LTC2946
2
Wide Range I C Power,
Charge and Energy Monitor
FEATURES DESCRIPTION
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Rail-to-Rail Input Range: 0V to 100V The LTC 2946 is a rail-to-rail system monitor that measures
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Wide Input Supply Range: 2.7V to 100V current, voltage, power, charge and energy. It features an
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Shunt Regulator for Supplies >100V operating range of 2.7V to 100V and includes a shunt regu-
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ADC with Less Than 0.4% Total lator for supplies above 100V. The current measurement
Unadjusted Error common mode range of 0V to 100V is independent of the
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12-Bit Resolution for Current and Voltages input supply. A 12-bit ADC measures load current, input
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1% Accurate Power and Energy Measurements voltage and an auxiliary external voltage. Load current and
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0.6% Accurate Current and Charge Measurements internally calculated power are integrated over an external
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Additional ADC Input Monitors an External Voltage clock or crystal or internal oscillator time base for charge
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Internal 5% or External Time Bases and energy. An accurate time base allows the LTC2946
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Continuous Scan and Snapshot Modes to provide measurement accuracy of better than 0.6%
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Stores Minimum and Maximum Values for charge and 1% for power and energy. Minimum and
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Alerts When Limits Exceeded maximum values are stored and an overrange alert with
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Split SDA Pin Eases Opto-Isolation programmable thresholds minimizes the need for software
2
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Shutdown Mode with I < 40A polling. Data is reported via a standard I C interface.
Q
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Available in 4mm 3mm DFN and 16-Lead
2
The LTC2946 I C interface includes separate data input
MSOP Packages
2
and output pins for use with standard or opto-isolated I C
connections. The LTC2946-1 has an inverted data output
APPLICATIONS
for use with inverting opto-isolator configurations.
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Telecom Infrastructure L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
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Industrial Equipment
property of their respective owners.
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General Purpose Energy Measurement
TYPICAL APPLICATION
Wide Range Power, Charge and Energy
2
ADC Total Unadjusted Error (ADIN)
Monitor with Onboard ADC and I C
0.02 0.10
V TO
IN
4V TO 100V LOAD
+
SENSE SENSE
V GPIO3 ALERT 0.05
DD
2
INTV SCL
CC I C
0.1F
INTERFACE
ADR1 SDAI
LTC2946
0
2
NINE I C
ADR0 SDAO
ADDRESSES
MEASURED
GND ADIN
VOLTAGE
ACCUMULATION
0.05
GPIO2 GPIO1 GENERAL
ENABLE
PURPOSE
CLKIN CLKOUT
OUTPUT
0.10
OPTIONAL
0 1024 2048 3072 4096
CRYSTAL
CODE
TIMEBASE
2946 TA01a
2946 TA01b
2946fa
1
For more information www.linear.com/LTC2946
ADC TUE (%)LTC2946
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)
V Voltage .............................................. 0.3V to 100V SCL, SDAI Voltages (Note 4) ..................... 0.3V to 5.9V
DD
+
SENSE Voltage ...........................................1V to 100V SCL, SDAI Clamp Current ........................................5mA
+ +
SENSE Voltage .....1V or SENSE 1V to SENSE + 1V Operating Temperature Range
INTV Voltage LTC2946C ................................................ 0C to 70C
CC
(Note 3) ...................0.3V to Lesser of 5.8V, V + 0.3V LTC2946I .............................................40C to 85C
DD
ADR1, ADR0, ADIN, SDAO, SDAO, GPIO1 TO GPIO3 LTC2946H .......................................... 40C to 125C
Voltages ....................................................... 0.3V to 7V LTC2946MP ......................................55C TO 125C
CLKOUT Voltage ........................0.3V to INTV + 0.3V Storage Temperature Range .................. 65C to 150C
CC
CLKIN Voltage ........................................... 0.3V to 5.5V Lead Temperature (Soldering, 10 sec)
INTV Clamp Current ...........................................35mA MS Package Only ..............................................300C
CC
PIN CONFIGURATION
LTC2946
TOP VIEW
+
V 1 16
SENSE
DD
TOP VIEW
INTV 2 15 SENSE
CC
+
V 1 16 SENSE
DD
GPIO1 3 14 ADR1
INTV 2 15 SENSE
CC
17
GPIO2 4 13 ADIN GPIO1 3 14 ADR1
GND GPIO2 4 13 ADIN
GPIO3 5 12
ADR0
GPIO3 5 12 ADR0
SDAO 6 11
GND
SDAO 6 11 GND
SDAI 7 10 CLKOUT
SDAI 7 10 CLKOUT
SCL 8 9 CLKIN
SCL 8 9 CLKIN
MS PACKAGE
16-LEAD PLASTIC MSOP
DE PACKAGE
16-LEAD (4mm 3mm) PLASTIC DFN
T = 125C, = 120C/W
JMAX JA
T = 125C, = 43C/W, E PAD GND SOLDERED DOWN
JMAX JA
EXPOSED PAD (PIN 17) IS GND, PCB GND CONNECTION IS OPTIONAL
LTC2946-1
TOP VIEW
+ TOP VIEW
V 1 16 SENSE
DD
+
V 1 16 SENSE
INTV 2 15 DD
SENSE
CC
INTV 2 15 SENSE
CC
GPIO1 3 14
ADR1
GPIO1 3 14 ADR1
17
GPIO2 4 13 ADIN GPIO2 4 13 ADIN
GND GPIO3 5 12 ADR0
GPIO3 5 12 ADR0
SDAO 6 11 GND
SDAO 6 11 GND SDAI 7 10 CLKOUT
SCL 8 9 CLKIN
SDAI 7 10
CLKOUT
MS PACKAGE
SCL 8 9
CLKIN
16-LEAD PLASTIC MSOP
DE PACKAGE
T = 125C, = 120C/W
JMAX JA
16-LEAD (4mm 3mm) PLASTIC DFN
T = 125C, = 43C/W, E PAD GND SOLDERED DOWN
JMAX JA
EXPOSED PAD (PIN 17) IS GND, PCB GND CONNECTION IS OPTIONAL
2946fa
2
For more information www.linear.com/LTC2946