8.2.4 One Channel Operation for Cold Trip Point

Figure 8-7 shows the TMP390 configured for one channel operation, with a single resistor to set the warm trip

point and hysteresis. The resistor values for one channel warm trip point is same as described in Table 7-2.

TMP390

VDD

SETA

SETB

OUTA

OUTB

GND

249 NŸ

10 NŸ

0.1 µF

3.3 V

Figure 8-7. TMP390 One Channel (Cold) Operation Example Circuit With –20°C Trip Point and 10°C

Hysteresis

8.2.4.1 Application Curve

Time (s)

Time (s)

OUTB

Hysteresis

10°C

Cold threshold

(Channel B)

Figure 8-8. TMP390 One Channel (Cold) Operation Thresholds and Hysteresis

9 Power Supply Recommendations

The low supply current and wide supply range of the TMP390 allow the device to be powered from many

sources. VDDIO must always be lower than or equal to VDD + 0.3 V.

Power supply bypassing is strongly recommended by adding a 0.1-µF capacitor from VDD to GND. In noisy

environments, TI recommends to add a filter with 0.1-µF capacitor and 100-Ω resistor between external supply

and VDD to limit the power supply noise.

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TMP390

SBOS904A – MAY 2019 – REVISED AUGUST 2020

Copyright © 2022 Texas Instruments Incorporated

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