Calculation tool
ISO1228-CALC — ISO1228 sink source threshold calculator
ISO1228 calculator for calculating voltage thresholds and resistor values for IEC 61131-2 standard
ISO1228
Eight-channel isolated 24-V to 36-V digital input receiver with current limiting and LED indication
Data sheet
ISO1228
- Configurable IEC 61131-2 eight Type 1/3 or four Type 2 Isolated Digital Inputs
- Low Power and Heat Dissipation
- Selectable input current limit
- Fieldside LED drivers using input current
- Configurable sinking or sourcing type inputs
- Wire-break detection in sink mode
- Integrated field-side power loss detection
- Programmable Glitch Filters
- Built in CRC check across barrier
- Serial SPI and Parallel output options
- Supports SPI daisy chaining
- Supports SPI burst mode
- Integrated IEC ESD and Surge Protection
- High CMTI(Typ): 75kV/µs
- VCC1 Logic supply voltage range: 1.71V to 5.5V
- AVCC field supply voltage range (sink mode): 8.5V to 36V
- AVCC field supply voltage range (source mode): 13V to 36V
- Ambient temperature range: –40°C to 125°C
- Small Footprint 38-SSOP Package
- Safety-related certifications:
- 4242-VPK VIOTM and 637-VPK VIORM per DIN EN IEC 60747-17 (VDE 0884-17)
- 3000-VRMS Isolation for 1 Minute per UL 1577
- IEC 62368-1, IEC 61010-1 Certifications
- All Certifications Planned
The ISO1228 is an eight-channel isolated 24V digital input receiver, configurable to IEC 61131-2 Type 1, and 3 characteristics or four-channel Type 2 characteristics. The ISO1228 includes resistor-programmable accurate current limit and field side input-current-powered LED indication to reduce system power dissipation and reduce board temperatures. ISO1228 can be configured for either sourcing or sinking type digital inputs with minimal hardware change. Both serial SPI and parallel output modes are available. Wire-break detection, fieldside supply monitoring and built-in CRC across barriers help improve system reliability. In-built glitch filters and integrated IEC-ESD and surge protection help to achieve a robust design.
The ISO1228 operates over the logic supply range of 1.71V to 5.5V, supporting 1.8V, 2.5-V, 3.3V, and 5V controllers. Field side output voltage range supported is 8.5V to 36V in sink mode and 13V to 36V in source mode.ISO1228 supports up to 1.5Mbps data rates passing a minimum pulse width of 667ns for high-speed operation.
Technical documentation
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View all 7 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | ISO1228 Eight-Channel Isolated Digital Input with Current Limit and Diagnostics datasheet (Rev. A) | PDF | HTML | 09 Jan 2024 |
| Application brief | Space-Saving Design Techniques for Multichannel High-Voltage Digital Input Modules (Rev. C) | PDF | HTML | 11 Nov 2024 | |
| EVM User's guide | ISO228 Eight-Channel Isolated Digital Input Sink/Source Evaluation Module User's Guide | PDF | HTML | 10 Sep 2024 | |
| Application brief | Digital Input Module, Digital Output Module | PDF | HTML | 06 Mar 2024 | |
| EVM User's guide | ISO1228, ISO1228DFBEVM Eight-Channel Isolated Digital Input with Current Limit | PDF | HTML | 06 Jul 2023 | |
| Certificate | ISO1228DFBEVM EU RoHS Declaration of Conformity (DoC) | 13 Apr 2023 | ||
| Application brief | How To Simplify Isolated 24-V PLC Digital Input Module Designs (Rev. B) | 14 Mar 2018 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
ISO1228DFBEVM — ISO1228 evaluation module for 8-channel isolated digital inputs in sink mode
ISO1228DFBEVM is an evaluation module (EVM) used to evaluate the 8-channel isolated digital input receiver ISO1228 in the 38-pin DFB SSOP package. The EVM has additional footprints that gives the user flexibility to add componenents to test a variety of common applications. The EVM features (...)
Evaluation board
ISO1228EVM — ISO1228 evaluation module for 8-channel isolated digital inputs in sink/source mode
ISO1228EVM is an evaluation module (EVM) used to evaluate the eight-channel isolated digital input receiver ISO1228 in the 38-pin DFB SSOP package configured for sink/source mode. The EVM has additional footprints that gives the user flexibility to add componenents to test a variety of common (...)
Simulation tool
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SSOP (DFB) | 38 | Ultra Librarian |
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