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

4 Pin Configuration and Functions

Figure 4-1 ISO1228 DFB Package, 38-Pin SSOP (Top View)
Table 4-1 Pin Functions
PIN Type(1) DESCRIPTION
NO. NAME
1 IN1 I/O Field Input, Channel 1
2 LED1 I/O LED Indication Pin, Channel 1
3 IN2 I/O Field Input, Channel 2
4 LED2 I/O LED Indication Pin, Channel 2
5 IN3 I/O Field Input, Channel 3
6 LED3 I/O LED Indication Pin, Channel 3
7 AVSS — Field Side Negative Supply
8 IN4 I/O Field Input, Channel 4
9 LED4 I/O LED Indication Pin, Channel 4
10 IN5 I/O Field Input, Channel 5
11 LED5 I/O LED Indication Pin, Channel 5
12 IN6 I/O Field Input, Channel 6
13 LED6 I/O LED Indication Pin, Channel 6
14 IN7 I/O Field Input, Channel 7
15 LED7 I/O LED Indication Pin, Channel 7
16 AVCC — Field Side Power Supply
17 AVSS — Field Side Negative Supply
18 IN8 I/O Field Input, Channel 8
19 LED8 I/O LED Indication Pin, Channel 8
20 NC — Leave unconnected
21 GND1 — Logic Ground
22 NC — Leave unconnected
23 F1 I Digital Filter Setting
24 F0 I Digital Filter Setting
25 GND1 — Logic Ground
26 nFAULT O Open Drain Output. Connect 4.7kΩ pull-up to VCC1
27 OUT_EN I Output Enable. Output pins OUT1 through OUT8 are tri-stated if OUT_EN=0 or FLOAT
28 OUT8/SYNC O Synchronize data in Burst Mode(COMM_SEL=VCC1)

Data Output, Channel 8, in Parallel Interface Mode (COMM_SEL=0)
29 OUT7/BURST_EN I/O Burst Mode in Serial Interface Mode (COMM_SEL=VCC1)

Data Output, Channel 7, in Parallel Interface Mode (COMM_SEL=0)
30 OUT6/nRST I/O Active Low SPI Reset in Serial Interface Mode (COMM_SEL=VCC1)

Data Output, Channel 6, in Parallel Interface Mode (COMM_SEL=0)
31 OUT5/nINT O Active Low SPI Interrupt in Serial Interface Mode (COMM_SEL=VCC1)

Data Output, Channel 5, in Parallel Interface Mode (COMM_SEL=0)
32 OUT4/nCS I/O SPI Chip Select in Serial Interface Mode (COMM_SEL=VCC1)

Data Output, Channel 4, in Parallel Interface Mode (COMM_SEL=0)
33 OUT3/SCLK I/O SPI Clock in Serial Interface Mode (COMM_SEL=VCC1)

Data Output, Channel 3, in Parallel Interface Mode (COMM_SEL=0)
34 OUT2/SDI I/O SPI Input Data in Serial Interface Mode (COMM_SEL=VCC1)

Data Output, Channel 2, in Parallel Interface Mode (COMM_SEL=0)
35 OUT1/SDO O SPI Output Data in Serial Interface Mode (COMM_SEL=VCC1)

Data Output, Channel 1, in Parallel Interface Mode (COMM_SEL=0)
36 GND1 — Logic Ground
37 VCC1 — Logic Supply
38 COMM_SEL I Serial vs Parallel Interface selection

Serial Interface Mode if COMM_SEL=VCC1

Parallel Interface Mode if COMM_SEL=0 or Floating
(1) I = Input, O = Output, I/O = Input/Output