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AMC7812SPAPR Datasheet(PDF) 35 Page - Texas Instruments |
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AMC7812SPAPR Datasheet(HTML) 35 Page - Texas Instruments |
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35 / 92 page  Remote Temperature Registers LPFandSignal Conditioning Mux SW1 I LOW SW2 I HIGH V BIAS D+ SecondADC andSignal Processing D- Diode Temperature Sensor SW1 I LOW SecondADC andSignal Processing LPFandSignal Conditioning Local Temperature Registers Mux SW2 I HIGH V V = - BE_HIGH BE_LOW ln h kT q () I I HIGH LOW AMC7812 www.ti.com SBAS513E – JANUARY 2011 – REVISED SEPTEMBER 2013 SECONDARY ADC/TEMPERATURE SENSOR OPERATION The AMC7812 contains one local and two remote temperature sensors. The temperature sensors continuously monitor the three temperature inputs, and new readings are automatically available every cycle. The on-chip integrated temperature sensor (shown in Figure 86) is used to measure the device temperature, and two remote diode sensor inputs are used to measure the two external temperatures. All analog signals are converted by the secondary ADC that runs in the background at a lower speed. The measurement relies on the characteristics of a semiconductor junction operation at a fixed current level. The forward voltage of the diode (VBE) depends on the current passing through it and the ambient temperature. The change in VBE when the diode operates at two different currents (a low current of ILOW and a high current of IHIGH, is shown in Equation 1: Where: k is Boltzmann's constant. q is the charge of the carrier. T is the absolute temperature in Kelvins (K). η is the ideality of the transistor as sensor. (1) Figure 86. Integrated Local Temperature Sensor The remote sensing transistor can be a discrete small-signal type transistor or substrate transistor built within the microprocessor. This architecture is shown in Figure 87. An internal voltage source biases the D– terminal above ground to prevent the ground noise from interfering with the measurement. An external capacitor (up to 330pF) may be placed between D+ and D– to further reduce noise interference. Figure 87. Remote Temperature Sensor Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 35 Product Folder Links: AMC7812 |
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