LTC4150 データシートの表示（PDF） - Linear Technology
部品番号
コンポーネント説明
メーカー
LTC4150 Datasheet PDF : 14 Pages
| |||
LTC4150
APPLICATIONS INFORMATION
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 VCC is less than or equal to
the battery VDD, INT may be directly connected to CLR, as
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 VCC is greater than the battery VDD,
use Figure 6. The resistor dividers on CLR and SHDN keep
the voltages at these pins within the LTC4150’s VDD range.
Choose an RL value using Equation 11 and R1-R4 values
using Equation 13. In either application, the LTC4150 will
capture the first 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.
PROCESSOR
VCC
POWER-DOWN
SWITCH
CL
47μF
LOAD
RSENSE
2.7V TO 8.5V +
BATTERY
CF
4.7μF
1 SENSE+
INT 10
LTC4150 CLR 9
2 SENSE–
8
VDD
3 CF+
7
GND
4 CF–
5 SHDN
6
POL
RL RL
C2
4.7μF
μP
4150 F05
Figure 5. Application with INT Direct Drive or CLR and Separate Microprocessor Supply VCC ≤ VDD
PROCESSOR
VCC
POWER-DOWN
SWITCH
CL
47μF
LOAD
RSENSE
+
BATTERY
VBATTERY < VCC
CF
4.7μF
1 SENSE+
INT 10
LTC4150 CLR 9
2 SENSE–
8
VDD
3 CF+
7
GND
4 CF–
5 SHDN
6
POL
RL
R2
C2
4.7μF
R1
SHUTDOWN
R4
RL
μP
R3
4150 F06
Figure 6. Application with INT Driving CLR and Separate Microprocessor Supply VCC > VDD
4150fc
10
Share Link: 