SLVUCI5 april   2023 AM6526 , AM6528 , AM6548 , TPS6594-Q1

 

  1.   PDN-0C User's Guide for Powering AM65x with the TPS6594-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
  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 ESM_SOC_ERROR
      5. 6.3.5 PWR_SOC_ERROR
      6. 6.3.6 MCU_TO_WARM
      7. 6.3.7 TO_MCU
      8. 6.3.8 TO_ACTIVE
      9. 6.3.9 TO_RETENTION
  9. 7Application Examples
    1. 7.1 Moving Between States; ACTIVE, MCU ONLY, and RETENTION
      1. 7.1.1 ACTIVE
      2. 7.1.2 MCU ONLY
      3. 7.1.3 RETENTION
    2. 7.2 Entering and Exiting Standby
    3. 7.3 Entering and Existing LP_STANDBY
    4. 7.4 Runtime Customization
  10. 8References

6.1 Configured States

In this PDN, the PMIC devices have the following four configured power states:

  • Standby
  • Active
  • MCU Only
  • Pwr SoC Error
  • Retention

In Figure 6-1, the configured PDN power states are shown, along with the transition conditions to move between the states. Additionally, the transitions to hardware states, such as SAFE RECOVERY and LP_STANDBY are shown. The hardware states are part of the fixed device power Finite State Machine (FSM) and described in the TPS6594-Q1 data sheet, see Section 8.

GUID-20220701-SS0I-PR5M-N5HC-2XVG9P0DQJ0J-low.svg Figure 6-1 Pre-Configurable Finite State Machine (PFSM) Mission States and Transitions

When the PMICs transition from the FSM to the PFSM, several initialization instructions are performed to disable the residual voltage checks on both the BUCK and LDO regulators, set the FIRST_STARTUP_DONE bit and clear the VCCA OV and UV masks which are set in the static configurations, Table 5-8. After these instructions are executed the PMICs wait for a valid ON Request before entering the ACTIVE state. The definition for each power state is described below:

    STANDBYThe PMICs are powered by a valid supply on the system power rail (VCCA > VCCA_UV). All device resources are powered down in the STANDBY state. EN_DRV is forced low in this state. The processor is in the Off state, no voltage domains are energized. Refer to the Section 6.3.2 sequence description.The STANDBY state is also entered when an error occurs and the PMIC transitions out of the PFSM mission states and into the FSM states. When the device returns from the FSM state the to PFSM the first state is represented by STANDBY with all of the resources powered down and EN_DRV forced low. The sequence Section 6.3.1 is performed before the PMIC leaves the PFSM and enters the FSM state SAFE_RECOVERY.
    ACTIVEThe PMICs are powered by a valid supply. The PMICs are fully functional and supply power to all PDN loads. The processor has completed a recommended power up sequence with all voltage domains energized in both MCU and Main processor sections. Refer to the Section 6.3.8 sequence description.
    MCU_ONLYThe PMICs are powered by a valid supply. Only the power resources assigned to the MCU Safety Island are on. VDD_DDR, which is enabled via GPIO4 remains on when trigger I2C_7 is high and is turned off during the transition to the MCU_ONLY state when I2C_7 is low. Refer to the Section 6.3.7 sequence description.
    Pwr SoC ErrorThe PMICs are powered by a valid supply. Only the power resources assigned to the MCU Safety Island are on. Refer to the Section 6.3.5 sequence description. The only active trigger is 'B', requiring the PMICs to return to the MCU_ONLY mode. The return to MCU_ONLY mode and eventually ACTIVE mode is only recommended after the interrupts which caused the SOC_PWR_ERROR have been cleared.
    RetentionThe PMICs are powered by a valid supply. Only GPIO4 remains high, which enables VDD_DDR, all other domains are off to minimize total system power. EN_DRV is forced low in this state. Refer to the Section 6.3.9 sequence description.