ST75C520 datasheet(4/45 Pages) STMICROELECTRONICS

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I.3 - Analog Interface

Name

Type

Description

TXA1

Transmit Analog Output 1

TXA2

Transmit Analog Output 2. Outputs TXA1 and TXA2 provide analog signals with maximum peak to peak

amplitude 2 x VREF, and must be followed by an external continous-time two pole smoothing filter (where

VREF =VREFP -VREFN).

RXA1

Receive Analog Input 1

RXA2

Receive Analog Input 2. The analog differential input peak to peak signal must be less than 2 x VREF.It

must be preceded by an external continous-time single pole anti-aliasing filter. This filter must be as

close as possible to the RXA1 and RXA2 Pins (where VREF =VREFP -VREFN).

VCM

I/O

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

VREFN

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

VREFP

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

I.4 - V.24 Interface

Pin Name

Type

Description

RTS

Request to Send. Active low.

CLK

Data Bit Clock. Falling edge coïncides with DATA change.

CTS

Clear to Send. Active low.

RxD

Receive Data

TxD

Transmit Data sampled with rising edge of CLK

Carrier Detect. Active low.

I.5 - Miscellaneous

Pin Name

Type

Description

XTAL

Internal Oscillator Output. Left open if not used.

EXTAL

Internal Oscillator Input, or External Clock

EYEX

Constellation X analog coordinate

EYEY

Constellation Y analog coordinate

TEST1

To be left open

TEST2

To be left open

Note : The nominal external clock frequency of the ST75C520 is 29.4912MHz with a precision better than

± 5.10-5

I.6 - Boundary Scan Interface

A set of 13 signals are dedicated for Testing the ST75C520 Component. These signals can be used in a

development phase, associated with the SGS-THOMSON ST18932 Boundary Scan Development Tools,

to Debug the application Hardware and Software. If not used all input signals must be grounded and all

output signals left open.

Pin Name

Type

Description

SCIN

Scan Data Input

SCCLK

Scan Clock

SCOUT

Scan Data Output

BOS

Begin of Scan Control

EOS

End of Scan

MC0..MC2

Mode Control

HALT

Stop ST75C520 Execution

MCI

Multicycle Instruction

RDYS

Ready to Scan Flag

EBS

Enable Boundary Scan. Active low (must be set low in normal mode).

CLKOUT

Internal ST75C520 Clock (XTAL frequency divided by 2)

ST75C520

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