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TMP708AQDBVRQ1 датащи(PDF) 8 Page - Texas Instruments

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номер детали TMP708AQDBVRQ1
подробное описание детали  Automotive, Resistor-Programmable Temperature Switch in SOT Package
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TMP708-Q1
SBOS828 – DECEMBER 2016
www.ti.com
Product Folder Links: TMP708-Q1
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
7.3 Feature Description
7.3.1 Temperature Switch
The TMP708-Q1 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-Q1 has an open-drain, active-low output structure that
easily interfaces with a microprocessor.
The TMP708-Q1 reaches the temperature trip point when the voltage from the positive tempco reference
exceeds the voltage from the negative tempco reference. This difference 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; in other words, the 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). Increase the voltage of the positive tempco reference after the TMP708-
Q1 trips to stop the TMP708-Q1 from untripping (voltage on the OT pin changing from logic 0 to logic 1) until the
local temperature reduces by the amount set by the HYST pin. After the local temperature reduces, 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).
7.3.2 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, always connect the HYST pin to either VCC or GND. Other input voltages on this pin
can cause abnormal supply currents or a device malfunction.
7.3.3 Set-Point Resistor (RSET)
Set the temperature threshold by connecting RSET from the SET pin to GND. The value of RSET is determined
using either Figure 2 or Equation 1:
RSET (kΩ) = 0.0012T
2 – 0.9308T + 96.147
where
T = temperature threshold in degrees Celsius.
(1)
7.4 Device Functional Modes
The TMP708-Q1 device has a single functional mode. Normal operation for the TMP708-Q1 device occurs when
the power-supply voltage applied across the VCC and GND pins is within the specified operating range of 2.7 V
to 5.5 V.


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