Electronic Component Distributor. Source::Freescale Semiconductor
P.N:MPC8349CZUAGDB Desc:IC MPU POWERQUICC II PRO 672TBGA
Web:http://www.hotenda.cn E-mail:[email protected] Phone:(+86) 075583794354
MPC8349EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 13
46
Freescale Semiconductor
I
2
C
Figure 32
provides the AC test load for the I
2
C.
Figure 32. I
2
C AC Test Load
Figure 33
shows the AC timing diagram for the I
2
C bus.
Figure 33. I
2
C Bus AC Timing Diagram
Fall time of both SDA and SCL signals
5
t
I2CF
__
300
ns
Setup time for STOP condition
t
I2PVKH
0.6
—
μ
s
Bus free time between a STOP and START condition
t
I2KHDX
1.3
—
μ
s
Noise margin at the LOW level for each connected device (including
hysteresis)
V
NL
0.1
×
OV
DD
—
V
Noise margin at the HIGH level for each connected device (including
hysteresis)
V
NH
0.2
×
OV
DD
—
V
Notes:
1. The symbols for timing specifications follow the pattern of t
(first two letters of functional block)(signal)(state)(reference)(state)
for inputs
and t
(first two letters of functional block)(reference)(state)(signal)(state)
for outputs. For example, t
I2DVKH
symbolizes I
2
C timing (I2) with
respect to the time data input signals (D) reach the valid state (V) relative to the t
I2C
clock reference (K) going to the high (H)
state or setup time. Also, t
I2SXKL
symbolizes I
2
C timing (I2) for the time that the data with respect to the start condition (S)
goes invalid (X) relative to the t
I2C
clock reference (K) going to the low (L) state or hold time. Also, t
I2PVKH
symbolizes I
2
C
timing (I2) for the time that the data with respect to the stop condition (P) reaches the valid state (V) relative to the t
I2C
clock
reference (K) going to the high (H) state or setup time. For rise and fall times, the latter convention is used with the appropriate
letter: R (rise) or F (fall).
2. The device provides a hold time of at least 300 ns for the SDA signal (referred to the V
IH
(min) of the SCL signal) to bridge
the undefined region of the falling edge of SCL.
3. The maximum t
I2DVKH
must be met only if the device does not stretch the LOW period (t
I2CL
) of the SCL signal.
4. C
B
= capacitance of one bus line in pF.
5.)The device does not follow the “I
2
C-BUS Specifications” version 2.1 regarding the t
I2CF
AC parameter.
Table 43. I
2
C AC Electrical Specifications (continued)
Parameter
Symbol
1
Min
Max
Unit
Output
Z
0
= 50
Ω
OV
DD
/2
R
L
= 50
Ω
Sr
S
SDA
SCL
t
I2CF
t
I2SXKL
t
I2CL
t
I2CH
t
I2DXKL
t
I2DVKH
t
I2SXKL
t
I2SVKH
t
I2KHKL
t
I2PVKH
t
I2CR
t
I2CF
P
S
46 / 87