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LMT01 Datasheet(PDF) 10 Page - Texas Instruments |
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LMT01 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 23 page VN Voltage Regulator and Output Signal Conditioning VP LMT01-SP Interface Data ADC VREF Thermal Diode Analog Circuitry Chip VDD Chip VSS 10 LMT01-SP SNIS205 – JANUARY 2019 www.ti.com Product Folder Links: LMT01-SP Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The LMT01-SP uses thermal diode analog circuitry to detect the temperature. The temperature signal is then amplified and applied to the input of a ΣΔ ADC that is driven by an internal reference voltage. The ΣΔ ADC output is then processed through the interface circuitry into a digital pulse train. The digital pulse train is then converted to a current pulse train by the output signal conditioning circuitry that includes high and low current regulators. The voltage applied across the pins of the LMT01-SP is regulated by an internal voltage regulator to provide a consistent Chip VDD used by the ADC and its associated circuitry. The current pulse train output can be converted into a voltage with a single resistor. A simple microcontroller comparator or external transistor can be used convert this signal to valid logic levels the microcontroller can process properly through a GPIO pin. The temperature can be determined by gating a simple counter on for a specific time interval to count the total number of output pulses. After power is first applied the device will remain in a low output state while the LMT01-SP determines the temperature. Once the conversion cycle completes, the pulse train begins with a pulse frequency of approximately 88 kHz. The LMT01-SP will continuously convert and transmit data when the power is applied approximately every 104 ms. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Output Interface The LMT01-SP provides a digital output in the form of a pulse count that is transmitted by a train of current pulses. After the LMT01-SP is powered up, it transmits a very low current of 34 µA for less than 54 ms while the part executes a temperature to digital conversion, as shown in Figure 19. When the temperature-to-digital conversion is complete, the LMT01-SP starts to transmit a pulse train that toggles from the low current of 34 µA to a high current level of 125 µA. The pulse train total time interval is at maximum 50 ms. The LMT01-SP transmits a series of pulses equivalent to the pulse count at a given temperature as described in Electrical Characteristics - Pulse Count to Temperature LUT. After the pulse count has been transmitted the LMT01-SP current level will remain low for the remainder of the 50 ms. The total time for the temperature to digital conversion and the pulse train time interval is 104 ms (maximum). If power is continuously applied, the pulse train output will repeat start every 104 ms (maximum). The LMT01-SP can be powered down at any time to conserve system power. To avoid invalid data it is recommended that a minimum power-down wait time of 50 ms is used before the device is turned on again. |
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