The ILC514X is designed to monitor the terminal voltage of a

power source such as a battery and to assert a flag depend-

ing on the internally set threshold voltages. Up to four flags

can be used to warn of declining stages of a battery’s life.

The flags are arranged in order of decreasing threshold val-

ILC514C is ideally suited for systems such as PDA’s, note-

books and personal electronics where multiple warning and

resets are desirable. An example of such a requirement is in

“DISABLE SYSTEM EXCEPT CHARGING.”

The ILC514X has three output configurations: Open Drain

(ILC5140) RESET, Push Pull (ILC5141) RESET and Push

Pull (ILC5142) RESET

The ILC5140 series will be offered in a variety of voltage

thresholds corresponding to industry standard requirements.

In addition, customer defined voltage thresholds are avail-

able on a special ordering basis.

Please consult Impala

marketing for conditions surrounding custom thresholds.

The ILC5140 samples the input voltage once every 400 ms.

This sampling rate was chosen to conserve battery life and

at the same time keep a reasonble vigil on the terminal volt-

age level. Once the thrshold has been passed, the flag

enable function reacts within 30µs.

In addition to the 400ms sampling, a sample and hold cir-

cuit compares the input voltage to the most recent sample

and if there is a DV greater than 20mV the input sampling

is turned on continuously until either a flag is asserted or the

threshold is regained. If, during the continuous sampling a

thrshold is crossed, the flag is enabled. This method inher-

ently prevents accidental tripping of the flag during minor

input voltage level glitches.

Once the threshold is crossed on an increasing voltage

level, the flag is disabled 140ms after such a threshold is

detected. This is a minimum time since an addtional 400ms

may be added if the threshold is not detected at the begin-

ning of a regular sampling.

The flags are labelled Flag 1, Flag 2, Flag 3, Flag 4.

Voltage thrsholds are arranged in order of decreasing volt-

age levels, therefore Flag 1 will have a higher threshold

than Flag 2 and so on.

CMOS Multilevel Voltage Detector

Impala Linear Corporation

5

(408) 574-3939

www.impalalinear.com

Dec 2000

ILC514x 1.1

Detailed Descripton

Threshold Detect to Flag Enable

Voltage Thresholds

Voltage Thrsholds for the Flags

Advance