MAX3480A データシートの表示（PDF） - Maxim Integrated

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MAX3480A

Complete, Isolated, 3.3V RS-485/RS-422 Data Interface

Maxim Integrated 

Complete, Isolated, 3.3V

RS-485/RS-422 Data Interface

_________________________________________________Pin Description (continued)

PIN

NAME

PINS ON THE ISOLATED RS-485/RS-422 SIDE

FUNCTION

15

ISO RO

LED

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.

16

ISO COM2 Isolated-Supply Common Input. Connect to ISO COM1.

Isolated Driver-Enable Drive Input. The driver outputs, A and B, are enabled by bringing DE´ high.

17

ISO DE

DRV

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).

18

ISO VCC2 Isolated-Supply Positive Input Voltage. Connect to ISO VCC1.

Isolated Driver-Input Drive. With DE´ high, a low on DI´ forces output A low and output B high. Similarly,

19

ISO DI DRV 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).

20

ISO COM1

Isolated-Supply Common Output. Connect to ISO COM2. If RS-485 wires have a shield, connect ISO

COM1 to shield via 100Ω resistor.

21

ISO DE IN Isolated Driver-Enable Input. Connect to ISO DE DRV for normal operation.

22

ISO DI IN Isolated Driver Input. Connect to ISO DI DRV for normal operation.

23

A

Noninverting Driver Output and Noninverting Receiver Input.

24

ISO RO

DRV

Isolated Receiver-Output Drive. Connect to ISO RO LED through R6 (Table 1 of Figure 2).

25

B

Inverting Driver Output and Inverting Receiver Input

26

27, 28

ISO VCC1

AC2, AC1

Isolated Supply Positive Output Voltage. Connect to ISO VCC2.

Internal Connections. Leave these pins unconnected.

Note: For DE´ and DI´ pin descriptions, see Detailed Block Diagram and Typical Application Circuit.

8 _______________________________________________________________________________________

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