AS3701 datasheet(40/110 Pages) AMSOSRAM

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Page 39

[v1-11] 2016-Dec-14

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AS3701 − Detailed Description – System Functions

RESET Reasons

Reset can be activated from the below mentioned different

sources:

• VPOR has been reached (VSUP rising from the scratch)

• ResVoltFall was reached (VSUP < ResVoltFall [Battery_

voltage_monitor])

• Software forced reset (force_reset [ResetControl] = 1)

• XRES is pulled to low

• ON-key long press (on_tast_sw is set to "0")

• Overtemperature

Voltage Detection

A Reset gets initiated, if VSUP rises from scratch and reaches the

VPOR level. The pin XRES is only released if VSUP is above

ResVoltRise.

VXRES_fall is only accepted if the reset condition is longer than

VXRES_mask. This guard time is used to avoid a complete reset of

the system in case of short drops of VSUP.

Figure 47:

Voltage Detection Reset

Software Forced Reset

Writing “1” into the register bit force_reset [ResetControl]

immediately starts a reset cycle. The bit force_reset is

automatically cleared by this reset.

External Triggered Reset

If the pin XRES is pulled from high to low by an external source

(e.g. microprocessor or button) a reset cycle is started as well.

SupResEn

power_off_at_vsuplow = 0

A reset is initiated, if VSUP < 2.7V.

If enabled, an interrupt is executed at ResVoltFall.

Automatic restart, if VSUP > ResVoltRise.

A reset is initiated, if VSUP < ResVoltFall.

Automatic restart, if VSUP > ResVoltRise.

AS3701 Datasheet(PDF) 40 Page - ams-OSRAM AG