AS3722 datasheet(54/199 Pages) AMSOSRAM

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Page 53

[v1-01] 2015-Sep-07

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AS3722 − Detailed Descriptions- System Functions

Figure 52:

Start-Up From Multi Cell Batteries

Start-Up From Multi Cell Batteries: Shows basic start-up from a multi cell battery including a 5V pre-regulator

Reset

Description

XRES_IN and XRES_OUT are low active pins. An external pull-up

to the periphery supply has to be added to XRES_IN. XRES_OUT

is a push/pull output to VDD_GPIO_lv.

During each reset cycle the following states are controlled by

the AS3722:

• Power-down sequence of the regulators

• Pin XRES_OUT 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 chapter Start-up)

• Reset is active until the programmable reset timer expires

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

Start-up sequence

t (not to scale)

VBAT

ncells>0

Regulator Voltages

XRES

serial communication possible

res_timer

1-15ms

VBAT rise = ResVoltRise * (ncells +1) programmed in OTP

EN5V

enable external 5V regulator

VSUP

VSUP rise = vsup_min

programmed in OTP

~4ms

debounce

~4ms

debounce

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