SNAS806 September   2020 TPL1401

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics
    6. 6.6  Timing Requirements: I2C Standard Mode
    7. 6.7  Timing Requirements: I2C Fast Mode
    8. 6.8  Timing Requirements: I2C Fast Mode Plus
    9. 6.9  Typical Characteristics: VDD = 1.8 V (Reference = VDD) or VDD = 2 V (Internal Reference)
    10. 6.10 Typical Characteristics: VDD = 5.5 V (Reference = VDD) or VDD = 5 V (Internal Reference)
    11. 6.11 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Digital Potentiometer (Digipot) Architecture
        1. 7.3.1.1 Reference Selection and Digipot Transfer Function
          1. 7.3.1.1.1 Power Supply as Reference
          2. 7.3.1.1.2 Internal Reference
      2. 7.3.2 Digipot Update
      3. 7.3.3 Nonvolatile Memory (EEPROM or NVM)
        1. 7.3.3.1 NVM Cyclic Redundancy Check
          1. 7.3.3.1.1 NVM_CRC_ALARM_USER Bit
          2. 7.3.3.1.2 NVM_CRC_ALARM_INTERNAL Bit
      4. 7.3.4 Power-On Reset (POR)
      5. 7.3.5 Software Reset
      6. 7.3.6 Device Lock Feature
    4. 7.4 Device Functional Modes
      1. 7.4.1 Power Down Mode
    5. 7.5 Programming
      1. 7.5.1 F/S Mode Protocol
      2. 7.5.2 I2C Update Sequence
      3. 7.5.3 Address Byte
      4. 7.5.4 Command Byte
      5. 7.5.5 I2C Read Sequence
    6. 7.6 Register Map
      1. 7.6.1 STATUS Register (address = D0h) (reset = 000Ch or 0014h)
      2. 7.6.2 GENERAL_CONFIG Register (address = D1h) (reset = 01F0h)
      3. 7.6.3 PROTECT Register (address = D3h) (reset = 0008h)
      4. 7.6.4 DPOT_POSITION Register (address = 21h) (reset = 0000h)
      5. 7.6.5 USER_BYTE1 Register (address = 25h) (reset = 0000h)
      6. 7.6.6 USER_BYTE2 Register (address = 26h) (reset = 0000h)
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 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
  12. 12Mechanical, Packaging, and Orderable Information

8.2 Typical Application

Many analog and power devices, such as LED drivers, power amplifiers, high-side switches, e-fuses, and DC-DC converters, provide an analog input for an adjustable output current limit. Some of these devices recommend a resistor from this pin to ground for static settings. The TPL1401 is a very compact way to address the adjustable current limit requirements of such devices enabling scalability and configurability of these power devices. The integrated EEPROM makes sure the setting is retained even after power cycling, allowing the current limit to work without a processor. This section explains the design details of a programmable current limit application with an example LED driver, the TPS92692. Figure 8-1 shows the simplified circuit diagram of this application.

Figure 8-1 Programmable Current Limit