AS3701 datasheet(35/110 Pages) AMSOSRAM

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[v1-11] 2016-Dec-14

AS3701 − Detailed Description – System Functions

Start-Up

Normal Start-Up

The following gives a brief description on a start-up from

scratch (battery or charger insertion). More details can be found

in the start-up flow chart.

A start-up can be activated from 5 different sources:

• Battery insertion from scratch

• Charger insertion from scratch (VBAT < ResVoltFall)

• ON-key has been pulled high in power_off mode

• Reset cycle

• ResVoltRise level was reached

During a normal reset cycle a normal startup happens:

• Setting USB current limit and ResVoltRise

• Startup State machine reads out the internal Boot-OTP.

The start-up sequence of SD Converter, LDOs and GPIOs

are controlled by the Boot-OTP

• Reset-Timer is set by the Boot-OTP

• The reset is released when the Reset Timer expires

(external pin XRES)

Parameter

Figure 40:

Start-Up Condition

Note(s):

1. The internal pull-down resistor is just active if the bit on_invert is set to "0" (active high configuration). If the ON-key works active

low (on_invert = 1) the internal pull-down resistor is deactivated and an external pull-up resistor is needed in push-button

configuration!

Symbol

Parameter

Note

Min

Typ

Max

Unit

VON_IL

Low level voltage

ON pin

20% of

VSUP

VON_IH

High level voltage

ON pin

60% of

VSUP

ION_PD

(1)

Pull down current

Bit on_invert = 0 (active

high)

412

μA

Detailed Description –

System Functions

AS3701 Datasheet(PDF) 35 Page - ams-OSRAM AG

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