Power Requirements
PHYTEC Messtechnik GmbH 2005 L-645e_1
35
4.1
Voltage Supervision and Reset
The input v3V3 as well as the on-board generated operation
vo2V5 and +1V5 are monitored by a voltage supervisor device
at U23. This circuitry is responsible for generation of the system reset
signal /RSTI. The voltage supervisor IC initiates a reset cycle if any
operating voltage drops below its minimum threshold value. After all
voltages reach their required value, the supervisor chip adds an
additional 200 ms delay until the /RSTI line will be inactive (high).
/RSTI connects to the processor reset input.
/RSTI is a bi-directional signal that can be connected to more then one
source. For instance, /RSTI is also connected to the BDM connector of
the phyCORE module. The resistance of the signal is 1kOhm.
Special care must be taken when using this signal externally. Do not
connect push buttons or long signal lines to this port because this can
lead to undesired behavior on this local system reset signal. To
connect external reset sources such as push buttons e.g. use the input
port /RESIN. /RESIN is connected to a 10kOhm pull-up resistor.
Summary of Contents for phyCORE-MCF548x
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