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LM57-Q1 Datasheet(PDF) 22 Page - Texas Instruments |
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LM57-Q1 Datasheet(HTML) 22 Page - Texas Instruments |
22 / 38 page ![]() LM57-Q1 SNIS191A – JULY 2015 – REVISED JULY 2015 www.ti.com 7.3.4 TOVER and TOVER Digital Outputs The TOVER active high, push-pull output and the TOVER Active Low, Open-Drain Output both assert at the same time whenever the Die Temperature reaches the Trip Point. They also assert simultaneously whenever the TRIP TEST pin is set high. Both outputs de-assert when the die temperature goes below the (Temperature Trip Point) - (Hysteresis). These two types of digital outputs enable the user the flexibility to choose the type of output that is most suitable for his design. Either the TOVER or the TOVER Digital Output pins can be left open if not used. The TOVER Active Low, Open-Drain Digital Output, if used, requires a pullup resistor between this pin and VDD. 7.3.4.1 TOVER and TOVER Noise Immunity The LM57-Q1 has some noise immunity to a premature trigger due to noise on the power supply. With the die temperature at 1°C below the trip point, there are no premature triggers for a square wave injected into the power supply with a magnitude of 100 mVPP over a frequency range of 100 Hz to 2 MHz. Above the frequency a premature trigger may occur. With the die temperature at 2°C below the trip point, and a magnitude of 200 mVPP, there are no premature triggers from 100 Hz to 300 kHz. Above that frequency a premature trigger may occur. Therefore if the supply line is noisy, it is recommended that a local supply decoupling capacitor be used to reduce that noise. 7.3.5 Trip Test Digital Input The TRIP TEST pin provides a means to test the digital outputs by causing them to assert, regardless of temperature. In addition, when the TRIP TEST pin is pulled high the VTEMP pin will be at the VTRIP voltage. 7.3.6 VTEMP Analog Temperature Sensor Output The VTEMP push-pull output provides the ability to sink and source significant current. This is beneficial when, for example, driving dynamic loads like an input stage on an analog-to-digital converter (ADC). In these applications the source current is required to quickly charge the input capacitor of the ADC. See the Typical Application section for more discussion of this topic. The LM57-Q1 is ideal for this and other applications which require strong source or sink current. 7.3.6.1 VTEMP Noise Considerations A load capacitor on VTEMP can help to filter noise. For noisy environments, TI recommends a 100 nF supply decoupling capacitor placed closed across VDD and GND pins of LM57-Q1. 22 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: LM57-Q1 |
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