BQ2010_15 Datasheet, PDF (15/26 Pages) Texas Instruments – Gas Gauge IC

Not Recommended For New Designs
bq2010
whenever the NAC registers are counting at a rate equiva-
lent to |V_SRO| ≥ 4mV. When pulled low, the segment out-
puts become active immediately. A capacitor tied to DISP
allows the display to remain active for a short period of
time after activation by a push-button switch.
The segment outputs are modulated as two banks of
three, with segments 1, 3, and 5 alternating with seg-
ments 2, 4, and 6. The segment outputs are modulated
at approximately 100Hz with each segment bank active
for 30% of the period.
SEG₁ blinks at a 4Hz rate whenever V_SB has been de-
tected to be below V_EDV1 (EDV1 = 1), indicating a low-
battery condition. V_SB below V_EDVF (EDVF = 1) disables
the display output.
Microregulator
The bq2010 can operate directly from 3 or 4 cells. To fa-
cilitate the power supply requirements of the bq2010, an
REF output is provided to regulate an external low-
threshold n-FET. A micropower source for the bq2010
can be inexpensively built using the FET and an exter-
nal resistor; see Figure 1.
Absolute Maximum Ratings
Symbol
V_CC
All other pins
REF
Parameter
Relative to V_SS
Relative to V_SS
Relative to V_SS
V_SR
Relative to V_SS
T_OPR
Operating tempera-
ture
Minimum
-0.3
-0.3
-0.3
-0.3
0
Maximum
+7.0
+7.0
+8.5
+7.0
+70
Unit
Notes
V
V
V Current limited by R1 (see Figure 1)
Minimum 100Ω series resistor should
V
be used to protect SR in case of a
shorted battery (see the bq2010 appli-
cation note for details).
°C Commercial
Note:
Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional operation
should be limited to the Recommended DC Operating Conditions detailed in this data sheet. Exposure to condi-
tions beyond the operational limits for extended periods of time may affect device reliability.
DC Voltage Thresholds (T_A = T_OPR; V = 3.0 to 6.5V)
Symbol
Parameter
V_EDVF Final empty warning
V_EDV1 First empty warning
V_SR1
Discharge compensation threshold
V_SRO
SR sense range
V_SRQ
Valid charge
V_SRD
Valid discharge
V_MCV
Maximum single-cell voltage
V_BR
Battery removed/replaced
Minimum
0.93
1.03
-120
-300
375
-
2.20
-
2.20
Typical
0.95
1.05
-150
-
-
-
2.25
0.1
2.25
Maximum
0.97
1.07
-180
+2000
-
-300
2.30
0.25
2.30
Unit
Notes
V SB
V SB
mV SR, V_SR + V_OS
mV SR, V_SR + V_OS
µV V_SR + V_OS (see note)
µV V_SR + V_OS (see note)
V SB
V SB pulled low
V SB pulled high
Note:
Default value; value set in DMF register. V_OS is affected by PC board layout. Proper layout guidelines
should be followed for optimal performance. See “LayoutConsiderations.”
15