BQ27546-G1 Datasheet, PDF (19/38 Pages) Texas Instruments – nullSingle-Cell Li-Ion Battery Fuel Gauge

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bq27546-G1
SLUSC53A – MAY 2015 – REVISED DECEMBER 2015
Table 5. HDQ Pin in Interrupt Mode ([INTSEL] = 1)
[INTPOL]
0
1
INTERRUPT CLEAR
High Impedance
0
INTERRUPT SET
0
High Impedance
INTERRUPT CONDITION
SOC1 Set
Battery High
Battery Low
Over-Temperature Charge
Over-Temperature
Discharge
Internal Short Detection
Tab Disconnect Detection
Imax
Battery Trip Point (BTP)
Table 6. Interrupt Mode Fault Conditions
Flags() STATUS
BIT
ENABLE CONDITION
[SOC1]
Always
[BATHI]
Always
[BATLOW] Always
[OTC]
OT Chg Time ≠ 0
COMMENT
This interrupt is raised when the [SOC1] flag is set.
This interrupt is raised when the [BATHI] flag is set.
This interrupt is raised when the [BATLOW] flag is
set.
This interrupt is raised when the [OTC] flag is set.
[OTD]
OT Dsg Time ≠ 0
This interrupt is raised when the [OTD] flag is set.
[ISD]
[TDD]
[IMAX]
[SOC1]
[SE_ISD] = 1 in Pack
Configuration B
[SE_TDD] = 1 in Pack
Configuration B
[IMAXEN] = 1 in Pack
Configuration D
[BTP_EN] = 1 in Pack
Configuration C. The BTP
interrupt supersedes all other
interrupt sources, which are
unavailable when BTP is active.
This interrupt is raised when the [ISD] flag is set.
This interrupt is raised when the [TDD] flag is set.
This interrupt is raised when the [IMAX] flag is set.
This interrupt is raised when RemainingCapacity() ≤
BTPSOC1Set() or RemainingCapacity() ≥
BTPSOC1Clear() during battery discharge or
charge, respectively. The interrupt remains asserted
until new values are written to both the
BTPSOC1Set() and BTPSOC1Clear() registers.
9.4.3 Security Modes
The bq27546-G1 provides three security modes (FULL ACCESS, UNSEALED, and SEALED) that control data
flash access permissions. Data flash refers to those data flash locations that are accessible to the user.
Manufacture Information refers to the two 32-byte blocks.
9.4.3.1 Sealing and Unsealing Data Flash
The bq27546-G1 implements a key-access scheme to transition between SEALED, UNSEALED, and FULL
ACCESS modes. Each transition requires that a unique set of two keys be sent to the bq27546-G1 via the
Control() command. The keys must be sent consecutively with no other data being written to the Control()
register in between.
NOTE
To avoid conflict, the keys must be different from the codes presented in the CNTL DATA
column of Table 8 subcommands.
When in SEALED mode the [SS] bit of CONTROL_STATUS is set, but when the UNSEAL keys are correctly
received by the bq27546-G1, the [SS] bit is cleared. When the full-access keys are correctly received the
CONTROL_STATUS [FAS] bit is cleared.
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 bq27546-G1 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 can only be updated
when in FULL ACCESS mode.
Copyright © 2015, Texas Instruments Incorporated
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