User Guide

PAMS
Technical Documentation
NME–3
Technical Information
Page 60
Issue 1 10/99
Handset (RTE–2HJ)
Power up/Power down procedure HS
This task is divided up between hard– and software to protect accidential
power down of SIM. As long, ”+5V” is below 4.63V, Reset is active (active
LOW, Net: _RESOUT), and min. 20msec after 4.63V was reached. After
_RESET is high, software has to wait in a loop until Net: ”SUPPLYOK”
goes high. This is at the point, where the Voltage supplied via Cable is
over 7 Volt. After this happens, HS–Microcontroller can start the normal
program (with SIM–start). If Voltage supplied via Cable goes below 6.2
Volts, the microcontroller is interupted via ”SUPPLOWIRQ” (active low),
then it must be monitored. If it is low for a certain time, the system has to
be shut down. This shut down should terminate in the wait loop from the
beginning (until SUPPLYOK).
The HS will be connected with a 10 pol RJ45 connector to the cabletree
which is going to the RU.
On the HS PCB there is a 1*10 pol male right angle connector typ SMK
CGP4710–0101 to connect the curly cord to the HS.
D.C. Characteristics
Supply Voltage
To supply the HS different voltages are needed, they are generated from
the 8V supply of the RU. In the HS there are regulators for generating
stabilized 5V and 3V. The following figure shows the power distribution
inside the HS.