OUT

50°C

60°C

T

(TRIP)

V

S

8

TMP302

SBOS488E – JUNE 2009 – REVISED DECEMBER 2018

www.ti.com

Product Folder Links: TMP302

Submit Documentation Feedback

Copyright © 2009–2018, Texas Instruments Incorporated

7.3 Feature Description

7.3.1 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 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: HYSTSET = VS, TRIPSET1 = VS, TRIPSET0 = GND

7.4 Device Functional Modes

The TMP302 family of devices has a single functional mode. Normal operation for the TMP302 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).