US Robotics USR3500 Especificaciones descargar pdf (Pagina 17)

Rev 1.0 1/27/14 17

Reference Guide

Interfaces

Refer to the following table for the pin description of the GPIOs.

Table 3. GPIO Pin Description

Pin #

Signal

I/O

I/O Voltage

Description

GPIO25/INT 1

I/O

Vref

General purpose input/output or Interrupt

GPIO35

I/O

Vref

General purpose input/output

Vref

2.8V ~ 15V

Voltage reference for the GPIOs

Note: It is recommended to use a 6-wire cable accessory for easy access to these three lines. Please

refer to the Getting Started Guide at http://www.usr.com/support/3500 for more information about

the 6-wire cable accessory.

When the voltage reference, Vref, is not connected, if one of the GPIO output is in High state while

the other is in Low state, the GPIO in high level voltage will be at 2.3V.To avoid this voltage drop, it

is recommended to use Vref to the desired output voltage.

With Vref connected to 2.8V, both GPIO35 and GPIO25 may be interfaced with a

component that complies with the following levels.

Table 4. GPIO Pin Operating Conditions when Vref is at 2.8V

Parameter

Mininum

Typical

Maximum

Condition

0.84V

Please refer to Figure 6.

1.96V

Please refer to Figure 7.

0.4*

Please refer to Figure 8.

2.8*

modem Zout = 100K Pull-up to Vref, please

refer to Figure 9.

* Value without external load.

Figure 6. Equivalent Circuit of V

, Vref = 2.8V

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 62 63

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