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PDF HI-8426 Data sheet ( Hoja de datos )
| Número de pieza | HI-8426 | |
| Descripción | Ground / Open Driver | |
| Fabricantes | HOLTIC | |
| Logotipo |  |
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November 2015
HI-8425, HI-8426
8-Channel, Ground /Open, or Supply / Open Sensor
4-channel 200 mA Ground / Open Driver
GENERAL DESCRIPTION
The HI-8425 is a combined 8-channel discrete-to-digital
sensor and quad low 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-8425 also offers four low side switches each
capable of sinking 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-8426 puts all of the features of the HI-8425 except
the individual Fault Detection Outputs, Tri-state pin
selection and fixed internal thresholds into a 32-pin Chip
Scale Package (QFN) which measures only 5mm x 5mm.
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.
· Airbus ABD0100H compliant sense inputs
· 4 Low-Side 200 mA drivers
· 4.5 Ohm On Resistance
· Over-Current Fault Detection Signaled by Logic Output
· Max Power Dissipation Automatically Limited by
Fault Protection
· Diode Clamps for Discharging Inductive Loads
APPLICATIONS
· Avionics Discrete to Digital Sensing
· Relay Driver
· Lamp driver
· Discrete Signaling
PIN CONFIGURATIONS
VWET - 1
SENSE0 - 2
SENSE1 - 3
SENSE2 - 4
SENSE3 - 5
SENSE4 - 6
SENSE5 - 7
SENSE6 - 8
SENSE7 - 9
OE - 10
HI-8425PCI
HI-8425PCT
HI-8425PCM
30 -
29 - FAULT_0
28 - DRV_0
27 - DRV_1
26 - FAULT_1
25 - GND
24 - FAULT_2
23 - DRV_2
22 - DRV_3
21 - FAULT_3
40 Pin Plastic 6mm x 6mm
Chip-scale package (QFN)
FEATURES
· Robust CMOS Silicon-on-Insulator (SOI) technology
· 8-channel Selectable Sense Operation, GND/Open
or Supply/Open
SENSE0 - 1
SENSE1 - 2
SENSE2 - 3
SENSE3 - 4
SENSE4 - 5
SENSE5 - 6
SENSE6 - 7
SENSE7 - 8
HI-8426PCI
HI-8426PCT
HI-8426PCM
24 - DSEL_3
23 - DRV0
22 - DRV1
21 - GND
20 - DRV_2
19 - DRV_3
18 - FAULT_OR
17 - GND
· Selectable Thresholds and Hysteresis
· Sense Detection Range 3V to 22V
· Logic Operation from 3.0V to 5.5V
· Lightning Protected Sense Inputs
(DS8425 Rev. F)
32 Pin Plastic 5mm x 5mm
Chip-scale package (QFN)
(See page 15 for leaded QFP package options)
HOLT INTEGRATED CIRCUITS
www.holtic.com
11/15
1 page  
HI-8425, HI-8426
FUNCTIONAL DESCRIPTION
Table 2. Configuration options and allowed threshold values -55C to 125C.
VLOGIC
VWET SNSE_ THS_
Pin SEL SEL
Operation
Threshold
Selected
Maximum
HI_SET
(VTHI =
HI_SETx10)
Minimum
LO_SET
(VTLO =
LO_SETx10)
Guaranteed
High
Threshold
Guaranteed
Low
Threshold
3.0V
OPEN
L
L GND/OPEN
Internal
-
-
2.5V
1.0V
3.6V
OPEN
L
L GND/OPEN
Internal
-
-
2.7V
1.0V
3.3V
28V
L
L GND/OPEN
Internal
-
-
2.55V
1.0V
3.0V
3.6V
7V L H GND/OPEN External 0.4V (4.0V) 0.3V (3.0V) VTHI + 0.5V VTLO - 0.5V
7V L H GND/OPEN External 0.4V (4.0V) 0.3V (3.0V) VTHI + 0.5V VTLO - 0.5V
3.0V to 3.6V 28V
L H GND/OPEN External 2.2V (22V) 0.3V (3.0V) VTHI + 0.5V VTLO - 0.5V
3.0V to 3.6V OPEN
H
L V+/OPEN
Internal
-
-
15.5V
11.0V
3.0V to 3.6V OPEN
H
H V+/OPEN
Exernal
2.2V (22V) 0.3V (3.0V) VTHI + 0.5V VTLO - 0.5V
4.5V
OPEN
L
L GND/OPEN
Internal
-
-
3.25V
1.0V
5.5V
5.0V
OPEN
28V
L
L
L GND/OPEN
L GND/OPEN
Internal
Internal
-
-
-
3.75V
1.0V
-
3.5V
1.0V
4.5V
7V L H GND/OPEN External 0.4V (4.0V) 0.3V (3.0V) VTHI + 0.5V VTLO - 0.5V
5.5V
7V L H GND/OPEN External 0.4V (4.0V) 0.3V (3.0V) VTHI + 0.5V VTLO - 0.5V
4.5V to 5.5V 28V
L H GND/OPEN External 2.2V (22V) 0.3V (3.0V) VTHI + 0.5V VTLO - 0.5V
4.5V to 5.5V OPEN
H
L V+/OPEN
Internal
-
-
15.5V
11.0V
4.5V to 5.5V OPEN H H V+/OPEN External 2.2V (22V) 0.3V (3.0V) VTHI + 0.5V VTLO - 0.5V
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-8425, tri-
states all Sense Outputs and Low 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.
OUTPUT DRIVERS
LOW SIDE DRIVERS
Both product versions offer four Low Side Drivers. Each
driver (NMOS switch) is capable of sinking a minimum of
200mA while exhibiting a Ron of 4.5Ω typical. 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.
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 GND. 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.
HOLT INTEGRATED CIRCUITS
5
5 Page 
HI-8425, HI-8426
D.C. ELECTRICAL CHARACTERISTICS (cont)
VDD = 3.3V or 5V, GND = 0V, TA = Operating Temperature Range (unless otherwise specified).
PARAMETER
SYMBOL
CONDITION
DISCRETE INPUTS
SENSE GND/OPEN
Resistance in series with diode to VLOGIC
Resistance in series with diode to VWET
Case 1: THS_SEL = GND
Ground State Input Voltage
Open State Input Voltage
RIN
RW
Internal Threshold Mode
VGS Input voltage to give High output
VOS Input voltage to give Low output
VDD = 5.5V
VDD = 3.0V
Input Current at 0V
Hysteresis
Case 2: THS_SEL = Open or VLOGIC
IIN28
VIN = 0V, VDD = 3.0V
VIN = 0V, VDD = 5.5V
VHY
HI_SET/LO_SET pins set Thresholds
HI_SET Threshold Range
VTHI HI Threshold is set to HI_SET X 10
MIN TYP MAX UNITS
3.3
23.8
kΩ
kΩ
1.0
3.75
2.5
0.15
-0.65
-1.65
V
V
mA
mA
V
0.4 2.2 V
LO_SET Threshold Range
Min Threshold Window
Sense Threshold Accuracy
VTLO
LO Threshold is set to LO_SET X 10
VTHW
HI_SET > LO_SET
Voltage referred to the sense input, see
table 2
0.3
0.1
VTLO - 25%
2.1 V
VTHI + 25%
V
V
LOGIC INPUTS
Input Voltage
Input Current, OE, DSEL_n
Input Current, THS_SEL
Input Current, SNSE_SEL
VIH Input Voltage HI
VIL Input Votage LO
ISINK VIN = VLOGIC, 30kΩ pull down
ISOURCE VIN = GND
ISINK
VIN = VLOGIC
ISOURCE VIN = GND , 30kΩ pull up
ISINK VIN = VLOGIC
ISOURCE VIN = GND,
80%
VLOGIC
20%
VLOGIC
125 μA
0.1 μA
0.1 μA
125 μA
0.1 μA
0.1 μA
HOLT INTEGRATED CIRCUITS
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet HI-8426.PDF ] | |
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