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Linear Technology Electronic Components Datasheet

LTC2947 Datasheet

30A Power/Energy Monitor

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LTC2947
30A Power/Energy Monitor
with Integrated Sense Resistor
FEATURES
nn Measures Current, Voltage, Power, Charge, Energy
nn ±30A Current Range with Low 9mA Offset
nn Integrated 300µΩ Sense Resistor
nn 0V to 15V Input Range Independent of Supply Voltage
nn Instantaneous Multiplication of Voltage and Current
nn 0.5% Voltage Accuracy
nn 1% Current and Charge Accuracy
nn 1.2% Power and Energy Accuracy
nn Alerts When Thresholds Exceeded
nn Stores Maximum and Minimum Values
nn
nn
SI2hCu/StdPoIwCnomMpoadteibwleitIhntIeQr<fa1ce0μA
nn Available in 32-Lead 4mm × 6mm QFN Package
APPLICATIONS
nn Servers
nn Telecom Infrastructure
nn Industrial
nn Electric Vehicles
nn Photovoltaics
DESCRIPTION
The LTC®2947 is a high precision power and energy moni-
tor with an internal sense resistor supporting up to ±30A.
Three internal No Latency Δ∑™ ADCs ensure accurate
measurement of voltage and current, while high-bandwidth
analog multiplication of voltage and current provides ac-
curate power measurement in a wide range of applications.
Internal or external clocking options enable precise charge
and energy measurements.
An internal 300µΩ, temperature-compensated sense
resistor minimizes efficiency loss and external compo-
nents, simplifying energy measurement applications while
enabling high accuracy current measurement over the full
temperature range.
All measured quantities are stored in internal registers ac-
cessible via the selectable I2C/SPI interface. The LTC2947
features programmable high and low thresholds for all
measured quantities to reduce digital traffic with the host.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents, including 8907703, 8841962.
TYPICAL APPLICATION
0V TO 15V
IP 300µΩ IM
–30A TO 30A
5V AVCC
1µF
AGND
VP
DVCC LTC2947
1µF
DGND
VM
CFP
1µF
CFM
BYP
1µF AD1
AD0
CLKI
OVDD
SCL
SDI
SDO
ALERT
CLKO
LOAD
5V
SDI
SDA
I2C
INTERFACE
2947 TA01a
Energy Measurement Total Unadjusted
Error vs Current, VP – VM = 12V
0.5
0.4
INTERNAL CLOCK
EXTERNAL CLOCK
0.3
0.2
0.1
0.0
–0.1
–0.2
–0.3
–0.4
–0.5
0
10 20
ISENSE (A)
30
2947 TA01b
Document Feedback
For more information www.analog.com
Rev. B
1


Linear Technology Electronic Components Datasheet

LTC2947 Datasheet

30A Power/Energy Monitor

No Preview Available !

LTC2947
TABLE OF CONTENTS
Description......................................................................................................................... 1
Absolute Maximum Ratings...................................................................................................... 3
Order Information.................................................................................................................. 3
Pin Configuration.................................................................................................................. 3
Electrical Characteristics......................................................................................................... 4
Timing Diagrams.................................................................................................................. 7
Typical Performance Characteristics........................................................................................... 8
Pin Functions......................................................................................................................10
Block Diagram.....................................................................................................................11
Operation.......................................................................................................................... 12
Overview................................................................................................................................................................ 12
Modes of Operation............................................................................................................................................... 12
Current, Voltage and Temperature Measurement................................................................................................... 14
Power Measurement.............................................................................................................................................. 14
Charge, Energy Measurement and Accumulated Time .......................................................................................... 14
Applications Information........................................................................................................15
TimeBase: Internal/External Clock/Crystal............................................................................................................ 15
Configuring the GPIO Pin....................................................................................................................................... 15
Internal Sense Resistor.......................................................................................................................................... 16
Current and Voltage Input Filtering........................................................................................................................ 16
Layout Considerations........................................................................................................................................... 17
Digital Interface...................................................................................................................19
Selecting SPI or I2C Serial Interface...................................................................................................................... 19
SPI Mode .............................................................................................................................................................. 19
I2C Mode .............................................................................................................................................................. 22
Register Map......................................................................................................................25
Register Description.............................................................................................................26
Register Naming Conventions............................................................................................................................... 26
Paging Mechanism................................................................................................................................................ 26
PAGE Control......................................................................................................................................................... 26
Operation Control.................................................................................................................................................. 26
Register Map PAGE0.............................................................................................................................................. 27
Register Map PAGE1.............................................................................................................................................. 38
Typical Applications..............................................................................................................40
Package Description.............................................................................................................42
Revision History..................................................................................................................43
Typical Application...............................................................................................................44
Related Parts......................................................................................................................44
Rev. B
2 For more information www.analog.com


Part Number LTC2947
Description 30A Power/Energy Monitor
Maker Linear Technology
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LTC2947 Datasheet PDF






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