AUIPS7221R

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6

Sleep_mode / Diagnostic

Sleep_mode block manages the diagnostic and the sleep_mode. The device enters in sleep mode if input is inactive

during a delay higher than Tsleep.

IN

diag

internal

diag

out

Tdiag

Tdiag

sleep mode

Fault mode

Normal mode

Treset

Tsleep

Figure 1

Bootstrap

The AUIPS7221 integrates a bootstrap regulator to maintain a fixed voltage on the bootstrap capacitor for any battery

voltage. The regulator is off during the sleep mode to reduce the current consumption.

Cboot

Vcc

Out

6V

10mA

Load

The 8mA current source flows permanently on the output when the output is off and the part is not in sleep mode. In case

of an open load condition, the output voltage will be at Vcc-6V.

Wake up sequence

To wake up the part from the sleep mode, the input must be activated at least during Twkp, then the boostrap regulator is

switched on and the boostrap capacitor is charged. The output will be not activated during Tpw on rst.