![Infineon Technologies XC2200 User Manual Download Page 344](http://html1.mh-extra.com/html/infineon-technologies/xc2200/xc2200_user-manual_2055439344.webp)
XC2200 Derivatives
System Units (Vol. 1 of 2)
System Control Unit (SCU)
User’s Manual
6-84
V2.1, 2008-08
SCU, V1.13
6.5.1
Supply Watchdog (SWD)
The supply voltage of the pad I/O domain for systems and communication I/Os (DMP_B)
is monitored to validate the overall power supply. The external supply voltage is
monitored for following purposes:
•
POR
Detecting the ramp-up of the external supply voltage, so the device can be started
without requiring an external power-on reset (PORST).
•
Brown-out
Detecting the ramp-down of the external supply voltage, so the device can be brought
into a save state without requiring an external power-on reset (PORST).
•
Monitoring the external power supply allows the usage of a low-cost regulator without
additional status signals (standard 3-pin device).
•
Guarantee that the supply voltage for the EVRs is sufficient to generate a valid core
voltage under every operating condition
Feature list
The following list is a summary of the SWD functions.
•
Trigger a power-on reset whenever the supply falls and as long as the supply remains
below V
VAL
•
Two completely independent threshold levels and comparators
•
16 selectable threshold levels
•
Power Saving Mode (only V
VAL
detection active)