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PDF HI-8470 Data sheet ( Hoja de datos )
| Número de pieza | HI-8470 | |
| Descripción | 16-Channel Discrete-to-Digital Sensor | |
| Fabricantes | HOLTIC | |
| Logotipo |  |
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January 2015
HI-8470
16-Channel Discrete-to-Digital Sensor
with ARINC 429 Transmitter
DESCRIPTION
The HI-8470 is a sixteen channel discrete-to-digital
interface device. The IC has 16 channels which can sense
Open/Ground or 28V/Open signal levels. The voltage
threshold of the sensors is user programmable with
external resistors. Sense input thresholds may also be set
to CMOS logic levels to interface the part with other
sensors, for example an external ADC or resolver.
An on-chip ARINC 429 transmitter / line driver allows the
status of discrete lines to be transmitted in ARINC 429
format with pin-programmed label byte value, repetition
rate and transmission speed. Complete operation of the
HI-8470 is controlled by CMOS logic pins, negating the
need for a MCU or software in the application.
A single 1 MHz clock source is required for ARINC 429 bit
timing and word transmission rate scheduling.
The on-chip ARINC 429 Line Driver operates from a single
3.3V power supply, using an integrated DC/DC converter
to generate the required bipolar line voltages.
The discrete sense pins and line driver outputs are
lightning 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.
FEATURES
! Pin programmable - requires no MCU or software
control (no need for DO-178 certification)
! Robust CMOS Silicon-on-Insulator (SOI) technology
! 16 threshold-selectable discrete input channels
! Programmable Thresholds and Hysteresis
! Sense Detection Range 3V to 22V
! On-chip ARINC 429 Transmitter and Line Driver
! 3.3 V single supply operation
! Pin programmable transmit repetition rate
! Internal lightning protection circuitry for both discrete
sense lines and line driver allows compliance with
RTCA/DO-160G, Section 22 Level 3 Pin Injection
Tests.
! Adjustable sense thresholds
! DO-254 certifiable
TYPICAL APPLICATION
Digital Logic GND/Open
Lines
Discretes
28V/Open
Discretes
3.3V
CLOCK
ARINC 429 WORD ASSEMBLER
HI-8470
ARINC 429
TRANSMITTER
LINE DRIVER
+
-
ARINC 429
SCHEDULER
DC/DC
CONVERTER
ARINC 429
BUS
(DS8470 Rev. C)
ARINC 429
Label
Hard-wired ARINC 429
Transmission
Configuration
Figure 1
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HI-8470
PIN DESCRIPTIONS
PIN SYMBOL FUNCTION
94 EXTTHSOG Digital Input
95 THSLOOG
96 THSHIOG
97 EXTTHSVO
Analog Input
Analog Input
Digital Input
98 THSLOVO
99 THSHIVO
100 VLOGIC
Analog Input
Analog Input
Supply
DESCRIPTION
If high selects THSLOOG and THSHIOG for GND/Open thresholds,
else internal
Window comparator Low Threshold for GND/Open operation
Window comparator High Threshold for GND/Open operation
If high selects THSLOVG and THSHIVG for Supply/Open thresholds,
else internal
Window comparator Low Threshold for Supply/Open operation
Window comparator High Threshold for Supply/Open operation
Digital Logic supply
PULL UP/DOWN
30k pull-up
-
-
30k pull-up
-
-
-
PIN CONFIGURATION
VWET - 1
SI0 - 2
SI1 - 3
SI2 - 4
SI3 - 5
SI4 - 6
SI5 - 7
SI6 - 8
SI7 - 9
SI8 - 10
SI9 - 11
SI10 - 12
SI11 - 13
SI12 - 14
SI13 - 15
SI14 - 16
SI15 - 17
GND - 18
TEST0 - 19
TEST1 - 20
SO0 - 21
SO1 - 22
SO2 - 23
SO3 - 24
SO4 - 25
HI-8470PQIF
HI-8470PQTF
75 - SEL5
74 - SEL4
73 - SEL3
72 - SEL2
71 - SEL1
70 - SEL0
69 - TXENB
68 - GNDA
67 - TXA
66 - TXB
65 - GNDB
64 - TXADIG
63 - TXBDIG
62 - TMR0
61 - TMR1
60 - TMR2
59 - TMR3
58 - TMR4
57 - TMR5
56 - TMR6
55 - TMR7
54 - BIT31
53 - BIT30
52 - BIT29
51 - BIT28
100-pin Plastic Quad Flatpack (PQFP)
Figure 3
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5 Page 
HI-8470
LIGHTNING PROTECTION
The discrete sense pins and line driver outputs are lightning 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. Figures 5, 6 and 7
summarize the waveforms.
Waveform 3
Figure 5. DO-160G Lightning Induced Transient Voltage Waveform 3.
Voc = 600V, Isc = 24A, Frequency = 1MHz ± 20%.
HOLT INTEGRATED CIRCUITS
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| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet HI-8470.PDF ] | |
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