LTC4150CMS Просмотр технического описания (PDF) - Linear Technology

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LTC4150CMS

Coulomb Counter/Battery Gas Gauge

Linear Technology 

LTC4150

PIN FUNCTIONS

SENSE+ (Pin 1): Positive Sense Input. This is the nonin-

verting current sense input. Connect SENSE+ to the load

and charger side of the sense resistor. Full-scale current

sense input is 50mV. SENSE+ must be within 60mV of

VDD for proper operation.

SENSE– (Pin 2): Negative Sense Input. This is the inverting

current sense input. Connect SENSE– to the positive bat-

tery terminal side of the sense resistor. Full-scale current

sense input is 50mV. SENSE– must be within 60mV of VDD

for proper operation.

CF+ (Pin 3): Filter Capacitor Positive Input. A capacitor

connected between CF+ and CF– filters and averages

noise and fast battery current variations. A 4.7μF value

is recommended. If filtering is not desired, leave CF+ and

CF– unconnected.

CF– (Pin 4): Filter Capacitor Negative Input. A capacitor

connected between CF+ and CF– filters and averages

noise and fast battery current variations. A 4.7μF value

is recommended. If filtering is not desired, leave CF+ and

CF– unconnected.

SHDN (Pin 5): Shutdown Digital Input. When asserted low,

SHDN forces the LTC4150 into its low current consumption

power-down mode and resets the part. In applications

with logic supply VCC > VDD, a resistive divider must be

used between SHDN and the logic which drives it. See the

Applications Information section.

POL (Pin 6): Battery Current Polarity Open-Drain Output.

POL indicates the most recent battery current polarity when

INT is high. A low state indicates the current is flowing out

of the battery while high impedance means the current

is going into the battery. POL latches its state when INT

is asserted low. POL is an open-drain output and can be

pulled up to any logic supply up to 9V. In shutdown, POL

is high impedance.

GND (Pin 7): Ground. Connect directly to the negative

battery terminal.

VDD (Pin 8): Positive Power Supply. Connect to the load

and charger side of the sense resistor. SENSE+ also con-

nects to VDD. VDD operating range is 2.7V to 8.5V. Bypass

VDD with 4.7μF capacitor.

CLR (Pin 9): Clear Interrupt Digital Input. When asserted

low for more than 20μs, CLR resets INT high. Charge

counting is unaffected. INT may be directly connected to

CLR. In this case the LTC4150 will capture each assertion

of INT and wait at least 1μs before resetting it. This ensures

that INT pulses low for at least 1μs but gives automatic

INT reset. In applications with a logic supply VCC > VDD,

a resistive divider must be used between INT and CLR.

See the Applications Information section.

INT (Pin 10): Charge Count Interrupt Open-Drain Output.

INT latches low every 1/(VSENSE • GVF) seconds and is

reset by a low pulse at CLR. INT is an open-drain output

and can be pulled up to any logic supply of up to 9V. In

shutdown INT is high impedance.

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