AS3715 datasheet(58/159 Pages) AMSOSRAM

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Page 57

[v1-03] 2015-Aug-10

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AS3715 − Detailed Description – System Functions

Start-Up Reasons

A Start-up can be activated from 4 different sources:

• VPOR has been reached (VUSB/VSUP/VBAT rising from

scratch)

• ONKEY or ENx has been pulled high in power_off mode

• Reset cycle

• ResVoltRise was reached

Parameter

Figure 58:

ONKEY/ENx-Input Start-Up Conditions

ONKEY-Input Start-Up Conditions: Shows the electrical parameter for the ONKEY input initiating the start-up.

Reset

Description

XRES is a low active bi-directional pin. An external pull-up to

the periphery supply has to be added.

During each reset cycle the following states are controlled by

the AS3715:

• Power-down sequence of the regulators

• Pin XRES is forced to GND

• All registers are set to their default values after power-ON,

except the reset control- and status-registers.

• Normal startup with programmable power-ON sequence

and regulator voltages (see Start-Up)

• Reset is active until the programmable reset timer expires

(set by register bits res_timer<2:0>)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VUSBON

Voltage in VUSB for system to start

4.2

5.0

VON_IL

ONKEY/ENx Low Level input voltage

–0.3

0.4

VON_IH

ONKEY/ENx High Level input

1.4

VVSUP_

GPIO

ION_PD

ONKEY/ENx Pull down current

μA

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