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
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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
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3/2/15
KIT CONTENTS


This User Guide
HI‐8470 Evaluation Board
Board Block Diagram
AN‐8470, Rev. A
HOLT INTEGRATED CIRCUITS
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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3/2/15