MT88L85AN1 데이터 시트보기 (PDF) - Microsemi Corporation

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MT88L85AN1

3 V Integrated DTMF Transceiver with Power-Down and Adaptive Micro Interface

Microsemi Corporation 

MT88L85

Motorola

Intel

RS0

R/W

WR RD

FUNCTION

0

0

0

1 Write to Transmit

Data Register

0

1

1

0 Read from Receive

Data Register

1

0

0

1 Write to Control Register

1

1

1

0 Read from Status Register

Table 3 - Internal Register Functions

Data Sheet

b3

b2

b1

b0

RSEL

IRQ

CP/DTMF TOUT

Table 4 - CRA Bit Positions

b3

b2

b1

b0

C/R

S/D

RxEN

BURST

ENABLE

Table 5 - CRB Bit Positions

BIT NAME

DESCRIPTION

b0

TOUT Tone Output Control. A logic high enables the tone output; a logic low puts the DTMF

transmitter in power-down mode. The TONE output pin is held in high impedance and the

transmit register is cleared. See Note 1 below.

b1 CP/DTMF Call Progress or DTMF Mode Select. A logic high enables the receive call progress mode;

a logic low enables DTMF mode. In DTMF mode the device is capable of receiving and

transmitting DTMF signals. In CP mode a rectangular wave representation of the received

tone signal will be present on the IRQ/CP output pin if IRQ has been enabled (Control

Register A, b2=1). In order to be detected, CP signals must be within the bandwidth

specified in the AC Electrical Characteristics for Call Progress.

Note: DTMF signals cannot be detected when CP mode is selected.

b2

IRQ Interrupt Enable. A logic high enables the interrupt function; a logic low de-activates the

interrupt function. When IRQ is enabled and DTMF mode is selected (Control Register A,

b1=0), the IRQ/CP output pin will go low when either 1) a valid DTMF signal has been

received for a valid guard time duration, or 2) the transmitter is ready for more data (burst

mode only).

b3

RSEL Register Select. A logic high selects Control Register B for the next write cycle to the

control register address. After writing to Control Register B, the following control register

write cycle will be directed to Control Register A.

Table 6 - Control Register A Description

14

Zarlink Semiconductor Inc.

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