SLLSFN5B June   2023  – September 2025 ISO1228

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Power Ratings
    6. 5.6  Insulation Specifications
    7. 5.7  Safety-Related Certifications
    8. 5.8  Safety Limiting Values
    9. 5.9  Electrical Characteristics—DC Specification
    10. 5.10 Switching Characteristics—AC Specification
    11. 5.11 Typical Characteristics
  7. 6 Parameter Measurement Information
    1. 6.1 Test Circuits
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Surge Protection
      2. 7.3.2  Field Side LED Indication
      3. 7.3.3  Serial and Parallel Output option
      4. 7.3.4  Cyclic Redundancy Check (CRC)
      5. 7.3.5  FAULT Indication
      6. 7.3.6  Digital Low Pass Filter
      7. 7.3.7  SPI Register Map
      8. 7.3.8  SPI Timing - Non-Daisy Chain
      9. 7.3.9  SPI Timing - Daisy Chain
      10. 7.3.10 SPI Timing - Burst Mode
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Sinking Type Digital Inputs
      2. 8.2.2 Sourcing Type Digital Inputs
      3. 8.2.3 Sink/Source Type Digital Inputs
      4. 8.2.4 Design Requirements
        1. 8.2.4.1 Detailed Design Procedure
          1. 8.2.4.1.1 Current Limit
          2. 8.2.4.1.2 Voltage Thresholds
          3. 8.2.4.1.3 Wire-Break Detection
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.4 Device Functional Modes

Table 7-1 lists the functional modes for the ISO1228 device.

Table 7-1 Function Table
AVCC SUPPLY(1) VCC1 SUPPLY INPUT
(INx)		 OUTPUT ENABLE
(OUT_EN)		 OUTPUT
(OUTx)(2)		 COMMENTS
PU PU H H H Channel output assumes the logic state of channel input.
L H L
Open H L When INx is open, the output of the corresponding channel goes to Low.
X L Undetermined All channel outputs are tri-stated.
PD PU X H L Channel output is low if AVCC is not previously in powered state
X H H/L Channel output is last state if AVCC is previously powered state.
X L Undetermined All channel outputs are tri-stated.
PU PD X X Undetermined When VCC1 is unpowered, a channel output is undetermined. When VCC1 transitions from unpowered to powered up; a channel output assumes the logic state of the input.
PD PD
(1) AVCC = Field side power supply; PU = Powered up (AVCC ≥ 8.5V for sink mode and AVCC ≥ 13V for source mode); PD = Powered down (VCC1 ≤ 1.7V); X = Irrelevant; H = High level; L = Low level; Z = High impedance
(2) The outputs are in an undetermined state when VCC1< 1.71V.