AS3715 datasheet(61/159 Pages) AMSOSRAM

61 / 159 page

Page 60

ams Datasheet

Document Feedback

[v1-03] 2015-Aug-10

AS3715 − Detailed Description – System Functions

Watchdog Reset

If the watchdog is armed (register bit wtdg_on = 1 and

wtdg_res_on= 1) and the timer expires it causes a reset.

(see Watchdog).

Long ONKEY/ENx Press

When applying a high level on the ONKEY or ENx input pins for

4s/8s (depending on on_reset_delay) a reset or power_off

(depending on onkey_lpress_reset) is initiated. This is thought

as a safety feature when the SW hangs up and no watchdog is

used.

Figure 61:

ONKEY/ENx Long Press Behavior

ONKEY/ENx Long Press Behavior: Shows the selectable options for behaving on a long press.

Reset and Power-OFF Sequence

The regulator power-down sequence is inverted to the

power-up sequence programmed in the OTP. It can be slightly

modified by setting or clearing the sdX_sequ_on and

ldoX_sequ_on bits. The bit is set automatically for all the

regulators defined in the OTP start-up sequence.

• Regulators which have the corresponding sequ_on bit

cleared will be shut down before the power-down

sequence starts.

• Regulators which have the bit set and are in the power-up

sequence of the OTP will shut down in an inverted order.

• Regulators which have the bit set and are not part of the

power-up sequence will shut down after the sequence has

been completed.

onkey_lpress_reset

on_reset_delay

Long Press Behavior

power_off after 8s long press delay

power_off after 4s long press delay

reset_cycle after 8s long press delay

long press feature disabled

AS3715 Datasheet(PDF) 61 Page - ams-OSRAM AG