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HOLT HI?8470 User Manual

Summary of HI?8470

  • Page 1

    An‐8470, rev. A holt integrated circuits 3/2/15 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,...

  • Page 2

    An‐8470, rev. A holt integrated circuits 3/2/15 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, exte...

  • Page 3

    An‐8470, rev. A holt integrated circuits 3/2/15 3 kit contents  this user guide  hi‐8470 evaluation board board block diagram.

  • Page 4

    An‐8470, rev. A holt integrated circuits 3/2/15 4 jumper functions jumper default description 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...

  • Page 5

    An‐8470, rev. A holt integrated circuits 3/2/15 5 switch functions switch default description label 0:7 off arinc 429 label bits 0:7. On = ‘1’ speed & arinc bits speed = on arinc = off arinc 429 speed and arinc 429 bits 9, 10, & 27:31. On = ‘1’ (see table on board for positions) timer 0:7 off sets a...

  • Page 6

    An‐8470, rev. A holt integrated circuits 3/2/15 6 connector functions connector pin description sensor in 0:7 1 to 8 9 sensor inputs; sensor 0:7 → pins 1:8 gnd sensor in 8:15 1 to 8 9 sensor inputs; sensor 8:15 → pins 1:8 gnd sensor out 0:7 1 to 8 9 sensor outputs; sensor 0:7 → pins 1:8 gnd sensor o...

  • Page 7

    An‐8470, rev. A holt integrated circuits 3/2/15 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 li...

  • Page 8

    An‐8470, rev. A holt integrated circuits 3/2/15 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....

  • Page 9

    An‐8470, rev. A holt integrated circuits 3/2/15 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 transmitt...

  • Page 10

    An‐8470, rev. A holt integrated circuits 3/2/15 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 o...

  • Page 11

    An‐8470, rev. A holt integrated circuits 3/2/15 11 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....

  • Page 12

    An‐8470, rev. A holt integrated circuits 3/2/15 12 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 gn...

  • Page 13

    An‐8470, rev. A holt integrated circuits 3/2/15 13 tp5 vlogic 3 2 14 on ( c l o s e d ) 8 5 6 7 sw3 sel 0 : 7 vlogic vs ense 8 :15 tp11 3 2 1 4 on (c lo se d) 8 5 6 7 sw1 r23 100k 1 2 3 4 5 6 7 8 9 +v r2 0 0 r r2 1 0 r r1 8 0 r r1 9 0 r r1 7 0 r r1 6 0 r r2 2 0r r1 5 0 r c11 10nf r28 39 xtal vdd lin...

  • Page 14

    An‐8470, rev. A holt integrated circuits 3/2/15 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 externa...

  • Page 15

    An‐8470, rev. A holt integrated circuits 3/2/15 15 bill of materials: hi‐8470 evaluation board item qty description reference digikey mfr p/n 1 1 pcb, bare, eval board n/a -------- jettech 35005 2 4 capacitor, cer 0.1uf 20% 50v z5u 0805 c20, c8, c21, c11 399-1176-1-nd kemet c0805c104m5uactu 3 1 capa...

  • Page 16

    An‐8470, rev. A holt integrated circuits 3/2/15 16 bill of materials (cont.): hi‐8470 evaluation board item qty description reference digikey mfr p/n 21 1 osc 1.Mhz 3.3v, 5x7mm smd y1 631-1122-1-nd fox fxo-hc735-1 22 1 switch tactile spst-nc 0.05a, 50v sw4 eg4588ct-nd e-switch tl3310af120qg 23 1 tes...

  • Page 17

    An‐8470, rev. A holt integrated circuits 3/2/15 17 revision history revision date description of change an-8470, rev. New 5-3-13 new an-8470, rev. A 3-2-15 add bom. Make minor corrections..