SLLSFN5A June   2023  – February 2024 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 Interface Timing - Non-Daisy Chain
      9. 7.3.9  SPI Interface Timing - Daisy Chain
      10. 7.3.10 SPI Interface 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 Design Requirements
        1. 8.2.3.1 Detailed Design Procedure
          1. 8.2.3.1.1 Current Limit
          2. 8.2.3.1.2 Voltage Thresholds
          3. 8.2.3.1.3 Wire-Break Detection
  10. 9 Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information
    1. 13.1 Tape and Reel Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information
8.2.3.1.2 Voltage Thresholds

The RTHR resistor sets the voltage thresholds (VIL and VIH) as well as limits the surge current. A value of 1kΩ is recommended for RTHR in Type 3 systems for IL of 2.5mA (typical) and 910Ω for IL of 3.5mA (typical) in sink mode (maximum threshold voltage required is 11V). IL of 3.5mA is not supported in source mode for Type 2 and Type 3 systems. A value of 1kΩ is recommended for RTHR in Type 1 systems (maximum threshold voltage required is 15V) and a value of 910Ω is recommended for RTHR in Type 2 systems. The Table 8-1 and Source Mode RTHR Admissible Values (Ω) tables list range of RTHR values applicable for each mode. Use Equation 6 and Equation 3 to calculate the values for the typical VIH values and minimum VIL values, respectively.

Equation 2. VIH (typical) = 6.0 V + RTHR x IL (typical)
Equation 3. VIL (typical) = 5.0 V + RTHR x IL (typical)
Equation 4. VIH (max) = 6.4 V + RTHR x IL (max)
Equation 5. VIL (min) = 4.7 V + RTHR x IL (min)

Refer to the tables for RTHR values to achieve IEC 61131-2 Type 1, 2, 3 voltage thresholds. For Type 2 operation, it is recommended to use two channels in parallel, with RILIM = 1 kΩ and RPAR = 9.76 kΩ operation in sink mode, resulting in a current limit of 7 mA (typical). RTHR values can be same as Type 3 operation in this mode.

Table 8-1 Sink Mode RTHR Admissible Values (Ω)
SINK MODE
RILIM = 0Ω, RPAR = 13kΩ, RSURGE = 1kΩ, (IL = 2.5mA)RILIM = 1kΩ, RPAR = 9.76kΩ, RSURGE = 1kΩ, (IL = 3.5mA)
MinTypicalMaxMinTypicalMax
Type 118010002400Type 11109101740
Type 318010001300Type 3110910930
Table 8-2 Source Mode RTHR Admissible Values (Ω)
SOURCE MODE
RILIM = 0Ω, RPAR = 13kΩ (IL = 2.5mA)RILIM = 1kΩ, RPAR = 9.76kΩ, (IL = 3.5mA)
MinTypicalMaxMinTypicalMax
Type 118010002400Type 1200020002000
Type 318010001300Type 3Not Supported

A tolerance of 5% is acceptable on RTHR. Surge resistant resistors is recommended for RTHR.

The values in the tables are back calculated from the VIH and VIL formulae mentioned above.

For example;

IEC 61131-2 Type 1 Sink Mode threshold calculations with RILIM. = 0kΩ,

VOFF_MAX (5V) < VIL(min) , VON_MIN (15V) > VIH(max), IL(min) = 2mA and IL(max) = 3.3mA,

Switching close to OFF state: VOFF_MAX =VIL(min): 5V = 4.7 V + RTHR x IL(min) => RTHR = 150Ω

With RTHR = 150Ω, VON = VIH(max) = 6.4V + 150Ω x IL(max) = 6.895V which is less than VON_MIN

( 180Ω in the table is a standard resistor to accommodate for 5% tolerance on RTHR)

Switching close to ON state: VON_MIN =VIH(max): 15V = 6.4V+ RTHR x IL(max) => RTHR = 2.6kΩ

With RTHR = 2.6kΩ, VOFF = VIL = 6.4 V + 2.6kΩ x IL(min) = 9.9V which is greater than VOFF_MAX

( 2400Ω in the table is a standard resistor to accommodate for 5% tolerance on RTHR)

Similarly, other values in the table are derived.