LTC2995 Datasheet, PDF (1/20 Pages) Linear Technology – Temperature Sensor and Dual Voltage Monitor

FEATURES
n _{Monitors Temperature and Two Voltages}
n _{Voltage Output Proportional to Temperature}
n _{Adjustable Thresholds for Temperature and Voltage}
n _{±1°C Remote Temperature Accuracy}
n _{±2°C Internal Temperature Accuracy}
n _{±1.5% Voltage Threshold Accuracy}
n _{3.5ms Update Time}
n _{2.25V to 5.5V Supply Voltage}
n _{Input Glitch Rejection}
n _{Adjustable Reset Timeout}
n _{220μA Quiescent Current}
n _{Open Drain Alert Outputs}
n _{Available in 3mm × 3mm QFN Package}
APPLICATIONS
n _{Network Servers}
n _{Core, I/O Voltage Monitors}
n _{Desktop and Notebook Computers}
n _{Environmental Monitoring}
LTC2995
Temperature Sensor and
Dual Voltage Monitor with
Alert Outputs
DESCRIPTION
The LTC^®2995 is a high accuracy temperature sensor
and dual supply monitor. It converts the temperature of
an external diode sensor and/or its own die temperature
to an analog output voltage while rejecting errors due to
noise and series resistance. Two supply voltages and the
measured temperature are compared against upper and
lower limits set with resistive dividers. If a threshold is
exceeded, the device communicates an alert by pulling
low the correspondent open drain logic output.
The LTC2995 gives ±1°C accurate temperature results
using commonly available NPN or PNP transistors or
temperature diodes built into modern digital devices. Volt-
ages are monitored with 1.5% accuracy. A 1.8V reference
output simplifies threshold programming and can be used
as an ADC reference input.
The LTC2995 provides an accurate, low power solution for
temperature and voltage monitoring in a compact 3mm ×
3mm QFN 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
Dual OV/UV Supply and Single OT/UT Remote Temperature Monitor
2.5V
1.2V
0.1μF
194k
10.2k
45.3k 64.4k
10.2k
45.3k
V_CC
PS
DS
VH1
LTC2995
D⁺
470pF
D^–
VL1
4mV/K
V_PTAT
VH2
TO2 ^{OT T > 125°C}
TO1 ^{UT T < 75°C}
VL2
OV ^+10%
UV ^–10%
V_REF VT2 VT1 GND TMR
20k 20k 140k
5nF
ASIC
TEMPERATURE
SENSOR
SYSTEM
MONITOR
2995 TA01a
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)
2995 TA01b
2995f
1