TIDUDT4A May   2018  – November 2021 AM3351 , AM3352 , AM3354 , AM3356 , AM3357 , AM3358 , AM3358-EP , AM3359

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
    1. 1.1 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Power Rails Requirements of the System
      2. 2.2.2 Power Sequencing Requirements of the System
      3. 2.2.3 Uncontrolled Power Off
      4. 2.2.4 12-V Input Voltage Rail
    3. 2.3 Highlighted Products
      1. 2.3.1 TLV62568/9
      2. 2.3.2 LM3881
      3. 2.3.3 TLV803
      4. 2.3.4 AM335x
      5. 2.3.5 WL1837MOD
    4. 2.4 System Design Theory
      1. 2.4.1 Power Tree Architecture
      2. 2.4.2 Power Sequencing Solution
        1. 2.4.2.1 Design Steps for DC-DCs
        2. 2.4.2.2 Design Steps for the Sequencer
        3. 2.4.2.3 Design Steps for the Supervisor
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Required Hardware and Software
      1. 3.1.1 Hardware
        1. 3.1.1.1 Connector Configuration of TIDA-01568
        2. 3.1.1.2 Procedure for Board Bring-up and Testing
      2. 3.1.2 Software
        1. 3.1.2.1 Description of Environment Implementation
        2. 3.1.2.2 How to Customize the Processor SDK for This Reference Design
      3. 3.1.3 Software Bring-up Tips
    2. 3.2 Testing and Results
      1. 3.2.1 Test Setup
      2. 3.2.2 Test Results
        1. 3.2.2.1 Power-Up and Power-Down Sequence Test
        2. 3.2.2.2 Typical Characteristics of DC-DCs
  9. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
    3. 4.3 PCB Layout Recommendations
      1. 4.3.1 PCB Layout Guidelines
      2. 4.3.2 Layout Prints
    4. 4.4 Altium Project
    5. 4.5 Gerber Files
    6. 4.6 Assembly Drawings
  10. 5Software Files
  11. 6Related Documentation
    1. 6.1 Trademarks
  12. 7About the Author
  13. 8Revision History

2.2.1 Power Rails Requirements of the System

The considerations for power rails requirements consist of:

  • Number of different power rails
  • Load current of each rail
  • Voltage rating
  • Architecture of power tree

Table 2-1 shows the basic power requirements of this system.

Table 2-1 Basic Power Requirements
SequencePower SupplyDeviceNominal RatingMax Current [mA]
4-up, 1-downVDD_COREAM335x1.1 V ± 4%400
4-up, 1-downVDD_MPUAM335x1.325 V ± 4%1000
1-up, 4-downVIOWL1837MOD1.62 ~ 1.95< 400
1-up, 4-downVDDS_SRAM_MPU_BB, VDDS_SRAM_CORE_BG, VDDA_ADC, VDDS_PLL_DDR, VDDS_PLL_MPU, VDDS_PLL_CORE_LCD, VDDS_OSC, VDDA1P8V_USB0, VDDA1P8V_USB1, VDDSAM335x1.8 V ± 5%590
3-up, 2-downVDDA_USB0, VDDA_USB1, VDDSHVxAM335x3.3 V ± 5%370
3-up, 2-downVBATWL1837MOD3.3 V850
3-up, 2-downV_NANDNAND Flash3.3 V80
3-up, 2-downOther PeripheralBoard3.3 V< 500
2-up, 3-downVDDS_DDR, V_DDR3LDDR3L1.35250

In this system, the processor device on the board is the AM3358BZCZA. The operating performance points (OPPs) have been configured for "Nitro", which means the VDD_MPU should be 1.325 V, enabling a 1-GHz speed grade. The recommended operating conditions are showed in Section 5.5 of the AM335x data sheet. The power consumption summary for each terminal is showed in Section 5.6 of the AM335x data sheet.