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ISL88011IH522Z-TK Datasheet(PDF) 7 Page - Intersil Corporation |
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ISL88011IH522Z-TK Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 12 page 7 FN8093.1 December 14, 2006 Principles of Operation The ISL88011 through ISL88015 devices provide those functions needed for critical voltage monitoring. These features include Power On Reset control, customizable supply voltage supervision, Watchdog Timer capability, and manual reset assertion. By integrating all of these features into a small 5 Ld SOT-23 package and using only 5.5µA of supply current, the ISL88011 through ISL88015 devices can assist in lowering system cost, reducing board space requirements, and increasing the reliability of a system. Low Voltage Monitoring During normal operation, these supervisors monitor both the voltage level of VDD (ISL88011, ISL88012, ISL88013) and/or VMON (ISL88012, ISL88014, ISL88015). The device asserts a reset if any of these voltages falls below their respective trip points. The reset signal effectively prevents the system from operating during a power failure or brownout condition. This reset signal remains asserted until VDD and the voltage on VMON exceed their voltage threshold setting for the reset time delay period tPOR of 200ms (See Figure 1). The ISL88012, ISL88014 and ISL88015 allow users to customize the minimum voltage sense level on the VMON input pin. To do this, connect an external resistor divider network to the VMON pin in order to set the trip point to some voltage above 600mV according to the following equation (See Figure 2): FIGURE 1. VOLTAGE MONITORING TIMING DIAGRAM VDD VMON MR RST tPOR VTHVDD 1V VTHVMON tPOR tPOR tPOR >tMR tRPD tRPD RST V INTRIP 0.6 R 1 R 2 + () R 2 --------------------------- × = (EQ. 1) ISL88012 VIN R1 R2 ISL88014 ISL88015 VMON FIGURE 2. USING VMON TO MONITOR VIN VIA RESISTORS ISL88011, ISL88012, ISL88013, ISL88014, ISL88015 |
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