HI-8430, HI-8431
February 2018
8-Channel, Ground /Open, or Supply / Open Sensor
4-channel 200 mA Supply / Open Driver
·
Airbus ABD0100H compliant sense inputs
·
4 High-Side 200 mA Drivers
·
4.5 Ohm On Resistance VLOGIC Inputs Control 5V to
36V High Side Drivers
·
Over-Current Fault Detection Signaled by Logic Output
·
Max Power Dissipation Automatically Limited by Fault
Protection
·
Diode Clamps for Discharging Inductive Loads
GENERAL DESCRIPTION
The HI-8430 is a combined 8-channel discrete-to-digital
sensor and quad high side driver fabricated with Silicon-
on-Insulator (SOI) technology for robust latch-up free
operation. Sense detection can either be GND/Open or
Supply/Open as configured by the SNSE_SEL pin.
Supply/Open sensing is also referred to as 28V/Open
sensing. The sensing circuit window comparator
thresholds can be fixed at the internal programmed values
or can be set externally at the HI_SET and LO_SET pins,
as selected by the THS_SEL pin. The digital SENSE
outputs can be tri-stated by taking the OE pin high.
All sense inputs are internally lightning protected to
DO160G, Section 22, Cat AZ, BZ and ZZ without external
components.
The HI-8430 also offers four high side switches each
capable of sourcing 200 mA of current. Each switch
transistor is controlled by its own digital input pin and is fully
fault protected. Over-current conditions, such as a short
circuit, are detected and inhibited while signaling the fault
condition at the corresponding logic output. These four
FAULT outputs are also available in a combined OR output.
The outputs are fully protected from transients when
driving relays.
The HI-8431 is a smaller, reduced pin version of the HI-
8430 and is available in a 32-pin PQFP or 5mm x 5mm
QFN. It has all the features of the HI-8430 except the
individual fault detection outputs, tri-state pin selection and
fixed internal thresholds.
Interface to the digital subsystem is simple CMOS logic
inputs and outputs. The logic pins are compatible with 5V
or 3.3V logic allowing direct connection to a wide range of
microcontrollers or FPGAs.
APPLICATIONS
·
Avionics Discrete to Digital Sensing
·
Relay Driver
·
Lamp driver
·
Discrete Signaling
40 - VLOGIC
39 - THS_SEL
38 - HI_SET
37 - LO_SET
36 - SNSE_SEL
35 - FAULT_OR
34 - DSEL_0
33 - DSEL_1
32 - DSEL_2
31 - DSEL_3
PIN CONFIGURATIONS
VWET - 1
SENSE0 - 2
SENSE1 - 3
SENSE2 - 4
SENSE3 - 5
SENSE4 - 6
SENSE5 - 7
SENSE6 - 8
SENSE7 - 9
OE - 10
HI-8430PCI
HI-8430PCT
HI-8430PCM
30 -
29 - FAULT_0
28 - DRV_0
27 - DRV_1
26 - FAULT_1
25 - VDRV
24 - FAULT_2
23 - DRV_2
22 - DRV_3
21 - FAULT_3
40 Pin Plastic 6mm x 6mm
Chip-scale package
32 - VWET
31 - VLOGIC
30 - HI_SET
29 - LO_SET
28 - SNSE_SEL
27 - DSEL_0
26 - DSEL_1
25 - DSEL_2
SENSE0 - 1
SENSE1 - 2
SENSE2 - 3
SENSE3 - 4
SENSE4 - 5
SENSE5 - 6
SENSE6 - 7
SENSE7 - 8
SO_0 - 11
SO_1 - 12
SO_2 - 13
SO_3 - 14
SO_4 - 15
SO_5 - 16
SO_6 - 17
SO_7 - 18
GND - 19
- 20
FEATURES
·
Robust CMOS Silicon-on-Insulator (SOI) technology
·
8-channel Selectable Sense Operation, GND/Open
or Supply/Open
·
Selectable Thresholds and Hysteresis
·
Sense Detection Range 3V to 20V
·
Logic Operation from 3.0V to 5.5V
·
Lightning Protected Sense Inputs
·
Sense Inputs compliant to MIL-STD-704
HI-8431PCI
HI-8431PCT
HI-8431PCM
24 - DSEL_3
23 - DRV0
22 - DRV1
21 - VDRV
20 - DRV_2
19 - DRV_3
18 - FAULT_OR
17 - GND
32 Pin Plastic 5mm x 5mm
Chip-scale package
(See page 14 for leaded QFP package options)
HOLT INTEGRATED CIRCUITS
www.holtic.com
02/18
(DS8430 Rev. G)
SO_0
SO_1
SO_2
SO_3
SO_4
SO_5
SO_6
SO_7
-
-
-
-
-
-
-
-
9
10
11
12
13
14
15
16
HI-8430, HI-8431
BLOCK DIAGRAM
VLOGIC
VWET
V
LOGIC
THS_SEL
VREF_HI
VOLTAGE
REFERENCE
VREF_LO
VTHI/10
SNSE_SEL
HI_SET
LO_SET
VTLO/10
V
WET
V
LOGIC
SNSE_SEL
23.8k
+
-
29k
SENSE_0
SENSE_1
SENSE_2
SENSE_3
SENSE_4
SENSE_5
SENSE_6
SENSE_7
3.3k
LIGHTNING
PROTECTION
360k
40k
+
-
SNSE_SEL
SO_0
SO_1
SO_2
SO_3
SO_4
SO_5
SO_6
SO_7
OE
VDRV
Current
Sense
DSEL_0
DSEL_1
DSEL_2
DSEL_3
Drive
Control
DRV_0
DRV_1
DRV_2
DRV_3
FAULT_0
FAULT_1
FAULT_2
FAULT_3
FAULT_OR
GND
Figure 2
HOLT INTEGRATED CIRCUITS
2
HI-8430, HI-8431
PIN DESCRIPTIONS
SYMBOL
VWET
SENSE_0
SENSE_1
SENSE_2
SENSE_3
SENSE_4
SENSE_5
SENSE_6
SENSE_7
OE
SO_0
SO_1
SO_2
SO_3
SO_4
SO_5
SO_6
SO_7
GND
FAULT_3
DRV_3
VDRV
DRV_2
FAULT_2
FAULT_1
DRV_1
DRV_0
FAULT_0
DSEL_3
DSEL_2
DSEL_1
DSEL_0
SNSE_SEL
LO_SET
HI_SET
THS_SEL
VLOGIC
FUNCTION
Supply
Discrete Input
Discrete Input
Discrete Input
Discrete Input
Discrete Input
Discrete Input
Discrete Input
Discrete Input
Digital Input
Digital output
Digital output
Digital output
Digital output
Digital output
Digital output
Digital output
Digital output
Supply
Digital output
Switch Output
Supply
Switch Output
Digital output
Digital output
Switch Output
Switch Output
Digital output
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Analog input
Analog input
Digital Input
Supply
DESCRIPTION
Optional input to supply relay wetting current to sense lines in GND/Open operation
50kΩ To GND
Discrete input 0. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open
Discrete input 1. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open
Discrete input 2. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open
Discrete input 3. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open
Discrete input 4. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open
Discrete input 5. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open
Discrete input 6. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open
Discrete input 7. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open
If High, SO_n outputs are high-impedance. OE has internal 30kΩ pull-down resistor
High if SNSE_SEL=0 and SENSE_0 < V
LO
, or Low if SNSE_SEL=1 and SENSE_0 > V
HI
High if SNSE_SEL=0 and SENSE_1 < V
LO
, or Low if SNSE_SEL=1 and SENSE_1 > V
HI
High if SNSE_SEL=0 and SENSE_2 < V
LO
, or Low if SNSE_SEL=1 and SENSE_2 > V
HI
High if SNSE_SEL=0 and SENSE_3 < V
LO
, or Low if SNSE_SEL=1 and SENSE_3 > V
HI
High if SNSE_SEL=0 and SENSE_4 < V
LO
, or Low if SNSE_SEL=1 and SENSE_4 > V
HI
High if SNSE_SEL=0 and SENSE_5 < V
LO
, or Low if SNSE_SEL=1 and SENSE_5 > V
HI
High if SNSE_SEL=0 and SENSE_6 < V
LO
, or Low if SNSE_SEL=1 and SENSE_6 > V
HI
High if SNSE_SEL=0 and SENSE_7 < V
LO
, or Low if SNSE_SEL=1 and SENSE_7 > V
HI
Reference, 0V
High if Driver 3 is attempting to source excess current
Drain node of high switch driver 3
Supply for DRV_0-3. The VDRV pin and the isolated backside pad should be connected for optimum
performance and power dissipation.
Drain node of high switch driver 2
High if Driver 2 is attempting to source excess current
High if Driver 1 is attempting to source excess current
Drain node of high switch driver 1
Drain node of high switch driver 0
High if Driver 0 is attempting to source excess current
When high, turns on Driver 3. DSEL_3 has an internal 30kΩ pull-down resistor
When high, turns on Driver 2. DSEL_2 has an internal 30kΩ pull-down resistor
When high, turns on Driver 1. DSEL_1 has an internal 30kΩ pull-down resistor
When high, turns on Driver 0. DSEL_0 has an internal 30kΩ pull-down resistor
High if any Driver is attempting to source excess current
If Low, SENSE pins are sensing Open/Gnd. If High, SENSE pins are sensing SUPPLY/Open
If THS_SEL is High, this pin sets the lower window comparator threshold
If THS_SEL is High, this pin sets the upper window comparator threshold
If THS_SEL is Low, comparator thresholds are set internally. THS_SEL has an internal 30kΩ pull-up
Logic supply. (3.0V - 5.5V)
FAULT_OR Digital Output
HOLT INTEGRATED CIRCUITS
3
HI-8430, HI-8431
FUNCTIONAL DESCRIPTION
SENSING
The 8 Sense Channels can be configured to meet the
requirements of a variety of conditions and applications.
Table 1 summarizes basic function selection and Table 2
gives more details on possible threshold values.
WETTING CURRENT
For GND/Open applications with VWET open, the wetting
current with the input voltage at GND is simply (VLOGIC -
0.75)/3.3k. When applying a voltage at the VWET pin the
wetting current is (VLOGIC - 0.75)/3.3k + (VWET -
4.2)/127k. Additional wetting current can be achieved by
placing an external resistor and a diode between VWET
and the individual sense inputs.
GND/OPEN SENSING
For GND/Open sensing, the SNS_SEL pin is connected to
GND. Referring to the Block Diagram, Figure 2, this selection
will connect a 3.3kΩ pull-up resistor through a diode to
VLOGIC and a 23.8kΩ resistor through 3 diodes to VWET.
These resistors give extra noise immunity for detecting the
open state while providing relay wetting current. Configuring
THS_SEL, HI_SET/LO_SET and VWET as described below
sets the window comparator thresholds, V
THI
and V
TLO
, the
input voltage when open, and the input current.
HI-8430 (40 pin version) - THRESHOLD SELECT
The HI-8430 offers a choice between internally fixed
thresholds or external thresholds provided by the user.
With THS_SEL set to GND, the window comparator
thresholds are fixed based on an internal reference. The high
threshold, V
THI
, and the low threshold, V
TLO
levels may be
found in Table 2. When the internal references are used the
HI_SET and LO_SET pins should be connected to GND.
For applications with either large GND offsets or thresholds
higher than VLOGIC - 0.75V, THS_SEL is set high and the
thresholds are set externally, for example by a simple
resistor divider off the VLOGIC supply. In this case V
THI
is
equal to 10X the voltage on the HI_SET pin. V
TLO
is equal to
10X the voltage on the LO_SET pin. This mode allows the
user complete flexibility to define the thresholds and
hysteresis levels.
HI-8431 (32 pin version) THRESHOLD SELECT
For applications that can take advantage of the very small 32
pin chip scale package of the HI-8431, THS_SEL is not
available and an internal pull-up makes it mandatory to
supply HI_SET and LO_SET externally.
OPEN INPUT VOLTAGE
SUPPLY/OPEN SENSING
The 8 Sense Channels can be configured to sense
Supply/Open by connecting the SNSE_SEL pin to
VLOGIC. Refering to Figure 2, a 32kΩ resistor is switched
in series to provide a pull down in addition to the 400kΩ of
the comparator input divider to GND. Similar to the
GND/Open case configuring THS_SEL, HI_SET/LO_SET
and VWET as described below sets the window compara-
tor thresholds, the open input voltage when open and the
wetting current.
THRESHOLD SELECT
The threshold selections are handled in the same way as
stated above for the GND/OPEN case.
For THS_SEL set low, the internal reference nominally
sets the window comparator. See table 2 for the V
THI
and
V
TLO
threshold levels.
For THS_SEL set high, the final thresholds are 10X the
voltage set on the HI_SET and LO_SET pins. The VWET
pin must be left open in the Supply/Open sensing case.
WETTING CURRENT
For the Supply/Open case the wetting current into the
sense input is the current sunk by the effective 28kΩ to
GND. For V
SENSE_n
= 28V, I
WET
is 1ma. See Figure 12.
Table 1. Function Table
SENSE_n
Open or > VTHI
L
L
L
H
H
H
SNSE_SEL
(GND/OPEN)
(GND/OPEN)
(GND/OPEN)
(V+/OPEN)
(V+/OPEN)
(V+/OPEN)
OE
L
L
H
L
L
H
SO_n
L
H
Z
H
L
Z
For correct operation, the V
SENSE_n
when open, must be
higher than V
THI
so SO_n will be low.
NOTE 1:
In the case of 3.3V VLOGIC operation, VWET must
be connected to a supply greater than (1.3 x VTHI + 2.25V)
to fulfill the above condition. In the case of 5V operation, the
above condition may be satisfied with VWET left open (see
table 2). In this case, the input floats to V
SENSE_n
= VLOGIC -
0.75V.
NOTE 2:
Various ARINC standards such as ARINC 763
define the standard “Open” signal as characterized by a
resistance of 100kΩ or more with respect to signal common.
The user should consider this 100kΩ to ground case when
setting the thresholds.
< VTLO
X
Open or < VTLO
> VTHI
X
H = VLOGIC, L = GND, Z = Hi-Z, X = Don’t Care, V+ = V
SUPPLY
See Table 2 for values of VTHI/VTLO
HOLT INTEGRATED CIRCUITS
4
HI-8430, HI-8431
FUNCTIONAL DESCRIPTION
Table 2. Configuration options and allowed threshold values -55C to 125C.
VLOGIC
VWET
Pin
SNSE_ THS_
SEL
SEL
Operation
Threshold
Selected
Maximum
HI_SET
(VTHI =
HI_SETx10)
-
-
-
0.4V (4.0V)
2.0V (20V)
-
2.2V (22V)
-
-
-
0.4V (4.0V)
2.0V (20V)
-
2.2V (22V)
Minimum
LO_SET
(VTLO =
LO_SETx10)
-
-
-
0.3V (3.0V)
0.3V (3.0V)
-
0.3V (3.0V)
-
-
-
0.3V (3.0V)
0.3V (3.0V)
-
0.3V (3.0V)
Guaranteed
High
Threshold
3.0V
3.25V
3.0V
VTHI + 25%
VTHI + 25%
18.0V
VTHI + 25%
3.5V
4.0V
4.0V
VTHI + 25%
VTHI + 25%
18.0V
VTHI + 25%
Guaranteed
Low
Threshold
1.0V
1.0V
1.0V
VTLO - 25%
VTLO - 25%
9.0V
VTLO - 25%
1.0V
1.0V
1.0V
VTLO - 25%
VTLO - 25%
9.0V
VTLO - 25%
3.0V
3.6V
3.3V
3.0V to 3.6V
3.0V to 3.6V
3.0V to 3.6V
3.0V to 3.6V
4.5V
5.5V
5.0V
4.5V to 5.5V
4.5V to 5.5V
4.5V to 5.5V
4.5V to 5.5V
8V
8V
28V
8V
28V
OPEN
OPEN
OPEN
OPEN
28V
7V
28V
OPEN
OPEN
L
L
L
L
L
H
H
L
L
L
L
L
H
H
L
L
L
H
H
L
H
L
L
L
H
H
L
H
GND/OPEN
GND/OPEN
GND/OPEN
GND/OPEN
GND/OPEN
V+/OPEN
V+/OPEN
GND/OPEN
GND/OPEN
GND/OPEN
GND/OPEN
GND/OPEN
V+/OPEN
V+/OPEN
Internal
Internal
Internal
External
External
Internal
Exernal
Internal
Internal
Internal
External
External
Internal
External
NOTE:
VTHI = Sense pin high threshold (HI_SET x 10), VTLO = Sense pin low threshold (LO_SET x 10)
OUTPUT ENABLE
The output enable pin, OE, available on the HI-8430, tri-
states all Sense Outputs and High Side Driver Fault Outputs
to allow connecting the tri-state outputs in parallel with other
tri-stated chips. The OE pin has a pull-down and when left
open will cause these digital outputs to be driven to their logic
levels. If the OE pin is High, these digital outputs are high
impedance.
OVER-CURRENT SHUTDOWN
Maximum DC power dissipation per driver is
approximately 0.5W at room temperature. Conditions that
would cause the power to exceed this amount will result in
a shut down of the driver. Over-current shutdown is
initiated when the driver pin voltage is more than
approximately 1.5V from the VDRV rail. However there is a
delay of approximately 11µsec before the shutdown
actually occurs giving the driver an opportunity to charge
capacitive loads and thereby avoid shutdown. Similarly, if
the driver is on and a high load is suddenly switched on,
the over-current shutdown will be delayed in activation.
Note that even when the over-current fault condition is
present, the driver pin is still sourcing a few milliamps. This
low current condition continues until the input is taken low
or the load is removed.
FAULT CONDITIONS
Each driver has a converter that translates an over-current
detection into a logic high output at its FAULT output. The
FAULT_OR output goes high if one or more FAULT outputs
are high. These outputs can be tri-stated by setting OE
high.
OUTPUT DRIVERS
HIGH SIDE DRIVERS
Both product versions offer four High Side Drivers. Each
driver (PMOS switch) is capable of sourcing a minimum of
200mA while exhibiting a R
on
of 4.5Ω typical. VDRV, the high
side rail, may range from 5V to 36V independent of VLOGIC,
which may range from 3V to 5.5V. Each output has diode
clamps for protection during inductive kick-back for relay
applications. Off-state leakage is typically less than 10nA at
room temperature. The inputs, DSEL0 through DSEL3, have
internal pull-downs which hold off the drivers until logic highs
are presented.
HOLT INTEGRATED CIRCUITS
5
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