CMX602B
Calling Line Identifier
plus
Call Waiting (Type II)
D/602B/1 August 1999
Provisional Issue
Features
•
CLI and CIDCW System Operation
•
Low Power Operation 0.5mA at 2.7V
•
Zero-Power Ring or Line Reversal
Detector
•
FSK Demodulator with Data Retiming
•
High Sensitivity CAS Tone Detection
•
Low CAS Tone Falsing in CIDCW Mode
Applications
•
CLI and CIDCW Adjunct Boxes
•
CLI and CIDCW Feature Phones
•
Bellcore, ETSI, British Telecom and
Mercury Systems
•
Computer Telephone Integration
•
Call Logging Systems
•
Voice-Mail Equipment
1.1
Brief Description
The CMX602B is a low power CMOS integrated circuit for the reception of the physical layer signals used in
BT's Calling Line Identification Service (CLIP), Bellcore's Calling Identity Delivery System (CID), the Cable
Communications Association's Caller Display Services (CDS), and similar evolving systems. It also meets the
requirements of emerging Caller Identity with Call Waiting services (CIDCW).
The device includes a 'zero-power' ring or line reversal detector, a dual-tone (2130Hz plus 2750Hz) Tone Alert
Signal and a 1200-baud FSK V23/Bell202 compatible asynchronous data demodulator with a data retiming
circuit which removes the need for a UART in the associated µController.
It is suitable for use in systems to BT specifications SIN227 and SIN242, Bellcore GR-30-CORE and SR-TSV-
002476, CCA TW/P&E/312, ETSI ETS 300 659 parts 1 and 2, ETS 300 778 parts 1 and 2 and Mercury
Communications MNR 19.
©
1999
Consumer Microcircuits Limited
Calling Line Identifier
CMX602B
CONTENTS
Section
Page
1.1 Brief Description.........................................................................................1
1.2 Block Diagram ............................................................................................3
1.3 Signal List ...................................................................................................4
1.4 External Components.................................................................................6
1.5 General Description....................................................................................7
1.5.1 Mode Control Logic
....................................................................7
1.5.2 Input Signal Amplifier
.................................................................7
1.5.3 Bandpass Filter
...........................................................................8
1.5.4 Level Detector
.............................................................................8
1.5.5 FSK Demodulator........................................................................9
1.5.6 FSK Data Retiming......................................................................9
1.5.7 Tone Alert Detector
...................................................................10
1.5.8 Ring or Line Polarity Reversal Detector
..................................11
1.5.9 Xtal Osc and Clock Dividers.....................................................13
1.6 Application Notes .....................................................................................14
1.6.1 'On-Hook' Operation
.................................................................14
1.6.2 'Off-Hook' Operation
.................................................................17
1.7 Performance Specification.......................................................................19
1.7.1 Electrical Performance..............................................................19
1.7.2 Packaging..................................................................................23
©
1999
Consumer Microcircuits Limited
2
D/602B/1
Calling Line Identifier
CMX602B
1.2
Block Diagram
Figure 1 Block Diagram
©
1999
Consumer Microcircuits Limited
3
D/602B/1
Calling Line Identifier
CMX602B
1.3
Signal List
Packages
D4/P3/E4
Pin No.
1
2
3
Name
XTALN
XTAL
RD
Signal
Description
Type
O/P
I/P
I/P (S)
The output of the on-chip Xtal oscillator inverter.
The input to the on-chip Xtal oscillator inverter.
Input to the Ring or Line Polarity Reversal
Detector.
Open-drain output and Schmitt trigger input
forming part of the Ring or Line Polarity
Reversal detector. An external resistor to V
DD
and a capacitor to V
SS
should be connected to
RT to filter and extend the RD input signal.
The output of the on-chip Input Signal Amplifier
and the input to the Bandpass Filter.
The inverting input to the on-chip Input Signal
Amplifier.
The non-inverting input to the on-chip Input
Signal Amplifier.
Negative supply rail (signal ground).
Internally generated bias voltage, held at V
DD
/2
when the device is not in 'Zero-Power' mode.
Should be decoupled to V
SS
by a capacitor
mounted close to the device pins.
Input used to select the operating mode. See
section 1.5.1.
A high level on this input selects 'Zero-Power'
mode, a low level enables the V
BIAS
supply, the
Input Signal Amplifier, the Bandpass Filter and
either the FSK or the Tone Alert circuits
depending on the MODE input.
4
RT
BI
5
AOP
BI
6
INV
I/P
7
NINV
I/P
8
9
V
SS
V
BIAS
Power
O/P
10
MODE
I/P (S)
11
ZP
I/P (S)
©
1999
Consumer Microcircuits Limited
4
D/602B/1
Calling Line Identifier
CMX602B
Packages
D4/P3/E4
Pin No.
12
Signal
Description
Name
IRQN
Type
O/P
An open-drain active low output that may be
used as an Interrupt Request / Wake-up input to
the associated µC. An external pull-up resistor
should be connected between this output and
V
DD
.
A logic level output driven by the Ring or Line
Polarity Reversal Detector, the Tone Alert
Detector or the FSK Level detect circuits,
depending on the operating mode. See section
1.5.1.
An input which may be used to clock received
data bits out of the FSK Data Retiming block.
A logic level output carrying either the raw
output of the FSK Demodulator or re-timed 8-bit
characters depending on the state of the RXCK
input. See section 1.5.6
The positive supply rail. Levels and thresholds
within the device are proportional to this voltage.
Should be decoupled to VSS by a capacitor
mounted close to the device pins.
13
DET
O/P
14
15
RXCK
RXD
I/P (S)
O/P
16
V
DD
Power
Notes:
I/P
I/P (S)
O/P
BI
=
=
=
=
Input
Schmitt trigger input
Output
Bidirectional
©
1999
Consumer Microcircuits Limited
5
D/602B/1
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