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LTC2945CUD#PBF

Description
Monitor 4V to 80V Automotive 12-Pin QFN EP Tube
File Size777KB,34 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LTC2945CUD#PBF Overview

Monitor 4V to 80V Automotive 12-Pin QFN EP Tube

LTC2945CUD#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
TypeMonitor
Input Voltage (V)2.7 to 80
Minimum Operating Supply Voltage (V)4
Maximum Operating Supply Voltage (V)80
Maximum Supply Current (mA)1.2
Minimum Operating Temperature (°C)0
Maximum Operating Temperature (°C)70
Supplier Temperature GradeCommercial
PackagingTube
Standard Package NameQFN
Pin Count12
Supplier PackageQFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length3
Package Width3
PCB changed12
Lead ShapeNo Lead
LTC2945
Wide Range
I
2
C Power Monitor
FEATURES
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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 I
2
C interface. Shutdown
mode reduces power consumption to 20µA.
The LTC2945 I
2
C interface includes separate data input
and output pins for use with standard or opto-isolated I
2
C
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.
Rail-to-Rail Input Range: 0V to 80V
Wide Input Supply Range: 2.7V to 80V
Shunt Regulator for Supplies >80V
Δ∑ ADC with less than ±0.75% Total Unadjusted Error
12-Bit Resolution for Current and Voltages
Internal Multiplier Calculates 24-Bit Power Value
Stores Minimum and Maximum Values
Alerts When Limits Exceeded
Additional ADC Input Monitors an External Voltage
Continuous Scan and Snapshot Modes
Shutdown Mode with I
Q
< 80µA
Split SDA for Opto-Isolation
Available in 12-Lead 3mm
×
3mm QFN and MSOP
Packages
APPLICATIONS
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Telecom Infrastructure
Industrial
Automotive
Consumer
TYPICAL APPLICATION
Wide Range Power Monitor with Onboard ADC and I
2
C
V
IN
4V TO 80V
0.02
TO
LOAD
0.3
0.2
0.1
0.0
–0.1
–0.2
–0.3
ADC Differential
Nonlinearity (ADIN)
0.3
0.2
0.1
0.0
–0.1
–0.2
–0.3
ADC Integral Nonlinearity
(ADIN)
SENSE
+
V
DD
0.1µF
NINE I
2
C
ADDRESSES
SENSE
ADC DNL (LSB)
ALERT
SCL
SDAI
SDAO
ADIN
I
2
C
INTERFACE
MEASURED
VOLTAGE
INTV
CC
ADR1
ADR0
LTC2945
GND
2945 TA01
0
ADC INL (LSB)
1024
2048
CODE
3072
4096
2945 TA01a
0
1024
2048
CODE
3072
4096
2945 TA01b
2945fb
For more information
www.linear.com/LTC2945
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