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HI-8428 Datasheet(PDF) 5 Page - Holt Integrated Circuits

Part # HI-8428
Description  MIL-STD-704 compliant
Download  16 Pages
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Manufacturer  HOLTIC [Holt Integrated Circuits]
Direct Link  http://www.holtic.com
Logo HOLTIC - Holt Integrated Circuits

HI-8428 Datasheet(HTML) 5 Page - Holt Integrated Circuits

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FUNCTIONAL DESCRIPTION (cont.)
HOLT INTEGRATED CIRCUITS
5
WETTING CURRENT
In Ground/Open mode a current of approximately 1mA is
sourced from the SENSE pin when it is grounded and VDD is
powered at 12.0V. The wetting current serves to provide
current through switches or relay contacts to prevent dry
contacts and improve switch contact reliability.
When programmed as Supply/Open sensors, CRn is set to a
logic 0. Referring to Figure 1,
Supply/Open thresholds are set at >12V for the supply state
and <6V for the open state, providing 3 - 6V of hysteresis /
noise rejection.
For the Supply/Open case the wetting current into the sense
input is simply the current sunk by the effective 30k
to
GND. For V
= 28V, I
is 1ma. See Figure 2.
SUPPLY/OPEN SENSING
WETTING CURRENT
Ω
SENSE
WET
a switch in series with a diode
is closed to provide a pull down to ground of 30k .
Ω
BUILT-IN TEST
Writing a high in Control Register bit CR9 puts the HI-8428
into the Built-In Test (BIT) mode.
Referring to Figure 1, when in the test mode each of the
internal inputs to the sense comparators are set to either a
high or low. Since the input sense pin is isolated by a
680k
resistor, this test mode will not disturb the actual
status of the input pin.
When in BIT mode, setting CRn high for a particular sensor
forces the comparator inputs high. A zero in CRn forces the
comparator input low. To verify correct comparator
behavior, the user must read from the Data Register and
compare with the value written to CR1-8.
Ω
NOTE:
but while still in BIT
mode
Certain flight applications require periodic sensor
testing during flight. To ensure seamless transition
between BIT mode and normal operation mode, the
following steps should be followed:
1) The host should read and record the Configuration
Register value for normal mode operation.
2) The host should read and record the last value of
the Data Register before enabling BIT mode
(CR9 = 1).
3) Following test completion,
, the host should set the sensor outputs to
their pre-test values by writing bits CR8 - CR1 with
their corresponding Data Register pre-test values
recorded in step 2) above.
4) Normal operation (CR9 = 0) is restored by writing
the Configuration Register with its pre-test value
stored in step 1).
HI-8428


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