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Jumper Functions
JUMPER
VLOGIC
VDD
XTAL VDD
EXTCLK
MASTER RESET
TXENB
EXTTHSOG
EXTTHSVO
J5
J11
TST0
TST1
AN‐8470, Rev. A
DEFAULT
ON
Link for VLOGIC supply to the LED
ON
Link for VDD supply current (this supplies the HI‐8470
converter for the ARINC 429 outputs)
ON
Supplies 3.3V to the 1MHz crystal oscillator
ON
To use external clock, disconnect link and apply Vlogic
level clock to the CLK test point
OFF
In place, this holds HI‐8470 in reset
ON
In place; push button 'TRANSMIT' is pressed to
transmit. For continuous transmit, remove the link.
ON
When not in place, the external GLO_SET and
GHI_SET potentiometers set the GND/Open
thresholds. With jumper in place, the device uses
internal thresholds.
ON
When not in place, the external VLO_SET and
VHI_SET potentiometers set the Supply/Open
thresholds. With jumper in place, the device uses
internal thresholds.
GND
Sensor input switch 0:7 source; GND when switches
are 'ON'. In non‐GND position, the voltage on the
VSENSE 0:7 test point is applied, for the switches in
'ON' position.
GND
Sensor input switch 8:15 source; GND when switches
are 'ON'. In non‐GND position, the voltage on the
VSENSE 8:15 test point is applied, for switches in the
'ON' position.
OFF
When in place, the sensor inputs are all set to Low,
and results in Highs at the sensor outputs.
OFF
When in place, the sensor inputs are all set to High,
and results in Lows at the sensor outputs. With TST1
and TST0 in place, sensor inputs are alternately 1,0
HOLT INTEGRATED CIRCUITS
4
DESCRIPTION
3/2/15
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