LTC4150(RevA) Просмотр технического описания (PDF) - Linear Technology

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LTC4150
(Rev.:RevA)

Coulomb Counter/Battery Gas Gauge

Linear Technology 

LTC4150

APPLICATIO S I FOR ATIO

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 applica-

tion, 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+

10

INT

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 of CLR and Separate Microprocessor Supply VCC ≤ VDD

PROCESSOR

VCC

RSENSE

+

BATTERY

VBATTERY < VCC

CF

4.7µF

1 SENSE+

10

INT

LTC4150 CLR 9

2 SENSE–

8

VDD

3 CF+

7

GND

4 CF–

5

SHDN

6

POL

RL RL

R2

C2

4.7µF

R1

µP

SHUTDOWN

R4

POWER-DOWN

SWITCH

CL

47µF

LOAD

R3

4150 F06

Figure 6. Application with INT Driving CLR and Separate Microprocessor Supply VCC > VDD

4150fa

9

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