DLPS133B June   2019  – July 2024 TPS99001-Q1

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  Electrical Characteristics—Analog to Digital Converter
    6. 5.6  Electrical Characteristics—Voltage Regulators
    7. 5.7  Electrical Characteristics—Temperature and Voltage Monitors
    8. 5.8  Electrical Characteristics—Current Consumption
    9. 5.9  Power-Up Timing Requirements
    10. 5.10 Power-Down Timing Requirements
    11. 5.11 Timing Requirements—Sequencer Clock
    12. 5.12 Timing Requirements—Host and Diagnostic Port SPI Interface
    13. 5.13 Timing Requirements—ADC Interface
    14. 5.14 Switching Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Analog to Digital Converter
        1. 6.3.1.1 Analog to Digital Converter Input Table
      2. 6.3.2 Power Sequencing and Monitoring
        1. 6.3.2.1 Power Monitoring
      3. 6.3.3 DMD Mirror Voltage Regulator
      4. 6.3.4 Low Dropout Regulators
      5. 6.3.5 System Monitoring Features
        1. 6.3.5.1 Windowed Watchdog Circuits
        2. 6.3.5.2 Die Temperature Monitors
        3. 6.3.5.3 External Clock Ratio Monitor
      6. 6.3.6 Communication Ports
        1. 6.3.6.1 Serial Peripheral Interface (SPI)
    4. 6.4 Device Functional Modes
      1. 6.4.1 OFF
      2. 6.4.2 STANDBY
      3. 6.4.3 POWERING_DMD
      4. 6.4.4 DISPLAY_RDY
      5. 6.4.5 PARKING
      6. 6.4.6 SHUTDOWN
    5. 6.5 Register Maps
      1. 6.5.1 System Status Registers
      2. 6.5.2 ADC Control
      3. 6.5.3 General Fault Status
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Headlight
        1. 7.2.1.1 Design Requirements
  9. 8 Power Supply Recommendations
    1. 8.1 TPS99001-Q1 Power Supply Architecture
    2. 8.2 TPS99001-Q1 Power Outputs
    3. 8.3 Power Supply Architecture
  10. 9 Layout
    1. 9.1 Layout Guidelines
      1. 9.1.1 Power/High Current Signals
      2. 9.1.2 Sensitive Analog Signals
      3. 9.1.3 High-Speed Digital Signals
      4. 9.1.4 Kelvin Sensing Connections
      5. 9.1.5 Ground Separation
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Third-Party Products Disclaimer
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

6.3.1 Analog to Digital Converter

The TPS99001-Q1 includes a 12-bit analog to digital converter block with a 32:1 input mux and dual sample-and-hold circuits. It also includes a custom high speed serial control interface which when used in tandem with the DLPC23x-Q1 provides up to 63 DMD sequence-aligned samples per frame, with hardware-based sample timing and shadow-latched results. The hardware sample timing and shadow latch relieves the DLPC23x-Q1 processor from ADC timing tasks, freeing up processor resources for other uses.

Figure 6-1 illustrates the structure of the ADC controller blocks .

TPS99001-Q1 ADC Subsystem Block Diagram Figure 6-1 ADC Subsystem Block Diagram

The ADC block contains a dedicated channel reserved for differential low-side LED current measurements. Two sample-and-hold circuits are included to support paired LED current/voltage measurements. An additional seven external ADC channels are supported. The remaining 24 multiplexer inputs enable measurement of internal TPS99001-Q1 operating parameters.

Note: When performing paired samples, they are sampled simultaneously, but converted sequentially, so the conversion time doubles.

The DLPC23x-Q1 contains a custom ADC control block that supports up to 63 ADC samples per frame. The samples are aligned with DMD sequencer activity, configurable through system configuration tools. This alignment makes measurement of specific light pulses (LED current and voltage) within a sequence possible, with precise repeatability from frame to frame. Up to 63 samples per frame are supported. The 63 sample buffer includes a shadow latch that updates each frame. This latched output is held constant for a complete frame time, allowing time for the DLPC23x-Q1 to collect and process the information.

A reference voltage output is also included in the ADC block. This provides a low current voltage reference which matches the reference used by the ADC for conversion. This external reference can be used to bias thermistor voltage dividers, providing greater accuracy than would be possible using a mix of external and internal references. Regardless of whether the reference voltage is used, a 0.1μF capacitor should be connected from this pin to ground.

Note: Current supply is limited. Loads which exceed the specified current maximum rating on ADC_VREF output may result in unpredictable ADC behavior.