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TPL5010 Datasheet(PDF) 8 Page - Texas Instruments |
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TPL5010 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 25 page WAKE DONE RSTn DELAY/ M_RST ttIPt ttIPt ttRSTn+ tIPt MISSED DONE LOW FREQUENCY OSCILLATOR FREQUENCY DIVIDER RSTn WAKE VDD GND DELAY/ M_RST DECODER & MANUAL RESET DETECTOR LOGIC CONTROL DONE 8 TPL5010 SNAS651 – JANUARY 2015 www.ti.com Product Folder Links: TPL5010 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The TPL5010 is a system wakeup timer with a watchdog feature, ideal for low power applications. TPL5010 is ideal for use in interrupt-driven applications and provides selectable timing from 100ms to 7200s. 8.2 Functional Block Diagram 8.3 Feature Description The DONE, WAKE and RSTn signals are used to implement the watchdog function. The TPL5010 is programmed to issue a periodic WAKE pulse to a µC which is in sleep or standby mode. After receiving the WAKE pulse, the µC must issue a DONE signal to the TPL5010 at least 20ms before the rising edge of the next WAKE pulse. If the DONE signal is not asserted, the TPL5010 asserts the RSTn signal to reset the µC. A manual reset function is realized by momentarily pulling the DELAY/M_RST pin to VDD. Figure 8. Watchdog 8.3.1 WAKE The WAKE pulse is sent out from the TPL5010 when the programmed time interval starts (except at the beginning of the first cycle or if in the previous interval the DONE has not been received). This signal is normally low. 8.3.2 DONE The DONE pin is driven by a µC to signal successful processing of the WAKE signal. The TPL5010 recognizes a valid DONE signal as a low to high transition; if two or more DONE signals are received within the time interval, only the first DONE signal is processed. The DONE signal resets the counter of the watchdog only. If the DONE signal is received when the WAKE is still high, the WAKE will go low as soon as the DONE is recognized. |
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