eight monitors can individually measure supply voltages
and can be paired for differential measurements of cur-
rent sense resistors or temperature sensing transistors.
Additional measurements include internal temperature
and internal V
CC
. The internal 10ppm reference minimizes
the number of supporting components and area required.
Selectable address and configurable functionality give the
LTC2991 flexibility to be incorporated in various systems
needing temperature, voltage or current data. The LTC2991
fits well in systems needing submillivolt voltage resolution,
1% current measurement and 1°C temperature accuracy
or any combination of the three.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Easy Drive
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Measures Voltage, Current, Temperature
Measures Four Remote Diode Temperatures
0.7°C (Typ) Accuracy, 0.06°C Resolution
1°C (Typ) Internal Temperature Sensor
Series Resistance Cancellation
14-Bit ADC Measures Voltage/Current
PWM Temperature Output
3V to 5.5V Supply Operating Voltage
Eight Selectable Addresses
Internal 10ppm/°C Voltage Reference
V1 to V8 Inputs ESD Rated to 6kV HBM
16-Lead MSOP Package
APPLICATIONS
n
n
n
n
n
Temperature Measurement
Supply Voltage Monitoring
Current Measurement
Remote Data Acquisition
Environmental Monitoring
TYPICAL APPLICATION
5V
3.3V
2.5V
1.2V
R
SENSE
3.3V I/O
2.5V I/O
1.2V CORE
FPGA
T
ERROR
(°C)
Temperature Total Unadjusted Error
1.00
0.75
0.50
0.25
0
T
INTERNAL
T
REMOTE
V
CC
V1
SDA
2-WIRE
I
2
C INTERFACE
SCL
ADR0
ADR1
ADR2
V2
V3
V4
V5
–0.25
–0.50
–0.75
LTC2991
V6
FPGA
TEMPERATURE
V7
T
AMBIENT
V8
GND
PWM
2991 TA01a
BOARD
TEMPERATURE
–1.00
–50 –25
0
25 50 75
T
AMBIENT
(°C)
100 125 150
2991 TA01b
TO FAN
2991ff
For more information
www.linear.com/LTC2991
1
LTC2991
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
V1
V2
V3
V4
V5
V6
V7
V8
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
ADR2
ADR1
ADR0
PWM
SCL
SDA
GND
Supply Voltage (V
CC
) ................................ –0.3V to 6.0V
Input Voltages V1, V2, V3, V4, V5, V6, V7, V8,
SCL, ADR0, ADR1, ADR2 ..............–0.3V to (V
CC
+ 0.3V)
Output Voltage PWM ....................–0.3V to (V
CC
+ 0.3V)
Output Voltage SDA ..................................... –0.3V to 6V
Operating Temperature Range
LTC2991C ................................................ 0°C to 70°C
LTC2991I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MS Package .......................................................... 300°C
MS PACKAGE
16-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 120°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC2991CMS#PBF
LTC2991IMS#PBF
TAPE AND REEL
LTC2991CMS#TRPBF
LTC2991IMS#TRPBF
PART MARKING*
2991
2991
PACKAGE DESCRIPTION
16-Lead Plastic MSOP
16-Lead Plastic MSOP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
ELECTRICAL CHARACTERISTICS
SYMBOL
General
V
CC
I
CC
I
SD
V
CC(UVL)
T
INTERNAL(TUE)
T
RMT(TUE)
V
CC(TUE)
V
N(TUE)
V
DIFF(TUE)
V
DIFF(MAX)
V
OFFSET_DIFF
V
OFFSET_SE
Input Supply Range
Input Supply Current
Input Supply Current
Input Supply Undervoltage Lockout
PARAMETER
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
CC
= 3.3V, unless otherwise noted.
CONDITIONS
l
MIN
2.9
TYP
MAX
5.5
UNITS
V
mA
µA
V
°C
°C
%
%
%
mV
LSB
LSB
2991ff
During Conversion, I
2
C Inactive
Shutdown Mode, I
2
C Inactive
l
l
l
1.1
1
1.3
2.0
±1
1.5
6
2.6
±3.5
±1.5
±0.25
±0.25
±0.75
312.5
Measurement Accuracy
Internal Temperature Total Unadjusted Error
Remote Diode Temperature Total Unadjusted
Error
V
CC
Voltage Total Unadjusted Error
V1 Through V8 Total Unadjusted Error
Differential Voltage Total Unadjusted Error
V1 – V2, V3 – V4, V5 – V6, V7 – V8
Full-Scale Differential Voltage
Differential Offset
Single-Ended Offset
V1 through V8 = 0V
V1 through V8 = 0V
η
= 1.004
2.9V ≤ 5.5V
0V ≤ 4.9V
–300mV≤ V
D
≤300mV
l
l
l
l
l
l
l
±0.7
±0.05
±0.05
±0.1
–312.5
–12.5
–6
0
0
12.5
6
2
For more information
www.linear.com/LTC2991
LTC2991
ELECTRICAL CHARACTERISTICS
SYMBOL
V
DIFF(CMR)
V
LSB(DIFF)
V
LSB(SINGLE_ENDED)
V
LSB(TEMP)
V
LSB(DIODE_VOLTAGE)
T
NOISE
T
NOISE
RES
INL
PARAMETER
Differential Voltage Common Mode Range
Differential Voltage LSB Weight
Single-Ended Voltage LSB Weight
Temperature LSB Weight
Diode Voltage LSB Weight
Temperature Noise
Temperature Noise
Resolution (No Missing Codes)
Integral Nonlinearity
Celsius or Kelvin
Includes Series Resistance IR Drop
Celsius or Kelvin Filter Disengaged
Celsius or Kelvin Filter Engaged
(Note 2)
2.9V ≤ V
CC
≤ 5.5V, V
IN(CM)
= 1.5V
(Note 2)
Single-Ended
Differential
(Note 2)
(0 ≤ V
N
≤ 4.9V) (Note 2)
(0 ≤ V
N
≤ V
CC
)
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
CC
= 3.3V, unless otherwise noted.
CONDITIONS
l
MIN
0
TYP
19.075
305.18
0.0625
38.15
0.2
0.07
MAX
V
CC
UNITS
V
µV
µV
Deg
µV
°RMS
°RMS
Bits
14
l
l
–2
–2
0.35
0.6
–10
0.9
0
32
2
2
LSB
LSB
pF
µA
C
IN
I
IN(AVG)
I
DC_LEAK(VIN)
PWM
F
PWM
DC
PWM
SCALE
PWM
Measurement Delay
T
INTERNAL
, T
R1
, T
R2
,
T
R3
, T
R4
V1, V2, V3, V4, V5,
V6, V7, V8
V1 – V2, V3 – V4,
V5 – V6, V7 – V8
V
CC
Max Delay
V1 Through V8 Input Sampling Capacitance
V1 Through V8 Input Average Sampling
Current
V1 Through V8 Input Leakage Current
PWM Period
Duty Cycle Range
0% to 100% PWM Temperature Range
Per Configured Temperature
Measurement
Single-Ended Voltage Measurement
Differential Voltage Measurement
V
CC
Measurement
Mode[4:0] = 11101, T
INTERNAL
, T
R1
, T
R2
, T
R3
,
T
R4
V
CC
Output Current
Output Voltage
ADR Input Low Threshold Voltage
ADR Input High Threshold Voltage
SDA Low Level Maximum Voltage
Maximum Low Level Input Voltage
Minimum High Level Input Voltage
SDA, SCL Input Current
Maximum ADR0, ADR1, ADR2 Input Current
10
1.2
99.8
nA
ms
%
Deg
l
l
l
l
l
l
l
37
0.9
0.9
0.9
46
1.5
1.5
1.5
55
1.8
1.8
1.8
277
ms
ms
ms
ms
ms
V1, V3, V5, V7 OUTPUT (Remote Diode Mode Only)
I
OUT
V
OUT
I
2
C Interface
V
ADR(L)
V
ADR(H)
V
OL1
V
IL
V
IH
I
SDAI, SCLI
I
ADR(MAX)
Falling
Rising
I
O
= –3mA, V
CC
2.9V to 5.5V
SDA and SCL Pins
SDA and SCL Pins
0 < V
SDA, SCL
< V
CC
ADR0, ADR1 or ADR2 Tied to V
CC
or GND
l
l
l
l
l
l
l
Remote Diode Mode
l
l
260
0
350
V
CC
0.3•V
CC
µA
V
V
V
V
V
V
µA
µA
0.7•V
CC
0.4
0.3•V
CC
0.7•V
CC
±1
±1
2991ff
For more information
www.linear.com/LTC2991
3
LTC2991
ELECTRICAL CHARACTERISTICS
SYMBOL
I
2
C Timing (Note 2)
f
SCL(MAX)
t
LOW
t
HIGH
t
BUF(MIN)
t
HD, STA(MIN)
t
SU, STA(MIN)
t
SU, STO(MIN)
t
HD, DATI(MIN)
t
HD, DATO(MIN)
t
SU, DAT(MIN)
t
SP(MAX)
C
X
Maximum SCL Clock Frequency
Minimum SCL Low Period
Minimum SCL High Period
Minimum Bus Free Time Between Stop/Start
Condition
Minimum Hold Time After (Repeated) Start
Condition
Minimum Repeated Start Condition Set-Up
Time
Minimum Stop Condition Set-Up Time
Minimum Data Hold Time Input
Minimum Data Hold Time Output
Minimum Data Set-Up Time Input
Maximum Suppressed Spike Pulse
Width
SCL, SDA Input Capacitance
50
300
400
1.3
600
1.3
600
600
600
0
900
100
250
10
Note 3:
Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
The deviation is measured from the center of the quantization band.
kHz
µs
ns
µs
ns
ns
ns
ns
ns
ns
ns
pF
PARAMETER
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
CC
= 3.3V, unless otherwise noted.
CONDITIONS
MIN
TYP
MAX
UNITS
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
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