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ASM706TEPA Datasheet(PDF) 6 Page - Alliance Semiconductor Corporation |
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ASM706TEPA Datasheet(HTML) 6 Page - Alliance Semiconductor Corporation |
6 / 16 page 6 of 16 Notice: The information in this document is subject to change without notice 3/3.3/4.0 V µP Supervisor Circuits ASM706 P/ R/ S/ T/ J ASM708 R/ S/ T/ J October 2003 rev 1.0 50ns (VCC = 4.5V), the watchdog timer will begin a 1.6 second countdown. Additional transitions at WDI will reset the watchdog timer and initiate a new countdown sequence. WDO will also become LOW and remain so, whenever the supply voltage, VCC, falls below the device threshold level. WDO goes HIGH as soon as VCC transitions above the threshold. There is no minimum pulse width for WDO as there is for the RESET outputs. If WDI is floated, WDO essentially acts as a low supply voltage output indicator. Power-failure Detection With Auxiliary Comparator All devices have an auxiliary comparator with 1.25V trip point. The output, PFO, is active LOW and the noninverting input is PFI. This comparator can be used as a supply voltage monitor with an external resistor voltage divider. As the monitored voltage level falls, PFI is reduced causing the PFO output to go LOW. Normally PFO interrupts the processor so the system can be shut down in a controlled manner. Application Information Bi-directional Reset Pin Interfacing The ASM706/8 can interface with µP/µC bi-directional reset pins by connecting a 4.7k Ω resistor in series with the RESET output and the µP/µC bi-directional reset pin. Ensuring the RESET is Valid Down to VCC = 0V When VCC falls below 1.2V, the ASM706R/S/T/J and 708R/S/ T/J RESET reset outputs no longer pull down; it becomes indeterminate. To avoid the possibility that stray charges could build up and force RESET to the wrong state, a pull- down resistor should be connected to the RESET pin, thus draining such charges to ground. The resistor value is not critical. A100k Ω resistor will pull RESET to ground without loading it. Figure 2: Watchdog timing 0V Supply Voltage BUF Buffered RESET VCC ASM70x GND GND RESET RESET Input µC or µP 4.7kΩ Bi-directional I/O Pin Figure 3: Bi-directional reset pin interfacing |
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