BQ27520-G2 Datasheet, PDF (31/47 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge With Integrated LDO

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bq27520-G2
SLUSAB7A – MARCH 2011 – REVISED AUGUST 2011
5.3.6 SOC_INT pin
The SOC_INT pin generates a pulse of different pulse widths under various conditions as indicated by the
table below. After initialization only one SOC_INT pulse will be generated within any given one second
time slot and therefore, may indicate multiple event conditions.
Table 5-6. SOC_INT Pulse Condition and Width
Enable Condition
SOC_Delta
Point
SOC_Delta ≠ 0
SOC1 Set Always
SOC1 Clear Always
SysDown Set Always
SysDown
Clear
Always
State
Change
SOC_Delta ≠ 0
Battery
Removal
INT_BREM bit is set in
OpConfig AND BIE bit is
set
OCV
Command
After Initialization
OCV
Command
INT_FOCV bit is set in
OpConfig
Data Flash After Initialization AND
Write
DFWrIndWaitTime ≠ 0
OTC or OTD
Flags
Factory
Restore
Always
INDFACRES bit is set in
OpConfig B
Pulse Width
1 ms
1 ms
1 ms
1 ms
1 ms
1 ms
Comment
During charge, when the SOC is greater than (>) the points, 100% - n
× SOC_Delta and 100%;
During discharge, when the SOC reaches (≤) the points 100% - n ×
SOC_Delta and 0%;
where n is an integer starting from 0 to the number generating SOC no
less than 0%
When RSOC reached the SOC1 Set or Clear threshold set in the Data
Flash and BL_INT bit in Operation Configuration B is set.
When the Battery Voltage reached the SysDown Set or Clear threshold
set in the Data Flash
When there is a state change including charging, discharging and
relaxation. This function is disabled when SOC_Delta is set to 0.
1 ms
This function is disabled when BIE is cleared.
About 165ms. Same
as the OCV
command execution
time period
About 165ms. Same
as the OCV
command execution
time period
Programmable pulse
width flash (see
comment)
1 ms
About 450 ms
SOC_INT pulses for the OCV command after the initialization.
This command is to generate the SOC_INT pulse during the
initialization.
SOC_INT is used to indicate the data flash update. The gauge will wait
DFWrIndWaitTime times 5μs after the SOC_INT signal to start the
data flash update. This function is disabled if DFWrIndWaitTime is set
to 0.
Upon first assertion of Flags[OTC] or Flags[OTD] over temperature
conditions.
The Factory Restore command instructs the fuel gauge to reset
learned resistance tables and Qmax values to the default values.
Copyright © 2011, Texas Instruments Incorporated
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FUNCTIONAL DESCRIPTION
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