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TPL5110 Datenblatt(PDF) 9 Page - Texas Instruments

Teilenummer TPL5110
Bauteilbeschribung  TPL5110 Nano-power System Timer for Power Gating
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TPL5110 Datenblatt(HTML) 9 Page - Texas Instruments

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DRV
DONE
EN/
ONE_SHOT
DELAY/
M_DRV
ttIPt
POR
RESISTANCE
READING
DRV
DONE
EN/
ONE_SHOT
DELAY/
M_DRV
ttIPt
POR
RESISTANCE
READING
ttIPt
ttDRVt
MISSED
DONE
FORCED
DRV RISING
9
TPL5110
www.ti.com
SNAS650 – JANUARY 2015 – REVISED JANUARY 2015
Product Folder Links: TPL5110
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Copyright © 2015, Texas Instruments Incorporated
8.4 Device Functional Modes
8.4.1 Startup
During startup, after POR, the TPL5110 executes a one-time measurement of the resistance attached to the
DELAY/M_DRV pin in order to determine the desired time interval for DRV. This measurement interval is tR_EXT.
During this measurement a constant current is temporarily flowing into REXT.
Once the reading of the external resistance is completed the TPL5110 enters automatically in one of the 2
modes according to the EN/ONE_SHOT value.The EN/ONE_SHOT pin needs to be hard wired to GND or VDD
according to the required mode of operation.
Figure 8. Startup - Timer mode
8.4.2 Timer Mode
During timer mode (EN/ONE_SHOT = HIGH), the TPL5110 asserts periodic DRV pulses according to the
programmed time interval. The length of the DRV pulses is set by the receiving of a DONE pulse from the uC.
See Figure 8.
8.4.3 One Shot Mode
During One shot mode (EN/ONE_SHOT = LOW), the TPL5110 generates just one pulse at the DRV pin which
lasts according to the programmed time interval. In one-shot mode, other DRV pulses can be triggered using the
DELAY/M_DRV pin. If a valid manual power ON occurs when EN/ONE_SHOT is LOW, the TPL5110 generates
just one pulse at the DRV pin. The duration of the pulse is set by the programmed time interval. Also in this case,
if a DONE signal is received within the programmed time interval (minus 50ms), the MOSFET connected to the
DRV pin is turned off. See Figure 9 and Figure 10.
Figure 9. Startup One Shot Mode, (DONE received within tIP)


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