LTC4150IMS#PBF Linear Technology, LTC4150IMS#PBF Datasheet - Page 10

• Manufacturer Part Number: LTC4150IMS#PBF
• Description: IC COUNTER/GAUGE GAS/BATT 10MSOP
• Manufacturer: Linear Technology

Specifications of LTC4150IMS#PBF

• Function: Fuel, Gas Gauge/Monitor
• Battery Type: Li-Ion, NiCd, NiMH
• Voltage - Supply: 2.7 V ~ 8.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS INFORMATION
LTC4150
AUTOMATIC CHARGE COUNT INTERRUPT AND CLEAR
In applications where a CLR pulse is unavailable, it’s easy to
make the LTC4150 run autonomously, as shown in Figures
5 and 6. If the microcontroller V
the battery V
in Figure 5. The only requirement is that the microcontroller
should be able to provide a high logic level of 1.9V to SHDN.
If the microcontroller V
10
DD
, INT may be directly connected to CLR, as
V
Figure 5. Application with INT Direct Drive or CLR and Separate Microprocessor Supply V
BATTERY
2.7V TO 8.5V
BATTERY
Figure 6. Application with INT Driving CLR and Separate Microprocessor Supply V
BATTERY
R
< V
SENSE
CC
CC
R
SENSE
is greater than the battery V
+
+
4.7μF
C
4.7μF
CC
F
C
F
is less than or equal to
1
2
3
4
5
SENSE
SENSE
C
C
SHDN
1
2
3
4
5
F
F
+
–
SENSE
SENSE
C
C
SHDN
F
F
+
–
LTC4150
+
–
LTC4150
+
–
GND
CLR
V
POL
INT
DD
GND
CLR
POL
V
INT
DD
10
9
8
7
6
DD
R4
R3
10
9
8
7
6
,
SHUTDOWN
C2
4.7μF
use Figure 6. The resistor dividers on CLR and SHDN keep
the voltages at these pins within the LTC4150’s V
Choose an R
using Equation 13. In either application, the LTC4150 will
capture the fi rst assertion of INT and wait at least 1μs
before resetting it. This insures that INT pulses low for at
least 1μs but gives automatic INT reset.
C2
4.7μF
R
L
R
R2
R1
L
PROCESSOR
R
L
V
μP
CC
PROCESSOR
R
L
L
V
μP
value using Equation 11 and R1-R4 values
CC
C
47μF
L
POWER-DOWN
SWITCH
C
47μF
L
POWER-DOWN
SWITCH
CC
LOAD
4150 F05
> V
CC
DD
≤ V
LOAD
4150 F06
DD
DD
range.
4150fc