SLVUCF3 March   2022 DRA829V , LP8764-Q1 , TDA4VM , TPS6594-Q1

 

  1.   Trademarks
  2. 1Introduction
  3. 2Device Versions
  4. 3Processor Connections
    1. 3.1 Power Mapping
    2. 3.2 Control Mapping
  5. 4Supporting Functional Safety Systems
    1. 4.1 Achieving ASIL-B System Requirements
    2. 4.2 Achieving up to ASIL-D System Requirements
  6. 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 Multi-Device Settings
    13. 5.13 Watchdog Settings
  7. 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 TO_ACTIVE
      6. 6.3.6 TO_RETENTION
  8. 7Application Examples
    1. 7.1 Initialization
    2. 7.2 Moving Between States; ACTIVE and RETENTION
      1. 7.2.1 ACTIVE
      2. 7.2.2 RETENTION
    3. 7.3 Entering and Exiting Standby
    4. 7.4 Entering and Existing LP_STANDBY
    5. 7.5 Runtime Customization
  9. 8References

6.3.6 TO_RETENTION

The C and D triggers, defined by the NSLEEPx bits or pins, trigger the TO_RETENTION sequence. This sequence disables all power rails and GPIOs that are not supplying the retention rails, as described in Figure 3-1. The sequence can be modified using the I2C_7 bit found in register FSM_I2C_TRIGGERS. These bits need to be set by I2C in both PMICs before a trigger for the retention state occurs. If the I2C_7 bit is set high in both PMICs, they enter the DDR retention state as shown in Figure 6-8. LDO1 (VDD1) is not disabled and the GPIO1 of the LP876511B4 (EN_VDDR) is also unchanged. If I2C_7 is set low, these components associated with DDR do not remain active, as shown in Figure 6-7.

Note: The I2C_7 bits need to be set or cleared by I2C in both PMICs before a trigger to the retention state occurs. The I2C_7 trigger is not self-clearing and must be maintained during operation.

In addition to the I2C_7, the processor must also configure the H_DDR_RET_1V1 signal on GPIO2 of the LP876411B4 device. This signal is included in the Section 3.2 but is not part of the power sequence.

The following PMIC PFSM instructions are executed automatically in the beginning of the power sequence to configure the PMICs:


// TPS65941213
// Set LPM_EN, Clear NRSTOUT_SOC and NRSTOUT
REG_WRITE_MASK_IMM ADDR=0x81 DATA=0x04 MASK=0xF8
// Set SPMI_LP_EN and FORCE_EN_DRV_LOW
REG_WRITE_MASK_IMM ADDR=0x82 DATA=0x18 MASK=0xE7
// LP876411B4
// Set SPMI_LP_EN
REG_WRITE_MASK_IMM ADDR=0x82 DATA=0x10 MASK=0xEF
Figure 6-7 TO_RETENTION when I2C_7 is low in both PMICs
Figure 6-8 TO_RETENTION when I2C_7 is high in both PMICs

At the end of the sequence, both PMICs set the LPM_EN and clear the CLKMON_EN and AMUXOUT_EN. The TPS65941213 device also performs an additional 16 ms delay based upon the contents of the register (PFSM_DELAY_REG_2) to ensure that the TPS65941213 sequence finishes last.