SLVSC26B November   2013  – May 2024 TPS61162A , TPS61163A

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
    1.     Pin 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 Electrical Characteristics
    6. 5.6 EasyScale Timing Requirements
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Boost Converter
      2. 6.3.2  IFBx Pin Unused
      3. 6.3.3  Enable and Start-up
      4. 6.3.4  Soft Start
      5. 6.3.5  Full-Scale Current Program
      6. 6.3.6  Brightness Control
      7. 6.3.7  Undervoltage Lockout
      8. 6.3.8  Overvoltage Protection
      9. 6.3.9  Overcurrent Protection
      10. 6.3.10 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 One-Wire Digital Interface (EasyScale Interface)
      2. 6.4.2 PWM Control Interface
    5. 6.5 Programming
      1. 6.5.1 EasyScale Programming
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Inductor Selection
        2. 7.2.2.2 Schottky Diode Selection
        3. 7.2.2.3 Compensation Capacitor Selection
        4. 7.2.2.4 Output Capacitor Selection
      3. 7.2.3 Application Curves
      4. 7.2.4 Additional Application Circuits
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
    2. 8.2 Related Links
    3. 8.3 Community Resources
    4. 8.4 Trademarks
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

6.4.1 One-Wire Digital Interface (EasyScale Interface)

The EN pin features a simple digital interface to allow digital brightness control. The digital dimming interface can save the processor power and battery life as it does not require PWM signals all the time, and the processor can enter idle mode if possible. In order to enable the EasyScale interface, the following conditions must be satisfied, and the specific digital pattern on the EN pin must be recognized by the device every time the TPS61162A, TPS61163A starts up from shutdown mode.

  1. VIN voltage is higher than UVLO threshold, and PWM pin is pulled high.
  2. Pull EN pin from low to high to enable the TPS61162A, TPS61163A. At this moment, the EasyScale detection window starts.
  3. After EasyScale detection delay time (tes_delay, 100µs), drive EN to low for more than EasyScale detection time (tes_detect, 260µs).

The third step must be finished before the EasyScale detection window (tes_win, 1ms) expires, and once this step is finished, the EasyScale interface is enabled, and the EasyScale communication can start. Refer to Figure 6-3 for a graphical explanation.

TPS61162A TPS61163A Easyscale Interface Detection Figure 6-3 Easyscale Interface Detection

The TPS61162A, TPS61163A support 9-bit brightness code programming. By the EasyScale interface, a master can program the 9-bit code D8(MSB) to D0(LSB) to any of 511 steps with a single command. The default code value of D8~D0 is “111111111” when the device is first enabled, and the programmed value will be stored in an internal register and set the dual-channel current according to Equation 2. The code will be reset to default value when the device is shut down or disabled.

Equation 2. TPS61162A TPS61163A

where

  • IFB_full: the full-scale LED current set by the RISET at ISET pin.
  • Code: the 9-bit brightness code D8~D0 programmed by EasyScale interface

When the one-wire digital interface at EN pin is selected, the PWM pin can be connected to either the VIN pin or a GPIO (refer to Section 7.2.4). If PWM pin is connected to VIN pin, EN pin alone can enable and disable the device — pulling EN pin low for more than 2.5ms disables the device; if PWM pin is connected to a GPIO, both PWM and EN signals should be high to enable the device, and either pulling EN pin low for more than 2.5ms or pulling PWM pin low for more than 20ms disables the device.