SLUUAQ3A April 2016 – October 2022 BQ4050
SEALED to UNSEALED instructs the device to extend access to the SBS and data flash space and clears the [SEC1][SEC0] flags. In UNSEALED mode, all data, SBS, and DF have read/write access. Note that although writing to most of the SBS commands are accepted by the gauge, the written data will be immediately overwritten by the gauge and the write action is ignored. Unsealing is a two-step command performed by writing the first word of the unseal key to ManufacturerAccess() (MAC), followed by the second word of the unseal key to ManufacturerAccess(). The two words must be sent within 4 s. The unseal key can be read and changed via the MAC SecurityKey() command when in the FULL ACCESS mode. To return to the SEALED mode, either a hardware reset is needed or the MAC Seal Device() command is needed to transit from FULL ACCESS or UNSEALED to SEALED.