Ctrl_Restart_Chip; Ctrl_Reset_Flag; Ctrl_Update_Telem - Analog Devices LINEAR LT8491 Manual

2
I C REGISTER DESCRIPTIONS
• The supply status register STAT_SUPPLY→SOLAR_STATE bits [2:0] clear to 000b.
• The fault register STAT_CHRG_FAULTS holds its last value reported before CHRG_EN=0.
• The ECON pin is driven low (see Optional: EXTV
• Some registers cannot be written until the CHRG_LOGIC_ON bit clears in the STAT_CHARGER register. Be sure
to poll the CHRG_LOGIC_ON bit before attempting subsequent register writes.
After changing the CHRG_EN setting, some operations listed above may not happen immediately unless otherwise
indicated. As discussed in the Startup Sequence section, the BOOT_INIT_CHRG_EN value is automatically copied from
the EEPROM into this CTRL_CHRG_EN register near the end of the startup sequence. This provides a way to start the
charging automatically after startup by storing 0x01 in the BOOT_INIT_CHRG_EN.
Related Data Sheet Sections: Data: Access Permissions

CTRL_RESTART_CHIP

2
I C REGISTER
ADDRESS BIT NAME
0x24 -
To issue a restart chip command, the CTRL_CHRG_EN register must be cleared. The part will restart after 0x99 is
written to the CTRL_RESTART_CHIP register. Upon restarting, the CTRL_CHRG_EN→CHRG_EN bit is set to the value
read from the BOOT_INIT_CHRG_EN EEPROM location.
Related Data Sheet Sections: Startup Sequence, Data: Access Permissions

CTRL_RESET_FLAG

2
I C REGISTER
ADDRESS BIT NAME
0x25 Reserved
RESET_FLAG
Related Data Sheet Sections: Startup Sequence, Data: Access Permissions

CTRL_UPDATE_TELEM

2
I C REGISTER
ADDRESS BIT NAME
0x26 Reserved
BUSY_RDY
2
I C REGISTER
ADDRESS BIT NAME
0x26 -
Disconnect section).
CC
BIT(S) DESCRIPTION
[7:0] Write 0x99 to restart the LT8491. See Startup Sequence section for more information. Returns 0's
on reads.
BIT(S) DESCRIPTION
[7:1] Reserved
[0] This bit is set to 1 during startup. It can be cleared by the user after startup completes. Subsequent
reading of this bit will indicate if the IC has reset (power cycle) or restarted (write 0x99 to CTRL_
RESTART_CHIP to restart the chip) since the last time the bit was cleared.
BIT(S) DESCRIPTION
[7:1] Reserved
[0] Read of this bit returns a 1 while the telemetry update is in progress.
BIT(S) DESCRIPTION
[7:0] Write to 0xAA to update telemetry.
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LT8491
Rev. 0
41