DRV

DONE

EN/

ONE_SHOT

DELAY/

M_DRV

POR

RESISTANCE

READING

DRV

DONE

EN/

ONE_SHOT

DELAY/

M_DRV

POR

RESISTANCE

READING

MISSED

DONE

FORCED

DRV RISING

TPL5110

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SNAS650 – JANUARY 2015 – REVISED JANUARY 2015

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

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.

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