AS3658F-BCTP datasheet(124/158 Pages) AMSCO

124 / 158 page

Table 129. Charger supervision

Addr:14

Fuel Gauge

This bit controls first startup out of power on reset

Bit

Bit Name

Default

Access

Description

Table 130. Fuel Gauge

Addr:15

Fuel Gauge

This bit controls first startup out of power on reset

Bit

Bit Name

Default

Access

Description

www.austriamicrosystems.com

Revision 1v13

123 - 157

AS3658

Data Sheet Confidential - Deta il ed Descri ption - System Functi ons

10.2.3 Reset Cycle

During a reset cycle the pin XRESET is forced to low for at least RESTIME and all registers are set to their default

values (except the registers marked green in theTable 186 on page 148). During the reset time a normal startup

happens (see Startup on page 129), the reset is active until the reset timer (set by register bits res_timer<2:0>) expires.

Then the voltage on the pin XRESET is pulled high by the external resistor and the whole system is leaving the reset

state.

10.2.4 Reset Control: res_con

Reset is internally generated from a power supply supervisor and provided to internal logic as well as externally

through the open-drain pad XRESET. At this point, it could be also forced externally from an external power supply

supervisor. Additionally Reset can be forced by software.

auto_shutdown

Boot

ROM

R/W

Switch on Power off mode at first startup(e.g. First

battery insertion or first charger insertion)

Startup of all regulators if battery is inserted,

charger insertion, onkey pressed or rtc alarm.

Startup of all regulators only if onkey is

pressed or rtc alarm (no startup on battery

insertion; no startup if charger detected, if

no_charging=0). xon_enable has to be set in

bootrom.

If a charger is detected and the bit

no_charging=0 (defined by BootROM) and

ch_pwroff_en=0 the AS3658 will start

charging without regulators startup (fully

autonomous charging).

If the bit no_charging=1 and a charger is

detected, the regulators are started and the

charging can be enabled with software

control.

power_off_at_v_suplow

Boot

ROM

R/W

Switch on Power off mode if low Vsupply is detected

during active or standby mode (Pin XON= high and bit

xon_enable=0)

If low battery is detected, continuously monitor

battery voltage and startup if battery voltage is

above ResVoltrise

If low battery is detected, enter power off

mode

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