FEATURES
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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.
Monitors Temperature and Two Voltages
Voltage Output Proportional to Temperature
Adjustable Thresholds for Temperature and Voltage
±1°C Remote Temperature Accuracy
±2°C Internal Temperature Accuracy
±1.5% Voltage Threshold Accuracy
3.5ms Update Time
2.25V to 5.5V Supply Voltage
Input Glitch Rejection
Adjustable Reset Timeout
220μA Quiescent Current
Open Drain Alert Outputs
Available in 3mm × 3mm QFN Package
APPLICATIONS
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Network Servers
Core, I/O Voltage Monitors
Desktop and Notebook Computers
Environmental Monitoring
TYPICAL APPLICATION
Dual OV/UV Supply and Single OT/UT Remote Temperature Monitor
2.5V
1.2V
V
CC
0.1μF
194k
10.2k
VL1
45.3k
64.4k
VH2
10.2k
VL2
45.3k
V
REF
20k
VT2
20k
VT1
V
PTAT
TO2
TO1
OV
UV
GND TMR
5nF
4mV/K
OT
T > 125°C
UT
T < 75°C
+10%
–10%
SYSTEM
MONITOR
0.8
25 50 75 100 125 150
–50 –25 0
REMOTE DIODE TEMPERATURE (°C)
2995 TA01b
V
PTAT
vs Remote
Diode Temperature
1.8
ASIC
1.6
D
+
TEMPERATURE
SENSOR
V
PTAT
(V)
470pF
D
LTC2995
–
PS
DS
VH1
1.4
1.2
1.0
140k
2995 TA01a
2995f
1
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
