BQ27541 Datasheet, PDF (19/38 Pages) Texas Instruments – Single Cell Li-Ion Battery Fuel Gauge for Battery Pack Integration

bq27541
www.ti.com ........................................................................................................................................................................................... SLUS861 – DECEMBER 2008
Both Unseal Key and Full-Access Key have two words and are stored in data flash. The first word is Key 0 and
the second word is Key 1. The order of the keys sent to bq27541 are Key 1 followed by Key 0. The order of the
bytes for each key entered through the Control( ) command is the reverse of what is read from the part. For an
example, if the Unseal Key is 0x56781234, key 1 is 0x1234 and key 0 is 0x5678. Then Control( ) should supply
0x3412 and 0x7856 to unseal the part. The Unseal key and the FULL-ACCESS key cap only be updated when
in FULL-ACCESS mode.
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