Datenblatt-Suchmaschine für elektronische Bauteile |
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LM32CIMT Datenblatt(PDF) 9 Page - National Semiconductor (TI) |
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LM32CIMT Datenblatt(HTML) 9 Page - National Semiconductor (TI) |
9 / 24 page Typical Performance Characteristics Remote Diode Temperature Reading Sensitivity to Diode Filter Capacitance Thermal Diode Capacitor or PCB Leakage Current Effect on Remote Diode Temperature Reading 20071121 20071122 1.0 Functional Description The LM32 measures 3 temperature zones. The LM32 uses a ∆V be temperature sensing method. A differential voltage, representing temperature, is digitized using a Sigma-Delta analog to digital converter. The digitized data can be re- trieved over a simple single-wire interface called Sensor- Path. SensorPath has been defined by National Semicon- ductor and is optimized for hardware monitoring. National offers a royalty-free license in connection with its intellectual property rights in the SensorPath bus. The LM32 has one address pin to allow up to two LM32s to be connected to one SensorPath bus. The physical interface of SensorPath’s SWD signal is identical to the familiar indus- try standard SMBus SMBDAT signal. The digital information is encoded in the pulse width of the signal being transmitted. Every bit can be synchronized by the master simplifying the implementation of the master when using a micro-controller. For micro-controller’s with greater functionality an asynchro- nous attention signal can be transmitted by the LM32 to interrupt the micro-controller and notify it that temperature data has been updated in the readout registers. To optimize the LM32’s power consumption to the system requirements, the LM32 has a shutdown mode and supports multiple conversion rates. 1.1 SensorPath BUS SWD SWD is the Single Wire Data line used for communication. SensorPath uses 3.3V single-ended signaling, with a pull-up resistor and open-drain low-side drive (see Figure 3). For timing purposes SensorPath is designed for capacitive loads (C L) of up to 400pF. Note that in many cases a 3.3V standby rail of the PC will be used as a power supply for both the sensor and the master. Logic high and low voltage levels for SWD are TTL compatible. The master may provide an inter- nal pull-up resistor. In this case the external resistor is not needed. The minimum value of the pull-up resistor must take into account the maximum allowable output load current of 4mA. 1.2 SensorPath BIT SIGNALING Signals are transmitted over SensorPath using pulse-width encoding. There are five types of "bit signals": • Data Bit 0 • Data Bit 1 • Start Bit • Attention Request • Reset All the "bit signals" involve driving the bus to a low level. The duration of the low level differentiates between the different "bit-signals". Each "bit signal" has a fixed pulse width. Sen- sorPath supports a Bus Reset Operation and Clock Training sequence that allows the slave device to synchronize its internal clock rate to the master. Since the LM32 meets the ±15% timing requirements of SensorPath, the LM32 does not require the Clock Training sequence and does not sup- port this feature. This section defines the "bit signal" behav- ior in all the modes. Please refer to the timing diagrams in the Electrical Characteristics section (Figure 1 and Figure 2) while going through this section. Note that the timing dia- grams for the different types of "bit signals" are shown together to better highlight the timing relationships between them. However, the different types of "bit signals" appear on SWD at different points in time. These timing diagrams show the signals as driven by the master and the LM32 slave as well as the signal as seen when probing SWD. Signal labels that begin with the label Mout_ depict a drive by the master. 20071107 FIGURE 3. SensorPath SWD simplified schematic www.national.com 9 |
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Ähnliche Beschreibung - LM32CIMT |
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