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| 型号： | MPC8555VTAPFX |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 833 MHz, RISC PROCESSOR, PBGA783 |
| 封装： | 29 X 29 MM, 3.75 MM HEIGHT, 1 MM PITCH, LEAD FREE, FLIP CHIP, PLASTIC, BGA-783 |
| 文件页数： | 48/88页 |
| 文件大小： | 1244K |
| 代理商： | MPC8555VTAPFX |
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MPC8555E PowerQUICC III Integrated Communications Processor Hardware Specifications, Rev. 4
52
Freescale Semiconductor
I2C
12.2
I2C AC Electrical Specifications
Table 40. I2C AC Electrical Specifications
Parameter
Symbol 1
Min
Max
Unit
SCL clock frequency
fI2C
0
400
kHz
Low period of the SCL clock
tI2CL
6
1.3
—
μs
High period of the SCL clock
tI2CH
6
0.6
—
μs
Setup time for a repeated START condition
tI2SVKH
6
0.6
—
μs
Hold time (repeated) START condition (after this period, the first clock
pulse is generated)
tI2SXKL
6
0.6
—
μs
Data setup time
tI2DVKH
6
100
—
ns
Data hold time:
CBUS compatible masters
I2C bus devices
tI2DXKL
—
0 2
—
0.9 3
μs
Rise time of both SDA and SCL signals
tI2CR
20 + 0.1 Cb
4
300
ns
Fall time of both SDA and SCL signals
tI2CF
20 + 0.1 Cb
4
300
ns
Set-up time for STOP condition
tI2PVKH
0.6
—
μs
Bus free time between a STOP and START condition
tI2KHDX
1.3
—
μs
Noise margin at the LOW level for each connected device (including
hysteresis)
VNL
0.1
× OV
DD
—V
Noise margin at the HIGH level for each connected device (including
hysteresis)
VNH
0.2
× OV
DD
—V
Notes:
1. The symbols used for timing specifications herein 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, tI2DVKH symbolizes I
2C timing
(I2) with respect to the time data input signals (D) reach the valid state (V) relative to the tI2C clock reference (K) going to the
high (H) state or setup time. Also, tI2SXKL symbolizes I
2C timing (I2) for the time that the data with respect to the start
condition (S) went invalid (X) relative to the tI2C clock reference (K) going to the low (L) state or hold time. Also, tI2PVKH
symbolizes I2C timing (I2) for the time that the data with respect to the stop condition (P) reaching the valid state (V) relative
to the tI2C 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.
MPC8555E provides a hold time of at least 300 ns for the SDA signal (referred to the VIHmin of the SCL signal) to bridge the
undefined region of the falling edge of SCL.
3. The maximum tI2DVKH has only to be met if the device does not stretch the LOW period (tI2CL) of the SCL signal.
4. CB = capacitance of one bus line in pF.
5. Guaranteed by design.
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