AS3715 datasheet(57/159 Pages) AMSOSRAM

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[v1-03] 2015-Aug-10

AS3715 − Detailed Description – System Functions

Normal Startup

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

scratch (battery insertion). More details can be found in the

start-up flow charts.

• Powering up V2_5 (wait till it’s above VPOR)

• The external capacitor on CREF is charged to 1.8V.

• Check if VSUP is above ResVoltRise

• Configuration of Charger (DCDC or linear) and SDx slave

modes is read from Boot-OTP

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

The start-up sequence of Step-Down Converter, LDO’s 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)

Figure 57:

Regulator Power-Up Sequence

Regulator Power-Up Sequence: Shows timing relationships of the regulators and corresponding control signals

during power-up.

Reg1_select

VSUP

VSUP > ResVoltRise set in OTP

4ms

debounce

Reg2_select

0, 1, 4 or 12ms delay

depending on Reg2_gpio_sel

and del _time

Reg11_select

. . . . . . .

0, 1, 4 or 12ms delay

depending on Reg1_gpio_sel

and del _time

10..150ms set by res_timer in OTP

XRES

0, 1, 4 or 12ms delay

depending on Reg11_gpio_sel

and del _time

. . .

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