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MAX3480BCPI Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX3480BCPI Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 16 page Complete, Isolated, 3.3V RS-485/RS-422 Data Interface 8 _______________________________________________________________________________________ Note: For DE ´ and DI´ pin descriptions, see Detailed Block Diagram and Typical Application Circuit. _________________________________________________Pin Description (continued) Isolated Driver-Enable Drive Input. The driver outputs, A and B, are enabled by bringing DE ´ high. The driver outputs are high impedance when DE ´ is low. If the driver outputs are enabled, the device functions as a line driver. While the driver outputs are high impedance, the device functions as a line receiver. Open collector output; must have pull-up (R4) to ISO VCC and be connected to ISO DE IN for normal operation (Table 1 of Figure 2). ISO DE DRV 17 ISO RO LED 15 Isolated-Supply Common Input. Connect to ISO COM1. ISO COM2 16 PIN FUNCTION NAME Isolated-Supply Positive Input Voltage. Connect to ISO VCC1. ISO VCC2 18 Isolated Driver-Input Drive. With DE ´ high, a low on DI´ forces output A low and output B high. Similarly, a high on DI ´ forces output A high and output B low. Open-collector output; must have pull-up (R5) to ISO VCC and be connected to ISO DI IN for normal operation (Table 1 of Figure 2). ISO DI DRV 19 Isolated-Supply Common Output. Connect to ISO COM2. If RS-485 wires have a shield, connect ISO COM1 to shield via 100 Ω resistor. ISO COM1 20 Isolated Receiver-Output LED Anode (input). If A > B by 200mV, ISO RO LED will be high; if A < B by 200mV, ISO RO LED will be low. Isolated Driver-Enable Input. Connect to ISO DE DRV for normal operation. ISO DE IN 21 Noninverting Driver Output and Noninverting Receiver Input. A 23 Inverting Driver Output and Inverting Receiver Input B 25 Isolated Driver Input. Connect to ISO DI DRV for normal operation. ISO DI IN 22 Isolated Receiver-Output Drive. Connect to ISO RO LED through R6 (Table 1 of Figure 2). ISO RO DRV 24 Isolated Supply Positive Output Voltage. Connect to ISO VCC2. ISO VCC1 26 Internal Connections. Leave these pins unconnected. AC2, AC1 27, 28 PINS ON THE ISOLATED RS-485/RS-422 SIDE |
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