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LM57-Q1 Datasheet(PDF) 28 Page - Texas Instruments

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Part # LM57-Q1
Description  Resistor-Programmable Temperature Switch and Analog Temperature Sensor
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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LM57-Q1 Datasheet(HTML) 28 Page - Texas Instruments

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VDD Supply
(+2.4V to +5.5V)
GND
VDD
TOVER
VTEMP
TRIP TEST
Microcontroller
LM57
TOVER
Digital In
SENSE1
SENSE2
LM57-Q1
SNIS191A – JULY 2015 – REVISED JULY 2015
www.ti.com
Typical Application (continued)
8.2.4 Grounding of the TRIP TEST Pin
The circuit in Figure 24 shows the TRIP TEST pin grounded. This allows the LM57-Q1 to function autonomously
without microcontroller intervention. In all other respects this circuit functions similarly to the circuit shown in
Figure 21.
Figure 24. Typical Application Schematic without Microcontroller TRIP TEST Control
9 Power Supply Recommendations
Power supply bypass capacitors are optional and may be required if the supply line is noisy. TI recommends that
a local supply decoupling capacitor be used to reduce noise. For noisy environments, TI recommends a 100-nF
supply decoupling capacitor placed closed across VDD and GND pins of LM57-Q1.
10 Layout
10.1 Layout Guidelines
The LM57-Q1 can be applied easily in the same way as other integrated-circuit temperature sensors. It can be
glued or cemented to a surface. The temperatures of the lands and traces to the other leads of the LM57-Q1 will
also affect the temperature reading.
Alternatively, the LM57-Q1 can be mounted inside a sealed-end metal tube, and can then be dipped into a bath
or screwed into a threaded hole in a tank. As with any IC, the LM57-Q1 and accompanying wiring and circuits
must be kept insulated and dry, to avoid leakage and corrosion. This is especially true if the circuit may operate
at cold temperatures where condensation can occur. If moisture creates a short circuit from the VTEMP output to
ground or VDD, the VTEMP output from the LM57-Q1 will not be correct. Printed-circuit coatings are often used to
ensure that moisture cannot corrode the leads or circuit traces.
28
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