BQ2052_15 Datasheet, PDF (13/20 Pages) Texas Instruments – Gas Gauge IC

Not Recommended For New Designs
Preliminary bq2052
On initialization with PROG6=L, the bq2052 sets the
registers as
FNAC = 0x00
CACH = 0x00
CACL = 0x00
RCAC = 0x00
FLGS1 = 0x10
Layout Considerations
The bq2052 measures the voltage differential between
the SR and V_SS pins. V_OS (the offset voltage at the SR
pin) is greatly affected by PC board layout. For optimal
results, the PC board layout should follow the strict rule
of a single-point ground return. Sharing high-current
ground with small signal ground causes undesirable
noise on the small signal nodes.
Absolute Maximum Ratings
Symbol
Parameter
Minimum Maximum Unit
Notes
V_CC
All other pins
REF
Relative to VSS
Relative to V_SS
Relative to V_SS
VSR
Relative to V_SS
-0.3
+7.0
V
-0.3
+7.0
V
-0.3
+8.5
V Current limited by R1 (see Figure 1)
Recommended 100KΩ series resistor
-0.3
Vcc+0.7
V should be used to protect SR in case
of a shorted battery.
T_OPR
Operating temperature
-20
+70
°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 conditions beyond the operational limits for extended periods of time may affect device reli-
ability.
DC Voltage Thresholds (TA = TOPR; V = 3.0 to 6.5V)
Symbol
Parameter
Minimum
Typical
Maximum
Unit
Notes
V_EDV1
V_EDVF
V_SRO
V_SRD
First empty warning
Final empty warning
SR sense range
Valid discharge
0.73
-
-300
-
0.76
VEDV1 - 0.10
-
-
0.79
-
+500
-250
V SB, default
V SB, default
mV SR, V_SR + V_OS
µV VSR + VOS (see note)
Note:
VOS is affected by PC board layout. Proper layout guidelines should be followed for optimal performance.
See “Layout Considerations.”
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