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ISO1211 Fiches technique(PDF) 19 Page - Texas Instruments

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No de pièce ISO1211
Description  Isolated 24-V Digital Input Receivers for Digital Input Modules
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

ISO1211 Fiches technique(HTML) 19 Page - Texas Instruments

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ISO1211
IN
SENSE
OUT
FGND
Host
Controller
GND1
24 V
0 V
VCC1
VCC
GND
5 V or 3.3 V or 2.5 V
Backplane Supply
TVS
RSENSE
RTHR
Copyright © 2017, Texas Instruments Incorporated
19
ISO1211, ISO1212
www.ti.com
SLLSEY7 – JUNE 2017
Product Folder Links: ISO1211 ISO1212
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Typical Application (continued)
8.2.2.2 Surge, ESD and EFT Tests
Digital input modules are subject to surge (IEC 61000-4-5), electrostatic discharge or ESD (IEC 61000-4-2) and
electrical fast transient or EFT (IEC 61000-4-4) tests. The surge impulse waveform has the highest energy and
the widest pulse width, and is therefore the most stringent test of the three.
Figure 10 shows the application diagram for Type 1 and 3 systems. For a 1-kVPP surge test between the input
terminals and protection earth (PE), a value of 1 kΩ for RTHR and 10 nF for CIN is recommended. Table 3 lists a
summary of recommended component values to meet different levels of EMC requirements for Type 1 and 3
systems. A 2-nF capacitor between FGND and PE is assumed.
Table 3. Surge, IEC ESD and EFT, Test
IEC 61131-2
TYPE
RSENSE
RTH
CIN
SURGE
IEC ESD
IEC EFT
LINE TO PE
LINE TO LINE
LINE TO FGND
Type 1
562
3 kΩ
10 nF
±1 kV
±1 kV
±1 kV
±6 kV
±4 kV
Type 3
562
1 kΩ
10 nF
±1 kV
±1 kV
±500 kV
±6 kV
±4 kV
330 nF
±1 kV
±1 kV
±1 kV
±6 kV
±4 kV
For higher voltage levels of surge tests or for faster systems that cannot use a large value for CIN, TVS diodes or
varistors can be used to meet EMC requirements. Type 2 systems that use a smaller value for RTHR may also
require TVS diodes or varistors for surge protection. Figure 12 shows an example usage of TVS diodes for surge
protection. The recommended components for surge protection are CGA0603MLA-31900E (Varistor, Bourns),
SMF36A (TVS, Littelfuse) and GSOT36C (TVS, Vishay). Varistors are less-expensive alternatives to TVS diodes.
Figure 12. TVS Diodes Used Instead of a Filtering Capacitor for Surge Protection in Faster Systems
8.2.2.3 Multiplexing the Interface to the Host Controller
The ISO121x devices provide an output-enable pin on the controller side (EN). Setting the EN pin to 0 causes
the output buffers to be in the high-impedance state. This feature can be used to multiplex the outputs of multiple
ISO121x devices on the same host-controller input, reducing the number of pins on the host controller.
In the example shown in Figure 13, two sets of 8-channel inputs are multiplexed, reducing the number of input
pins required on the controller from 16 to 10. Similarly, if four sets of 8-channel inputs are multiplexed, the
number of pins on the controller is reduced from 32 to 12.


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