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 1 3/2/15 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 2 3/2/15 KIT CONTENTS This User Guide HI‐8470 Evaluation Board Board Block Diagram AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 3 3/2/15 Jumper Functions JUMPER DEFAULT VLOGIC ON Link for VLOGIC supply to the LED VDD ON Link for VDD supply current (this supplies the HI‐8470 converter for the ARINC 429 outputs) XTAL VDD ON Supplies 3.3V to the 1MHz crystal oscillator EXTCLK ON To use external clock, disconnect link and apply Vlogic level clock to the CLK test point MASTER RESET OFF In place, this holds HI‐8470 in reset TXENB 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 DESCRIPTION HOLT INTEGRATED CIRCUITS 4 3/2/15 Switch Functions SWITCH DEFAULT LABEL 0:7 OFF DESCRIPTION ARINC 429 label bits 0:7. ON = ‘1’ SPEED & ARINC BITS SPEED = ON ARINC = OFF TIMER 0:7 OFF ARINC 429 speed and ARINC 429 bits 9, 10, & 27:31. ON = ‘1’ (see table on board for positions) 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 0:7 Sets state of sensor inputs 0:7 stimuli. ON corresponds to GND or Supply. OFF corresponds to Open state. SENSOR 8:15 AN‐8470, Rev. A ON As above, sets state of sensor inputs 8:15. HOLT INTEGRATED CIRCUITS 5 3/2/15 Connector Functions Connector PIN SENSOR IN 0:7 1 to 8 SENSOR IN 8:15 1 to 8 SENSOR OUT 0:7 1 to 8 SENSOR OUT 8:15 1 to 8 9 9 9 9 DESCRIPTION Sensor inputs; Sensor 0:7 → Pins 1:8 GND Sensor inputs; Sensor 8:15 → Pins 1:8 GND Sensor outputs; Sensor 0:7 → Pins 1:8 GND Sensor outputs; Sensor 8:15 → Pins 1:8 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 6 3/2/15 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 7 3/2/15 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 8 3/2/15 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 9 3/2/15 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 10 3/2/15 3. A similar test can be done with the sensors in Supply/Open mode. In this mode, the internal thresholds are VTHImin = 15.5V and VTHLOmax = 11V. Set all the ‘Sensor Type Select’ switches to ‘1’. Put J5 and J11 in the non‐GND position. Connect a 15.5V supply on the VSense 0:7 and VSense 8:15 terminals. The guaranteed switching threshold of 15.5V is being applied to the input, with all the sensor input switches ‘ON’, all sensor outputs should be a ‘0’. 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 11 3/2/15 Connecting external sensors To connect an external sensor, first verify the corresponding sensor DIP switch is the ‘OPEN’ state. The sensor wires can be connected to the board on the pin headers Sensor In 0:7 and 8:15. See table below. When using GND/Open sensors, the VWET terminal must be used to pull up the sensors inputs. With VWET at 28V and VLOGIC at 3.3V, the wetting current will be approximately 1mA. If additional wetting current is required, connect an external resistor from VWET to the sense line. 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 12 3/2/15 SEL 8:15 VDD 0R 0R 0R 0R 0R 0R 0R 0R R15 R16 R17 R18 R19 R20 R21 R22 1 HI-8470 100 PQFP GNDB TXADIG TXBDIG TMR0 TMR1 TMR2 TMR3 TMR4 TMR5 TMR6 TMR7 BIT31 BIT30 BIT29 BIT28 9 8 7 6 5 4 3 2 1 U1 S05 S06 S07 S08 S09 S010 S011 S012 S013 S014 S015 SPEED MRN CLKIN LBL0 LBL1 LBL2 LBL3 LBL4 LBL5 LBL6 LBL7 BIT9 BIT10 BIT27 J13 J7 67 66 3 2 1 65 J8 1 2 3 64 63 62 61 60 59 58 57 56 55 54 53 52 51 VLOGIC CAN BE 3.3 TO 5V HOWEVER IF 5V IS USED J1 MUST BE LEFT OFF AND 3.3V SUPPLIED TO VDD TERMINAL. SEL 0:7 100pF C12 VDD R14 3.6K THSHIGO GHI_SET VR3 20k TP10 + C13 47uF, 16V 100pF C14 VDD R25 3.6K 100k THSLOGO GLO_SET VR4 20k TP13 1 + C15 47uF, 16V VDD J19 100pF C18 1 9 8 7 6 5 4 3 2 XTAL VDD LINK 1 2 1 MAX6816 10nF 1 J17 MASTER RESET LINK TO HOLD IN RESET + C17 C16 47uF 50V 10nF ON (CLOSED) 100k SW8 LABEL 0:7 1 2 3 4 5 6 7 8 VLOGIC 1 2 Y1 E/D VDD GND OUT 4 3 OSC, 4 PIN, 1MHz 3.3V R28 39 J18 2 EXTERNAL CLOCK TP15 1 TP16 Title GND HI-8470 DISCRETE TO ARINC DRIVER EVALUATION BOARD Size B Date: AN‐8470, Rev. A + C10 47uF, 16V R24 100k 2 2 TP14 GND NEAR U1 THSLOVO VLO_SET VR2 20k TP8 2 1 VLOGIC R27 C20 .1uF, 50V C19 OUT IN VDDGND SPEED & ARINC BITS 47uF,50V + SW7 SENSOR OUT 8:15 VLOGIC D1 C11 3 4 1 2 3 4 5 6 7 8 J15 TP12 R26 680 POWER 2 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 J14 SENSOR OUT 0:7 J16 U2 J6 1 EXT ARINC DRV A R23 9 8 7 6 5 4 3 2 ON (CLOSED) LED 10K SW6 26 27 28 29 30 31 32 33 34 35 36 37 38 CLK 39 40 41 42 43 44 45 46 47 48 49 50 SENSORS 8:15 68 R12 3.6K R13 TP18 1 2 3 4 5 6 7 8 3 2 1 TXA TXB TP17 ON (CLOSED) VLOGIC VSENSE 8:15 J11 2 2 2 GNDA 75 74 73 72 71 70 69 SW4 TRANSMIT (SPST-NC) TIMER 0:7 ON (CLOSED) VSENSE 8:15 SW5 J9 1 J10 1 1 J12 VWET SI0 SI1 SI2 SI3 SI4 SI5 SI6 SI7 SI8 SI9 SI10 SI11 SI12 SI13 SI14 SI15 GND TST0 TST1 S00 S01 S02 S03 S04 SEL5 SEL4 SEL3 SEL2 SEL1 SEL0 TXENB 1 2 3 4 5 6 7 8 ON (CLOSED) 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SENSE 0:7 TP9 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 VDD VLOGIC SW2 CLK SW3 100pF C9 100k ARINC OUT R4 R5 R6 R7 R8 R9 R10 R11 VSENSE 0:7 + C4 47uF, 16V R2 ON (CLOSED) C8 and C21 MOUNT NEAR U1 3 2 1 TP7 THSHIVO VHI_SET VR1 20k TP6 R3 VLOGIC THSHIVO THSLOVO EXTTHSVO THSHIOG TSHLO0G EXTTHSOG V+ CP+ CPVDD 0R 0R 0R 0R 0R 0R 0R 0R J5 -V 100 99 98 97 96 95 94 93 92 91 90 9 8 7 6 5 4 3 2 1 J4 R1 3.6K 1 1 C21 .1uF, 50V THSHIGO THSLOGO C5 C8 .1uF, 50V THSHIVO THSLOVO + 47uF, 50V SENSORs 0:7 2 3 4 5 6 7 8 9 9 8 7 6 5 4 3 2 1 TP3 1 GND TP4 GND 100k 4.7uF,16V,MLC C7 J2 Not Inserted 4.7uF,16V,MLC C2 2 +V 2 J3 VDD TP2 SW1 9 8 7 6 5 4 3 2 2 89 88 87 86 85 84 83 82 81 80 79 78 77 76 VLOGIC 1 47uF,50V +V J1 0R R30 0R -V + R29 TP19 C3 +V 47uF,16V,MLC -V VLOGIC 47uF,16V,MLC C1 C6 TP11 GND CNCN+ VSEL15 SEL14 SEL13 SEL12 SEL11 SEL10 SEL9 SEL8 SEL7 SEL6 TP5 ON (CLOSED) GND 1 2 3 4 5 6 7 8 TP1 HOLT INTEGRATED CIRCUITS 13 Document Number <Doc> Tuesday , April 30, 2013 3/2/15 Rev Sheet 1 of 1 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 14 3/2/15 Bill of Materials: HI‐8470 Evaluation Board Description Reference DigiKey Mfr P/N N/A C20, C8, C21, C11 -------399-1176-1-ND C16 399-1160-1-ND C9, C12, C14, C18 399-1122-1-ND C2, C7 587-1392-1-ND JetTech 35005 Kemet C0805C104M5UACTU Kemet C0805C103M5RACTU Kemet C0805C101J5GACTU Taiyo EMK325B7475KN-T 2 PCB, Bare, Eval Board Capacitor, Cer 0.1uF 20% 50V Z5U 0805 Capacitor, Cer 0.01uF 20% 50V Z5U 0805 Capacitor, Cer 100pF 20% 50V Z5U 0805 Cap Cer 4.7uF 16V X7R 20% 1210 SMD Cap Cer 47uF 10V X7R 20% 1210 SMD C1, C3 587-2783-1-ND 7 4 Cap Alum 47uF 50V 20% SMD C4, C10, C13, C15 PCE4222CT-ND 8 4 Cap Alum 47uF 16V 20% SMD C5, C6, C17, C19 PCE3889CT-ND 9 10 11 4 4 10 Header, Male 1x9, .1" Pitch Header, Male 1x3, .1" Pitch Header, Male 1x2, .1" Pitch S1012E-09-ND S1012E-03-ND S1012E-02-ND 12 13 1 18 LED Green 0805 Resistor, 0 5% 1/8W 0805 14 1 Resistor, 39 5% 1/8W 0805 J4, J13, J14, J15 J5, J11, J7, J8 J1, J2, J3, J6, J16, J18, J19, J9, J10, J12 D1 R4-R11, R15-R22, R29, R30 R28 15 1 Resistor, 680 5% 1/8W 0805 16 4 Resistor, 3.6K 5% 1/8W 0805 17 1 Resistor, 10K 5% 1/8W 0805 18 5 19 4 Resistor Network, 100K 5% 9 Res 10SIP Resistor Trim Pot 20K, 0.5W, 20T, Th. 20 7 Switch Tape Seal 8Pos SMD SW1, SW2, SW3, SW5, SW6, SW7, SW8 CT2198MST-ND Item Qty 1 2 1 4 3 1 4 4 5 2 6 Taiyo LMK325B7476MMTR Panasonic EEEHA1H470XPS Panasonic EEE1CA470SP Sullins S1012E-09-ND Sullins S1012E-03-ND Sullins S1012E-02-ND 160-1179-1-ND P0.0ACT-ND LiteOn LTST-C170GKT Panasonic ERJ6GEY0R00V P39ACT-ND Panasonic ERJ6GEYJ390V R26 P680ACT-ND Panasonic ERJ6GEYJ681V R1, R12, R14, R25 P3.6KACT-ND Panasonic ERJ6GEYJ362V R13 P10KACT-ND Panasonic ERJ6GEYJ103V R27, R23, R24, R3, 770-101-R100KP- CTS 770101104P R2 ND VR1, VR2, VR3, VR4 490-2881-ND Murata PV36W203C01B00 CTS 219-8MST Continued on next page. AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 15 3/2/15 Bill of Materials (cont.): HI‐8470 Evaluation Board Description Reference DigiKey Mfr P/N Osc 1.MHz 3.3V, 5x7mm SMD Switch Tactile SPST-NC 0.05A, 50V Y1 SW4 631-1122-1-ND EG4588CT-ND FOX FXO-HC735-1 E-Switch TL3310AF120QG 1 Test Point, Red Insulator, 0.062" hole TP19 5010K-ND Keystone 5010 5 Test Point, Black Insulator, 0.062" hole 5011K-ND Keystone 5011 5012K-ND Keystone 5012 5013K-ND Keystone 5013 5014K-ND Keystone 5014 HOLT IC Max6816EUS 3480K-ND Holt IC Maxim MAX6816EUS+T Keystone 3480 H343-ND H236-ND PMS 440 0031 PH B&F Intlwz 004 Item Qty 21 22 1 1 23 24 25 2 26 2 27 7 28 29 30 1 1 4 31 32 4 4 TP1, TP14, TP2, TP16, TP4 Test Point, White Insulator, 0.062" hole TP15, TP3 Test Point, Orange Insulator, 0.062" TP12, TP18 hole Test Point, Yellow Insulator, 0.062" hole TP17, TP6, TP8, TP10, TP13, TP7, TP9 HI-8470PQI - 100PQFP U1 IC Debouncer SW SGL SOT143-4 U2 Stand-off, Threaded #4-40F, 1/2" Long Any Round Machine Screw, #4-40 x 1/4" Any Lock Washer, Int.Tooth #4-40 Any AN‐8470, Rev. A HOLT INTEGRATED CIRCUITS 16 3/2/15 REVISION HISTORY Revision Date AN-8470, Rev. New 5-3-13 New AN-8470, Rev. A 3-2-15 Add BOM. Make minor corrections. AN‐8470, Rev. A Description of Change HOLT INTEGRATED CIRCUITS 17 3/2/15