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LM27 Folha de dados(PDF) 6 Page - Texas Instruments

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Nome de Peças LM27
Descrição Electrónicos  LM27 SOT-23, 짹3째C Accurate, 120째C-150째C Factory Preset Thermostat
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

LM27 Folha de dados(HTML) 6 Page - Texas Instruments

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1.8386 - VTEMP
3.552 x 10
-6
T = -1475.49 + 2.2668 x 10
6 +
LM27__L
V+
VTEMP
GND
HYST
OS
HYST
REF
TEMP
SENSOR
+
-
V+
LM27__N
V+
VTEMP
GND
HYST
US
HYST
REF
TEMP
SENSOR
-
+
V+
LM27__J
V+
VTEMP
GND
HYST
OS
HYST
REF
TEMP
SENSOR
+
-
LM27__K
V+
VTEMP
GND
HYST
US
HYST
REF
TEMP
SENSOR
+
-
LM27
SNIS124D – AUGUST 2002 – REVISED JULY 2013
www.ti.com
FUNCTIONAL DESCRIPTION
LM27 OPTIONS — Output Pin Options Block Diagrams
Figure 1. LM27-_ _J
Figure 2. LM27-_ _K
Figure 3. LM27-_ _L
Figure 4. LM27-_ _N
The LM27 can be factory programmed to have a trip point anywhere in-between 120°C to 150°C.
Applications Hints
AFTER-ASSEMBLY PCB TESTING
The LM27's VTEMP output allows after-assembly PCB testing by following a simple test procedure. Simply
measuring the VTEMP output voltage will verify that the LM27 has been assembled properly and that its
temperature sensing circuitry is functional. The VTEMP output has very weak drive capability that can be
overdriven by 1.5mA. Therefore, one can simply force the VTEMP voltage to cause the digital output to change
state, thereby verifying that the comparator and output circuitry function after assembly. Here is a sample test
procedure that can be used to test the LM27CIM5X-2HJ which has a 140°C trip point.
1. Turn on V+ and measure VTEMP. Then calculate the temperature reading of the LM27 using the equation:
VO = (−3.552×10
−6×(T−30)2) + (−10.69576×10−3×(T−30)) + 1.8386V
(2)
or
(3)
2. Verify that the temperature measured in step one is within (±3°C + error of reference temperature sensor) of
the ambient/board temperature. The ambient/board temperature (reference temperature) should be
measured using an extremely accurate calibrated temperature sensor, which is in close proximity to and
mounted on the same PCB as the LM27 perhaps even touching the GND lead of the LM27 if possible. The
LM27 will sence the board temperature not the ambient temperature (see MOUNTING CONSIDERATIONS)
3.
(a) Observe that OS is high.
(b) Drive VTEMP to ground.
(c) Observe that OS is now low.
(d) Release the VTEMP pin.
(e) Observe that OS is now high.
4.
(a) Observe that OS is high.
(b) Drive VTEMP voltage down gradually.
(c) When OS goes low, note the VTEMP voltage.
(d) VTEMPTrig = VTEMP at OS trigger (HIGH->LOW)
(e) Calculate Ttrig using Equation 3.
6
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Copyright © 2002–2013, Texas Instruments Incorporated
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