LTC2996 Datasheet, PDF (1/16 Pages) Linear Technology – Temperature Sensor with Alert Outputs Voltage Output Proportional to Temperature

LTC2996
Temperature Sensor with
Alert Outputs
Features
n _{Converts Remote or Internal Diode Temperature to}
Analog Voltage
n _{Adjustable Overtemperature and Undertemperature}
Thresholds
n _{Voltage Output Proportional to Temperature}
n _{±1°C Remote Temperature Accuracy}
n _{±2°C Internal Temperature Accuracy}
n _{Built-In Series Resistance Cancellation}
n _{Open Drain Alert Outputs}
n _{2.25V to 5.5V Supply Voltage}
n _{1.8V Reference Voltage Output}
n _{200μA Quiescent Current}
n _{10-Lead 3mm × 3mm DFN Package}
Applications
n _{Temperature Monitoring and Measurement}
n _{System Thermal Control}
n _{Network Servers}
n _{Desktop and Notebook Computers}
n _{Environmental Monitoring}
Description
The LTC^®2996 is a high accuracy temperature sensor
with adjustable overtemperature and undertemperature
thresholds and open drain alert outputs. It converts the
temperature of an external diode sensor or its own die
temperature to an analog output voltage while rejecting
errors due to noise and series resistance. The measured
temperature is compared against upper and lower limits
set with resistive dividers. If a threshold is exceeded, the
device communicates an alert by pulling low the corre-
spondent open drain logic output.
The LTC2996 gives ±1°C accurate temperature results
using commonly available NPN or PNP transistors or
temperature diodes built into modern digital devices. A
1.8V reference output simplifies threshold programming
and can be used as an ADC reference input.
The LTC2996 provides an accurate, low power solution
for temperature monitoring in a compact 3mm × 3mm
DFN package.
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
2.25V TO 5.5V
Remote Temperature Monitor with Overtemperature
and Undertemperature Thresholds
0.1µF
1.8V
43k
36k
102k
V_REF
V_CC
OT ^{OT T > 70°C}
LTC2996
VTH
UT ^{UT T < –20°C}
TEMPERATURE
CONTROL
SYSTEM
VTL
V_PTAT
D⁺
GND
D^–
2996 TA01a
4mV/K
470pF
MMBT3904
V_PTAT vs Remote
Diode Temperature
1.8
1.6
1.4
1.2
1.0
0.8
–50 –25 0 25 50 75 100 125 150
REMOTE DIODE TEMPERATURE (°C)
2996 TA01b
2996f
1