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TMP708AIDBVR Folha de dados(PDF) 6 Page - Texas Instruments

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Nome de Peças TMP708AIDBVR
Descrição Electrónicos  Resistor-Programmable Temperature Switch in SOT Package
Download  14 Pages
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

TMP708AIDBVR Folha de dados(HTML) 6 Page - Texas Instruments

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Hysteresis
Control
Positive
Tempco
Reference
HYST
SET
Negative
Tempco
Reference
TMP708
R
SET
R
PULLUP
+2.7 V to +5.5 V
OT
VCC
GND
TMP708
SBOS585A
– DECEMBER 2011 – REVISED FEBRUARY 2012
www.ti.com
THEORY OF OPERATION
DEVICE DESCRIPTION
The
TMP708
is
a
fully-integrated,
resistor-programmable
temperature
switch
that
incorporates
two
temperature-dependent voltage references and one comparator. One voltage reference exhibits a positive
temperature coefficient (tempco), and the other voltage reference exhibits a negative tempco. The temperature at
which both voltage references are equal determines the temperature trip point.
The TMP708 temperature threshold is programmable from 0
°C to +125°C and is set by an external 1% resistor
from the SET pin to the GND pin. The TMP708 has an open-drain, active-low output structure that can easily
interface with a microprocessor.
HYSTERESIS INPUT
The HYST pin is a digital input that allows the input hysteresis to be set at either 10
°C (when HYST = VCC) or
30
°C (when HYST = GND). The hysteresis function keeps the OT pin from oscillating when the temperature is
near the threshold. Thus, the HYST pin should always be connected to either VCC or GND. Other input voltages
on this pin may cause abnormal supply currents and/or function.
CIRCUIT DETAILS
Figure 5 shows the comparator, the NFET open-drain device connected to the OT pin, the positive tempco
reference using the external RSET resistor, the negative tempco reference, and the hysteresis control. The
voltage of the positive tempco reference is controlled by external resistor RSET.
Figure 5. Circuit Details
The TMP708 reaches the temperature trip point when the voltage from the positive tempco reference is greater
than the voltage from the negative tempco reference. This situation causes the output of the comparator to
switch from logic 0 to logic 1. The comparator output drives the gate of the NFET open-drain device and pulls the
voltage on the OT pin from logic 1 to logic 0 under these conditions (output trips). Furthermore, the logic 1 output
from the comparator causes the hysteresis control to increase the voltage of the positive tempco reference by an
amount set by the logic setting on the HYST pin (10
°C for logic 1 on the HYST pin; 30°C for logic 0 on the HYST
pin). Increasing the voltage of the positive tempco reference after the TMP708 trips stops the TMP708 from
untripping (voltage on the OT pin changing from logic 0 to logic 1) until the local temperature has been reduced
by the amount set by the HYST pin. After the local temperature has been reduced and the voltage from the
positive tempco reference is less than the voltage from the negative tempco reference, the output of the
comparator switches from logic 1 to logic 0. This condition causes the voltage on the OT pin to change from logic
0 to logic 1 (device untrips).
6
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Copyright
© 2011–2012, Texas Instruments Incorporated
Product Folder Link(s): TMP708


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