ST5080D datasheet(5/32 Pages) STMICROELECTRONICS

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PIN FUNCTIONS (continued)

Name

Description

Mode Select: This input selects COMBO I/II interface mode

with separate MICROWIRE Control interface when tied high

and GCI mode when tied low.

Transmit Data ouput: Data is shifted out on this pin during the

assigned transmit time slots. Elsewhere DX output is in the high

impendance state. In COMBO I/II mode, voice data byte is

shifted out from TRISTATE output DX at the MCLK frequency

on the rising edge of MCLK. In GCI mode, voice data byte and

control bytes are shifted out from OPEN-DRAIN output DX at

half the MCLK. An external pull up resistor is needed.

N.C.

No Connected.

Receive data input: Data is shifted in during the assigned

Received time slots. In the COMBO I/II mode, voice data byte

is shifted in at the MCLK frequency on the falling edges of

MCLK. In the GCI mode, PCM data byte and contol byte are

shifted in at half the MCLK frequency on the receive rising

edges of MCLK. There is one period delay between transmit

rising edge and receive rising edge of MCLK.

Frame Sync input: This signal is a 8kHz clock which defines

the start of the transmit and receive frames. Either of three

formats may be used for this signal: non delayed timing mode,

delayed timing and GCI compatible timing mode.

MCLK

Master Clock Input: This signal is used by the switched

capacitor filters and the encoder/decoder sequencing logic.

Values must be 512 kHz, 1.536 MHz, 2.048 MHz or 2.56 MHz

selected by means of Control Register CRO. MCLK is used

also to shift-in and out data. In GCI mode, 2.56 MHz and 512

kHz are not allowed.

Open drain output:

a logic 1 written into DO (CR1) appears at LO pin as a logic 0

a logic 0 written into DO puts LO pin in high impedance.

N.C.

No Connected.

MIC2+

Alternative positive high impedance input to transmit pre-

amplifier.

MIC1+

Positive high impedance input to transmit pre-amplifier for

microphone symetrical connection.

MIC1-

Negative high impedance input to transmit pre-amplifier for

microphone symetrical connection.

N.C.

No connected.

VCCA

Positive power supply input for the analog section.

+5 V + 10%. VCC and VCCA must be directly connected

t oget her.

MIC2-

Alternative negative high impedance input to transmit pre-

amplifier.

GNDA

Analog Ground: All analog signals are referenced to this pin.

GND and GNDA must be connected together close to the

device.

EAIN

External Auxiliary input: This input can be used to provide

alternate signals to the Loudspeaker in place of Internal Ring

generator. Input signal should be voice band limited.

ST5080A

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