ASM802L

The ASM690A / ASM692A / ASM802L / ASM802M / ASM805L offers complete single chip solutions for power supply monitoring and control battery functions in microprocessor systems. Each device implements four functions: Reset control,watchdog monitoring, battery-backup switching and powerfailure monitoring. In addition to microprocessor reset under power-up and power-down conditions, ASM802L provide battery-backup switching to maintain control in power loss and brown-out situations. Additional monitoring capabilities can provide an early warning of unregulated power supply loss before the voltage regulator drops out. The important features of these four functions of ASM802L are:

• 1.6 second watchdog timer to keep microprocessor responsive
• 4.40V or 4.65V VCC threshold for microprocessor reset at power-up and power-down
• SPDT (Single-pole, Double-throw) PMOS switch connects backup power to RAM if VCC fails
• 1.25V threshold detector for power loss or general purpose voltage monitoring

These features are pin-compatible with the industry standard
power-supply supervisors. Short-circuit and thermal protection
have also been added. The ASM690A / ASM802L / ASM805L
generate a reset pulse when the supply voltage drops below
4.65V and the ASM692A / ASM802M generate a reset below
4.40V. The ASM802L / ASM802M have power-fail accuracy to
± 2%. The ASM805L is the same as the ASM690A except that
RESET is provided instead of RESET.