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TPL5010 データシート(PDF) 9 Page - Texas Instruments

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部品番号 TPL5010
部品情報  Supply Voltage from 1.8V to 5.5V
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

TPL5010 データシート(HTML) 9 Page - Texas Instruments

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WAKE
DONE
RSTn
DELAY/
M_RST
POR
RESISTANCE
READING
ttIPt
ttR_EXT + tRSTn + tIPt
TPL5010
www.ti.com
SNAS651 – JANUARY 2015
Feature Description (continued)
8.3.3 RSTn
To implement the reset interface between the TPL5010 and the uC a pull-up resistance is required. 100K
Ω 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
20ms).
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 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 asserts periodic WAKE pulses in response to valid DONE pulses
from the uC. If either a manual reset is applied (logic HIGH on DELAY/M_RST pin) or the uC does not issue a
DONE pulse within the required time, the TPL5010 asserts the RSTn signal to the uC 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 500Ω to 170kΩ. At least a 1% precision resistance is recommended. See
section Timer Interval Selection Using External Resistance on 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).
Copyright © 2015, Texas Instruments Incorporated
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