MAX3480A 查看數據表（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

PIN

NAME

FUNCTION

PINS ON THE NON-ISOLATED SIDE

1

VCC1

Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 2, 10, and 14.

2

VCC2

Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 1, 10, and 14.

3, 4

D1, D2

Boost-Voltage Generator Outputs. See Figures 1 and 2.

5, 12

GND1,

GND2

Logic-Side Ground Inputs. Must be connected; not internally connected.

6

FS

Frequency Switch Input. If FS = VCC, switch frequency is high; if FS = 0V, switch frequency is low

(normal connection).

7

SD

Power-Supply Shutdown Input. Must be connected to logic ground.

8

VCC3

Boosted V+ Voltage Input. Must be connected as shown in Figures 1 and 2.

9

DI

Driver Input. 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. Drives internal LED cathode through R1 (Table 1 of Figure 2).

10

VCC4

Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 1, 2, and 14.

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

11

DE

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. Drives

internal LED cathode through R2 (Table 1 of Figure 2).

13

RO

Receiver Output. If A > B by 200mV, RO will be low; if A < B by 200mV, RO will be high. Open collector;

must have pull-up (R3) to VCC (Table 1 of Figure 2).

14

VCC5

Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 1, 2, and 10.

_______________________________________________________________________________________ 7

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