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CX20415 View Datasheet(PDF) - Conexant Systems

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CX20415 Datasheet PDF : 16 Pages
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Single-Chip FaxEngine Product Family
Single-Chip FaxEngine and Integrated Analog Device
Operator Panel Interface
Tone Generator
Operator Panel functions are supported by the operator
output bus OPO[7:0], the operator input bus OPI [3:0],
and two control outputs (LCDCS and LEDCTRL).
The CXD9450 can directly interface to a 32-key keypad.
External blocking diodes are required to isolate the
keyboard strobe lines from the LED’s, as the LED’s and
keyboard strobe signals use the same lines. Up to 8x15
keyboard array can be supported with external circuitry.
Up to eight LEDs can be directly driven by the CXD9450.
To prevent the dim LED glow that keyboard strobing
would cause, an LED control signal is provided to disable
the LED’s during keyboard strobing.
A 2-line LCD display module with 20 characters per line
can be supported.
Synchronous Serial Interface (SSIF)
Two Synchronous only Serial Interfaces (SSIF) are built
into the CXD9450, which allows it to communicate with
external peripherals. Each SSIF provides separate
signals for Data (SSTXD, SSRXD), Clock (SSCLK), and
Status (SSSTAT). Each SSIF is a duplex, three-wire
system. The SSIF may be configured to operate as
either a master or a slave interface. The bit rate, clock
polarity, clock phase, and data shifting order are
programmable.
Synchronous/Asynchronous Serial Interface (SASIF)
One Synchronous/Asynchronous Serial Interface
(SASIF) performs the following:
Serial-parallel conversion of data received from a
peripheral device
Parallel-to-serial conversion of data for transmission
to a peripheral device
This interface consists of serial transmit data (SASTXD),
serial receive data (SASRXD), and a serial clock
(SASCLK). The SASIF includes a programmable bit rate
generator for asynchronous and synchronous
operations. The data shifting order, data bit number, and
the SASCLK polarity are programmable.
The CXD9450 provides a programmable tone generator
output. The frequency of the tone generator is
programmable from 400 Hz to 4 KHz. By using a PWM
programmable high frequency as a modulation
frequency, the output level can be made programmable.
Watchdog Timer
The Programmable Watchdog Timer is intended to guard
against firmware lockup on the part of either executive-
controlled background tasks or interrupt-driven tasks,
and can only be enabled by a sequence of events under
control of the Watchdog Control Logic. Once the
Watchdog Timer has been enabled, it can not be
disabled unless a system reset occurs.
Reset and Power Control
The RESETn I/O pin provides an internally generated
reset output to external circuits, or it can accept an
externally generated reset signal. This reset signal will
not reset the RTC. Separate RTC battery power inputs
are provided for battery-backup functions. A BATRSTn
pin is provided, which resets the RTC circuits and other
SCC circuits.
Power Up/Down Control
Power Up/Down detection is provided internally. The
threshold voltages are:
Power Up detection level = 2.83 V to 2.95 V
An internally generated power down signal controls
internal switching between primary and battery power.
This control signal is also provided as an output on the
PWRDWNn pin. An externally generated power down
detector (optional) can be provided as an input on the
PWRDWNn pin by setting the INTPWRDWNEn pin.
Real-Time Clock (RTC)
The CXD9450 includes a battery backup real-time clock.
The RTC will automatically maintain the proper date and
time for 32 years. Leap year compensation is included. A
32.768 KHz or 65.536 KHz crystal is required by the
RTC.
6
Conexant
100544C
 

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