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

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

ISL88011, ISL88012 and ISL88013 will release the reset once

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,

VMON inputs must be met before reset is released.

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.

can be increased from the nominal 250ms by connecting a

between the two as the ISL88014 has a 22pF capacitor on its

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

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).

layout as much as possible in order to minimize its effect on

FIGURE 10. OVER/UNDERVOLTAGE MONITOR

3.3V

50K

ISL8801X-31

10K

ISL88014 /ISL88015

RST

VMON

RST

3.3V

100K

VOLTAGE OUT OF RANGE = PGOOD LOW

3.3V

100K

PGOOD

ISL88011, ISL88012, ISL88013, ISL88014, ISL88015