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PDF HI-8436 Data sheet ( Hoja de datos )
| Número de pieza | HI-8436 | |
| Descripción | 32-Channel Ground/Open or Supply/Open Low Threshold Sensor | |
| Fabricantes | HOLTIC | |
| Logotipo |  |
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July 2016
HI-8436
32-Channel Ground/Open or Supply/Open
Low Threshold Sensor with SPI Interface
GENERAL DESCRIPTION
The HI-8436 is a 32-channel discrete-to-digital sensor
fabricated with Silicon-on-Insulator (SOI) technology
designed to interface with a Serial Peripheral Interface
(SPI).
Four banks of 8 sense inputs can be programmed as either
GND/Open or Supply/Open sensors. Supply/Open
sensing is also referred to as 28V/Open sensing.
All sense inputs are internally lightning protected to
DO160G, Section 22, Cat AZ, BZ and ZZ without external
components.
The sensing circuit window comparator thresholds are set
by programming the center threshold and hysteresis
registers to values from 0.4V to 5.2V. The digital values of
the sensed inputs can be read either one bank at a time or
all 4 banks with one command.
Each bank of sensors have a VWETn pin available for
application of a voltage to supply pull up current to the
GND/Open sensor.
Interface to the digital subsystem is simple CMOS logic
inputs and outputs. The logic pins are compatible with 3.3V
logic allowing direct connection to a wide range of
microcontrollers or FPGAs.
APPLICATION
· Avionics Discrete to Digital Sensing
PIN CONFIGURATIONS
VWET0 - 1
SENSE_0 - 2
SENSE_1 - 3
SENSE_2 - 4
SENSE_3 - 5
SENSE_4 - 6
SENSE_5 - 7
SENSE_6 - 8
SENSE_7 - 9
SENSE_8-10
SENSE_9-11
HI-8436PQI
HI-8436PQT
HI-8436PQM
33 - SENSE_27
32 - VWET3
31 - SENSE_26
30 - SENSE_25
29 - SENSE_24
28 - SENSE_23
27 - SENSE_22
26 - SENSE_21
25 - SENSE_20
24 - SENSE_19
23 - SENSE_18
44 Pin Plastic Quad Flat Pack (PQFP)
10mm x 10mm
FEATURES
· Robust CMOS Silicon-on-Insulator (SOI) technology
· 32-channel Programmable Sense Operation,
GND/Open or Supply/Open, 4 X 8 Input Sensors
· Programmable HI/LO Threshold and Hysteresis in
0.1V steps, from 0.4V to 5.2V.
· Single Low Voltage Supply Operation for low
thresholds applications.
· Logic Operation from 3.0V to 3.6V
· 20 MHz Serial Peripheral Interface (SPI)
· Lightning Protected Sense Inputs
· Internal Self-Test
VWET0 - 1
SENSE_0 - 2
SENSE_1 - 3
SENSE_2 - 4
SENSE_3 - 5
SENSE_4 - 6
SENSE_5 - 7
SENSE_6 - 8
SENSE_7 - 9
SENSE_8 -10
SENSE_9 -11
HI-8436PCI
HI-8436PCT
HI-8436PCM
33 - SENSE_27
32 - VWET3
31 - SENSE_26
30 - SENSE_25
29 - SENSE_24
28 - SENSE_23
27 - SENSE_22
26 - SENSE_21
25 - SENSE_20
24 - SENSE_19
23 - SENSE_18
44 Pin Plastic QFN
7mm x 7mm
(DS8436 Rev. D)
HOLT INTEGRATED CIRCUITS
www.holtic.com
07/16
1 page  
HI-8436
Note: SPI Instruction op-codes not shown in Table 2 are
“reserved” and must not be used. Further, these op-codes will
not provide meaningful data in response to a read instruction.
Two instruction bytes cannot be “chained”; nCS must be
negated after each instruction, and then reasserted for the
following Read or Write instruction.
SCK
0 1234567 0 1234567
MSB
SI
High Z
SO
Op-Code Byte
LSB
MSB
nCS
Data Byte 0
LSB
High Z
FIGURE 5. Single-Byte Read From a Register
0 1234567 0 1234567 0 1234567
SCK
SPI Mode 0
MSB
SI
LSB MSB
LSB MSB
LSB
High Z
SO
Op-Code Byte
Data Byte 1
Data Byte 0
nCS
FIGURE 6. 2-Byte SPI Write Example
012345670123456701234567 01234567 01234567
SCK
SPI Mode 0
MSB
LSB MSB
LSB MSB
LSB MSB
LSB MSB
LSB
SI
High Z
SO
Op-Code Byte
Data Byte 3
Data Byte 2
Data Byte 1
Data Byte 0
nCS
FIGURE 7. 4-Byte SPI Read Example
HOLT INTEGRATED CIRCUITS
5
5 Page 
HI-8436
FUNCTIONAL DESCRIPTION
OVERVIEW
FUNCTION TABLE
Table 14. Function Table
The HI-8436 is comprised of 32 sensors arranged in 4
banks of 8 inputs, easily accessible via a four wire SPI
communication bus. Each bank of sensors can be
programmed as either GND/Open or Supply/Open. The
state of each sensor can be read out through the SPI.
The GND/Open high/low thresholds can be programmed
independently of the Supply/Open high/low thresholds.
Table 14 summarizes basic function selection and Table 16
gives more details on possible threshold values.
An internal test mode is available which sets the input to
each sensor comparator to the test value as programmed
by the Test Mode Data Register.
NOTE: Certain safety-critical flight applications require
periodic sensor testing or register re-programming during
flight. If programmable registers are periodically re-written,
the sensor inputs must be in a high or low state prior to and
during each re-programming cycle. See also section on Test
Mode.
SENSE_n
PSEN_n SO_n VWET_n
Open or > VTHI
L (GND/OPEN)
L
**
< VTLO
L (GND/OPEN)
H
**
Open or < VTLO
H (V+/OPEN)
H
open
> VTHI
H (V+/OPEN)
L
open
H = VLOGIC, L = GND
VTHI = Threshold Center Value + ½ Hsyteresis
VTLO = Threshold Center Value - ½ Hysteresis
**For GND/Open applications with thresholds > VLOGIC use VWETn
VWETn > VTHI/0.9 + 2.75V
PROGRAMMING THRESHOLDS
INITIALIZATION AND RESET
The HI-8436 generates a full reset upon application of
power. This power-on-reset (POR) sets all registers to their
default values.
The part can also be initialized to the full reset state by
applying a 100ns active low pulse to the external nMR pin.
A software reset is also possible via the SPI by writing a “1”
to CTRL<1>. This reset is the same as the full reset except
the part is held in the reset mode until the CTRL<1> bit is
written back to a “0”.
CONFIGURATION
The user configures the HI-8436 for specific applications by:
1) Programming the sensor type for each of the 4 banks.
2) Convert the required VTHI and VTLO into center and
hysteresis values as shown in example below.
3) For GND/Open sensors, VWETn must be set greater
than VTHI/0.9 + 2.75V.
The HI-8436’s on-chip DAC takes the 6-bit programmed
center and hysteresis values from the Threshold Center
Value and Hysteresis Registers (GOCENHYS and
SOCENHYS) and converts them to VTHI and VTLO
values. Maximum and minimum values may be found in
Table 16. The gain of the DAC is 0.1V per LSB.
VTHI = center value + ½ hysteresis
VTLO = center value - ½ hysteresis
To program the thresholds:
a) Select VTHI and VTLO.
b) Hysteresis = (VTHI - VTLO) / (0.2V/LSB)
c) Center Value = (VTHI - VTLO)/2 / (0.1V/LSB)
d) Program the register.
GND/OPEN SENSING
For GND/Open sensing, the PSENn bit is set to 0.
Referring to the Block Diagram, Figure 2, this selection will
connect a 3.3kΩ pull-up resistor through a diode to
VLOGIC. This resistor gives extra noise immunity for
detecting the open state while providing relay wetting
current. The user programs the desired
threshold/hysteresis levels and then determines the open
input voltage to set VWETn. To assist the internal pull up
current in GND/Open mode an external DC voltage of +7V
to +36V should be applied to the VWETn pin.
HOLT INTEGRATED CIRCUITS
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet HI-8436.PDF ] | |
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