Kontron CP382 - Manual (Page 30)

Functional Description CP382
Page 2 - 4 © 2002 PEP Modular Computers GmbH ID 24208, Rev. 01
2.1.1 High Side Driver Switches
The High Side Driver switches (HSD switches) are able to drive inductive, capacitive or resis-
tive loads. Diagnostic information for the system master and extensive use of electrical protec-
tion are among their main characteristics.
The HSD switches (type L6376 manufactured by SGS THOMSON) constitute the most impor-
tant part of the front end. The L6376 switch realizes a QUAD intelligent power switch which
adapts the digital output signals to the prevailing voltage and current levels and also provides
corresponding mechanisms to protect against undervoltage, overcurrent and overtemperature.
The output voltage level is adapted to the external supply voltage for high level and for low level
output voltage respectively via the integrated FET transistor output stage within the HSD
switch. The HSD switch implements a clamp diode for inductive load driving.
The voltage source for the CP382 front end is implemented using an external voltage source
(nominal +24V, also in the range +9.5V to +35V).
The input signals to the HSD switches are derived from the system side, directly from the out-
puts of the optocoupler devices.
2.1.2 Optoisolation
The process side is galvanically isolated from the system side. The process side of the board
is separated from the system side by a bank of optocouplers which serve to protect the system
side from any excess voltages or voltage spikes.
2.1.3 DO ProComm Controller
The DO ProComm controller is responsible for supervising and controlling the digital data out-
put process and maintaining communication with the CompactPCI system master. Applications
address the CP382 through its software driver interface within the system master whereby the
controller accepts requests from the driver and executes them accordingly. Digital data from the
system master is processed through the DO ProComm controller and then routed to the HSD
switches.