Texas Instruments TMP392EVM User manual

TMP392EVM

User's Guide

Literature Number: SNIU040

November 2019

2SNIU040–November 2019

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Table of Contents

Contents

1 Trademarks......................................................................................................................... 4

2 Overview............................................................................................................................. 4

2.1 TMP392EVM Kit Contents.............................................................................................. 5

3 EVM Hardware Overview and Operation.................................................................................. 5

3.1 Power Input and Regulation ............................................................................................ 5

3.2 Perforated Breakout Board ............................................................................................. 5

3.3 Dual-Channel Resistor Programmable Trip Points .................................................................. 6

3.4 Manual Trip Test and Reset ............................................................................................ 6

3.5 Open-Drain Output....................................................................................................... 6

4 Board Layout....................................................................................................................... 7

5 Schematic and Bill of Materials.............................................................................................. 7

SNIU040–November 2019

TMP392EVM User's Guide

User's Guide

SNIU040–November 2019

TMP392EVM User's Guide

The TMP392 is an ultra-low power, dual-trip, dual-output, resistor-programmable temperature switch. This

device enables thermal protection and thermal event monitoring over a wide temperature range. The

TMP392 offers independent dual overtemperature (hot and warm) detection in the temperature range from

+30°C to +124°C with ±3.0°C trip accuracy. The Texas Instruments TMP392EVM (Evaluation Module) is

easy to use and can evaluate the performance of the TMP392 right out of the box. The EVM has pre-

populated resistors corresponding to a hot and warm trip point with 5°C hysteresis, and LED indicators at

the outputs of the device. The trip test function is available through the use of onboard push buttons to

test the output of both channels. The sensor is also located on a perforated portion of the PCB that can be

separated from the main board for prototyping. The TMP392EVM does not require any calibration or

software programming, as the trip points are programmed through two resistors. This document provides

detailed information about the device operation and evaluation board features.

Figure 1. TMP392 Evaluation Board

USB Power (J2) Breakout

TMP392 (U2)

Jumper (J1)

Overview

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TMP392EVM User's Guide

1 Trademarks

All trademarks are the property of their respective owners.

2 Overview

The TMP392EVM allows users to evaluate the performance of the TMP392 dual-trip programmable

temperature switch. The EVM comes in a USB stick form factor that can plug into a USB port to supply

power and begin the evaluation of the temperature switch. The hardware is as shown in Figure 1. The

module is designed so all of the features, including the manual trip test and reset of both channels, are

readily available for testing. Two LED indicators are illuminated when either output of the TMP392 is

triggered based on the temperature trip point. The EVM also features a perforated breakout portion of the

board which can be wired to test the TMP392 in either an existing system or oven.

Figure 2. TMP392 Evaluation Board Top Side

Figure 3. TMP392 Evaluation Board Bottom Side

TMP392

VDD

SETA

SETB

OUTA

OUTB

GND

VCC

RSETA

RSETB

Rpullup

0.1 µF

Power Input

USB LDO

Dual Buffer

Driver

Trip/Hysteresis

Settings LED

OUTA

LED

OUTB

Rpullup

VCC

Trip Test

Switches

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Overview

SNIU040–November 2019

TMP392EVM User's Guide

2.1 TMP392EVM Kit Contents

Table 1 summarizes the contents of the TMP392EVM kit. Figure 1 shows all of the included hardware.

Table 1. TMP392EVM Kit Contents

Item Quantity

PCB Test Board: TMP392EVM 1

USB Cable Extender 1

3 EVM Hardware Overview and Operation

The TMP392EVM block diagram is shown in Figure 4, and each block is described in detail in the

following sections.

Figure 4. TMP392 Evaluation Board Block Diagram

3.1 Power Input and Regulation

Power is supplied from the USB connector, J2, with +5 V. This input can connect to the USB port of a

laptop or desktop. The evaluation board does not require an external power supply, but one may be used

if desired (such as when the breakout board is disconnected), so long as the voltage is within the

maximum rated voltage of the TMP392.

USB power is used when J1 is shorted at pins 1-2 using a jumper. This connects +5 V to the LDO (low

dropout regulator), providing a regulated output voltage of +3.3 V. If an external supply is required, then

jumper J1 can be removed and power may be connected to pin 2 of J1. If an external supply is used, the

input voltage can be from +2.2 V to +5.5 V. The input voltage can be measured at test pin TP1 (VDD).

The LED, D2, will illuminate when power is good.

3.2 Perforated Breakout Board

The EVM board is perforated along the unpopulated J3 designator to break away the sensor portion of the

board from the power and LED output for additional prototyping and testing. J3 provides connections for

the breakout board for power, inputs, and outputs. The pins located on both sides of the J3 designator are

labeled with silkscreen on the EVM, including SETA, SETB, OUTA, OUTB, VDD, and GND. All

components on the breakout board are rated up to +150°C. The EVM was not designed with high-

temperature PCB material, and thus was not designed for prolonged testing at high temperature.

+60°C+55°C

OUTA

VCC

TTRIP +30°C+25°C

OUTB

VCC

TTRIP

EVM Hardware Overview and Operation

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TMP392EVM User's Guide

3.3 Dual-Channel Resistor Programmable Trip Points

The application can use standard 1.05-kΩto 909-kΩE96-series resistors to set the hot trip point (Channel

A) and standard 10.5-kΩto 909-kΩE96-series resistors warm temperature trip points (Channel B). There

are 48 available trip points in the hot trip point range and 32 available trip points corresponding to a warm

trip point and hysteresis setting. The hot trip point may be in the +30°C to +124°C range, while the warm

trip point is in the +30°C to +105°C range. These settings can be found in the TMP392 device data sheet.

On the TMP392EVM, resistors R3 and R5 are populated to set the trip points for SETA and SETB,

respectively. These are located on the same breakout board where the TMP392 is located, and are

designated as RSETA and RSETB. The resistor in the SETA programs the hot trip point, while the resistor

in the SETB programs the warm trip point and the hysteresis settings for both channels. R3 is populated

on the EVM with a 9.09-kΩresistor, corresponding to the hot trip point at +60°C. R5 is 90.9 kΩ,

corresponding to the warm trip point at +30°C and hysteresis of 5°C. With the trip point at +30°C, the user

can immediately visualize the tripped output after opening the EVM.

Two additional footprints for 0603 resistors, R4 and R6, are available to solder different resistors and

program alternate hot and warm trip points. Remember that R3 and R4 should not be populated at the

same time, and that R5 and R6 should also not be populated at the same time. Standard resistor values in

the E96-series that have 1% tolerance should be used for best performance.

Figure 5 shows the behavior of the output using hysteresis. When the hot trip point of +60°C is reached,

OUTA is tripped and the output will remain low until the temperature drops below the hysteresis level

subtracted from the hot threshold temperature. In this case, the hysteresis is set at 5°C, so OUTA returns

high when the temperature drops to +55°C. The same goes for the lower threshold, which is set at +30°C.

When the sensor goes to +30°C, OUTB goes low and will return high when the temperature drops to

+25°C.

Figure 5. Hysteresis Behavior Example

3.4 Manual Trip Test and Reset

Both outputs can be tripped manually by applying a logic high to the SETA and SETB inputs to evaluate

the functionality of the outputs. On the evaluation board, there are two designated push buttons—S1 and

S2—to trip OUTA and OUTB, respectively. The output LEDs for OUTA and OUTB, D3 (red) and D4

(green), will illuminate when the trip point is reached or if the output is forced by the trip test.

3.5 Open-Drain Output

Pullup resistors are located at the open-drain OUTA and OUTB outputs. TI recommends to tie the pullup

voltage to the VDD of the TMP392. If this is not possible, however, an external voltage may be used for

VDDIO that must be less than or equal to VDD + 0.3 V of the TMP392. To connect an external VDDIO,

the 0-Ωresistor at R7 may be desoldered to remove connection to VDD, then resoldered at R9 to connect

an external supply at TP5 as shown in Figure 6.

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Board Layout

SNIU040–November 2019

TMP392EVM User's Guide

4 Board Layout

The PCB is a four-layer board that includes a power regulator, the TMP392 sensor, all of the necessary

auxiliary circuitry, and various test points. The portion of the board where the sensor and resistors is

located may be broken off for evaluation separately from the rest of the EVM. This breakout board was

minimized in size to reduce the thermal mass for improving the thermal response of the TMP392.

Further layout considerations in the final design using the TMP392 may be required based on the

application. Refer to Temperature Sensors: PCB Guidelines for Surface Mount Devices for design and

layout recommendations for temperature sensors. The breakout board includes resistors rated up to

150°C for high-temperature testing, as well as the decoupling capacitor C7, which is placed as close as

possible to the TMP392.

NOTE: This PCB will not withstand temperatures of 150°C for extended periods of time because it

was not manufactured with high-temperature material.

5 Schematic and Bill of Materials

Figure 6. TMP392 Evaluation Board Schematic

Schematic and Bill of Materials

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TMP392EVM User's Guide

Table 2. TMP392 Test Board Bill of Materials

ITEM NO. QTY VALUE REF DES DESCRIPTION VENDOR/MFR PART NUMBER

1 1 10 µF C1 CAP, CERM, 10 µF,

10 V, ±20%, X5R,

0603 TDK C1608X5R1A106M

080AC

2 1 2.2 µF C2 CAP, CERM, 2.2 µF,

16 V, ±10%, X5R,

0402 MuRata GRM155R61C225

KE11D

4 2 0.1 µF C7, C8 CAP, CERM, 0.1 µF,

25 V, ±10%, X8R,

AEC-Q200 Grade 0,

0603 TDK CGA3E2X8R1E10

4K080AA

5 1 6.2 V D1 Diode, Zener, 6.2 V,

300 mW, SOD-523 Diodes Inc. BZT52C6V2T-7

6 2 Green D2, D4 LED, Green, SMD Lumex SML-LX0603GW-

7 1 Red D3 LED, Red, SMD Lite-On LTST-C191KRKT

8 1 J1 Header, 2.54 mm,

2x1, Gold, TH Wurth Elektronik 61300211121

9 1 J2 Connector, Plug,

USB Type A, R/A,

Top Mount SMT Molex 48037-2200

10 1 120 L1 Ferrite Bead, 120 Ω

at 100 MHz, 0.55 A,

0402 MuRata BLM15AG121SN1

11 1 47 R1 RES, 47, 5%, 0.1 W,

AEC-Q200 Grade 0,

0402 Panasonic ERJ-2GEJ470X

12 3 1k R2, R11, R12 RES, 1.0 kΩ, 5%,

0.1 W, AEC-Q200

Grade 0, 0402 Panasonic ERJ-2GEJ102X

13 1 9.09k R3 RES, 9.09 k, 1%,

0.1 W, 0603 Vishay-Dale CRCW06039K09F

KEA

14 1 90.9k R5 'RES, 90.9 k, 1%,

0.1 W, 0603 Vishay-Dale CRCW060310K5F

KEA

15 1 0 R7 RES, 0, 5%, 0.063

W, AEC-Q200

Grade 0, 0402 Vishay-Dale CRCW060390K9F

KEA

16 2 10k R8, R10 RES, 10 kΩ, 5%, 0.1

W, AEC-Q200

Grade 0, 0402 Panasonic ERJ-2GEJ103X

17 2 S1, S2 Switch, SPST-NO,

Off-Mom, 0.05A,

12VDC, SMD C&K Components PTS820 J20M

SMTR LFS

18 1 SH-J1 Shunt, 100mil, Tin

plated, Black Samtec SNT-100-BK-T-H

19 5 TP1, TP2, TP3,

TP4, TP5 Natural PC Test

Point Brass, SMT Harwin S2761-46R

20 1 U1 Single Output LDO,

200 mA, Fixed 3.3 V

Output, 2 to 5.5 V

Input, with Low IQ Texas Instruments TLV70033DCKR

21 1 U2 Dual-Trip, Resistor-

Programmable

Temperature Switch Texas Instruments TMP392A2DRLR

22 1 U3 Dual Buffer/Driver

With 3-State

Outputs Texas Instruments SN74LVC2G240D

CUR

23 0 J3 Header, 100 mil,

6x2, Gold, TH Samtec TSW-106-07-G-D

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Schematic and Bill of Materials

SNIU040–November 2019

TMP392EVM User's Guide

Table 2. TMP392 Test Board Bill of Materials (continued)

ITEM NO. QTY VALUE REF DES DESCRIPTION VENDOR/MFR PART NUMBER

24 0 9.09k R3 RES, 9.09 k, 1%,

0.1 W, 0603 Vishay-Dale CRCW06039K09F

KEA

25 0 90.9k R5 'RES, 90.9 k, 1%,

0.1 W, 0603 Vishay-Dale CRCW060310K5F

KEA

26 0 0 R9 RES, 0, 5%, 0.063

W, AEC-Q200

Grade 0, 0402 Vishay-Dale CRCW04020000Z0

STANDARD TERMS FOR EVALUATION MODULES

1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or

documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance

with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.

1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility

evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not

finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For

clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions

set forth herein but rather shall be subject to the applicable terms that accompany such Software

1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,

or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production

system.

2Limited Warranty and Related Remedies/Disclaimers:

2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License

Agreement.

2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM

to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by

neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have

been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications

or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control

techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM.

User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10)

business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.

2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit

User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty

period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or

replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be

warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day

warranty period.

WARNING

Evaluation Kits are intended solely for use by technically qualified,

professional electronics experts who are familiar with the dangers

and application risks associated with handling electrical mechanical

components, systems, and subsystems.

User shall operate the Evaluation Kit within TI’s recommended

guidelines and any applicable legal or environmental requirements

as well as reasonable and customary safeguards. Failure to set up

and/or operate the Evaluation Kit within TI’s recommended

guidelines may result in personal injury or death or property

damage. Proper set up entails following TI’s instructions for

electrical ratings of interface circuits such as input, output and

electrical loads.

NOTE:

EXPOSURE TO ELECTROSTATIC DISCHARGE (ESD) MAY CAUSE DEGREDATION OR FAILURE OF THE EVALUATION

KIT; TI RECOMMENDS STORAGE OF THE EVALUATION KIT IN A PROTECTIVE ESD BAG.

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