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TMP302B Scheda tecnica(PDF) 8 Page - Texas Instruments

Il numero della parte TMP302B
Spiegazioni elettronici  TMP302-Q1, Automotive Grade, Low-Power, Easy-to-Use, Temperature Switch in MicroPackage
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OUT
50°C
60°C
T
(TRIP)
V
S
TMP302-Q1
SLOS889B – OCTOBER 2014 – REVISED JULY 2015
www.ti.com
8.3 Feature Description
8.3.1 HYSTSET
If the temperature trip threshold is crossed, the open-drain, active low output (OUT) goes low and does not return
to the original high state (that is, VS) until the temperature returns to a value within a hysteresis window set by
the HYSTSET pin. The HYSTSET pin allows the user to choose between a 5°C and a 10°C hysteresis window.
Table 2 lists the hysteresis window that corresponds to the HYSTSET setting.
Table 2. HYSTSET Window
HYSTSET
THRESHOLD HYSTERESIS
GND
5°C
VS
10°C
For the specific case of the TMP302A-Q1 device, if the HYSTSET pin is set to 10°C (that is, connected to VS)
and the device is configured with a 60°C trip point (TRIPSET1 = VS, TRIPSET0 = GND), when this threshold is
exceeded the output does not return to the original high state until it reaches 50°C. This case is more clearly
shown in Figure 9.
Figure 9. TMP302A-Q1: HYSTSET = VS, TRIPSET1 = VS, TRIPSET0 = GND
8.4 Device Functional Modes
The TMP302-Q1 family of devices has a single functional mode. Normal operation for the TMP302-Q1 family of
devices occurs when the power-supply voltage applied between the VS pin and GND is within the specified
operating range of 1.4 to 3.6 V. The temperature threshold is selected by connecting the TRIPSET0 and
TRIPSET1 pins to either the GND or VS pins (see Table 1). Hysteresis is selected by connecting the HYSTSET
pin to either the GND or VS pins (see Table 2). The output pin, OUT, remains high when the temperature is
below the selected temperature threshold. The OUT pin remains low when the temperature is at or above the
selected temperature threshold. The OUT pin returns from a low state back to the high state based upon the
amount of selected hysteresis (see the HYSTSET section).
8
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Product Folder Links: TMP302-Q1


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