ST7537HS1 Datasheet, PDF (1/9 Pages) STMicroelectronics – HOME AUTOMATION MODEM

ST7537HS1
. HALF DUPLEX ASYNCHRONOUS 2400bps
FSK MODEM
. Tx CARRIER FREQUENCY SYNTHESIZED
FROM EXTERNAL CRYSTAL
. _{LOW DISTORTION Tx SIGNAL}
. _{Rx SENSITIVITY BETTER THAN 1mVRMS}
. _{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,
1mVRMS TYPICALLY)
HOME AUTOMATION MODEM
PLCC28
(Plastic Chip Carrier)
ORDER CODE : ST7537HS1
PIN CONNECTIONS
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
TxIFI 5
PAFB 6
ATO 7
PABC 8
PABC 9
TEST1 10
TEST2 11
25
DV_CC
24 RSTO
23 RxD
22 TxD
21 CD
20 Rx/Tx
19 WD
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