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ST75C530

SUPER INTEGRATED DEVICES WITH DSP, AFE & MEMORIES FORTELEPHONY, MODEM, FAX OVERINTERNET & POTS LINES

STMicroelectronics 

ST75C530 - ST75C540

II - PIN DESCRIPTION (continued)

II.2 - Host Interface

The exchanges with the control processor proceed through a 128 x 8 DUAL port RAM shared between the

ST75C530/540 and the Host. The signals associated with this interface are :

Pin Name Type

Description

SD0..SD7

I/O System Data Bus. 8-bit data bus used for asynchronous exchanges between the

ST75C530/540 and the Host through the dual port RAM. High impedance when exchanges

are not active.

SA0..SA6

I System Address Bus. 7-bit address bus for dual port RAM, IO and interrupt registers.

SDS (SRD)

I System Data Strobe. In Motorola mode SDS initiates the exchange, active low. In Intel mode

SRD initiates a read exchange, active low.

SR/W (SWR)

I

System Read/Write. In Motorola mode SR/W defines the type of exchange read/write. In Intel

mode SWR initiates a write exchange, active low.

SCS

I System Chip Select. Active low.

SINTR

OD System Interrupt Request. Open drain. Active low. This signal isasserted by the ST75C530/540

and negated by the host.

RESET

I Reset. Active low.

INT/MOT

I Select Intel or Motorola Interface

II.3 - Analog Interface

Pin Name

TxA1

TxA2

RxA

SPK1P

SPK1N

SPK2P

SPK2N

SPK3P

SPK3N

MIC1

MIC2

MIC3

VCM

VREFN

VREFP

Type

O

O

I

O

O

O

O

O

O

I

I

I

I/O

I

I

Description

Transmit Analog Output 1

Transmit Analog Output 2

Receive Analog Input

Speaker Output 1, (differential positive), must be connected through Amplifier to the

loudspeaker.

Speaker Output 1, (differential negative)

Speaker Output 2, (differential positive), must be connected through Amplifier to the Handset

loudspeaker.

Speaker Output 2, (differential negative)

Speaker Output 3, (differential positive)

Speaker Output 3, (differential negative)

Microphone Input 1

Microphone Input 2

Microphone Input 3

Analog Common Voltage (nominal +2.5V). This input must be decoupled with respect to AGND.

Analog Negative Reference (nominal 1.25V). This input must be decoupled with respect to

VCM.

Analog Positive Reference (nominal 3.75V). This input must be decoupled with respect to VCM.

II.4 - General Purpose IO and Relay

Pin Name

GIO[0,7]

GIO[10,17]

RELAY0,

RELAY1

RING

RGND

Type

I/O

I/O

OD

Description

General Purpose I/O Pins, can be independently selected as input or output.

General Purpose I/O Pins, can be independently selected as input or output.

Relay Outputs, Open Drain, Active Low. Can sink -10mA to RGND.

I

PWR

Ring detect signal. Active low. If the ST75C530/540 is in low power mode, a low level will awake

the chip. This input is a Schmidt’s trigger.

Relay Digital Ground. To connect to GND.

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