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BQ78412 Fiches technique(PDF) 13 Page - Texas Instruments

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No de pièce BQ78412
Description  Pb-Acid Battery State-of-Charge Indicator With Run-Time Display
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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BQ78412 Fiches technique(HTML) 13 Page - Texas Instruments

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SLUSAA0 – OCTOBER 2010
Table 5. DevConfig2 Parameter Description
NUMBER OF
BITS
CONDITION
DESCRIPTION
BEEPS
[1:0]
Empty
RTTE = 0 minutes, during discharge
[3:2]
LED0 turns off
RTTE = time in LED0, during discharge
0 to 3
[5:4]
LED1 turns off
RTTE = time in LED0 + time in LED1, during discharge
[7:6]
LED2 turns off
RTTE = time in LED0 + time in LED1 + time in LED2, during discharge
[10:8]
Overvoltage
Battery voltage > OvThresh
0 to 7
[13:11]
Undervoltage
Battery voltage < UvThresh
Operational States
The bq78412 supports three operational states.
Active
Idle
Sleep
Active State
When the bq78412 detects that the battery is being charged or discharged (Current magnitude
≥TransToActive),
it enters the active state. Upon entry to the active state, the display is activated and run-time-to-empty or %SoC
is displayed.
Idle State
When the bq78412 detects that the observed current magnitude is less than or equal to IdleThresh, it enters the
Idle state. In Idle state, the display is active and remains at the last displayed value when in the active state.
Sleep State
If the bq78412 is in the idle state for more than the number of seconds specified in SleepTime, it enters the sleep
state. In sleep state, the display is turned off.
In each of the states, the bq78412 periodically measures current, voltage, temperature, records elapsed time,
and updates the warranty record. Also, the UART interface remains active in all states (including broadcasts, if
enabled). Coulomb counting is disabled in the idle and sleep states.
Copyright © 2010, Texas Instruments Incorporated
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