Telephone Signalling Transceiver / Least Cost Router
CMX860
CMX860
Signal
Description
D6, D1, E1
Pin No.
Name
Type
HD
I/P
22
Schmitt trigger input to the Hook signal detector.
Connect to DVSS if Hook Detector not used.
The 'C-BUS' chip select input from the mC.
CSN
I/P
I/P
23
24
COMMAND
DATA
The 'C-BUS' serial data input from the mC.
SERIAL
CLOCK
I/P
25
26
The 'C-BUS' serial clock input from the mC.
REPLY DATA
T/S
A 3-state 'C-BUS' serial data output to the mC.
This output is high impedance when not sending
data to the mC.
IRQN
O/P
27
28
A ‘wire-ORable’ output for connection to a mC
Interrupt Request input. This output is pulled
down to DVSS when active and is high impedance
when inactive. An external pullup resistor is
required i.e. R1 of Figure 2.
DVDD
Power The digital positive supply rail. Levels and
thresholds within the device are proportional to
this voltage.
I/P = Input O/P = Output BI = Bidirectional T/S = 3-state Output NC = No Connection
ã 2002 Consumer Microcircuits Limited
7
D/860/5
CMLMICRO [ CML MICROCIRCUITS ]
