SLVAF93A october   2022  – april 2023 LP8764-Q1 , TPS6594-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Hardware and PMIC Setup
  5. 3Configuration Overview
  6. 4Instructions
  7. 5Special Considerations
    1. 5.1 Changing the Serial Control Interface
    2. 5.2 Updating the Frequency Selection
    3. 5.3 PFSM
    4. 5.4 Permanently Locking the NVM
    5. 5.5 Updating the Register CRC
  8. 6NVM Validation
  9. 7References
  10.   A Registers Backed by NVM
  11.   B Non-NVM Registers Which are Part of the Register CRC
  12.   C CRC for User Registers, Page 0 and Page 4
  13.   D Example With I2C Serial Interface
  14.   E Revision History

5.4 Permanently Locking the NVM

To permanently lock the NVM, the register address 0x41 in page 1 must be changed to some value other than 0xA5. 0xA5 is the default value and therefore no action is needed to keep the NVM in the unlocked state. When the NVM is permanently locked the PMIC functionality remains unchanged with the exception that the NVM can no longer be updated. Access to the register map, shown in Figure 3-1, is preserved while the NVM is locked.