CMX808A View Datasheet(PDF) - MX-COM Inc
Part Name
Description
Manufacturer
CMX808A Datasheet PDF : 22 Pages
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Family Radio Service CTCSS Processor
4
2 Signal List
CMX808A Preliminary Information
Package /
Pin No
E3 P4
11
22
Signal
Name
XTAL
XTAL/CLOCK
33
SERIAL CLOCK
4 4 COMMAND DATA
55
REPLY DATA
66
CS
77
IRQ
88
9
9 10
NC
NC
A/D CAP
11
NC
10 12
VSS
11 13
VBIAS
12 14
RX AMP IN
13 15
RX AMP OUT
14 16
RX AUDIO OUT
17
NC
15 18
TX AUDIO IN
16 19
TX AUDIO OUT
17 20
VOLUME IN
18 21 TX SUB AUDIO OUT
19 22
VOLUME OUT
Type
output
input
input
input
output
input
output
output
Power
output
input
output
output
input
output
input
output
output
Description
The inverted output of the on-chip oscillator.
The input to the on-chip oscillator, for external Xtal circuit or
clock.
The "C-BUS" serial clock input. This clock, produced by the
µC, is used for transfer timing of commands and data to and
from the device. See Figure 6.
The "C-BUS" serial data input from the µC. Data is loaded
into this device in 8-bit bytes, MSB (D7) first, and LSB (D0)
last, synchronized to the SERIAL CLOCK. See Figure 6.
The "C-BUS" serial data output to the µC. The transmission
of REPLY DATA bytes is synchronized to the SERIAL
CLOCK under the control of the CS input. This 3-state
output is held at high impedance when not sending data to
the µC. See Figure 6.
The "C-BUS" data loading control function: this input is
provided by the µC. Data transfer sequences are initiated,
completed or aborted by the CS signal. See Figure 6.
This output indicates an interrupt condition to the µC by
going to a logic "0". This is a "wire-ORable" output,
enabling the connection of up to 8 peripherals to 1 interrupt
port on the µC. This pin has a low impedance pulldown to
logic "0" when active and a high-impedance when inactive.
An external pull-up resistor is required. An interrupt is
effective if not masked out by the IRQ MASK (bit 0 in the
SUB-AUDIO CONTROL register $80).
No internal connection. Do not make any connection to
these pins.
An internal reference voltage for the A to D converter,
decoupled to VSS by an external capacitor.
No internal connection. Do not make any connection to this
pin.
The negative supply rail (ground).
A bias line for the internal circuitry, held at VDD/2. This pin
must be decoupled by a capacitor mounted close to the
device pins.
The inverting input to the Rx input amplifier.
The output of the Rx input amplifier and the input to the
audio filter section.
Output of the Rx audio filter section.
No internal connection. Do not make any connection to this
pin.
Input to the Tx audio filter section.
Output of the Tx audio filter section.
Input to the audio volume control.
Output of the CTCSS tone generator.
Output of the audio volume control.
©1999 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480199.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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