HOLT HI?1590 User manual

AN-1590 Rev. B Holt Integrated Circuits
HI-1590 1553B Dual Transceiver
with SPI Amplitude Control
Evaluation Board
April 2018

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REVISION HISTORY
Revision
Date
Description of Change
AN-1590 Rev. New
10-10-14
Initial Release
Rev. A
03-14-17
Reformat document to newer template.
Update schematic to correct error in wiring of J1, Bus B
connector.
Remove obsolete section on Freescale Development
Tools. New Instructions included separately with Kit.
Rev. B
04-09-18
Update schematic and BOM to include TVS hot switching
protection diodes.

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INTRODUCTION
The Holt HI-1590 Evaluation Board demonstrates features of the HI-1590 MIL-STD-1553B dual
transceiver IC. This device transmits and receives Manchester encoded 20 bit MIL-STD-1553B
serial data suitable bus transformers. Transceiver drive amplitude can be digitally adjusted from
0 to 26 Vp-p through the SPI interface. Adjustment can also be made with a 0 to 3.3VDC analog
control signal; a potentiometer is provided for this. Amplitude controls for both buses are
ganged together. In SPI mode, a low range option allows for more accurate amplitude
adjustment from 0 to 4.9 Vp-p. The board runs from a single 3.3V ±5% supply voltage. A MIL-
STD-1553B protocol message generator and receiver are included on the board to demonstrate
the HI-1590 features. The EVM (Evaluation Module) includes a microcontroller that generates
the SPI messages, the interface is through a terminal emulator connected to a PC through the
USB interface. The EVM is shown in the picture below:
Fig 1 –HI-1590 Evaluation Board

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This guide summarizes how to set up and running quickly.
KIT CONTENTS
This User Guide
HI-1590 Evaluation Board
Mini USB Serial Cable.
Board Block Diagram
MC9S12XD
16 Bit MCU
SPI
USB
DIP SW
(4) DIP SW(6)
RESET Button
3.3V
Supply
RESET Transceiver A DB2791
TRANSFORMER
HI-1590
BUSA
Transceiver B DB2791
TRANSFORMER BUSB
Message A
1553B
Message
Generator
Message B
RUN
EEPROM
1EEPROM 2
BC RT DIP SW
(5)
DIP SW
(5)
ANALOG CONTROL
VCONT
ACTIVE

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

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Switch Functions
REF
NAME
DEFAULT
DESCRIPTION
SW1/1
VSEL
ON
Selects output control of amplitude range, using SPI.
ON = SPI control 0-24V, Low = SPI, 0-2.4V
SW1/2
TXAINH
OFF
Inhibits the transmitter output of transceiver A
SW1/3
TXBINH
OFF
Inhibits the transmitter output of transceiver B
SW1/4
RXAEN
ON
Enables the receiver of transceiver A
SW1/5
RXBEN
ON
Enables the receiver of transceiver B
SW3
RUN
Press = Starts 1553 messages
SW4
STOP
Press = Stops 1553 messages
SW5/1-5
AUTOEN etc
01101
Message loading control (leave in default)
SW6/1-6
RT1A4:0, RT1AP
000000
RT Address (only used if RT mode available)
SW7
RESET
Press to reset the microcontroller and control software
Connector Functions
REF
NAME
DESCRIPTION
J1
BUSB
1553 Bus A connection (secondary of transformer)
J2
BUSA
1553 Bus B connection (secondary of transformer)
J3/ 1,2
RXA/nRXA
Differential Logic signal from HI-1590 Bus A receive data pins
J3/ 3,4
RXB/nRXB
Differential Logic signal from HI-1590 Bus B receive data pins
J6
Not fitted
SPI interface for the EEPROMs
J7
Data connector to load 1553 messages
J9
USB
Connect to PC to send SPI commands from terminal emulator
J10
External SPI
Use to connect an external SPI for HI-1590 control
J11
Debug Header
Used for downloading microcontroller firmware

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Test Point Functions
REF
NAME
DESCRIPTION
TP1/TP2
BUSB
1553 Bus B connection (secondary of transformer)
TP4/TP6
BUSA
1553 Bus A connection (secondary of transformer)
TP3, 8,9,10
GND
Board Ground
TP5
VCONT
Connection to measure of input analog amplitude control, note that
J5 should be open. J4 should be open when inputting a voltage.
TP6
UPDATE
Test point for Update signal indicates when MIL-STD-1553B word has
been received
TP7
VSEL
This pin monitors voltage on the VSEL pin control on the output
amplitude.
High = SPI control 0-24V
Float = Analog Control
Low = SPI Control, 0-5.1V
TP3, 8, 9, 10
GND
Board Ground
TP11
3V3
VLOGIC Supply, connect power supply here
TP21
VDD
VLOGIC after supply filter
TP13
IRQ
INTERRUPT
TP14
ACTIVE
Produces pulse just before 1553 message starts, can be used to
trigger scope.
TP17/18
TXDO/RXDO
USB data.
TXA, nTXA
Connect external 1553 data here if not using the on board message
generator for BUSA. Need to cut links TXA and nTXA.
TXB, nTXB
Connect external 1553 data here if not using the on board message
generator for BUSB. Need to cut links TXB and nTXB.

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Using the Board
1. Check all the link and switch positions comply with the tables above. Connect a 3.3V, 1A
supply to the 3V3 test point. A 1A supply current is required at maximum amplitude. Verify
the ‘Power On’ LED is lit; the board should take about 160mA, when not sending 1553
messages. Connect the mini USB lead to your PC and then to the HI-1590 board. Your PC
should automatically install the driver, if not the driver FT231 can be installed from the Holt
CD. If you have problems installing the driver please refer to the FTDI website below:
http://www.ftdichip.com/Documents/InstallGuides.htm
2. All control of the HI-1590 is done through the ‘Control Console’. This requires use of a
terminal emulator for communication, such as HyperTerminal or Tera Term. Tera Term is
used with Windows versions of Vista or later and is supplied on the Holt CD.
To install Tera Term:
Use the Tera Term installer program teraterm.exe from the Holt CD. Accept the license
agreement stating redistribution is permitted provided that copyright notice is retained.
The notice can be displayed from the Tera Term window by clicking Help then clicking
About Tera Term. Continuing to install…
Accept the default install destination and click Next.
At the Select Components screen, unselect all options except Additional Plugin =
TTXResizeMenu and click Next.
Select the installed language, then click Next.
Accept the default Start Menu folder, then click Next.
Select any desired shortcuts, then click Next.
At the Ready to Install screen, click Install.
Run the Tera Term program. At the New Connection screen, select Serial and choose the
selected USB serial COM port, you can find the correct COM port using Device Manager.
3. Click Setup then Serial Port to open the serial port setup window.
Choose the COM port for the mini-USB connection and then select the following settings:
Baud Rate: 115200, Data: 8 bits, Parity: none, Stop: 1 bit, Flow Control: none
4. The evaluation software is preprogrammed into the microcontroller and was loaded at the
Holt Applications Support Center. On pressing the ‘RESET MICRO’ button on the board, the
software displays a message on the monitor, as shown below.

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Note: If under any circumstances the software locks up, use the ‘RESET’ key to restart.
5. Press the ‘A’ key to set the output amplitude. Enter the maximum amplitude of ‘FF’ as shown
below.
6. Connect an oscilloscope to the ABUS and BBUS terminal, with the grounds going to nABUS
and nBBUS respectively. Grounding the negative bus terminals provides differential voltage
measurements using just one scope probe per bus. Trigger the scope from the ACTIVE test
point. Press the STOP button, this loads the 1553 messages. Press the RUN button to start
message transmission. The messages will be transmitted alternately on the A and B buses.
Check that a 1553 signal of about 24V p-p amplitude is seen on one of the buses, as shown in
Fig 2 below. Every 5 seconds it will switch to the other bus and during transmission you
should see the 3.3V supply current go up to about 1A.

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Fig 2: Yellow is BUSA output, green is BUSB, Red is the ACTIVE trigger signal
7. The HI-1590 can also read back data from the DAC register but only after a value has been
written into the register. Press the ‘D’ key, type in ‘80’, the previous setting of ‘FF’ should be
read out as shown below. Observe the amplitude on the scope; this should be reduced by
half, or approximately 12V p-p.
8. The SPI software has a ramp function, this ramps the amplitude on both outputs up to
maximum and back down to zero in a ‘sawtooth’ function. Press the ‘Y’ button and observe
the amplitude rising and falling. Whilst in this mode switch the VSEL switch to ‘Low’, this
selects the low amplitude, you should see the oscilloscope trace go down to one fifth
maximum amplitude or about 5V.
9. As well as SPI control of amplitude through a DAC, the HI-1590 has the option of using an
analog voltage of 0 to 3.3VDC to control the amplitude. To use this feature move the jumper