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WA_DEV_FEX20_PTS_004 Rev 001 June 30, 2010 22

Expansion Card Product Technical

Specification

Interfaces

4.2. Electrical Information for Digital I/O

There are three types of digital I/Os on the Expansion Card:

 2.8 volt CMOS

 1.8 volt CMOS

 Open drain

Refer to the tables below for the electrical characteristics of these digital I/Os.

Table 7: Electrical Characteristics of a 2.8 volt Type Digital I/O

Parameter

I/O Type

Minimum

Typical

Maximum

Condition

Internal 2.8V power supply

VCC_2V8

2.74V

2.8V

2.86V

Input/Output

CMOS

-0.5V*

0.84V

CMOS

1.96V

3.2V*

CMOS

0.4V

= - 4 mA

CMOS

2.4V

= 4 mA

4mA

- 4mA

* Absolute maximum ratings

All 2.8V I/O pins do not accept input signal voltages above the maximum voltage specified above.

Table 8: Electrical Characteristics of a 1.8 volt Type Digital I/O

Parameter

I/O Type

Minimum

Typical

Maximum

Condition

Internal 1.8V power supply

VCC_1V8

1.76V

1.8V

1.94V

Input/Output

CMOS

-0.5V*

0.54V

CMOS

1.33V

2.2V*

CMOS

0.4V

= - 4 mA

CMOS

1.4V

= 4 mA

4mA

- 4mA

* Absolute maximum ratings

Table 9: Open Drain Output Type

Signal Name

Parameter

I/O Type

Minimum

Typical

Maximum

Condition

SDA/GPIO27

and

SCL/GPIO26

TOL

Open Drain

3.3V

Tolerated voltage

Open Drain

0.8V

Open Drain

0.4V

Open Drain

3mA

The reset states of the I/Os are given in each interface description chapter. Definitions of these states

are given in the table below.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 59 60

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