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UG-400 Datasheet(PDF) 7 Page - Analog Devices |
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UG-400 Datasheet(HTML) 7 Page - Analog Devices |
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7 / 20 page  Hardware User Guide UG-400 Rev. 0 | Page 7 of 20 ISOLATED RS-232 The isolated RS-232 port is implemented using the ADM3252E signal and power isolated RS-232 transceiver. The ADM3252E con- nects to UART3 of the ADSP-BF548 and is capable of functioning at data rates of up to 460 kbit/sec. Figure 6 shows a circuit diagram of the implementation of the ADM3252E on the ezLINX hardware. When the JP2 jumper is fitted, it implements a loopback of the isolated RS-232 transmitter output (Pin TOUT1) to the receiver input (Pin RIN1). The VCC pins (Pin A2, Pin B1, and Pin B2) of the ADM3252E are powered with 3.3 V and generate an isolated 3.3 V on the VISO pins (Pin A10, Pin B10, and Pin C10) using Analog Devices isoPower technology. A 3-pin screw terminal connector, J6, is used for easy access to the TOUT1 (Pin 2 of J6), RIN1 (Pin 3 of J6), and RS232_ISO_GND (Pin 1 of J6) signals. The ADM3252E contains isoPower technology that uses high frequency switching elements to transfer power through the transformer. Special care must be taken during PCB layout to meet emissions standards. Refer to the AN-0971 Application Note, Recommendations for Control of Radiated Emissions with isoPower Devices, for details on board layout considerations. RS232_ISO_GND 3.3V GND GND RS232_ISO_GND RS232_ISO_3.3V RS232_ISO_GND RS232_ISO_GND 3.3V RS232_ISO_3.3V UART3TX UART3RX C142 0.1uF U44 ADM3252E NC1 A1 VCC B1 GND C1 TIN1 D1 GND E1 TIN2 F1 GND G1 ROUT1 H1 GND J1 ROUT2 K1 NC2 L1 VCC A2 VCC B2 GND C2 GND D2 GND E2 GND F2 GND G2 GND H2 GND J2 GND K2 GND L2 VISO A10 VISO B10 VISO C10 GNDISO D10 GNDISO E10 GNDISO F10 C2- G10 GNDISO H10 GNDISO J10 GNDISO K10 GNDISO L10 DNC1 A11 V+ B11 C1+ C11 TOUT1 D11 C1- E11 TOUT2 F11 C2+ G11 RIN1 H11 V- J11 RIN2 K11 DNC2 L11 C125 0.1uF C126 0.1uF C141 0.1uF C236 10uF C140 0.1uF C237 10uF + + JP2 JUMPER C130 0.1uF J6 Screw_3 1 2 3 Figure 6. ADM3252E Isolated RS-232 Implementation |
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Similar Description - UG-400 |
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