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LED Functions
REF
LED1
LED2
Link Jumper Functions
REF
J4
J5
J8
J12
Wired Jumper Functions (JP)
REF
JP1
JP8
JP2, 3, 4, 5
JP6, 7, 9, 10
JP11
JP12
JP13‐16
AN‐1590, Rev. New
NAME
DEFAULT
POWER
ON
ACTIVE
OFF
NAME
DEFAULT
LINK FOR POT
OFF
LINK FOR SPI
ON
HOLD IN RESET
OFF
BC/RT
BC
NAME
DEFAULT
ON
ON
JP4, 5 ON
JP6, 9 ON
ON
ON
ON
HOLT INTEGRATED CIRCUITS
DESCRIPTION
Indicated when 3.3V power is present
Flashes at the start of a 1553 message transmit sequence
DESCRIPTION
Link to use potentiometer R3 to adjust output amplitude
Link to use SPI to adjust output amplitude
Holds the microcontroller in reset, for instance while using an
external SPI interface.
Connects memory for BC or RT messages
DESCRIPTION
Link to use on‐board 70 Ω load on Bus B output
Link to use on‐board 70 Ω load on Bus A output
Option links for transformer variants, Bus B
Option links for transformer variants, Bus A
Connects Bus A negative output to ground
Connects Bus B negative output to ground
Cut if using an external 1553 message generator
10/10/14
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