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LM26CIM5-VPA Fiches technique(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM26CIM5-VPA
Description  Accurate, Factory Preset Thermostat
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM26CIM5-VPA Fiches technique(HTML) 5 Page - National Semiconductor (TI)

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Functional Description
LM26 OPTIONS
The LM26 can be factory programmed to have a trip point
anywhere in the range of −55˚C to +110˚C.
Applications Hints
AFTER-ASSEMBLY PCB TESTING
The LM26’s V
TEMP output allows after-assembly PCB testing
by following a simple test procedure. Simply measuring the
V
TEMP output voltage will verify that the LM26 has been
assembled properly and that its temperature sensing cir-
cuitry is functional. The V
TEMP output has very weak drive
capability that can be overdriven by 1.5mA. Therefore, one
can simply force the V
TEMP 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
LM26CIM5-TPA which has an 85˚C trip point.
1.
Turn on V
+ and measure V
TEMP. Then calculate the
temperature reading of the LM26 using the equation:
V
O = (−3.479x10
−6x(T−30)2) + (−1.082x10−2x(T−30)) +
1.8015V
(1)
or
(2)
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 tem-
perature (reference temperature) should be measured
using an extremely accurate calibrated temperature sen-
sor.
3.
A. Observe that OS is high.
B. Drive V
TEMP to ground.
C. Observe that OS is now low.
D. Release the V
TEMP pin.
E. Observe that OS is now high.
4.
A. Observe that OS is high.
B. Drive V
TEMP voltage down gradually.
C. When OS goes low, note the V
TEMP voltage.
D. V
TEMPTrig=VTEMP at OS trigger (HIGH->LOW)
E. Calculate Ttrig using Equation (2).
5.
A. Gradually raise V
TEMP until OS goes HIGH. Note
V
TEMP.
B. Calculate T
HYST using Equation (2).
V
TEMP LOADING
The V
TEMP output has very weak drive capability (40µA
source, 1µA sink). So care should be taken when attaching
circuitry to this pin. Capacitive loading may cause the V
TEMP
output to oscillate. Simply adding a resistor in series as
shown in Figure 2 will prevent oscillations from occurring. To
determine the value of the resistor follow the guidelines
given in Table 1. The same value resistor will work for either
placement of the resistor. If an additional capacitive load is
placed directly on the LM26 output, rather than across
C
LOAD, it should be at least a factor of 10 smaller than
C
LOAD.
10132312
LM26-_ _A
10132313
LM26-_ _B
10132314
LM26-_ _C
10132315
LM26-_ _D
FIGURE 1. Output Pin Options Block Diagrams
www.national.com
5


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