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LM1042 bảng dữ liệu(PDF) 7 Page - National Semiconductor (TI) |
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LM1042 bảng dữ liệu(HTML) 7 Page - National Semiconductor (TI) |
7 / 8 page Application Notes (Continued) TLH8709 – 12 FIGURE 9 PROBE CURRENT REFERENCE CIRCUIT The circuit defining the probe circuit is given in Figure 10 A reference voltage is obtained from a bandgap regulator de- rived current flowing in a diode resistor chain to set up a voltage 2 volts below the supply This is applied to an ampli- fier driving an external PNP transistor to maintain pin 3 at 2V below supply The emitter resistance from pin 3 to supply defines the current which less the base current flows in the probe Because of the sensitivity of the measurement to probe current evident in Figure 3 the current should be ad- justed by means of a variable resistor to the desired value This adjustment may also be used to take out probe toler- ances TLH8709 – 13 FIGURE 10 TYPICAL APPLICATIONS CIRCUIT A typical automotive application circuit is shown in Figure 11 where the probe selection signal is obtained from the oil pressure switch At power up (ignition on) the oil pressure switch is closed and pin 8 is held low by R4 causing a probe 1 (oil level) measurement to be made Once the engine has started the oil pressure switch opens and D1 pulls pin 8 high changing over to the second auxiliary probe input The ca- pacitor C5 holds pin 8 high in the event of a stalled engine so that a second probe 1 measurement can not occur in disturbed oil Non-automotive applications may drive pin 8 directly with a logic signal TLH8709 – 14 FIGURE 11 Typical Application Circuit 7 |
Số phần tương tự - LM1042 |
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Mô tả tương tự - LM1042 |
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