データシートサーチシステム |
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TPL5000 データシート(PDF) 10 Page - Texas Instruments |
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TPL5000 データシート(HTML) 10 Page - Texas Instruments |
10 / 21 page RSTn TCAL WAKE DONE INT. OSC. PGOOD A B C D TPL5000 SNAS628B – JULY 2013 – REVISED DECEMBER 2014 www.ti.com Feature Description (continued) The frame, D, shows a typical PGOOD, high to low transition. As soon as PGOOD is low, the internal oscillator is powered OFF and the digital output pins, TCAL, RSTn, and WAKE, are asynchronously reset by the falling edge of the PGOOD signal, such that TCAL and WAKE reset at low logical values, while RSTn resets at a high logical value. Figure 7. Timing PGOOD, WAKE, RSTN, TCAL 8.3.1.3 Watchdog Feature Most of the microcontroller-based systems need to be self-reliant; if the software hangs for any reason, the microcontroller must be reset. The TPL5000 can provide this functionality by connecting a microcontroller programmable output pin to the DONE input pin. If the DONE line does not toggle within the selected delay period, then the microcontroller is not operating properly and must be reset. The TPL5000 recognizes a valid DONE signal as a low to high transition; if two DONE signals are received within the delay period the second signal is ignored. In the TPL5000, the watchdog window and the delay period are equivalent. A valid "DONE" signal resets the watchdog counter only, and not the delay time counter. A PGOOD low to high transition clears both the watchdog and delay time counters. Figure 6 shows the watchdog feature of the TPL5000. The sequence A, B, C is a standard sequence with the microcontroller working properly. In this normal sequence, the microcontroller sends a valid "DONE" (arrow B) before the end of the delay period. The sequence C, D ,E is an anomalous sequence in which the microcontroller is not in a valid state, and it does not send the DONE signal (dashed pulse) before the end of the delay period. The TPL5000 determines the microcontroller is hung and sends a RESET signal (arrow E) when the period delay has elapsed. 8.3.1.4 Different Utilizations of the TPL5000 When either the watchdog or the supervisor feature of the TPL5000 are not required, it is possible to disable them reducing the interconnections between the TPL5000 and the microcontroller. Connecting the DONE pin either to GND or to TCAL pin disables the watchdog feature. If connected to GND, the TPL5000 only sends a reset pulse when the time delay elapses. If DONE is connected to TCAL, the TPL5000 sends out just one RESET pulse after a PGOOD low to high transition, when the time delay elapses and then WAKE pulses when the successive time delay elapses. Connecting the PGOOD pin to the supply pin of the TPL5000 disables the supervisor feature. 10 Submit Documentation Feedback Copyright © 2013–2014, Texas Instruments Incorporated Product Folder Links: TPL5000 |
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同様の説明 - TPL5000 |
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