GPIO
Figure 40
provides the AC test load for the I
2
C.
Output
Z
0
= 50
Ω
OV
DD
/2
R
L
= 50
Ω
Figure 40. I
2
C AC Test Load
Figure 41
shows the AC timing diagram for the I
2
C bus.
SDA
t
I2DVKH
t
I2CL
SCL
t
I2SXKL
S
t
I2DXKL
t
I2CH
Sr
t
I2SVKH
t
I2PVKH
P
S
t
I2SXKL
t
I2KHKL
Figure 41. I
2
C Bus AC Timing Diagram
14 GPIO
This section describes the DC and AC electrical specifications for the GPIO interface of the MPC8572E.
14.1
GPIO DC Electrical Characteristics
Table 55. GPIO DC Electrical Characteristics (3.3 V DC)
Parameter
Supply voltage 3.3V
High-level input voltage
Low-level input voltage
Input current
(BV
IN 1
= 0 V or BV
IN
= BV
DD
)
High-level output voltage
(BV
DD
= min, I
OH
= –2 mA)
Low-level output voltage
(BV
DD
= min, I
OL
= 2 mA)
Symbol
BV
DD
V
IH
V
IL
I
IN
V
OH
V
OL
Min
3.13
2
–0.3
—
BV
DD
– 0.2
—
Max
3.47
BV
DD
+ 0.3
0.8
±5
—
0.2
Unit
V
V
V
μA
V
V
Table 55
provides the DC electrical characteristics for the GPIO interface operating at BV
DD
= 3.3 V DC.
Note:
1. Note that the symbol BV
IN
, in this case, represents the BV
IN
symbol referenced in
Table 1.
MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4
Freescale Semiconductor
69
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
