SC614 v1.0 Power module for RCBus-40pin

This module provides a regulated 5-volt supply to the backplane. Voltage input is between 8 and 15 volts D.C. at a maximum of 1 ampere. The regulator will get warm in normal use. The higher the input voltage and the greater the current load, the hotter it will get. The input can be connected to either J1 (centre positive) or the screw terminal J2.

The 5-volt output is connected to the backplane and is also available at screw terminal J3 and header pins P3.

The system reset signal is generated at power up, upon pressing switch SW2, or with an external switch connected to P2. The power up reset is generated by the voltage supervisor U2. The supervisor will also hold the system in reset if the 5-volt supply drops below about 4.75 volts. In addition, the supervisor cleans up the reset signal generated with the reset button.

The system should only have one enabled voltage supervisor. If there is another one in the system, one of them needs to be disabled. The circuit on this module is likely to be the best one, so ideally keep this one enabled and disable any others. To enable the supervisor on this module, fit a jumper shunt to header pins JP1.