Figure 12.2 Pmu Microprocessor Functional Block Diagram - Tait TB8100 Service Manual

Figure 12.2 PMU microprocessor functional block diagram
Fan
Output
Programming
2
I C Port
Summary Alarm
Output
Low Battery
Alarm Output
*optional
AC Converter
DC Converter
204 Power Management Unit Circuit Description
R
Fan
Current Sense
Flash
Vpp
Supply
Vpp Enable
Fan Supply On
2
I C Signals
Summary
Alarm On
0V
Low Battery
Alarm On
0V
The microprocessor can enable or disable the AC converter if the user needs
to test the DC module and battery back-up by simulating a failure of the AC
mains input.
The microprocessor monitors the output voltage and current, the
temperature of the AC module heatsink, and whether the AC mains input
is within the specified range.
The microprocessor controls the on/off function of the DC converter. It
also controls the mode of operation of the DC converter: normal mode,
1
hysteresis mode
page 209 for details on hysteresis mode, and to
below for details on deep sleep mode.
1. A type of "sleep" mode available when the standby power supply card is not
fitted.
Microprocessor
Supply
5V Supply
Data
Run
Voltage Sense
Current Sense
Temperature
AC
Mains OK
Converter
Shutdown
Mains
Input
Standby Supply Isolate
Data
Temperature
DC
Hysteresis Mode
Converter
Run
Battery
Input
Battery
Supply
Standby Supply
Present
Standby
Power
Shutdown
Supply
, or deep sleep mode. Refer to
Auxiliary
Power
Supply*
28V
I
V
0V
On/Off
"Hysteresis Mode" on
"Standby Power Supply"
TB8100 Service Manual
© Tait Electronics Limited September 2006
Auxiliary
Output
PA
Output
Reciter
Output