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ASM690 Datasheet(PDF) 2 Page - Alliance Semiconductor Corporation |
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ASM690 Datasheet(HTML) 2 Page - Alliance Semiconductor Corporation |
2 / 13 page 2 of 13 Notice: The information in this document is subject to change without notice ASM690A / 692A ASM802L / 802M ASM805L µP Power Supply Supervisor With Battery Backup Switch rev 1.0 October 2003 Pin Configuration 1 2 3 4 5 6 7 8 VOUT VCC GND PFI VBATT RESET (RESET) WDI PFO Plastic/CerDip/SO ASM690A ASM692A ASM802L ASM802M (ASM805L) Pin Description Pin Number Name Function ASM690A / ASM692A ASM802L / ASM802M ASM805L 11 VOUT Voltage supply for RAM. When VCC is above the reset threshold, VOUT connects to VCC through a P-Channel MOS device. If VCC falls below the reset threshold, this output will be connected to the backup supply at VBATT (or VCC, whichever is higher) through the MOS switch to provide continuous power to the CMOS RAM. 22 VCC +5V power supply input. 3 3 GND Ground 44 PFI Power failure monitor input. PFI is connected to the internal power fail comparator which is referenced to 1.25V. The power fail output (PFO) is active LOW but remains HIGH if PFI is above 1.25V. If this feature is unused, the PFI pin should be connected to GND or VOUT. 55 PFO Power-fail output. PFO is active LOW whenever the PFI pin is less than 1.25V. 66 WDI Watchdog input. The WDI input monitors microprocessor activity. An internal timer is reset with each transition of the WDI input. If the WDI is held HIGH or LOW for longer than the watchdog timeout period, typically 1.6 seconds, RESET (or RESET) is asserted for the reset pulse width time, tRS, of 140ms, minimum. 7 - RESET Active-LOW reset output. When triggered by VCC falling below the reset threshold or by watchdog timer timeout, RESET (or RESET) pulses low for the reset pulse width tRS, typically 200ms. It will remain low if VCC is below the reset threshold (4.65V in ASM690A / ASM802L and 4.4V in the ASM692A / ASM802L) and remains low for 200ms after VCC rises above the reset threshold. - 7 RESET Active-HIGH reset output. The inverse of RESET. 88 VBATT Auxiliary power or backup-battery input. VBATT should be connected to GND if the function is not used. The input has about 40mV of hysteresis to prevent rapid tog- gling between VCC and VBATT. |
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