Part Number
Interface
Shape
Notes
User LED (yellow)
Surface mounted LCD
User switch
Tact Switch h=17mm
Boot mode jumper
2 pin (2.54mm pitch)
User jumper
2 pin (2.54mm pitch)
5.2. Electrical Specifications
The electrical specifications of the input/output interfaces are shown in 製 製 5.4. Input/Output Interface Electrical
Specifications 製 . With the Software Pad Control (SW_PAD_CTL) and Drive Voltage Select Group Control
(SW_PAD_CTL_GRP_DVS) registers in i.MX257 it is possible to alter the output current (Std, High, Max), slew rate
(Slow, Fast), and pull-up/pull-down.
5.3 Input/Output Interface Rated Absolute Maximum
Symbol
Parameter
Min
Max
Units
VImax
Input voltage range
–0.5
OVDD+0.3
V
5.4 Input/Output Interface Electrical Specifications
Symbol
Parameter
Min
Max
Units
Conditions
VIH
CMOS High-Level Input
Voltage
0.7 x OVDD
OVDD
V
OVDD = +3.3V
VIL
CMOS Low-Level Input
Voltage
-0.3
0.3 x OVDD
V
OVDD = +3.3V
VOH
CMOS High-Level Output
Voltage
OVDD-0.15
V
IOH = -1mA
0.8 x OVDD
V
IOH = Specified
Drive
VOL
CMOS Low-Level Output
Voltage
0.15
V
IOL = 1mA
0.2 x OVDD
V
IOL = Specified Drive
IOH_S
High-Level Output Current,
Slow Slew Rate
-2.0
mA
VOH = 0.8 x OVDD,
Std Drive
-4.0
mA
VOH = 0.8 x OVDD,
High Drive
-8.0
mA
VOH = 0.8 x OVDD,
Max Drive
IOH_F
High-Level Output Current,
Fast Slew Rate
-4.0
mA
VOH = 0.8 x OVDD,
Std Drive
-6.0
mA
VOH = 0.8 x OVDD,
High Drive
-8.0
mA
VOH = 0.8 x OVDD,
Max Drive
IOL_S
Low-Level Output Current,
Slow Slew Rate
2.0
mA
VOL = 0.2 x OVDD,
Std Drive
4.0
mA
VOL = 0.2 x OVDD,
High Drive
8.0
mA
VOL = 0.2 x OVDD,
Max Drive
Armadillo-400 Series Hardware Manual
Interface Specifications
17
