AS3701 datasheet(39/110 Pages) AMSOSRAM

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Page 38

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[v1-11] 2016-Dec-14

AS3701 − Detailed Description – System Functions

Figure 46:

Start-Up Sequence Diagram 5/5

Start-Up Sequence: This diagram shows the timing of an external initiated reset command (forcing XRES to low)

followed by a startup (battery and/or USB charger adapter connected, VSUP > ResVoltRise)

Reset

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 AS3701:

• Pin XRES is forced to GND

• Normal startup with programmable power-ON sequence

and regulator voltages

• Reset is active until the programmable reset timer (set by

res_timer [ResetTimer]) expires

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

except the reset control- and status-registers.

• XRES is pulled high by the external resistor and the whole

system is leaving the reset state

Note(s): Programming is controlled by the internal Boot-OTP

VSUP > ResVoltRise

0ms delay (if Reg1_delay =0)

1ms delay (if Reg1_delay = 1 and del_time =0)

4ms delay (if Reg1_delay = 1 and del_time =1)

10..150ms set by res_timer in O TP

XRES

0ms delay (if Reg4_delay =0)

1ms delay (if Reg4_delay = 1 and del_time =0)

4ms delay (if Reg4_delay = 1 and del_time =1)

PWRGood

1ms delay

between last timeslot (regulator) and

PWRGood signal going high

reg1_V (b0:7 fuse abh)

reg4_V (b0:7 fuse afh)

0, 8, 16 or 32ms OFF delay

external HW

reset command

5ms debounce

VSUP >

ResVoltRise

8ms

OFF delay

Reg1_addr

(b0:3 fuse aah)

Reg4_addr

(b4:7 fuse adh)

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