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TPL5100 데이터시트(PDF) 9 Page - Texas Instruments |
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TPL5100 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 14 page TCAL DONE MOS_DRV INT. OSC. PGOOD A B C D TPL5100 www.ti.com SNAS629B – JULY 2013 – REVISED AUGUST 2013 Figure 5. Timing MOS_DRV, TCAL Supervisor Feature A critical event that can corrupt the memory of a µC is a voltage supply drop (supply lower than minimum operating range), and a reset of the µC is mandatory if this occurs. Since the TPL5100 is the right choice in systems which stay most of the time in deep sleep or completely OFF, due to its ultra low power consumption, it is fundamental that it takes into account the voltage drop events. The TPL5100 implements the supervisor feature when working with some power management ICs, which indicate the status of the supply voltage with a power good or battery good output. The supervisory functionality is enabled by simply connecting the Battery management power good output to the TPL5100 PGOOD pin. If this feature is not used connect the PGOOD pin to VDD. In case the power management IC detects a voltage drop while the µC is OFF, consequently lowering the PGOOD line, the TPL5100 resets its internal counter and does not allow the micro to turn ON until the PGOOD is high again. This series of events allows the µC to avoid working in an unsafe voltage supply condition. If the PGOOD signal is lowered while the µC is ON, the TPL51000 turns the µC OFF. The micro will be turned ON when PGOOD is high again and the selected delay is elapsed. Calibration Pulse The TPL5100 is based on an ultra-low power oscillator, which has a relatively low frequency and low accuracy; however, it shows very good cycle to cycle repeatability and very low temperature drift. In most of the applications, the accuracy of the oscillator is enough, but if a more accurate measure of the delay period is required, it is possible to measure the base period of the internal oscillator. A single pulse, which has the same duration as the base period of the internal oscillator, is present at the TCAL pin of the TPL5100. This pulse starts after a half period of the internal oscillator, from the falling edge of the MOS_DRV pulse. A µC connected to the TPL5100 can routinely measure the width of the TCAL pulse, using a counter and an external crystal. Once the base period of the TPL5100 is measured, the actual time delay is calculated by multiplying the measured period by a factor, N (see Table 1), dependent upon the nominal selected time delay. The resolution and the accuracy of the measurement depend upon the external crystal. Since the frequency of the internal oscillator of the TPL5100 is very stable, the measurement of the calibration pulse is suggested only when a high gradient of ambient temperature is observed. The measurement of the TCAL pulse is useful in battery-powered applications that implement a precise battery life counter in the µC. Copyright © 2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPL5100 |
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