ST7537HS1

ST7537HS1 HOME AUTOMATION MODEM . . . . . . . . . . . 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 CONTROL (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 DEMODULATION ON VERY LOW RECEIVE LEVEL, 1mVRMS TYPICALLY) PLCC28 (Plastic Chip Carrier) ORDER CODE : ST7537HS1 PIN CONNECTIONS RxFO AV DD VCM RAI DEMI SS 4 3 2 1 28 27 26 25 24 TxIFI 5 6 7 IFO AV DVCC DESCRIPTION The ST7537HS1 is a half duplex asynchronous FSK MODEM designed for home automation communication on the domestic electric mains which complies with the EN 50065-1 CENELEC standard. It mainly operates from a 10V power supply and a 5V power supply for the microcontroller digital interface. It is interfaced to the power line by an external driver, and a transformer (see Application Schematic 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 ST7537HS1 PIN DESCRIPTION Pin Name VCM AVDD RAI RxFO TxIFI PAFB ATO PABC PABC T...