Stat_Supply; Stat_Tsx_Remain - Analog Devices LINEAR LT8491 Manual

LT8491
2
I C REGISTER DESCRIPTIONS

STAT_SUPPLY

2
I C REGISTER
ADDRESS BIT NAME
0x14 Reserved
VIN_UVLO
PS_OR_SOLAR
SOLAR_STATE

STAT_TSx_REMAIN

2
I C REGISTER
ADDRESS BIT NAME
0x15 STAT_TS0_REMAIN
0x16 STAT_TS1_REMAIN
0x17 STAT_TS2_REMAIN
0x18 STAT_TS3_REMAIN
These four registers indicate the time remaining in the respective stage timers (Stages 0 to 3). Configuration of the
starting values is discussed in the Configure Stage Timeout Limits section. If configured for a finite time limit and
powered by a DC power supply, the respective timer will count down while charging in the respective stage. When
a timer counts down to 0x00 the charging stops. The CFG_TERMINATE→Sx_TMR_TERM_EN bits determine if an
expired timer indicates a fault or not.
36
BIT(S) DESCRIPTION
[7:5] Reserved
[4] When powered by a panel:
1 indicates that the input voltage is below 10 Volts if Low Power Mode is enabled, otherwise input
voltage is below 5.7 Volts. 0 indicates that the Input Panel Voltage is above 10 Volts if Low Power
Mode is enabled, otherwise input panel voltage is above 5.7 Volts.
Related Data Sheet Sections: Configure Misc. section
[3] 1 Indicates that the LT8491 is being supplied by a DC power supply as detected by a low voltage on the
VINR pin. MPPT and related functions are disabled. 0 Indicates that the LT8491 is being supplied by a
solar panel.
Related Data Sheet Sections: HW Config: DC Supply Powered Charging, Optional: DC Supply Detection
Circuit, TELE_VINR
[2:0] Indicates the operating state of the solar panel:
• 101b = Battery Limited:
• 100b = Full Panel Scan:
• 011b = Perturb and Observe:
• 010b = LP Mode and V
• 001b = LP Mode and V
• 000b = None of the Above
BIT(S) DESCRIPTION
[7:0] Time remaining before respective stage timer expires. More details below.
[7:0]
[7:0]
[7:0]
For more information
The battery may not presently be capable of drawing the
maximum power available from the solar panel, therefore the
panel may not be operating at the maximum power point.
In this state, a full scan of the solar panel is being performed
to make sure that the global maximum power point is being
tracked.
The solar panel is tracking a maximum power point.
Pulsing: The available panel current is too low for constant charging.
IN
Instead the low power operating mode is active, resulting in
pulsing of the panel voltage as discussed in the Optional: Low
Power Mode section.
too low: The available panel current is too low for constant charging and
IN
the panel voltage is too low to extract charging energy from. See
Optional: Low Power Mode section.
This is indicated if none of the above conditions exist. Examples
may include: the input is not a solar panel; the panel voltage
and/or current is not adequate for any of the above operations;
a fault has occurred, and no charging is occurring; charger is in
done charging state; other conditions may be possible.
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