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Texas Instruments TMP390EVM User guides
TMP390EVM
User's Guide
Literature Number: SNIU033
May 2019
Contents
1
2
Trademarks ......................................................................................................................... 4
Overview ............................................................................................................................. 4
2.1
3
TMP390EVM Kit Contents .............................................................................................. 4
EVM Hardware Overview and Operation.................................................................................. 5
3.1
Power Input and Regulation ............................................................................................ 5
4
5
............................................................................................. 5
3.3
Dual-Channel Resistor Programmable Trip Points .................................................................. 5
3.4
Manual Trip Test and Reset ............................................................................................ 6
3.5
Open-Drain Output ....................................................................................................... 6
Board Layout ....................................................................................................................... 6
Schematic and Bill of Materials .............................................................................................. 7
2
Table of Contents
3.2
Perforated Breakout Board
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User's Guide
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TMP390EVM User's Guide
The TMP390 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
TMP390 offers independent overtemperature (hot) and undertemperature (cold) detection in the
temperature range from –55°C to +130°C with ±2.5°C trip accuracy. The Texas Instruments TMP390EVM
(Evaluation Module) is easy to use and can evaluate the performance of the TMP390 right out of the box.
The EVM has pre-populated resistors corresponding to a hot and cold 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 TMP390EVM 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. TMP390 Evaluation Board
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3
Overview
1
www.ti.com
Trademarks
All trademarks are the property of their respective owners.
2
Overview
The TMP390EVM allows users to evaluate the performance of the TMP390 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 TMP390 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 TMP390 in either an existing system or an oven.
USB Power (J2)
Figure 2. TMP390 Evaluation Board Top Side
Figure 3. TMP390 Evaluation Board Bottom Side
2.1
TMP390EVM Kit Contents
Table 1 summarizes the contents of the TMP390EVM kit. Figure 1 shows all of the included hardware.
Table 1. TMP390EVM Kit Contents
4
Item
Quantity
PCB Test Board: TMP390EVM
1
USB Cable Extender
1
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EVM Hardware Overview and Operation
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3
EVM Hardware Overview and Operation
The TMP390EVM block diagram is shown in Figure 4, and each block is described in detail in the
following sections.
Figure 4. TMP390 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 TMP390.
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 hightemperature PCB material, and thus was not designed for prolonged testing at high temperature.
3.3
Dual-Channel Resistor Programmable Trip Points
The engineer can use two 1.05-kΩ to 909-kΩ E96-series resistors to set the high and low temperature trip
points. There are 48 available trip points in the hot trip point range and 48 available trip points
corresponding to a cold trip point and hysteresis setting. The hot trip point may be in the +30°C to +124°C
range, while the cold trip point is in the –50°C to +25°C range. These settings can be found in the
TMP390 device data sheet. On the TMP390EVM, 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 TMP390 is
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5
EVM Hardware Overview and Operation
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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 cold trip point and the hysteresis settings for both channels.
R3 is populated on the EVM with a 5.90-kΩ resistor, corresponding to the hot trip point at 54°C. R5 is 10.5
kΩ, corresponding to the cold trip point at 25°C and hysteresis of 5°C. With the trip point at 25°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 cold 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 high trip point of +54°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 +49°C. The same goes for the lower threshold, which is set at +25°C.
When the sensor goes to +25°C, OUTB goes low and will return high when the temperature rises above
30°C.
OUTA
OUTB
VCC
VCC
+49°C
+54°C
TTRIP
TTRIP
25°C
30°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 TMP390. If this is not possible, however, an external voltage may be used for
VDDIO that must be less than or equal to VDD of the TMP390. To connect an external VDDIO, the 0-Ω
resistor 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.
4
Board Layout
The PCB is a four-layer board which includes a power regulator, the TMP390 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 TMP390. Further
layout considerations in the final design using the TMP390 can be taken into account depending on the
6
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Schematic and Bill of Materials
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application. Refer to Temperature Sensors: PCB Guidelines for Surface Mount Devices (SNOA967) 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 closely
to the TMP390. Note that 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. TMP390 Evaluation Board Schematic
Table 2. TMP390 Test Board Bill of Materials
Item No.
Qty
Value
Ref Des
Description
Vendor/Mfr
1
1
10 µF
C1
CAP, CERM, 10 µF,
10 V, ±20%, X5R,
0603
2
1
2.2 µF
C2
CAP, CERM, 2.2 µF,
16 V, ±10%, X5R,
MuRata
0402
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TDK
Part Number
C1608X5R1A106M
080AC
GRM155R61C225
KE11D
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7
Schematic and Bill of Materials
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Table 2. TMP390 Test Board Bill of Materials (continued)
Item No.
8
Qty
Value
Ref Des
Description
Vendor/Mfr
Part Number
CAP, CERM, 0.1 µF,
25 V, ±10%, X8R,
TDK
AEC-Q200 Grade 0,
0603
CGA3E2X8R1E10
4K080AA
Diode, Zener, 6.2 V,
300 mW, SOD-523
Diodes Inc.
BZT52C6V2T-7
LED, Green, SMD
Lumex
SML-LX0603GWTR
4
2
0.1 µF
C7, C8
5
1
6.2 V
D1
6
2
Green
D2, D4
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
D
11
1
47
R1
RES, 47, 5%, 0.1 W,
AEC-Q200 Grade 0, Panasonic
0402
ERJ-2GEJ470X
12
3
1k
R2, R11, R12
RES, 1.0 kΩ, 5%,
0.1 W, AEC-Q200
Grade 0, 0402
ERJ-2GEJ102X
13
1
5.90k
R3
RES, 1 KΩ, 1%, 0.1
Panasonic
W, AEC-Q200, 0603
ERJ-3EKF1001V
14
1
10.5k
R5
RES, 10.5 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
CRCW04020000Z0
ED
16
2
10k
R8, R10
17
2
18
Panasonic
RES, 10 kΩ, 5%, 0.1
W, AEC-Q200
Panasonic
Grade 0, 0402
ERJ-2GEJ103X
S1, S2
Switch, SPST-NO,
Off-Mom, 0.05A,
12VDC, SMD
C&K Components
PTS820 J20M
SMTR LFS
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
Texas Instruments
Output, 2 to 5.5 V
Input, with Low IQ
TLV70033DCKR
21
1
U2
Dual-Trip, ResistorProgrammable
Temperature Switch
Texas Instruments
TMP390A2DRLR
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
24
0
5.90k
R4
RES, 1 KΩ, 1%, 0.1
Panasonic
W, AEC-Q200, 0603
ERJ-3EKF1001V
25
0
10.5k
R6
RES, 10.5 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
ED
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