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TPL5010 数据表(PDF) 9 Page - Texas Instruments |
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TPL5010 数据表(HTML) 9 Page - Texas Instruments |
9 / 22 page WAKE DONE RSTn DELAY/ M_RST POR RESISTANCE READING ttIPt ttR_EXT + tRSTn + tIPt 9 TPL5010-Q1 www.ti.com SNAS679 – SEPTEMBER 2016 Product Folder Links: TPL5010-Q1 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Feature Description (continued) 8.3.3 RSTn To implement the reset interface between the TPL5010-Q1 and the µC a pull-up resistance is required. 100 kΩ is recommended, to minimize current. During the POR and the reading of the REXT the RSTn signal is LOW. RSTn is asserted (LOW) for either one of the following conditions: • 1. If the DELAY/M_RST pin is high for at least two consecutive cycles of the internal oscillator (approximately 20 ms). • 2. At the beginning of a new time interval if DONE is not received at least 20 ms before the next WAKE rising edge (see Figure 8). 8.4 Device Functional Modes 8.4.1 Startup During startup, after POR, the TPL5010-Q1 executes a one-time measurement of the resistance attached to the DELAY/M_RST pin in order to determine the desired time interval for WAKE. This measurement interval is tR_EXT. During this measurement a constant current is temporarily flowing into REXT. Figure 9. Startup 8.4.2 Normal Operating Mode During normal operating mode, the TPL5010-Q1 asserts periodic WAKE pulses in response to valid DONE pulses from the µC. If either a manual reset is applied (logic HIGH on DELAY/M_RST pin) or the µC does not issue a DONE pulse within the required time, the TPL5010-Q1 asserts the RSTn signal to the µC and restarts its internal counters. See Figure 8 and Figure 10 . 8.5 Programming 8.5.1 Configuring the WAKE Interval with the DELAY/M_RST Pin The time interval between 2 adjacent WAKE pulses (rising edges) is selectable through an external resistance (REXT) between the DELAY/M_RST pin and ground. The value of the resistance REXT is converted one time after POR. The allowable range of REXT is 500 Ω to 170 kΩ. At least a 1% precision resistance is recommended. See Timer Interval Selection Using External Resistance for how to set the WAKE pulse interval using REXT. The time between 2 adjacent RESET signals (falling edges) or between a RESET (falling edge) and a WAKE (rising edge) is given by the sum of the programmed time interval and the tRSTn (reset pulse width). |
类似零件编号 - TPL5010 |
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类似说明 - TPL5010 |
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