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ISL88705 Datasheet(PDF) 11 Page - Intersil Corporation |
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ISL88705 Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 15 page 11 FN8092.5 January 12, 2009 ISL88705EVAL1 and Applications The ISL88705EVAL1 supports all six of the ISL88705, ISL88706, ISL88707, ISL88708, ISL88716, ISL88813 devices, enabling evaluation of basic functional operation and common application implementations. Figures 15 and 17 illustrate the ISL88705EVAL1 in photographic and schematic forms respectively. The ISL88705EVAL1 is divided into two banks; each bank having one each of the three available pinouts. The top bank is fully populated and immediately usable whereas the bottom bank is unpopulated. Samples of other sample variants can be evaluated singularly or in combination with any other variant to provide a specific voltage monitoring solution. The left position has the ISL88705IB846Z monitoring the VDD rail voltage for a minimum of 4.64V with reset signaling. In addition, the power fail input (PFI) is being compared to the internal PFI voltage reference of 1.25V and the power fail output (PFO) will report the PFI condition. This feature can be used for monitoring an auxiliary voltage, providing an early warning of a brown-out or power failure or presence detection in a system. The middle position has the ISL88813IB846Z installed and is set-up as a 5V window detector with jumper J1 installed. The VDD monitors for UV and the PFI for OV via the R3, R4 divider. The PFO output is inverted and connected to the manual reset input (MR) via U4. Hence, a reset signal is generated when 4.64V < VDD > 5.38V. With J1 removed, the PFO will be an OV indicator but no reset signal will be generated. Both of these positions share a common Watchdog input (WDI) signal although each has its own Watchdog output (WDO). The right position has the ISL88707IB846Z and is set-up as a +12V and +5V UV monitor with reset signal. The PFI allows monitoring of any voltage above the 1.25V PFI reference and with a resistor divider this is used to monitor the 12V. The ISL88707 and ISL88708 have the unique feature of an adjustable time to reset (tPOR) signal generation capability via the CPOR pin with an external capacitor to GND. This evaluation platform has an adjustable SMD capacitor, C4 (8pF to 45pF) that allows easy evaluation of this feature. Also unique to the ISL88707 and ISL88708 are both the RESET and RESET outputs, all other variants having only one or the other. Figures 10, 11, 12, 13 and 14 illustrate the basic IC functions and performance of the 3 implementations. FIGURE 14. 5V OV/UV MONITORING Typical Performance Curves (Continued) RESET VDD 5.5V OV FIGURE 15. ISL88705EVAL1 ISL88705, ISL88706, ISL88707, ISL88708, ISL88716, ISL88813 |
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