LTC2995

13

2995f

DS

1.2V

200k

400k

1.8V

VT2

VT1

PS

TO2

TO1

3.3V

LTC2995

2995 F06

OT ALARM

OT WARNING

GND

–

+

TO1/TO2

PULSE

GENERATOR

UVLO

400k

400k

T/V

Figure 5. Temperature Thresholds

Figure 6. Monitoring Internal Temperature with Two Overtemperature Thresholds

APPLICATIONS INFORMATION

Temperature Thresholds

The threshold voltages at VT1 and VT2 can be set with

as shown in Figure 5.

The following design procedure can be used to size the

resistive divider.

1. Calculate Threshold Voltages:

VT1

= T1• 4

mV

K

•

1.004

VT2

= T2 • 4

mV

K

•

1.004

where

sensor is used and T1 and T2 are the desired threshold

temperatures in degrees Kelvin.

a desired current through the resistive divider

VT1

VT2 – VT1

2995 F05

1.8V

SLOPE =

ACT

η

O

T

200k

VT2

VT1

O.8V

K

mV