HOLT HI-35850 User manual

AN-35850 Rev. New Holt Integrated Circuits
HI-35850 ARINC 429 Protocol IC
1x RECEIVER
1x TRANSMITTER
ADK-35850 Application Development Kit
Users Guide
January 25, 2021

AN-35850
2 Holt Integrated Circuits
REVISION HISTORY
Revision
Date
Description of Change
AN-35850,Rev. New
01-25-2021
Initial Release

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3 Holt Integrated Circuits
Introduction
The Holt ADK-35850 Evaluation board demonstrates the features of Holt’s ARINC 429 HI-35850. The HI-
35850 includes one complete ARINC 429 receiver and transmitter with line driver. The HI-35850 is a new
version of the HI-3585 but has a much higher 12MHz SPI frequency. The example board set includes an
ARM Cortex M3 base board and the HI-35850 plug-in daughter card. The kit uses IAR as the development
IDE and an integrated USB debugger port is included on the base board so no other USB programming
adapters are needed.
This guide describes how to set up and run the pre-programmed demos. Additional support material and
all required project software are found in the included Holt USB memory stick. A version of the
demonstration software is pre-programmed into the microcontroller flash which makes the board
operational right out of the box without installing or running the provided software development tools. A
later section in this guide provides instructions how to install IAR and load the demo program. Installing
IAR is not required to run the demos since this program is pre-programmed in the MCU flash memory.
ADK-35850 Demo Board, mounted on the ARM Cortex M3 MCU Board

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Evaluation Kit Contents
This User Guide.
Holt HI-35850 IAR Software Project and Documentation on an USB memory stick.
IAR Systems Embedded Workbench® for ARM (32KB free KickStart) download link on USB
memory stick.
Plug-in 5V DC power adapter.
USB mini debug interface cable.
RS-232 serial cable, DB-9M to DB-9F for console I/O using a connected computer.
USB to serial dongle adapter.
2-board assembly comprised of:
Upper HI-35850 daughter board and Lower MCU board with (Microchip/Atmel) ARM Cortex M3
16-/32-bit microprocessor, debug interface and regulated 3.3VDC power supply
The HI-35850 daughter card is separable and useable for user prototyping on other platforms.
Hardware Block Diagram
Cortex M3
MCU board HOLT
HI-35850
SPI (4) 12MHz Max.
RS-232 Console
USB Debug Port
LEDs
Debugger SWD or
JTAG, Power
User Push Button
Switches SW1, SW2
SW1 DIPs
(4)
J3, J10 Host I/F Header for
standalone use
RESET Button
SW3
ARINC 429 Receiver
nMR
1 MHz
OSC
5V to 3.3V
Reg +3.3V
5V
ARINC AOUT27 BOUT27
J7, J8
Header
Pins
Status LEDs:
TX amber
ERR red
RX green
User1 green
User2 green
J6
Header
Pins
INT
ARINC AOUT37 BOUT37 J5 Header
Pins
Main host ARM processor card Holt HI-35850 daughter card
3.3V to +5V and
-5V DC-DC
converter

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Push-buttons
Push-button Switches
(on main CM3 board)
DESCRIPTION
SW1
Performs SPI sequences for SPI trouble shooting. See Section
on SPI trouble shooting towards the end of this document.
SW2
Transmits maximum number of FIFO messages (32)
continuously. Press ‘q’ to quit.
DIPSW1 SWITCHES
SWITCH
DEFAULT
DESCRIPTION
SW 1
ON
ON = SPI 12MHz Frequency for HI-35850.
OFF = HI-3585 compatibility mode. Sets SPI frequency
to 2.4MHz.
SW 2
Available to user.
SW 3
Available to user
SW 4
Available to user.

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HI-35850 supply current measurements
Jumper shunts J2, J1 and J3 can be removed to isolate 3.3V, +5 and -5V on the HI-35850 to allow current
measurements of the HI-35850.
External Host interface to the HI-35850 daughter board
The HI-35850 daughter board can be separated from the MCU board and connected to a user FPGA or a
host MCU for quick prototyping purposes. The interface signals are provided on J10 header connector and
a few others on J3. The daughter card accepts only 3.3 volts supplied by the lower main board. A DC-DC
LT3463A converter regulator takes 3.3V and generates +/- 5V for the HI-35850. This is meant for
demonstration purposes. See Analog Devices website for performance data and suitability for the
intended application. In summary it operates between -40C to 85C with a conditional note 2. See the data
sheet for more details. https://www.analog.com/en/products/lt3463.html
J10 Pin
SIGNAL
1
nCS(SPI)
2
SCK (SPI)
3
MOSI (SPI)
4
MISO (SPI)
5
RFLAG
6
TFLAG
7
-
8
GND
9
3V3
J3 Pin
SIGNAL
28
nMR
30
RFLAG
32
TFLAG
LED Indicators
LEDS
FUNCTION
TYPICAL USAGE
LED1
User1
Available to user
LED2
User2
Available to user
LED3
RX
Host controlled –Typically flashes On during RX FIFO
message reads in Demo 0.
LED4
ERROR
Host controlled - Available to user to indicate errors
LED5
TX
Host controlled –Typically flashes On when transmitting in
Demo 0.

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Getting Started
The first section of this user guide provides instructions how to set up the demo board and run the built-
in demo programs and utilities that are pre-programmed into the Microchip/Atmel ARM Cortex M3 MCU.
The next section instructs how to install the IAR EWARM IDE and the Holt demonstration program. The
supplied demo program on the USB memory stick is the same demo already programmed in MCU flash
memory.
Hardware Design Overview
Refer to the end of this guide for separate schematic diagrams and bills of material for the upper daughter
board and lower MCU board.
The detachable daughter board can be separated from the lower MCU board for connection to a user-
supplied alternate MCU or FPGA board. The inter-board headers are located on 0.1” (2.54 mm) grid for
compatibility with generic prototyping boards. All host interface signals go through the inter-board
headers. See the External Host interface header pin description for the pin list in the previous section.
The lower ARM Cortex M3 board is based on the flash-programmable Microchip /Atmel AT91SAM3U-EK
MCU. A 4-signal Serial Peripheral Interface (SPI) connects to the HI-35850 DUT. A UART-based serial port
provides RS-232 console I/O (optional). An uncommitted USB 2.0 port is available for future expansion.
Two pushbuttons are available for software interaction. A RESET pushbutton resets the ARM
microprocessor, which in turn controls the DUT Master Reset signal.
The ARM Cortex M3 board includes “J-Link On Board” debug interface, licensed from www.segger.com,
providing out-of-box readiness without having to buy a costly JTAG debug cable. The kit includes a mini
USB cable for connecting the board’s debug interface to your computer. (For users already owning an
ARM debug interface with ribbon-cable connector, an ARM-standard 2x10 debug connector provides
debug connectivity. In this case, jumper JP2 on the bottom of the lower board should be soldered closed
to disable “J-Link On Board”).

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Initial Set Up and Quick Start
Before attempting to run the demo programs, a suitable PC is required with serial COM support so the
demo programs and utilities can be invoked by entering commands on the console menu. This demo
program is already flashed into the Cortex M3 MCU and operates out of the box –no IDE flash
programming is required to run the demo programs.
1. A PC needs a serial (COM) port or USB connection and a “terminal emulation” program like
TeraTerm. Most computers no longer have RS232 com ports so will require a serial-to-USB
adapter, supplied with the ADK. Connect this to the computer’s USB port and the 9 pin connector
to the ADK board.
2. If using Windows 2000 or Windows XP, you can use HyperTerminal for terminal emulation. Open
HyperTerminal by clicking Start then All Programs; click the Windows Accessories then
Communications program group. Double-click HyperTerminal to run it. Skip the next paragraph.
If using Vista, Windows 7 or Windows 10…
HyperTerminal is not included with these versions of Windows. Install the free open-source
terminal emulation program, TeraTerm 4.71, by running the provided teraterm-4.71.exe installer
program 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 TeraTerm window
by clicking Help then clicking About TeraTerm. Continuing to install…
Accept the default install destination and click Next.
At the Select Components screen, unselect all options except Additional Plug-in =
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 TeraTerm program. At the New Connection screen, select (x)Serial and choose the
selected COM port. Click Setup then Serial Port to open the serial port setup window. Choose
these settings: Baud Rate: 115200, Data: 8 bits, Parity: none, Stop: 1 bit, Flow Control: none.
3. Plug-in the provided 5V DC power supply and connect the cable to the power input jack on the
lower circuit board. If TeraTerm is running and configured correctly, the command menu below
should appear in the console window. This menu appears whenever board power is applied, or
when the RESET pushbutton is pressed. After verifying correct TeraTerm communication with the
evaluation board, the terminal set up can be saved by clicking Setup then Save Setup.

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4. At power up, all the LED’s will briefly flash.
Getting Started with the Demos
After powering up the board the menu of commands are displayed on the console.
-------------------------------------------------
Holt Integrated Circuits HI-35850 CM3 Demo Program Ver. 1.0
Compiled: Jan 11 2021 13:10:28
-------------------------------------------------
DIP switches: 00
Status Reg: 0x0009
Control Reg: 0x2020
Divisor Reg: 0x01
Status Register expected value OK
*************************************************
Holt Integrated Circuits HI-35850, 3585 CM3 Demo Program Ver. 1.0
Compiled: Jan 11 2021 14:14:35
*************************************************
------------- HI-35850 Demo --------------
Press '0' - TX AND RX RECEIVE
Press '1' - Load Transmit FIFO with 32 messages
Press '2' - Load Transmit FIFO with 8 messages
Press '3' - Reads ARINC RX FIFO and displays
Press '4' - Reads ARINC RX FIFO and displays in Loop mode
Press 'M' - Write Label Memory
Press 'm' - Read and Display Label Memory
Press 'l' - Toggle Enable or Disable Label Memory CR2n
----------- UTILITIES -------------
Press 'Space Bar' - Display Selected Registers
Press 'c' - ACLK divisor
Press 'f' - Toggle RFLAG CR15, TFLAG CR14 in Control Word
Press 'h' - Display this Menu again
Press 't' - Toggle Self-Test Mode vs. Normal Mode
Press 's' - Toggle ARINC TX and RX speed
Press 'S' - SPI freq
===========================================================
Press 'H' for this help menu, or press any valid menu key. >>
It is highly recommended to first review the HI-35850 data sheet to gain a basic understanding of the
device so you get the most benefit from the demos and utilities described in this guide.

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Nearly all menu commands entered on the console instruct the ARM MCU to issue SPI Op Codes to write
or read data in the HI-35850. The host configures the HI-35850 by writing to a Control Register using the
SPI interface.
Demo Quick Start Instructions
At anytime Press the space bar at the menu prompt to read and display the Control Register, Status
Register and Divisor Register.
Status Reg: 0x0009
Control Reg: 0x2000
Divisor Reg: 0x01
Demo 0:
Press ‘0’ to start this demo which transmits an incrementing data message and repeats every 500ms.
If the board has jumper wires (not provided) to connect the transmitter outputs to the receiver inputs
the display will show both TX and RX data.
To simplify the transmit and receive demos below, command ‘t’ will be entered first which will
enable the HI-35850 Self-Test feature. This causes the transmitted messages to be internally looped
back internally to the receiver. This way no external jumper connections are required to loop the
transmitter output to the receiver inputs.
Press ‘t’ to enable Self-Test mode, press again to disable it.
> t
> Self-Test ON
To see RX data even without the jumpers press ‘t’ from the menu before entering this demo to put
the part into Self-Test mode. After pressing ‘t’ then press ‘0’ again. To exit demo 0, press ‘q’ to get
back to the main menu.
The console output will appear like this using Self-Test Mode:
Press 'H' for this help menu, or press any valid menu key. >>
t
Self-Test ON
> 0
Press 'q' to quit
Status Reg: 0x0009
Control Reg: 0x2000
Divisor Reg: 0x01