LTC4150

10

4150fc

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

in Figure 5. The only requirement is that the microcontroller

should be able to provide a high logic level of 1.9V to SHDN.

use Figure 6. The resistor dividers on CLR and SHDN keep

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.

INT

SHDN

CLR

POL

LTC4150

μP

C2

4.7μF

10

9

8

7

6

1

2

5

4150 F05

GND

PROCESSOR

POWER-DOWN

SWITCH

47μF

LOAD

+

+

–

3

4

4.7μF

2.7V TO 8.5V

BATTERY

INT

SHDN

SHUTDOWN

R4

R3

CLR

POL

LTC4150

μP

C2

4.7μF

10

9

8

7

6

1

2

5

4150 F06

GND

PROCESSOR

POWER-DOWN

SWITCH

47μF

LOAD

+

+

–

3

4

4.7μF

BATTERY

R2

R1