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LTC2991C

Octal I2C Voltage, Current, and Temperature Monitor

Linear Technology 

LTC2991

TYPICAL APPLICATION

Parasitic Resistance Voltage and Current Monitoring with Temperature Compensation

SWITCHING

WAVEFORM

5V

1µF

INDUCTOR WITH

RPARASITIC

QUIET NODE

ILOAD

BUCK

REGULATOR

2.1k

2.1k

1µF

1µF

5V

1µF

2-WIRE I2C

INTERFACE

VCC V1

V2

SDA

V3

SCL LTC2991

ADR0

ADR1

V4

ADR2

THERMAL

COUPLING

MMBT3904

VOLTAGE, CURRENT AND TEMPERATURE CONFIGURATION

CONTROL REGISTER 0x06: 0xA1:

TAMBIENT

VLOAD

ILOAD

TRPARASITIC

VCC

REG 1A, 1B:

REG 0A, 0B:

REG 0C, 0D:

REG 1A, 1B:

REG 1C, 1D:

0.0625°C/LSB

305µV/LSB

190.75µA/LSB

0.0625°C/LSB

2.5V + 305.18µV/LSB

GND V5 TO V8 RPARASITIC ~ 4000ppm/°C

2991 TA12

TAMBIENT

4

OTHER APPS

RELATED PARTS

PART NUMBER

LTC2990

DESCRIPTION

Quad I2C Temperature, Voltage and

Current Monitor

COMMENTS

Remote and Internal Temperatures, 14-Bit Voltages and Current, Internal 10ppm/°C

Reference

LTC2997

Remote/Internal Temperature Sensor Temperature to Voltage with Integrated 1.8V Voltage Reference, ±1°C Accuracy

LTC6102/LTC6102HV Precision Zero Drift Current Sense

Amplifier

5V to 100V, 105V Absolute Maximum (LTC6102HV)

LTC1392

LTC2970

Micropower Temperature, Power Supply

and Differential Voltage Monitor

Dual I2C Power Supply Monitor and

Margining Controller

Complete Ambient Temperature Sensor Onboard

Integrated Reference and On-Chip Temperature Sensor

Sequence, Trim, Margin and Supervise Eight Power Supplies

LTC2977

LTC2945

Octal PMBus Power Supply Manager

with EEPROM

High Voltage I2C Power Monitor

Integrated Reference and On-Chip Temperature Sensor and Fault Logging

0V to 80V Range, 12-Bit Voltage and Current. Measurement with 0.75% TUE I2C Interface

Calculates 24-Bit Power Value, Stores Minimum and Maximum Values

LTC2487

16-Bit 2-, 4-Channel Delta Sigma ADC Internal Temperature Sensor

with PGA, Easy Drive™ and I2C Interface

LM134

Constant Current Source and

Temperature Sensor

Can Be Used as Linear Temperature Sensor

LTC2983

Multi-Sensor High Accuracy Digital

Temperature Measurement System

0.1°C Accuracy, Directly Digitize RTDs, Thermocouples, Thermistors and Diodes, 20

Flexible Inputs

32 Linear Technology Corporation

1630 McCarthy Blvd., Milpitas,

(408) 432-1900 ● FAX: (408) 434-0507

C●Aww9w5.0Flion3re5am-r.7co4orem1i7/nLfToCrm29a9ti1on

www.linear.com/LTC2991

2991ff

LT 1015 REV F • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 2011

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