CMX865D2 CML Microcircuits, CMX865D2 Datasheet - Page 4

• Manufacturer Part Number: CMX865D2
• Description: FSK Modem and DTMF Codec
• Manufacturer: CML Microcircuits

FSK Modem and DTMF Codec
3.
© 2005 CML Microsystems Plc
4, 8, 12, 17, 21
CMX865D2
7, 16, 24
Pin No.
Signal List
10
11
13
14
15
18
19
20
22
23
1
2
3
5
6
9
XTAL/CLOCK
REPLY DATA
COMMAND
RDRVN
SERIAL
CLOCK
RXAFB
XTALN
RXAN
Name
TXAN
DATA
V
IRQN
RXA
CSN
TXA
V
V
RD
RT
BIAS
DD
SS
Signal
Power
Power
Type
O/P
O/P
O/P
O/P
O/P
O/P
O/P
T/S
I/P
I/P
I/P
I/P
I/P
I/P
I/P
BI
The output of the on-chip Xtal oscillator inverter.
The input to the oscillator inverter from the Xtal
circuit or external clock source.
Relay drive output, low resistance pull down to
V
to V
The negative supply rail (ground).
Schmitt trigger input to the Ring signal detector.
Connect to V
Open drain output and Schmitt trigger input
forming part of the Ring signal detector. Connect
to V
The positive supply rail. Levels and thresholds
within the device are proportional to this voltage.
The output of the Rx Input Amplifier.
The inverting input to the Rx Input Amplifier
The non-inverting input to the Rx Input Amplifier
Internally
approximately V
in ‘Powersave’ mode when V
to V
capacitor mounted close to the device pins.
The inverted output of the Tx Output Buffer.
The non-inverted output of the Tx Output Buffer.
The C-BUS chip select input from the µC.
The C-BUS serial data input from the µC.
The C-BUS serial clock input from the µC.
A 3-state C-BUS serial data output to the µC.
This output is high impedance when not sending
data to the µC.
A ‘wire-ORable’ output for connection to a µC
Interrupt Request input. This output is pulled
down to V
when inactive. An external pullup resistor is
required i.e. R1 of Figure 2.
SS
4
DD
DD
when active and medium resistance pull up
SS
when inactive.
if Ring Detector not used.
. Should be decoupled to V
SS
SS
generated
when active and is high impedance
if Ring Detector not used.
DD
Description
/2, except when the device is
bias
BIAS
will discharge
voltage
SS
by a
of
CMX865
D/865/3