MLX32001 View Datasheet(PDF) - Melexis Microelectronic Systems
Part Name
Description
Manufacturer
MLX32001 Datasheet PDF : 11 Pages
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4.2 PC-Voice application
MLX32001
Universal PSTN Line Interface
4.3 PSTN Line powered modem application
5. Description
MLX32001 implements the DC-handler of a universal PSTN
Line Interface. It is fully telephone line powered and digital 1)
control is performed by a special UARTFLEX. There is no
crystal or resonator linked to MLX32001 and thus the core as
well as the UART are capable to adapt themselves to the
HOST UART's preferred communication speeds. The
synchronisation time of the UART is 2400 bps +/- 25%.
To ensure that long term drift and temperature will not affect 2)
communication stability, the communication channel must be
synchronised on a frequent basis. If the line conditions get
low and MLX32001 has to switch down to 1 of its 4 low
power modes, synchronisation locking expires to ensure that
power supply dependent communication times will never
unlock.
There are 64 bytes (512 bits) of user RAM accessible in
MLX32001 to store country and network operator depen-dent
settings. These settings are retrieved from a small parameter 3)
database that supports data originating from the following 3
sources:
Type Approval Regulations that more or less specify
the network (e.g. what kind of AC termination is
required; what levels of open line voltages, ring
voltages and online currents can be expected; how are
transient timings for online / offline / CLIP and
polarity dependent phenomena specified, what
common mode unbalance is required)
Design and market Experience: Known network errors
and network non-compliance problems can be
implemented in MLX32001 drivers and state machine
to let the line interface properly handle interworking
problems (e.g. how much spikes can be expected
during polarity reversal; how much time does it take
the power supply SLIC to switch between online
detect and online supply mode; what total current
interruptions can be expected; how much time can
pass before an acceptable dialtone is detected)
Local Line Adaptation: Local line adaptation is
defined as the ability to measure the telephone line
conditions of the actual network termination point
Page 2 of 11
MLX32001 Universal PSTN Line Interface / Rev1.2
17 May 2000
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