SLVUCD4 November   2022 DRA821U , DRA821U-Q1 , TPS6594-Q1

 

  1.   PDN-2A User's Guide for Powering DRA821 with TPS65941515-Q1 PMIC
  2.   Trademarks
  3. 1Introduction
  4. 2Device Versions
  5. 3Processor Connections
    1. 3.1 Power Mapping
    2. 3.2 Control Mapping
  6. 4Supporting Functional Safety Systems
    1. 4.1 Achieving ASIL-B System Requirements
    2. 4.2 Achieving up to ASIL-D System Requirements
  7. 5Static NVM Settings
    1. 5.1  Application-Based Configuration Settings
    2. 5.2  Device Identification Settings
    3. 5.3  BUCK Settings
    4. 5.4  LDO Settings
    5. 5.5  VCCA Settings
    6. 5.6  GPIO Settings
    7. 5.7  Finite State Machine (FSM) Settings
    8. 5.8  Interrupt Settings
    9. 5.9  POWERGOOD Settings
    10. 5.10 Miscellaneous Settings
    11. 5.11 Interface Settings
    12. 5.12 Watchdog Settings
  8. 6Pre-Configurable Finite State Machine (PFSM) Settings
    1. 6.1 Configured States
    2. 6.2 PFSM Triggers
    3. 6.3 Power Sequences
      1. 6.3.1 TO_SAFE_SEVERE and TO_SAFE
      2. 6.3.2 TO_SAFE_ORDERLY and TO_STANDBY
      3. 6.3.3 ACTIVE_TO_WARM
      4. 6.3.4 TO_ACTIVE
      5. 6.3.5 TO_RETENTION
  9. 7Application Examples
    1. 7.1 Moving Between States: ACTIVE and RETENTION
      1. 7.1.1 ACTIVE
      2. 7.1.2 RETENTION
    2. 7.2 Entering and Exiting Standby
    3. 7.3 Entering and Existing LP_STANDBY
    4. 7.4 GPIO8 and Watchdog
  10. 8References

5.1 Application-Based Configuration Settings

In the TPS6594-Q1 data sheet, there are seven application-based configurations for each BUCK to operate within. The following list includes the different configurations available:

  • 2.2 MHz Single Phase for DDR Termination
  • 4.4 MHz VOUT Less than 1.9 V, Multiphase or High COUT Single Phase
  • 4.4 MHz VOUT Less than 1.9 V, Low COUT, Single Phase Only
  • 4.4 MHz VOUT Greater than 1.7 V, Single Phase Only
  • 2.2 MHz VOUT Less than 1.9 V Multiphase or Single Phase
  • 2.2 MHz Full VOUT Range and VIN Greater than 4.5 V, Single Phase Only
  • 2.2 MHz Full VOUT and Full VIN Range, Single Phase Only

The seven configurations also have optimal output inductance values that optimize the performance of each buck under these various conditions. Table 5-1 shows the default configurations for the BUCKs. These settings cannot be changed after device startup.

Table 5-1 Application Use Case Settings
DeviceBUCK RailDefault Application Use CaseRecommended Inductor Value
TPS65941515-Q1BUCK14.4 MHz VOUT Less than 1.9 V Single Phase220 nH
BUCK24.4 MHz VOUT Less than 1.9 V Single Phase220 nH
BUCK34.4 MHz VOUT Less than 1.9 V Single Phase220 nH
BUCK44.4 MHz VOUT Less than 1.9 V Single Phase220 nH
BUCK54.4 MHz VOUT Less than 1.9 V Single Phase220 nH