MT88E45BN1 Zarlink, MT88E45BN1 Datasheet - Page 5

• Manufacturer Part Number: MT88E45BN1
• Description: Caller ID CMOS 3.58MHz 3.3V 20-Pin SSOP Tube
• Manufacturer: Zarlink

Specifications of MT88E45BN1

• Package: 20SSOP
• Telecommunication Standards Supported: ANSI/TIA/EIA-716|ETSI/ETS 300 778-1|GR-30|SIN227|SIN242|SR-TSV-002476|TIA/EIA-777
• Fabrication Technology: CMOS
• Maximum Data Rate: 1212 Bd
• Typical Operating Supply Voltage: 3.3 V
• Typical Supply Current: 2.8 mA
• Minimum Operating Temperature: -40 °C
• Maximum Operating Temperature: 85 °C
• Operating Frequency: 3.58 MHz

MT88E45
The number of control bits (CB) required to interface the MT88E45 with the microcontroller depends on the
functionality of the application, as shown in Table 2.
Functional Overview
The MT88E45 is compatible with FSK and FSK plus
CAS (CPE Alerting Signal) based Caller ID services
around the world. Caller ID is the generic name for a
group of services offered by telephone operating
companies whereby information about the calling
party is delivered to the subscriber. In Europe and
some other countries Caller ID is known as Calling
Line Identity Presentation (CLIP). ETSI calls CAS
‘Dual Tone Alerting Signal’ (DT-AS), BT calls it ‘Tone
Alert Signal’.
4
CB0 CB1 CB2
FSK (mode 0 or 1) and
Hybrid CAS only
(Non MEI compatible)
FSK (mode 0 or 1),
Hybrid CAS,
Tip/Ring CAS
(MEI compatible or BT on-hook CLIP)
FSK (mode 1),
Hybrid CAS,
Tip/Ring CAS,
Power Down
(MEI compatible or BT on-hook CLIP)
FSK (mode 0), Hybrid CAS,
Tip/Ring CAS, Power Down
(MEI compatible or BT on-hook CLIP)
0/1
0/1
0/1
1
0
1
1
0
0
0
Functionality Group
1
0
1
0
0
Set by CB0 FSK Demodulation. Tip/Ring input (GS1) selected. DR/STD is DR.
Set by CB0 Hybrid CAS Detection. Hybrid Receive input (GS2) selected. DR/STD is STD.
Set by CB0 Tip/Ring CAS Detection. Tip/Ring input (GS1) selected. DR/STD is STD.
Interface
Mode 1
Mode 0
FSK
When the line is off-hook, a Bellcore Multiple Extension Interworking (MEI)
compatible Type 2 CPE should be able to detect CAS from Tip/Ring while the
CPE is on-hook because it may be the ACK sender. Tip/Ring CAS detection is
also required for BT’s on-hook CLIP.
Power Down. The MT88E45 is disabled and draws virtually no power supply
current.
Reserved for factory testing.
Table 2 - Control Bit Functionality Groups
Table 1 - CB0/1/2 Functionality
Control
CB2
CB1
CB2
CB1
CB2
CB0
CB1
CB2
s
CB0 is hardwired to Vdd or Vss to select the FSK
interface.
CB1 hardwired to Vdd.
The microcontroller uses CB2 to select between the 2
functions.
CB0 is hardwired to Vdd or Vss to select the FSK
interface.
The microcontroller uses CB1 and CB2 to select between
the 3 functions.
CB0 is hardwired to Vdd to select FSK interface mode 1.
The microcontroller uses CB1 and CB2 to select between
the 4 functions.
All 3 pins are required.
Depending on the service, data delivery can occur
when the line is in the on-hook or off-hook state. In
most countries the data is modulated in either Bell
202 or CCITT V.23 FSK format and transmitted at
1200 baud from the serving end office to the
subscriber’s
signalling, the special dual tone CAS is used to alert
the terminal before FSK data transmission. BT uses
CAS to alert the terminal prior to FSK in both on-
hook
signalling.
(Idle
Function
State)
terminal.
Description
and
Advance Information
Additionally
off-hook
(Loop
in
off-hook
State)