LTC2945 Datasheet PDF - Linear
| Part Number | LTC2945 | |
| Description | Wide Range I2C Power Monitor | |
| Manufacturers | Linear | |
| Logo |  |
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LTC2945
Wide Range
I2C Power Monitor
FEATURES
n Rail-to-Rail Input Range: 0V to 80V
n Wide Input Supply Range: 2.7V to 80V
n Shunt Regulator for Supplies >80V
n Δ∑ ADC with less than ±0.75% Total Unadjusted Error
n 12-Bit Resolution for Current and Voltages
n Internal Multiplier Calculates 24-Bit Power Value
n Stores Minimum and Maximum Values
n Alerts When Limits Exceeded
n Additional ADC Input Monitors an External Voltage
n Continuous Scan and Snapshot Modes
n Shutdown Mode with IQ < 80µA
n Split SDA for Opto-Isolation
n Available in 12-Lead 3mm × 3mm QFN and MSOP
Packages
APPLICATIONS
n Telecom Infrastructure
n Industrial
n Automotive
n Consumer
DESCRIPTION
The LTC®2945 is a rail-to-rail system monitor that mea-
sures current, voltage, and power. It features an operating
range of 2.7V to 80V and includes a shunt regulator for
supplies above 80V to allow flexibility in the selection of
input supply. The current measurement range of 0V to
80V is independent of the input supply. An onboard 0.75%
accurate 12-bit ADC measures load current, input voltage
and an auxiliary external voltage. A 24-bit power value is
generated by digitally multiplying the measured 12-bit load
current and input voltage data. Minimum and maximum
values are stored and an overrange alert with program-
mable thresholds minimizes the need for software polling.
Data is reported via a standard I2C interface. Shutdown
mode reduces power consumption to 20µA.
The LTC2945 I2C interface includes separate data input
and output pins for use with standard or opto-isolated I2C
connections. The LTC2945-1 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 of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Wide Range Power Monitor with Onboard ADC and I2C
VIN
4V TO 80V
0.02Ω
TO
LOAD
ADC Differential
Nonlinearity (ADIN)
0.3
0.1µF
NINE I2C
ADDRESSES
SENSE+ SENSE–
VDD ALERT
LTC2945
INTVCC
SCL
ADR1
ADR0
GND
SDAI
SDAO
ADIN
2945 TA01
I2C
INTERFACE
MEASURED
VOLTAGE
0.2
0.1
0.0
–0.1
–0.2
–0.3
0
1024
2048
CODE
3072
4096
2945 TA01a
ADC Integral Nonlinearity
(ADIN)
0.3
0.2
0.1
0.0
–0.1
–0.2
–0.3
0
1024
2048
CODE
3072
4096
2945 TA01b
For more information www.linear.com/LTC2945
2945fb
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LTC2945
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VDD is from 4V to 80V unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
I2C INTERFACE TIMING
fSCL(MAX)
tLOW
Maximum SCL Clock Frequency
Minimum SCL Low Period
400
0.65 1.3
tHIGH
tBUF(MIN)
Minimum SCL High Period
Minimum Bus Free Time Between Stop/Start
Condition
50 600
0.12 1.3
tHD,STA(MIN)
Minimum Hold Time After (Repeated) Start
Condition
140 600
tSU,STA(MIN)
Minimum Repeated Start Condition Set-Up
Time
30 600
tSU,STO(MIN)
tHD,DATI(MIN)
tHD,DATO(MIN)
tSU,DAT(MIN)
tSP(MAX)
tRST
CX
Minimum Stop Condition Set-Up Time
Minimum Data Hold Time Input
Minimum Data Hold Time Output
Minimum Data Set-Up Time
Maximum Suppressed Spike Pulse Width
Stuck Bus Reset Time
SCL, SDAI Input Capacitance (Note 5)
SCL or SDAI Held Low
30 600
–100 0
300 600 900
30 100
50 110 250
25 33
5 10
UNITS
kHz
µs
ns
µs
ns
ns
ns
ns
ns
ns
ns
ms
pF
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into pins are positive. All voltages are referenced to
ground, unless otherwise noted.
Note 3: An internal shunt regulator limits the INTVCC pin to a minimum of
5.9V. Driving this pin to voltages beyond 5.9V may damage the part. This
pin can be safely tied to higher voltages through a resistor that limits the
current below 35mA.
Note 4: Internal clamps limit the SCL and SDAI pins to a minimum of 5.9V.
Driving these pins to voltages beyond the clamp may damage the part. The
pins can be safely tied to higher voltages through resistors that limit the
current below 5mA.
Note 5: Guaranteed by design and not subject to test.
Note 6:
TUE
=
(ACTUAL
CODE −IDEAL
4096
CODE)
×
100%
where IDEAL CODE is derived from a straight line passing through Code 0
at 0V and Theoretical Code of 4096 at VFS.
Note 7: ∆SENSE is defined as VSENSE+ – VSENSE–
For more information www.linear.com/LTC2945
2945fb
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for LTC2945 electronic component. |
| Information | Total 30 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ LTC2945.PDF Datasheet ] | |
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