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HI‐8470 16 Sensor Array with
ARINC 429 Output, Ground/Open or
AN‐8470, Rev. A
Supply/Open Sensors
Evaluation Board
User Guide
March 2, 2015
HOLT INTEGRATED CIRCUITS
1
23351 Madero,
Mission Viejo, CA
92691. USA.
Tel:
+ 1 949 859 8800
Fax:
+ 1 949 859 9643
Email: sales@holtic.com
Web:
www.holtic.com
3/2/15
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Summary of Contents for HOLT HI?8470
- Page 1 23351 Madero, Mission Viejo, CA 92691. USA. Tel: + 1 949 859 8800 Fax: + 1 949 859 9643 Email: sales@holtic.com Web: www.holtic.com HI‐8470 16 Sensor Array with ARINC 429 Output, Ground/Open or Supply/Open Sensors Evaluation Board User Guide March 2, 2015 AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 1 ...
- Page 2 INTRODUCTION The Holt HI‐8470 Evaluation Board demonstrates features of the HI‐8470 16 Sensor to ARINC 429 output IC. The board and the HI‐8470 can be run from a single 3.3V+/‐ 5% supply voltage. The device has preset internal sensor thresholds, external thresholds can also be set with board‐mounted potentiometers. The HI‐8470 and EVM (Evaluation Module) require no software for control; all functions are set by hardware switches. DIP switches configure the device and data inputs. The EVM is shown in the picture below: This guide summarizes how to get set up and running quickly. AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 2 ...
- Page 3 KIT CONTENTS This User Guide HI‐8470 Evaluation Board Board Block Diagram AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 3 ...
- Page 4 ON In place; push button ‘TRANSMIT’ is pressed to transmit. For continuous transmit, remove the link. EXTTHSOG 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. EXTTHSVO 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. J5 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. J11 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. TST0 OFF When in place, the sensor inputs are all set to Low, and results in Highs at the sensor outputs. TST1 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 AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 4 ...
- Page 5 DESCRIPTION LABEL 0:7 OFF ARINC 429 label bits 0:7. ON = ‘1’ SPEED & SPEED = ON ARINC 429 speed and ARINC 429 bits 9, 10, & 27:31. ARINC BITS ARINC = ON = ‘1’ (see table on board for positions) OFF TIMER 0:7 OFF Sets ARINC 429 message transmission timer. ON = ‘1’ SEL 0:7 OFF Sets sensor type for SI 0:7. OFF = GND/Open ON = Supply/Open SEL 8:15 OFF Sets sensor type for SI 8:15. OFF = GND/Open ON = Supply/Open SENSOR ON Sets state of sensor inputs 0:7 stimuli. 0:7 ON corresponds to GND or Supply. OFF corresponds to Open state. SENSOR ON As above, sets state of sensor inputs 8:15. 8:15 AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 5 ...
- Page 6 1 to 8 Sensor inputs; Sensor 0:7 → Pins 1:8 0:7 9 GND SENSOR IN 1 to 8 Sensor inputs; Sensor 8:15 → Pins 1:8 8:15 9 GND SENSOR 1 to 8 Sensor outputs; Sensor 0:7 → Pins 1:8 OUT 0:7 9 GND SENSOR 1 to 8 Sensor outputs; Sensor 8:15 → Pins 1:8 OUT 8:15 9 GND Board Set Up 1. Make sure the link and switch positions are as listed in the tables above. Connect a 3.3V supply to the Vlogic test point. The VDD link connects power from VLogic to the HI‐8470 VDD pin, which supplies the internal converter. The Vlogic jumper supplies only the LED. 2. To measure the device’s Vlogic supply current; remove the Vlogic GND jumper and connect an ammeter across the jumper pins. This measures only the device current and not the other circuitry on the board. To measure Vdd current, remove the Vdd jumper and connect the ammeter across the jumper pins. Remove the XTAL VDD link; the current measured will be for the device ‘unclocked’. To measure the device clocked current consumption, an external 1MHz clock should be used, connected to the CLK test point, after removing the EXTCLK link. AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 6 ...
- Page 7 ARINC 429 Output Testing 1. The device transmits the sensor data to the ARINC 429 output when the TXENB is switched high. To generate just one ARINC 429 word, press the Transmit button. To enable continuous ARINC 429 transmission, remove the TXENB link. Before testing ensure the switches and links are in the default states shown in previous tables, then set Label Switch #8 to a ‘1’ and Timer Switch #1 to ‘1’. 2. Enable continuous ARINC 429 transmission by removing the TXENB link. Connect an oscilloscope to the ARINC 429 outputs. For best results, use differential mode. Jumper TST0 forces all the sensor inputs to ‘0’, this forces the sensor outputs to a ‘1’. Observe the ARINC 429 output waveform. It should look similar to the waveform shown below: 3. Now link jumper TST1 only, forcing the sensor inputs to all 1’s. The output pattern for the data should be all 0’s as shown below: AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 7 ...
- Page 8 4. Now link jumper TST1 and TST0, forcing the sensor inputs to a continuously alternating 01. The output pattern for the data should be 1010101010101010 be as shown below: 5. Replace TXENB link. Press Transmit, only one ARINC 429 word is transmitted. Change the Speed switch to ‘0’, the waveform, should change to 12 kbps rate as shown below: AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 8 ...
- Page 9 6. Set speed switch back to ‘1’. The TIMER switch allows for changing the transmit repetition rate. To use this feature, remove the TXENB link to enable continuous transmission. Ensure the timer switch is set to ‘10000000’; one word will be transmitted every 10ms. Observe this on the oscilloscope; it should look like the picture below: AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 9 ...
- Page 10 7. Remove jumpers TST0 and TST1. Use the Speed and ARINC 429 bits switch to toggle ARINC 429 output bits 9, 10 and 27 to 31, see table on the board for switch positions. Check the corresponding bit changes on the ARINC 429 output. Sensor Input and Output Testing 1. Remove jumpers TST0 and TST1. Leave the TXENB link off. Set up the board in default state, the sensors are in GND/Open state and inputs to switched to GND (ON). Now change all the Sensor input switches to ‘OFF’, the output waveform should show the all ‘1s’ pattern, shown earlier in this document. Switch Sensor input 0 to ‘ON’ (GND). The ARINC 429 output should change to the one below, with the changed sensor output state transmitted on as a ‘1’ on bit 11. 2. Set all the sensor input switches to ‘ON’ (GND), all the ARINC 429 data outputs (bits 11:26) should change to a ‘1’. This can also be checked on the connectors SENSOR OUT 0:7 and 8:15. AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 10 ...
- Page 11 4. Lower the input voltage to 11V, this is the guaranteed low switching threshold, all the sensors outputs should now have changed to a ‘1’. This can be observed on the ARINC 429 output or on the Sensor Out pins. 5. To change the thresholds, remove the EXTTHSOG and EXTTHVO jumpers. External thresholds can now be applied using the potentiometers VR1 to VR4. Connect a voltmeter to the terminal above the potentiometer, adjust the potentiometer to set the threshold voltage. Note that threshold set is 10x the voltage on the test point. A typical set of threshold settings is shown in the table below: TEST POINT VOLTAGE THRESHOLD (X10) THSLOGO 0.45 4.5 THSHIGO 1.05 10.5 THSLOVO 0.6 6.0 THSHIVO 1.2 12.0 6. To test the external thresholds, the sensor input switches should be set to ‘Open’ and the sensor input voltage applied to the Sensor Input pin (see table in next section). Connecting an external ARINC 429 driver The connector ‘EXT ARINC 429 DRIVER’, provides CMOS logic level outputs for connecting an external ARINC 429 driver. In this case, the VDD supply is still required on the board as this supplies the Crystal Oscillator and the Clean Switch circuit. However if pin one of the XTAL VDD link and pin 1 of TXENB link are connected to an external 3.3V, then VDD link can be removed. AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 11 ...
- Page 12 See datasheet for more guidance on wetting current tables and adjustment. Pin Sensor Number Number 0:7 8:15 1 0 8 2 1 9 3 2 10 4 3 11 5 4 12 6 5 13 7 6 14 8 7 15 9 GND GND Connection pins for external sensors AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 12 ...
- Page 13 ON (CLOSED) TP15 100k Title LABEL 0:7 HI-8470 DISCRETE TO ARINC DRIVER EVALUATION BOARD 5 6 7 EXTERNAL CLOCK Size Document Number OSC, 4 PIN, 1MHz 3.3V VLOGIC <Doc> Date: Tuesday , April 30, 2013 Sheet AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 13 ...
- Page 14 Appendix 1 Lightning Protection The sense inputs and ARINC 429 driver outputs (TXA and TXB) are protected to RTCA/DO‐160G, Section 22 Level 3 Pin Injection Test Waveform Set A (3 & 4), Set B (3 & 5A) and Set Z (3 & 5B) without the use of any external components. For more details please see the latest datasheet and Application Note AN‐305. The level of lightning protection can be increased by using external components, please see the Application Notes available on Holt’s website http://www.holtic.com. The layout of a HI‐8470 board should always have low conductivity paths from the device power/ground pin to the relevant power or ground origin. These paths should avoid proximity to sense or other signal traces; this applies to above and below as well as horizontally. It is good practice to have a power and ground ‘moat’ beneath the sense line to prevent disturbance on these lines during a ‘lightning’ event. AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 14 ...
- Page 15 R27, R23, R24, R3, 770-101-R100KP- CTS 770101104P 10SIP Resistor Trim Pot 20K, 0.5W, 20T, Th. VR1, VR2, VR3, VR4 490-2881-ND Murata PV36W203C01B00 Switch Tape Seal 8Pos SMD SW1, SW2, SW3, CT2198MST-ND CTS 219-8MST SW5, SW6, SW7, Continued on next page. AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 15 ...
- Page 16 Keystone 5013 hole Test Point, Yellow Insulator, 0.062" hole TP17, TP6, TP8, 5014K-ND Keystone 5014 TP10, TP13, TP7, HI-8470PQI - 100PQFP HOLT IC Holt IC IC Debouncer SW SGL SOT143-4 Max6816EUS Maxim MAX6816EUS+T Stand-off, Threaded #4-40F, 1/2" Long 3480K-ND Keystone 3480 Round Machine Screw, #4-40 x 1/4"...
- Page 17 REVISION HISTORY Revision Date Description of Change AN-8470, Rev. New 5-3-13 AN-8470, Rev. A 3-2-15 Add BOM. Make minor corrections. AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3/2/15 17 ...
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