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TMP300AIDBVR Datasheet(PDF) 6 Page - Texas Instruments

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Part # TMP300AIDBVR
Description  1.8V, Resistor-Programmable TEMPERATURE SWITCH and ANALOG OUT TEMPERATURE SENSOR in SC70
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMP300AIDBVR Datasheet(HTML) 6 Page - Texas Instruments

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APPLICATIONS INFORMATION
R
=
SET
(T
0.01+0.5)
´
SET
3e
-
6
(1)
CALCULATING RSET
R
ink
=
W
SET
10(50+T
)
SET
3
(2)
USING VTEMP TO TRIP THE DIGITAL OUTPUT
R
INT
210kW
R
SET
T
SET
OUT
V+
HYST
SET
V
TEMP
TMP300
3 A
m
Proportional
toT
A
Open-DrainControl
Voltagesource
totesttrippoint.
TMP300
SBOS335A – JUNE 2005 – REVISED SEPTEMBER 2007
To set the TMP300 to trip at a preset value, calculate
The TMP300 is a thermal sensor designed for
the RSET resistor value according to Equation 1 or
over-temperature
protection
circuits
in
electronic
Equation 2:
systems. The TMP300 uses a set resistor to program
the trip temperature of the digital output. An additional
high-impedance
(210k
Ω)
analog
voltage
output
provides the temperature reading.
Where TSET is in °C; or
The set resistor (RSET) provides a threshold voltage
for the comparator input. The TMP300 trips when the
Where TSET is in °C.
VTEMP pin exceeds the TSET voltage. The value of the
set resistor is determined by the analog output
function and the 3
μA internal bias current.
The analog voltage output can also serve as a
voltage input that forces a trip of the digital output to
simulate a thermal event. This simulation facilitates
easy system design and test of thermal safety
circuits, as shown in Figure 8.
Figure 8. Applying Voltage to Trip Digital Output
6
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Copyright © 2005–2007, Texas Instruments Incorporated
Product Folder Link(s): TMP300


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