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BQ78412 Fiches technique(PDF) 21 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
Logo TI - Texas Instruments

BQ78412 Fiches technique(HTML) 21 Page - Texas Instruments

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SLUSAA0 – OCTOBER 2010
BatteryStatusWord
The bq78412 maintains a 16-bit master battery status word. This word can be accessed at any time and is also
transmitted in the broadcast status message block.
Table 7. bq78412 Battery Status Word
BIT
STATUS BIT
DESCRIPTION
POSITION
Full
0
1 = full(1)
Discharge
1
1 = discharging(1)
Charge
2
1= charging(1)
Good
3
1 = battery good(1)
Warn
4
1 = battery warning(1)
Replace
5
1 = replace battery(1)
OverChgCurrent
6
1 = overcurrent on charge, charge current > OccThresh
OverDschgCurrent
7
1 = overcurrent on discharge, discharge current > OcdThresh
OverVoltage
8
1 = overcharge, battery voltage above OvThresh
OverTemp
9
1 = over temperature, battery temperature above OtThresh
UnderVoltage
10
1 = over discharge, battery voltage below UvThresh
UnderTemp
11
1 = under temperature, battery temperature below UtThresh
1 = undercharged battery as defined by configuration of MissChgLim parameter. Indicates that the battery
UnderCharged
12
must be charged.
EOD
13
1 = end-of-discharge condition detected. Cleared when charge detected.
14
[0,0] = Sealed level 0
SealStatus[1,0]
[0,1] = Sealed Level 1
15
[1,0] = Sealed Level 2
(1)
See description in Table 4. Status Indicator LEDs
bq78412 Registers and Memory
The bq78412 maintains the status of numerous battery performance variables in its on-chip registers. The device
registers are also used to retrieve the battery operational limits. No password is required to access these
registers. The registers are read-only.
Battery information is retrieved by issuing message commands over the serial interface to access the specific
registers. Registers can be read individually or as a sequential block of registers. All registers are 16-bit registers
or multiples of 16 bits.
Copyright © 2010, Texas Instruments Incorporated
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