SLAT163 July   2024 AFE43902-Q1 , AFE439A2 , AFE53902-Q1 , AFE539A4 , AFE539F1-Q1 , AFE639D2 , DAC43204 , DAC43401 , DAC43401-Q1 , DAC43701 , DAC43701-Q1 , DAC43901-Q1 , DAC43902-Q1 , DAC53001 , DAC53002 , DAC53004 , DAC53004W , DAC53202 , DAC53204 , DAC53204-Q1 , DAC53204W , DAC53401 , DAC53401-Q1 , DAC53701-Q1 , DAC539E4W , DAC539G2-Q1 , DAC63001 , DAC63002 , DAC63004 , DAC63004W , DAC63202 , DAC63202W , DAC63204 , DAC63204-Q1 , DAC63204W

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1What is a Smart DAC?
  5. 2What is a Smart Analog Front End (AFE)?
  6. 3Smart DAC selection guide
  7. 4Smart AFE Selection Guide
  8. 5Applications
    1. 5.1 Lightning
      1. 5.1.1 Light Emitting Diode (LED) Biasing and Linear Fade-In Fade-Out
      2. 5.1.2 LED Biasing With LED Driver
      3. 5.1.3 Analog Thermal Foldback
        1. 5.1.3.1 Single Slope Thermal Foldback
        2. 5.1.3.2 Multi-Slope Thermal Foldback
      4. 5.1.4 Logarithmic Fade-In/Fade-Out
      5. 5.1.5 LED Sequencing
    2. 5.2 Control
      1. 5.2.1 Voltage Margining and Scaling With Voltage Output Smart DAC
      2. 5.2.2 Thermoelectric Cooling (TEC) Control
        1. 5.2.2.1 TEC Control Using DC/DC Driver
        2. 5.2.2.2 TEC control using h-Bridge driver
      3. 5.2.3 Analog Power Control (APC) of a Laser
      4. 5.2.4 Constant Power Control
    3. 5.3 Microcontroller Independent Fault Management and Communication
      1. 5.3.1 Programmable Comparator Using Smart DAC
      2. 5.3.2 GPI-to-PWM
      3. 5.3.3 If-Then-Else Logic
    4. 5.4 Driver
      1. 5.4.1 Lens Positioning Control for Camera Module Auto-Focus and Image Stabilization
      2. 5.4.2 Laser Drive
    5. 5.5 Miscellaneous Smart DAC Applications
      1. 5.5.1 Software-less Medical Alarm Generation
      2. 5.5.2 555 Timer

5.3.2 GPI-to-PWM

To gather and communicate simple faults from system to system often times require software implementation. Take rear lighting of a car as an example: there are a few LED drivers which output digital fault signals which needs to be somehow communicate to the main processor located in the front of the car. To do so, another micro-controller is normally utilized.

DAC539G2-Q1 provides software-free way to solve this kind of problem. The device takes 3 GPIs as an input. The input is mapped in the internal LUT to the corresponding PWM duty cycle signal. For example: if input is 0 0 0, the output PWM is 100% duty cycle, if input is 0 0 1, the output PWM is 87.5% duty cycle, and so on. Hence, up to 8 different fault condition can be monitored and communicated. As the output is PWM duty cycle is modulated, such communication only requires a single wire and can be transmitted across 3-5 meters. GPI-to-duty cycle relationship is fully customizable within device LUT and can be stored in the device non-volatile memory for software-free operation.

Table 5-13 Design Implementation
Hardware Block DiagramFigure 5-13 Hardware Block Diagram
Design BenefitsSuggested device
  • Up to 8 different fault signals that can be transmitted
  • Mode pin to select between digital interface and stand alone mode
  • Medium length (3-5m) software-less fault management and communication
  • NVM to store all configurations
End EquipmentDesign help