參數(shù)資料
型號: 56F8014
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: 16-bit Digital Signal Controllers
中文描述: 16位數(shù)字信號控制器
文件頁數(shù): 107/124頁
文件大?。?/td> 1878K
代理商: 56F8014
Inter-Integrated Circuit Interface (I2C) Timing
56F8014 Technical Data, Rev. 3
Freescale Semiconductor
Preliminary
107
10.12 Inter-Integrated Circuit Interface (I
2
C) Timing
Table 10-17 I
2
C Timing
Characteristic
Symbol
Standard Mode
Fast Mode
Unit
Minimum
Maximum
Minimum
Maximum
SCL Clock Frequency
f
SCL
0
100
0
400
kHz
Hold time (repeated ) START
condition. After this period, the
first clock pulse is generated.
t
HD; STA
4.0
0.6
μ
s
LOW period of the SCL clock
t
LOW
4.7
1.25
μ
s
HIGH period of the SCL clock
t
HIGH
4.0
0.6
μ
s
Set-up time for a repeated START
condition
t
SU; STA
4.7
0.6
μ
s
Data hold time for I
2
C bus devices
t
HD; DAT
0
1
1. A device must internally provide a hold time of at least 300ns 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.
2. The maximum t
HD;
DAT
has only to be met if the device does not stretch the LOW period (t
LOW
) of the SCL signal.
3. A Fast mode I
2
C bus device can be used in a Standard mode I
2
C bus system, but the requirement t
SU; DAT
> = 250ns must then
be met. This will automatically be the case if the device does not stretch the LOW period of the SCL signal. If such a device does
stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line
t
rmax
+ t
SU; DAT
= 1000 + 250 = 1250ns (according to the Standard mode I
2
C bus specification) before the SCL line is released.
4. C
b
= total capacitance of the one bus line in pF.
3.45
2
0
1
0.9
2
μ
s
Data set-up time
t
SU; DAT
250
100
3
ns
Rise time of both SDA and SCL
signals
t
r
1000
2 +0.1C
b4
300
ns
Fall time of both SDA and SCL
signals
t
f
300
2 +0.1C
b4
300
ns
Set-up time for STOP condition
t
SU; STO
4.0
0.6
μ
s
Bus free time between STOP and
START condition
t
BUF
4.7
1.3
μ
s
Pulse width of spikes that must be
suppressed by the input filter
t
SP
N/A
N/A
0.0
50
ns
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