LTC2991_15 Datasheet, PDF (1/32 Pages) Linear Technology – Octal I2C Voltage, Current, and Temperature Monitor

Features
n _{Measures Voltage, Current, Temperature}
n _{Measures Four Remote Diode Temperatures}
n _{0.7°C (Typ) Accuracy, 0.06°C Resolution}
n _{1°C (Typ) Internal Temperature Sensor}
n _{Series Resistance Cancellation}
n _{14-Bit ADC Measures Voltage/Current}
n _{PWM Temperature Output}
n _{3V to 5.5V Supply Operating Voltage}
n _{Eight Selectable Addresses}
n _{Internal 10ppm/°C Voltage Reference}
n _{V1 to V8 Inputs ESD Rated to 6kV HBM}
n _{16-Lead MSOP Package}
Applications
n _{Temperature Measurement}
n _{Supply Voltage Monitoring}
n _{Current Measurement}
n _{Remote Data Acquisition}
n _{Environmental Monitoring}
LTC2991
Octal I²C Voltage, Current,
and Temperature Monitor
Description
The LTC^®2991 is used to monitor system temperatures,
voltages and currents. Through the I²C serial interface, the
eight monitors can individually measure supply voltages
and can be paired for differential measurements of cur-
rent sense resistors or temperature sensing transistors.
Additional measurements include internal temperature
and internal V_CC. The internal 10ppm reference minimizes
the number of supporting components and area required.
Selectable address and configurable functionality give the
LTC2991 flexibility to be incorporated in various systems
needing temperature, voltage or current data. The LTC2991
fits well in systems needing submillivolt voltage resolution,
1% current measurement and 1°C temperature accuracy
or any combination of the three.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Easy Drive
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Typical Application
5V
3.3V
2.5V
R_SENSE
1.2V
3.3V I/O
2.5V I/O
1.2V CORE
2-WIRE
I²C INTERFACE
T_AMBIENT
V_CC V1
V2 V3 V4
SDA
V5
SCL
LTC2991
ADR0
V6
ADR1
ADR2
V7
GND
V8
PWM
2991 TA01a
FPGA
FPGA
TEMPERATURE
BOARD
TEMPERATURE
TO FAN
Temperature Total Unadjusted Error
1.00
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
T_REMOTE
T_INTERNAL
–1.00
–50 –25 0
25 50 75
T_AMBIENT (°C)
100 125 150
2991 TA01b
For more information www.linear.com/LTC2991
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