TMP302B datasheet(8/18 Pages) TI1

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OUT

50°C

60°C

(TRIP)

TMP302-Q1

SLOS889B – OCTOBER 2014 – REVISED JULY 2015

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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

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).

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TMP302B Datasheet(PDF) 8 Page - Texas Instruments