SPRABJ8D September   2022  – May 2025 AM2612 , AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1 , AM263P2 , AM263P2-Q1 , AM263P4 , AM263P4-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 Power
    1. 2.1 Discrete DC-DC Power Solution
    2. 2.2 Integrated PMIC Power Solution
    3. 2.3 Power Decoupling and Filtering
      1. 2.3.1 ADC/DAC Voltage Reference Decoupling
    4. 2.4 Estimated Power Consumption
    5. 2.5 Power Distribution Network
      1. 2.5.1 Simulations
        1. 2.5.1.1 Core Digital Power 1.2V
        2. 2.5.1.2 Digital and Analog I/O Power 3.3V
    6. 2.6 eFuse Power
  6. 3 Clocking
    1. 3.1 Crystal and Oscillator Input Options
    2. 3.2 Output Clock Generation
    3. 3.3 Crystal Selection and Shunt Capacitance
    4. 3.4 Crystal Placement and Routing
  7. 4 Resets
  8. 5 Bootstrapping
    1. 5.1 SOP Signal Implementation
  9. 6 OSPI and QSPI Memory Implementation
    1. 6.1 ROM OSPI and QSPI Boot Requirements
      1. 6.1.1 AM263x QSPI Boot Pin Requirements
      2. 6.1.2 AM263Px OSPI and QSPI Boot Pin Requirements
      3. 6.1.3 AM261x OSPI and QSPI Boot Pin Requirements
    2. 6.2 Additional OSPI and QSPI References
  10. 7 Debug Interfaces
    1. 7.1 JTAG Emulators and Trace
    2. 7.2 UART
  11. 8 USB
    1. 8.1 USB Device Mode
    2. 8.2 USB Host Mode
  12. 9 Multiplexed Peripherals
  13. 10Digital Peripherals
    1. 10.1 General Digital Peripheral Routing Guidelines
    2. 10.2 Trace Length Matching
  14. 11Analog Peripherals
    1. 11.1 General Analog Peripheral Routing Guidelines
      1. 11.1.1 Resolver ADC Routing Guidelines
  15. 12Layer Stackup
    1. 12.1 Key Stackup Features
  16. 13Vias
  17. 14BGA Power Fan-Out and Decoupling Placement
    1. 14.1 Ground Return
      1. 14.1.1 Ground Return - ZCZ Package AM26x Devices
      2. 14.1.2 Ground Return - ZNC and ZFG Package AM261x Devices
    2. 14.2 1.2V Core Digital Power
      1. 14.2.1 1.2V Core Digital Power Key Layout Considerations - ZCZ
      2. 14.2.2 1.2V Core Digital Power Key Layout Considerations - ZFG
    3. 14.3 3.3V Digital and Analog Power
      1. 14.3.1 3.3V I/O Power Key Layout Considerations - ZCZ
      2. 14.3.2 3.3V I/O Power Key Layout Considerations - ZFG
    4. 14.4 1.8V Digital and Analog Power
      1. 14.4.1 1.8V Key Layout Considerations - ZCZ
      2. 14.4.2 1.8V Key Layout Considerations - ZFG
  18. 15Summary
  19. 16References
  20. 17Revision History

2 Power

AM26x Device Power Rails

AM26x devices have two main device power nets: The core voltage rail, and the IO voltage rail. Table 2-1 details the core voltage requirements for AM26x devices. Table 2-2 details the IO voltage requirements for AM26x devices.

Table 2-1 AM26x Core Voltage Requirements
Device Core Voltage Associated Core Power Nets
AM263x 1.2V VDD_CORE
VDDAR
AM263Px 1.2V VDD_CORE
VDDAR
AM261x (Automotive-grade, 400MHz) 1.2V VDD_CORE
VDDAR
AM261x (Industrial-grade, 400MHz OR 500MHz) 1.25V VDD_CORE
VDDAR
Note: AM261x core voltage differs depending on the microcontroller Orderable Part Number (OPN). Industrial-grade AM261xAO... devices require 1.25V for the core supply for operation at 500MHz or 400MHz. Automotive-grade AM261xAL…Q1 and AM261xAP...Q1 devices require 1.2V for the core supply for operation at 400MHz or 200MHz. For more details on the AM261x OPNs, refer to the AM261x Sitara™ Microcontroller data sheet.
Table 2-2 AM26x IO Voltage Requirements
Device IO Voltage Associated Power Nets
AM263x 3.3V VDDS33
VDDA33
AM263Px 3.3V VDDS33
VDDA33
AM261x (Industrial & Automotive-grade) 3.3V VDDSHV_A
VDDSHV_B
VDDSHV_C
VDDSHV_F
VDDSHV_G
3.3V or 1.8V VDDSHV_D
VDDSHV_E
Note: AM261x power nets VDDSHV_D and VDDSHV_E can be either 3.3V or 1.8V, depending on what voltage level external flash is used. For more information, refer to Section 6.

Different power topologies, such as discrete supplies or Power Management ICs (PMICs) can be used to supply an AM26x system. The following sections detail the different types of topologies used.