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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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TC1023VOA Datenblatt(PDF) 3 Page - TelCom Semiconductor, Inc |
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TC1023VOA Datenblatt(HTML) 3 Page - TelCom Semiconductor, Inc |
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3 / 6 page  3 TC1023 TC1024 PRELIMINARY INFORMATION TC1023/1024-05 6/12/97 PRECISION TEMPERATURE-TO-VOLTAGE CONVERTERS WITH SHUTDOWN MODE DETAILED DESCRIPTION A plot of output voltage versus temperature for both the TC1023 and TC1024 appears in Figure 5. The TC1023 can be used with single power supply to measure temperatures from 0 °C to 100°C. A pull-down resistor (R1 in Figure 1) must be added from the output pin to the negative power supply for measuring temperatures less than 0 °C. The value of the resistor must be chosen to limit the maximum current pulled from the output to the negative supply to – 50 µA (i.e., R1 = VSS/50µA). Figure 1. TC1023 Connections Output Stage Both devices have Class A output stages capable of sourcing 1mA. These devices have a limited ability to drive heavy capacitive loads. Loads of 50pF (to ground) can be driven directly. For heavier loads, a 2k Ω (or greater) resis- tor should be placed in series with the output for decoupling. If the TC1023/1024 is used in a noisy electrical environ- ment, a 0.1 µF bypass capacitor from VCC to GND is recom- mended. Shutdown/Calibrate Mode The TC1023/1024 enters shutdown when the CE input is taken to VIH. This causes quiescent current to fall to 1µA (typ) and the output to drop immediately to 0V through approximately 100k Ω. For applications where the TC1023/ 1024 is connected to an external A/D converter, a refer- ence voltage can be directly connected to VOUT while in shutdown for A/D calibration, as shown in Figure 3. A CMOS gate provides bias voltage to the bandgap refer- ence VR, and at the same time disables the TC102x by taking CE to VIH. Limiting resistor R1 should be chosen to limit current through the voltage reference to the desired current (IREF). That is, R1 = (VOH – VREF)/IREF (where VOH is the CMOS gate output high voltage at output current equal to IREF; and VREF is the reference voltage of VR). Figure 2. TC1024 Connections Figure 3. A/D Calibration Multi-Zone Temperature Sensing The CE input facilitates multi-zone temperature sens- ing as shown in the example of Figure 4. In this example, the processor addresses either of two sensors with a single I/O port pin. The TC102x VOUT pins are connected together and routed to the processor's A/D converter, eliminating the need for separate A/D input channels for each sensor. Figure 4. TC1023/1024 Addressing TC1023 GND CE VCC = 2.2V to 12.0V MIN. VCC V OUT VSS R1 = VSS /50µA VOUT TC102x GND CE V CC VCC VOUT TC102x GND Zone 1/Zone 2 Zone 1 Zone 2 CE VCC VOUT I/O Pin MICROCONTROLLER A/D CONVERTER TC102x GND R1 CE V CC VCC CAL A/D CONVERTER CMOS GATE 2.5V REF VOUT TC1024 GND TC1024 (– 20 °C to +125°C) VCC = 3.0V to 12.0V VCC VOUT CE VOUT |
Ähnliche Teilenummer - TC1023VOA |
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Ähnliche Beschreibung - TC1023VOA |
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