ILC5140XCS Просмотр технического описания (PDF) - Impala Linear Corporation
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ILC5140XCS Datasheet PDF : 6 Pages
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CMOS Multilevel Voltage Detector
Advance
Detailed Descripton
Threshold Detect to Flag Enable
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-
ues; therefore Flag 1 is asserted at VTH1, Flag 2 is asserted
at a voltage VTH2 which is lower than VTH1 and so on. The
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
a PDA, where Flag 1 is asserted at VTH1 = 2.9V “LOW BAT-
TERY WARNING” flag; Flag 2 is asserted at VTH2 = 2.7V
“DISABLE CMOS WRITE”; Flag 3 is asserted at VTH3 = 2.5V
“DISABLE IrDA PORT” and Flag 4 is asserted at VTH4 = 2.3V
“DISABLE SYSTEM EXCEPT CHARGING.”
RESET AND RESET
The ILC514X has three output configurations: Open Drain
(ILC5140) RESET, Push Pull (ILC5141) RESET and Push
Pull (ILC5142) RESET
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.
Voltage Thrsholds for the Flags
Voltage Thresholds
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 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.
Impala Linear Corporation
ILC514x 1.1
(408) 574-3939 www.impalalinear.com
Dec 2000 5
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