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Device Engineering

DEI1188 Datasheet Preview

DEI1188 Datasheet

8CH GND/OPEN DISCRETE INTERFACE IC W/ EXT HV PROTECTION

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Device
Engineering
Incorporated
385 East Alamo Drive
Chandler, AZ 85225
Phone: (480) 303-0822
Fax: (480) 303-0824
E-mail: admin@deiaz.com
DEI1188
8CH GND/OPEN DISCRETE
INTERFACE IC W/ EXT HV
PROTECTION
FEATURES
Eight discrete inputs
o Senses GND/OPEN discrete signals.
o Meet input threshold and hysteresis requirements specified per AirBus ABD0100H specification.
ƒ Thresholds: 4.5V/10.5V, Hysteresis: 3V
o 1mA input current to prevent dry relay contacts.
o Internal isolation diode.
o Uses external series 3Kohm resistors on inputs to implement lightning transient immunity of 1600V and higher.
i.e.: DO160E, Section 22, Levels 4 and 5.
o Inputs protected from Lightning Induced Transients per DO160E, Section 22, Cat A3 and B3 plus waveform 5A
to 500V.
Serial I/O interface to read data register
o Direct interface to Serial Peripheral Interface (SPI) port.
o TTL/CMOS compatible inputs and Tristate output
o 10MHz Max Data Rate
o Serial input to expand Shift Register
Pin compatible with DEI1066
Logic Supply Voltage (VCC):
3.3V +/-5%
Analog Supply Voltage (VDD):
12.0V to 16.5V
16L SOIC EP package
PIN ASSIGNMENTS
DIN1
DIN2
DIN3
DIN4
DIN5
DIN6
DIN7
DIN8
1
DEI1188
16 VDD
GND
VCC
GND
SDI
/CS
SCLK
SDO
Figure 1 DEI1188 Pin Assignment (16 Lead SOIC)
©2009 Device Engineering Inc.
1 of 12
DS-MW-01188-01 Rev. D
07/21/2009




Device Engineering

DEI1188 Datasheet Preview

DEI1188 Datasheet

8CH GND/OPEN DISCRETE INTERFACE IC W/ EXT HV PROTECTION

No Preview Available !

FUNCTIONAL DESCRIPTION
DEI1188 is an eight-channel discrete-to-digital interface IC implemented in an HV DIMOS technology. It senses eight
GND/OPEN discrete signals of the type commonly found in avionic systems and converts them to serial logic data. The
discrete data is read from the device via an eight-bit serial shift register with 3-state output. This serial interface is compatible
with the industry standard Serial Peripheral Interface (SPI) bus.
The discrete input circuits are designed to achieve a high level of lightning transient immunity. The application design
provides a series 3Kresistor on each discrete input to achieve DO160E Level 3 and WF5A 500V immunity. Higher
immunity levels can be achieved (i.e. Level 5) with the addition of a TVS between the resistor and the input pin.
PINS
1-8
9
10
11
12
13
14
15
16
NAME
DIN[1:8]
SDO
SCLK
/CS
SDI
GND
VCC
GND
VDD
Table 1 Pin Descriptions
DESCRIPTION
Discrete Inputs. Eight GND/OPEN discrete input signals.
Logic Output. Serial Data Output. This pin is the output from MSB (Bit
8) of the data shift register. It is clocked by the rising edge of SCLK.
This is a 3-state output enabled by /CS.
Logic Input. Serial Shift Clock. A low-to-high transition on this input
shifts data on the serial data input into Bit 1 of the selected data register.
The data shift register is shifted from Bit 1 to Bit 8. Bit 8 of the data
shift register is driven on DOUT.
Logic Input. Chip Select. A low level on this input enables the SDO 3-
state output and the data shift register. A high level on this input forces
DOUT to the high impedance state and disables the shift registers so
SCLK transitions have no effect. A high-to-low transition causes the
Discrete Input data to be loaded into the Data Register.
Logic Input. Serial Data Input. Data on this input is shifted into the LSB
(Bit 1) of the data shift register on the rising edge of the SCLK when /CS
input is low.
Logic/Signal Ground
Logic Supply Voltage. 3.3V+/-5%
Logic/Signal Ground
Analog Supply Voltage. 12V to 16.5V
ORDERING INFORMATION
Part Number
DEI1188-SMS
DEI1188-SES
Marking
DEI1188-SMS
DEI1188-SES
Package
16 EP SOIC
16 EP SOIC
Burn In
No
No
Temperature
-55 / +125 ºC
-55 / +85 ºC
DEI reserves the right to make changes to any products or specifications herein. DEI makes no warranty, representation, or
guarantee regarding suitability of its products for any particular purpose.
©2009 Device Engineering Inc.
2 of 12
DS-MW-01188-01 Rev. D
07/21/2009


Part Number DEI1188
Description 8CH GND/OPEN DISCRETE INTERFACE IC W/ EXT HV PROTECTION
Maker Device Engineering
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