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Linear Technology Electronic Components Datasheet

LTC2946 Datasheet

Charge and Energy Monitor

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LTC2946
Wide Range I2C Power,
Charge and Energy Monitor
FEATURES
DESCRIPTION
n Rail-to-Rail Input Range: 0V to 100V
n Wide Input Supply Range: 2.7V to 100V
n Shunt Regulator for Supplies >100V
n Δ∑ ADC with Less Than ±0.4% Total
Unadjusted Error
n 12-Bit Resolution for Current and Voltages
n ±1% Accurate Power and Energy Measurements
n ±0.6% Accurate Current and Charge Measurements
n Additional ADC Input Monitors an External Voltage
n Internal ±5% or External Time Bases
n Continuous Scan and Snapshot Modes
n Stores Minimum and Maximum Values
n Alerts When Limits Exceeded
n Split SDA Pin Eases Opto-Isolation
n Shutdown Mode with IQ < 40µA
n Available in 4mm × 3mm DFN and 16-Lead
MSOP Packages
APPLICATIONS
n Telecom Infrastructure
n Industrial Equipment
n General Purpose Energy Measurement
The LTC®2946 is a rail-to-rail system monitor that measures
current, voltage, power, charge and energy. It features an
operating range of 2.7V to 100V and includes a shunt regu-
lator for supplies above 100V. The current measurement
common mode range of 0V to 100V is independent of the
input supply. A 12-bit ADC measures load current, input
voltage and an auxiliary external voltage. Load current and
internally calculated power are integrated over an external
clock or crystal or internal oscillator time base for charge
and energy. An accurate time base allows the LTC2946
to provide measurement accuracy of better than ±0.6%
for charge and ±1% for power and energy. Minimum and
maximum values are stored and an overrange alert with
programmable thresholds minimizes the need for software
polling. Data is reported via a standard I2C interface.
The LTC2946 I2C interface includes separate data input
and output pins for use with standard or opto-isolated I2C
connections. The LTC2946-1 has an inverted data output
for use with inverting opto-isolator configurations.
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
property of their respective owners.
TYPICAL APPLICATION
Wide Range Power, Charge and Energy
Monitor with Onboard ADC and I2C
VIN
4V TO 100V
0.1µF
NINE I2C
ADDRESSES
ACCUMULATION
ENABLE
0.02Ω
TO
LOAD
SENSE+ SENSE
VDD GPIO3
INTVCC
SCL
ADR1 LTC2946 SDAI
ADR0
SDAO
GND ADIN
ALERT
I2C
INTERFACE
MEASURED
VOLTAGE
GPIO2
CLKIN
GPIO1
CLKOUT
GENERAL
PURPOSE
OUTPUT
OPTIONAL
CRYSTAL
TIMEBASE
2946 TA01a
ADC Total Unadjusted Error (ADIN)
0.10
0.05
0
–0.05
–0.10
0
1024
2048
CODE
3072
4096
2946 TA01b
For more information www.linear.com/LTC2946
2946fa
1


Linear Technology Electronic Components Datasheet

LTC2946 Datasheet

Charge and Energy Monitor

No Preview Available !

LTC2946
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)
SVEDND SVEo+ltVagoelt..a..g..e..................................................................................–...0–.31VV
to
to
100V
100V
SENSEVoltage......–1V or SENSE+ – 1V to SENSE+ + 1V
INTVCC Voltage
(Note 3)....................–0.3V to Lesser of 5.8V, VDD + 0.3V
ADR1, ADR0, ADIN, SDAO, SDAO, GPIO1 TO GPIO3
Voltages........................................................ –0.3V to 7V
CLKOUT Voltage.........................–0.3V to INTVCC + 0.3V
CLKIN Voltage............................................ –0.3V to 5.5V
INTVCC Clamp Current............................................35mA
SCL, SDAI Voltages (Note 4)...................... –0.3V to 5.9V
SCL, SDAI Clamp Current.........................................5mA
Operating Temperature Range
LTC2946C................................................. 0°C to 70°C
LTC2946I..............................................–40°C to 85°C
LTC2946H........................................... –40°C to 125°C
LTC2946MP....................................... –55°C TO 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MS Package Only............................................... 300°C
PIN CONFIGURATION
LTC2946
VDD
INTVCC
GPIO1
GPIO2
GPIO3
SDAO
SDAI
SCL
1
2
3
4
5
6
7
8
TOP VIEW
17
GND
16 SENSE+
15 SENSE
14 ADR1
13 ADIN
12 ADR0
11 GND
10 CLKOUT
9 CLKIN
DE PACKAGE
16-LEAD (4mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W, E PAD GND SOLDERED DOWN
EXPOSED PAD (PIN 17) IS GND, PCB GND CONNECTION IS OPTIONAL
LTC2946-1
VDD
INTVCC
GPIO1
GPIO2
GPIO3
SDAO
SDAI
SCL
1
2
3
4
5
6
7
8
TOP VIEW
17
GND
16 SENSE+
15 SENSE
14 ADR1
13 ADIN
12 ADR0
11 GND
10 CLKOUT
9 CLKIN
DE PACKAGE
16-LEAD (4mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W, E PAD GND SOLDERED DOWN
EXPOSED PAD (PIN 17) IS GND, PCB GND CONNECTION IS OPTIONAL
INGTPVVIODCD1C
1
2
3
GPIO2 4
GPIO3 5
SDAO 6
SDAI 7
SCL 8
TOP VIEW
16
15
SSEENNSSEE+–
14 ADR1
13 ADIN
12 ADR0
11 GND
10 CLKOUT
9 CLKIN
MS PACKAGE
16-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 120°C/W
INGTPVVIODCD1C
1
2
3
GPIO2 4
GPIO3 5
SDAO 6
SDAI 7
SCL 8
TOP VIEW
16
15
SSEENNSSEE+–
14 ADR1
13 ADIN
12 ADR0
11 GND
10 CLKOUT
9 CLKIN
MS PACKAGE
16-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 120°C/W
2946fa
2 For more information www.linear.com/LTC2946


Part Number LTC2946
Description Charge and Energy Monitor
Maker Linear Technology
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LTC2946 Datasheet PDF






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