Texas Instruments TMS320C6727 Benutzerhandbuch
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4.15.3 I2C Electrical Data/Timing
TMS320C6727, TMS320C6726, TMS320C6722
Floating-Point Digital Signal Processors
SPRS268E – MAY 2005 – REVISED JANUARY 2007
4.15.3.1 Inter-Integrated Circuit (I2C) Timing
and
assume testing over recommended operating conditions (see
and
Table 4-34. I2C Input Timing Requirements
NO.
MIN
MAX
UNIT
Standard Mode
10
1
t
c(SCL)
Cycle time, I2Cx_SCL
µ
s
Fast Mode
2.5
Standard Mode
4.7
Setup time, I2Cx_SCL high before I2Cx_SDA
2
t
su(SCLH-SDAL)
µ
s
low
Fast Mode
0.6
Standard Mode
4
3
t
h(SCLL-SDAL)
Hold time, I2Cx_SCL low after I2Cx_SDA low
µ
s
Fast Mode
0.6
Standard Mode
4.7
4
t
w(SCLL)
Pulse duration, I2Cx_SCL low
µ
s
Fast Mode
1.3
Standard Mode
4
5
t
w(SCLH)
Pulse duration, I2Cx_SCL high
µ
s
Fast Mode
0.6
Standard Mode
250
6
t
su(SDA-SCLH)
Setup time, I2Cx_SDA before I2Cx_SCL high
ns
Fast Mode
100
Standard Mode
0
7
t
h(SDA-SCLL)
Hold time, I2Cx_SDA after I2Cx_SCL low
µ
s
Fast Mode
0
0.9
Standard Mode
4.7
8
t
w(SDAH)
Pulse duration, I2Cx_SDA high
µ
s
Fast Mode
1.3
Standard Mode
1000
9
t
r(SDA)
Rise time, I2Cx_SDA
ns
Fast Mode
20 + 0.1C
b
300
Standard Mode
1000
10
t
r(SCL)
Rise time, I2Cx_SCL
ns
Fast Mode
20 + 0.1C
b
300
Standard Mode
300
11
t
f(SDA)
Fall time, I2Cx_SDA
ns
Fast Mode
20 + 0.1C
b
300
Standard Mode
300
12
t
f(SCL)
Fall time, I2Cx_SCL
ns
Fast Mode
20 + 0.1C
b
300
Standard Mode
4
Setup time, I2Cx_SCL high before I2Cx_SDA
13
t
su(SCLH-SDAH)
µ
s
high
Fast Mode
0.6
Standard Mode
N/A
14
t
w(SP)
Pulse duration, spike (must be suppressed)
ns
Fast Mode
0
50
Standard Mode
400
15
C
b
Capacitive load for each bus line
pF
Fast Mode
400
Table 4-35. I2C Switching Characteristics
(1)
NO.
PARAMETER
MIN
MAX
UNIT
Standard Mode
10
16
t
c(SCL)
Cycle time, I2Cx_SCL
µ
s
Fast Mode
2.5
Standard Mode
4.7
Setup time, I2Cx_SCL high before I2Cx_SDA
17
t
su(SCLH-SDAL)
µ
s
low
Fast Mode
0.6
Standard Mode
4
18
t
h(SDAL-SCLL)
Hold time, I2Cx_SCL low after I2Cx_SDA low
µ
s
Fast Mode
0.6
(1)
I2C must be configured correctly to meet the timings in
Peripheral and Electrical Specifications
95