MT88E45BSR Просмотр технического описания (PDF) - Zarlink Semiconductor Inc

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MT88E45BSR

4-Wire Calling Number Identification Circuit 2 (4-Wire CNIC2)

Zarlink Semiconductor Inc 

MT88E45

Data Sheet

CB0 CB1 CB2

FSK

Interface

Function

0/1 1 1 Set by CB0 FSK Demodulation. Tip/Ring input (GS1) selected. DR/STD is DR.

0/1 1 0 Set by CB0 Hybrid CAS Detection. Hybrid Receive input (GS2) selected. DR/STD is STD.

0/1 0

1 Set by CB0 Tip/Ring CAS Detection. Tip/Ring input (GS1) selected. DR/STD is STD.

When the line is off-hook, a Bellcore/TIA 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.

1 0 0 Mode 1 Power Down. The MT88E45B is disabled and draws virtually no power supply

current.

0 0 0 Mode 0 Reserved for factory testing.

Table 1 - CB0/1/2 Functionality

The number of control bits (CB) required to interface the MT88E45B with the microcontroller depends on the

functionality of the application, as shown in Table 2.

Functionality Group

Controls

Description

FSK (mode 0 or 1) and

Hybrid CAS only

(Non MEI compatible)

CB2 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.

FSK (mode 0 or 1),

Hybrid CAS,

Tip/Ring CAS

(MEI compatible or BT on-hook CLIP)

CB1 CB0 is hardwired to Vdd or Vss to select the FSK

CB2 interface.

The microcontroller uses CB1 and CB2 to select between

the 3 functions.

FSK (mode 1),

Hybrid CAS,

Tip/Ring CAS,

Power Down

(MEI compatible or BT on-hook CLIP)

CB1 CB0 is hardwired to Vdd to select FSK interface mode 1.

CB2 The microcontroller uses CB1 and CB2 to select between

the 4 functions.

FSK (mode 0), Hybrid CAS,

Tip/Ring CAS, Power Down

(MEI compatible or BT on-hook CLIP)

CB0 All 3 pins are required.

CB1

CB2

Table 2 - Control Bit Functionality Groups

Functional Overview

The MT88E45B 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’.

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 terminal. Additionally in off-hook signalling, the special dual tone CAS is used

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Zarlink Semiconductor Inc.

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