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ST7537HS1

HOME AUTOMATION MODEM

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HALF DUPLEX ASYNCHRONOUS 2400bps

FSK MODEM

Tx CARRIER FREQUENCY SYNTHESIZED

FROM EXTERNAL CRYSTAL

LOW DISTORTION Tx SIGNAL

Rx SENSITIVITY BETTER THAN 1mV

RMS

CARRIER DETECTION

WATCH-DOG INPUT

RESET AND MASTER CLOCK OUTPUTS

FOR MICROCONTROLLER

POWER AMPLIFIER BIAS CURRENT CON-

TROL (HIGH IMPEDANCE IN Rx MODE)

SIMPLE AND ECONOMICAL APPLICATION

SCHEMATICS

COMPATIBLE WITH CENELEC EN 50065-1

AND FCC SPECIFICATION

CARRIER DETECT CLAMPING ON RxD

PROGRAMMABLE (ALLOWING DEMODULA-

TION ON VERY LOW RECEIVE LEVEL,

1mV

RMS

TYPICALLY)

PLCC28

(Plastic Chip Carrier)

ORDER CODE :

ST7537HS1

PIN CONNECTIONS

RxFO

AV

DD

V

CM

RAI

DEMI

SS

4

3

2

1

28

27

26

25

24

TxIFI

5

6

7

IFO

AV

DV

CC

DESCRIPTION

The ST7537HS1 is a half duplex asynchronous

FSK MODEM designed for home automation com-

munication on the domestic electric mains which

complies with the EN 50065-1 CENELEC stand-

ard.

It mainly operates from a 10V power supply and a

5V power supply for the microcontroller digital in-

terface.

It is interfaced to the power line by an external

driver, and a transformer (see Application Sche-

matic Diagram). Its data transmission rate is

2400 bps and its carrier frequency is 132.45kHz.

June 1995

PAFB

ATO

PABC

RSTO

RxD

TxD

23

22

21

20

19

13

15

16

12

14

17

18

8

9

10

11

PABC

TEST1

TEST2

CD

Rx/Tx

WD

TEST3

TEST4

XTAL1

DV

DD

XTAL2

MCLK

SS

1/9

7537H-01.EPS

DV

next

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