SNVSC07A June   2021  – September 2022 LP876242-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1. 5.1 Digital Signal Descriptions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Internal Low Drop-Out Regulators (LDOVINT)
    6. 6.6  BUCK1, BUCK2, BUCK3, and BUCK4 Regulators
    7. 6.7  Reference Generator (REFOUT)
    8. 6.8  Monitoring Functions
    9. 6.9  Clocks, Oscillators, and DPLL
    10. 6.10 Thermal Monitoring and Shutdown
    11. 6.11 System Control Thresholds
    12. 6.12 Current Consumption
    13. 6.13 Digital Input Signal Parameters
    14. 6.14 Digital Output Signal Parameters
    15. 6.15 I/O Pullup and Pulldown Resistance
    16. 6.16 I2C Interface
    17. 6.17 Serial Peripheral Interface (SPI)
    18.     25
    19. 6.18 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Input Voltage Monitor
      2. 7.3.2 Power Resources
        1. 7.3.2.1 Buck Regulators
          1. 7.3.2.1.1 BUCK Regulator Overview
          2. 7.3.2.1.2 Spread-Spectrum Mode
          3. 7.3.2.1.3 Adaptive Voltage Scaling (AVS) and Dynamic Voltage Scaling (DVS) Support
          4. 7.3.2.1.4 BUCK Output Voltage Setting
          5. 7.3.2.1.5 Sync Clock Functionality
        2. 7.3.2.2 Internal Low Dropout Regulator (LDOVINT)
      3. 7.3.3 Residual Voltage Checking
      4. 7.3.4 Output Voltage Monitor and PGOOD Generation
      5. 7.3.5 General-Purpose I/Os (GPIO Pins)
      6. 7.3.6 Thermal Monitoring
        1. 7.3.6.1 Thermal Warning Function
        2. 7.3.6.2 Thermal Shutdown
      7. 7.3.7 Interrupts
      8. 7.3.8 Watchdog (WD)
        1. 7.3.8.1 Watchdog Fail Counter and Status
        2. 7.3.8.2 Watchdog Start-Up and Configuration
        3. 7.3.8.3 MCU to Watchdog Synchronization
        4. 7.3.8.4 Watchdog Disable Function
        5. 7.3.8.5 Watchdog Sequence
        6. 7.3.8.6 Watchdog Trigger Mode
        7. 7.3.8.7 WatchDog Flow Chart and Timing Diagrams in Trigger Mode
        8.       55
        9. 7.3.8.8 Watchdog Question-Answer Mode
          1. 7.3.8.8.1 Watchdog Q&A Related Definitions
          2. 7.3.8.8.2 Question Generation
          3. 7.3.8.8.3 Answer Comparison
            1. 7.3.8.8.3.1 Sequence of the 2-bit Watchdog Answer Counter
            2. 7.3.8.8.3.2 Watchdog Sequence Events and Status Updates
            3. 7.3.8.8.3.3 Watchdog Q&A Sequence Scenarios
      9. 7.3.9 Error Signal Monitor (ESM)
        1. 7.3.9.1 ESM Error-Handling Procedure
        2. 7.3.9.2 Level Mode
        3.       66
        4. 7.3.9.3 PWM Mode
          1. 7.3.9.3.1 Good-Events and Bad-Events
          2. 7.3.9.3.2 ESM Error-Counter
            1. 7.3.9.3.2.1 ESM Start-Up in PWM Mode
          3. 7.3.9.3.3 ESM Flow Chart and Timing Diagrams in PWM Mode
          4.        72
    4. 7.4 Device Functional Modes
      1. 7.4.1 Device State Machine
        1. 7.4.1.1 Fixed Device Power FSM
          1. 7.4.1.1.1 Register Resets and EEPROM read at INIT state
        2. 7.4.1.2 Pre-Configurable Mission States
          1. 7.4.1.2.1 PFSM Commands
            1. 7.4.1.2.1.1  REG_WRITE_IMM Command
            2. 7.4.1.2.1.2  REG_WRITE_MASK_IMM Command
            3. 7.4.1.2.1.3  REG_WRITE_MASK_PAGE0_IMM Command
            4. 7.4.1.2.1.4  REG_WRITE_BIT_PAGE0_IMM Command
            5. 7.4.1.2.1.5  REG_WRITE_WIN_PAGE0_IMM Command
            6. 7.4.1.2.1.6  REG_WRITE_VOUT_IMM Command
            7. 7.4.1.2.1.7  REG_WRITE_VCTRL_IMM Command
            8. 7.4.1.2.1.8  REG_WRITE_MASK_SREG Command
            9. 7.4.1.2.1.9  SREG_READ_REG Command
            10. 7.4.1.2.1.10 SREG_WRITE_IMM Command
            11. 7.4.1.2.1.11 WAIT Command
            12. 7.4.1.2.1.12 DELAY_IMM Command
            13. 7.4.1.2.1.13 DELAY_SREG Command
            14. 7.4.1.2.1.14 TRIG_SET Command
            15. 7.4.1.2.1.15 TRIG_MASK Command
            16. 7.4.1.2.1.16 END Command
          2. 7.4.1.2.2 Configuration Memory Organization and Sequence Execution
          3. 7.4.1.2.3 Mission State Configuration
          4. 7.4.1.2.4 Pre-Configured Hardware Transitions
            1. 7.4.1.2.4.1 ON Requests
            2. 7.4.1.2.4.2 OFF Requests
            3. 7.4.1.2.4.3 NSLEEP1 and NSLEEP2 Functions
            4. 7.4.1.2.4.4 WKUP1 and WKUP2 Functions
        3. 7.4.1.3 Error Handling Operations
          1. 7.4.1.3.1 Power Rail Output Error
          2. 7.4.1.3.2 Boot BIST Error
          3. 7.4.1.3.3 Runtime BIST Error
          4. 7.4.1.3.4 Catastrophic Error
          5. 7.4.1.3.5 Watchdog (WDOG) Error
          6. 7.4.1.3.6 Error Signal Monitor (ESM) Error
          7. 7.4.1.3.7 Warnings
        4. 7.4.1.4 Device Start-up Timing
        5. 7.4.1.5 Power Sequences
        6. 7.4.1.6 First Supply Detection
      2. 7.4.2 Multi-PMIC Synchronization
        1. 7.4.2.1 SPMI Interface System Setup
        2. 7.4.2.2 Transmission Protocol and CRC
          1. 7.4.2.2.1 Operation with Transmission Errors
          2. 7.4.2.2.2 Transmitted Information
        3. 7.4.2.3 SPMI Target Device Communication to SPMI Controller Device
          1. 7.4.2.3.1 Incomplete Communication from SPMI Target Device to SPMI Controller Device
        4. 7.4.2.4 SPMI-BIST Overview
          1. 7.4.2.4.1 SPMI Bus during Boot BIST and RUNTIME BIST
          2. 7.4.2.4.2 Periodic Checking of the SPMI
          3. 7.4.2.4.3 SPMI Message Priorities
    5. 7.5 Control Interfaces
      1. 7.5.1 CRC Calculation for I2C and SPI Interface Protocols
      2. 7.5.2 I2C-Compatible Interface
        1. 7.5.2.1 Data Validity
        2. 7.5.2.2 Start and Stop Conditions
        3. 7.5.2.3 Transferring Data
        4. 7.5.2.4 Auto-Increment Feature
      3. 7.5.3 Serial Peripheral Interface (SPI)
    6. 7.6 NVM Configurable Registers
      1. 7.6.1 Register Page Partitioning
      2. 7.6.2 CRC Protection for Configuration, Control, and Test Registers
      3. 7.6.3 CRC Protection for User Registers
      4. 7.6.4 Register Write Protection
        1. 7.6.4.1 ESM and Watchdog Configuration Registers
        2. 7.6.4.2 User Registers
    7. 7.7 Register Map
      1. 7.7.1 LP876242_map Registers
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Design Requirements
        1. 8.2.1.1 Buck Inductor Selection
        2. 8.2.1.2 Buck Input Capacitor Selection
        3. 8.2.1.3 Buck Output Capacitor Selection
        4. 8.2.1.4 LDO Output Capacitor Selection
        5. 8.2.1.5 VCCA Supply Filtering Components
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Voltage Scaling Precautions
      4. 8.2.4 Application Curves
    3. 8.3 Layout
      1. 8.3.1 Layout Guidelines
      2. 8.3.2 Layout Example
    4. 8.4 Power Supply Recommendations
  9. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.4.1.1 Fixed Device Power FSM

The Fixed Device Power portion of the FSM engine manages the power up of the device before the power rails are fully enabled and ready to power external loadings, and the power down of the device when in the event of insufficient power supply or device or system error conditions. While the device is in one of the Hardware Device Powers states, the ENABLE_DRV bit remains low.

The definitions and transition triggers of the Device Power States are fixed and cannot be reconfigured.

Following are the definitions of the Device Power states:

    NO SUPPLY The device is not powered by a valid energy source on the system power rail. The device is completely powered off.
    LP_STANDBY The device can enter this state from a mission state after receiving a valid OFF request by ENABLE pin or I2C trigger and the LP_STANDBY_SEL = 1. The internal LDO (LDOVINT) is enabled and VCCA monitoring is disabled to minimize power dissipation. As the accurate VCCA monitoring is disabled, the VCCA voltage must be above 1.7 V during LP_STANDBY state, or stay below 1.7 V for minimum 20 ms to ensure that the digital is reset correctly. If this requirement for VCCA cannot be met, STANDBY state must be used instead of LP_STANDBY. The wake-up from LP_STANDBY state can be initiated by active edge on ENABLE signal or by WKUPx pins.
    INIT The device is powered by a valid supply on the system power rail (VCCA ≥ VCCA_UV). If the device was previously in LP_STANDBY state, it has received an external wake-up signal at the WKUP1/2 pins, or an On Request from the ENABLE pin. Device digital and monitor circuits are powered up. The PMIC reads its internal NVM memory in this state and configures default values to registers, IO configuration and FSM accordingly.
    BOOT BIST The device is running the built-in self-test routine that includes both the ABIST , the LBIST/ and the CRC. An option is available to shorten the device power up time from the NO_SUPPLY state by setting the NVM bit FAST_BOOT_BIST = '1' to skip the LBIST. Software can also set the FAST_BIST = '1' to skip LBIST after the device wakes up from the LP STANDBY state. When the device arrives at this state from the SAFE_RECOVERY state, LBIST is automatically skipped if it has not previously failed. If LBIST failed, but passed after multiple re-tries before exceeding the recovery counter limit, the device powers up normally. The following NVM bits are pre-configured options that can be set to disable parts of the ABIST orCRC tests if further sequence time reduction is required (please refer to the User's Guide of the orderable part number):
    • REG_CRC_EN = '0': disables the register map and SRAM CRC check
    • VMON_ABIST_EN = '0': disables the ABIST for the VMON OV/UV function
    Note: Note: the BIST tests are executed as parallel processes, and the longest process determines the total BIST duration
    RUNTIME BIST A request was received from the MCU to exercise a run-time built-in self-test (RUNTIME_BIST) on the device. No rails are modified and all external signals, including all I2C or SPI interface communications, are ignored during BIST. If the device passed BIST, it resumes the previous operation. If the device failed BIST, it shuts down all of the regulator outputs and proceed to the SAFE RECOVERY state. In order to avoid a register CRC error, all register writes must be avoided after the request for the BIST operation until the device pulls the nINT pin low to indicate the completion of BIST. The results of the BIST are indicated by the BIST_PASS_INT or the BIST_FAIL_INT bits.
    Note:

    For executing the RUNTIME_BIST, the system software must perform following steps:

    Before RUNTIME_BIST request:

    1) Set VCCA_UV_MASK, VCCA_OV_MASK, all BUCKx_UV_MASK, all BUCKx_OV_MASK, VMONx_UV_MASK and VMONx_OV_MASK bits to 1

    2) If PGOOD pin is used, clear all PGOOD_SEL_BUCKx and PGOOD_SEL_VMONx bits to 0

    After completion of RUNTIME_BIST:

    1) Clear VCCA_UV_MASK, VCCA_OV_MASK, all VMONx_UV_MASK, all VMONx_OV_MASK, all BUCKx_UV_MASK and all BUCKx_OV_MASK bits to 0
    SAFE RECOVERY The device meets the qualified error condition for immediate or ordered shutdown request. If the error is recovered within the recovery time interval or meets the restart condition, the device increments the recovery counter, and returns to INIT state if the recovery counter value does not exceed the threshold value. Until a supply power cycle occurs, the device stays in the SAFE RECOVERY state if one of the following conditions occur:
    • the recovery counter exceeds the threshold value
    • the die temperature cannot be reduced to less than TWARN level
    • VCCA stays above OVP threshold

When multiple system conditions occur simultaneously that demand power state arbitration, the device goes to the higher priority state according to the following priority order:

  1. NO SUPPLY
  2. SAFE_RECOVERY
  3. LP_STANDBY
  4. MISSION STATES

Figure 7-35 shows the power transition states of the FSM engine.

Figure 7-35 State Diagram for Device Power States