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ISL88013IH529Z Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL88013IH529Z Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 11 page 9 FN8093.0 February 13, 2006 Applications: Using the ISL8801XEVAL1 Platform The ISL8801XEVAL1 board is designed to provide both immediate functional assessment and flexibility to the user when evaluating any of the ISL88011 - ISL88015 variants (illustrated in Figure 11). It consists of two identical banks which each contain the five different pinouts available in this product family. The top bank comes populated for immediate assessment of functionality and performance. It is populated on the top row with the VTHVDD = 4.38V variants of the ISL88011, ISL88012 and ISL88013. The bottom row is populated with the ISL88014 and ISL88015, which monitor positive voltages >0.6V on the VMON input pin. The bottom bank is left unpopulated to allow other part options of the ISL88011, ISL88012 and ISL88013 to be evaluated with a minimal number of passive components to add. The RST/MR pull-up resistors are included as well as the ISL88014 and ISL88015 since these ICs have no voltage variants. During power-up, the ISL88011 - ISL88015 supervisors will assert reset once VDD reaches at least 1V. Thereafter, the ISL88011, ISL88012 and ISL88013 will release the reset once the VDD supply stays above 4.38V for the nominal tPOR period. The ISL88012, ISL88014 and ISL88015’s VMON input pins are biased to trip at 10.7V, 1.93V and 1.2V respectively. Note that because the ISL88012 is a dual voltage supervisor, both of the respective minimum thresholds for the VDD and VMON inputs must be met before reset is released. All of the parts have the TwinPinTM RST/MR, which combines the active-low reset output with a manual reset input. The push-button can be tested by simply driving this to <100mV above ground for at least 1µs. For the ISL88011 and ISL88014, the POR timeout delay tPOR can be increased from the nominal 250ms by connecting a capacitor to the CPOR pin. A comparison can be made between the two as the ISL88014 has a 22pF capacitor on its CPOR pin while the ISL88011 CPOR is left open. The ISL88013 and ISL88015 have a WDI input pin, which is connects to a microprocessor or microcontroller. This input needs to be periodically toggled within 1sec to prevent the supervisor from asserting reset. The WDI test point on the ISL8801XEVAL1 board provides easy access to this input. Multiple IC configurations as shown in Figures 6 through 10 are easy to evaluate with this platform as each bank is isolated from the other, thereby making VDD voltages and GND references indepedent of each other. SPECIAL CONSIDERATIONS: Using good decoupling practices will prevent transients from causing unwanted resets (i.e. due to switching noises and short duration droops in the supply voltage). When using the CPOR pin, avoid stray capacitance during layout as much as possible in order to minimize its effect on the tPOR timing. FIGURE 10. OVER/UNDERVOLTAGE MONITOR Typical Application Circuits (Continued) 3.3V VTHL @ 3.09V 50K ISL8801X-31 VTHH @ 3.6V 10K ISL88014 /ISL88015 VDD RST VMON VDD RST 3.3V 100K VOLTAGE OUT OF RANGE = PGOOD LOW 3.3V 100K PGOOD ISL88011, ISL88012, ISL88013, ISL88014, ISL88015 |
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