBATT pin should be connected to GND and VOUT should be connected to VCC, since power source switchover will not occur. Connecting VOUT to VCC eliminates the voltage drop due to the ON-resistance of the PMOS switch. |
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