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LM26CIM5-PHA Folha de dados(PDF) 5 Page - National Semiconductor (TI) |
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LM26CIM5-PHA Folha de dados(HTML) 5 Page - National Semiconductor (TI) |
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5 / 9 page  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 |
Nº de peça semelhante - LM26CIM5-PHA |
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Descrição semelhante - LM26CIM5-PHA |
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