TMP392

VDD

SETA

SETB

OUTA

OUTB

GND

215 kŸ

10 kŸ

0.1 µF

3.3 V

17

TMP392

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SNIS216 – NOVEMBER 2019

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8.2.4 One Channel Operation for Warm Trip Point from 30°C up to 105°C

Figure 15 shows the TMP392 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 2.

Figure 15. TMP392 One Channel (Warm) Operation Example Circuit With 55°C Trip Point and 10°C

Hysteresis

9 Power Supply Recommendations

The low supply current and wide supply range of the TMP392 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.

10 Layout

10.1 Layout Guidelines

The TMP392 is extremely simple to layout. Place the power supply bypass capacitor as close to the device as

possible, and connect the capacitor as shown in Figure 16. Place the RSETA and RSETB resistors as close to the

device as possible. Carefully consider the resistor placement to avoid additional leakage or parasitic capacitance,

as this may affect the actual resistor sense value for the trip thresholds and hysteresis. If there is a possibility of

moisture condensation on the SETA and SETB circuits, which may lead to additional leakage current, consider

adding a conformal coating to the circuits.