LTC2942C(RevA) View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC2942C
(Rev.:RevA)

Battery Gas Gauge with Temperature, Voltage Measurement

Linear Technology 

LTC2942

Pin Functions

SENSE+ (Pin 1): Positive Current Sense Input and Power

Supply. Connect to the load/charger side of the sense

resistor. VSENSE+ operating range is 2.7V to 5.5V.

GND (Pin 2): Device Ground. Connect directly to the nega-

tive battery terminal.

SCL (Pin 3): Serial Bus Clock Input.

SDA (Pin 4): Serial Bus Data Input and Output.

AL/CC (Pin 5): Alert Output or Charge Complete Input.

Configured either as an SMBus alert output or charge

complete input by control register bits B[2:1]. At power-up,

the pin defaults to alert mode conforming to the SMBus

alert response protocol. It behaves as an open-drain logic

output that pulls to GND when any threshold register value

is exceeded. When configured as a charge complete input,

connect to the charge complete output from the battery

charger circuit. A high level at CC sets the value of the

accumulated charge (registers C, D) to FFFFh.

SENSE– (Pin 6): Negative Current Sense Input. Connect

SENSE– to the positive battery terminal side of the sense

resistor. The voltage between SENSE– and SENSE+ must

remain within ±50mV in normal operation. SENSE– is also

the input for the ADC in voltage measurement mode.

Exposed Pad (Pin 7): Do Not Connect.

Block Diagram

SENSE+

1

VSUPPLY

TEMPERATURE

SENSOR

MUX

SENSE–

6

GND

2

LTC2942

COULOMB COUNTER

REF

CLK

REFERENCE

GENERATOR

OSCILLATOR

REF+

CLK

IN

ADC

REF–

CC

ACCUMULATED

CHARGE

REGISTER

DATA AND

CONTROL

REGISTERS

AL AL/CC

5

I2C/

SMBus

SCL

3

SDA

4

2942 BD

2942fa

6

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