Specifications

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
pin
V
IL
CMOS
-0.5V*
0.84V
V
IH
CMOS
1.96V
3.2V*
V
OL
CMOS
0.4V
I
OL
= - 4 mA
V
OH
CMOS
2.4V
I
OH
= 4 mA
I
OH
4mA
I
OL
- 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
pin
V
IL
CMOS
-0.5V*
0.54V
V
IH
CMOS
1.33V
2.2V*
V
OL
CMOS
0.4V
I
OL
= - 4 mA
V
OH
CMOS
1.4V
I
OH
= 4 mA
I
OH
4mA
I
OL
- 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
V
TOL
Open Drain
3.3V
Tolerated voltage
V
IH
Open Drain
2V
V
IL
Open Drain
0.8V
V
OL
Open Drain
0.4V
I
OL
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.