AM3359, AM3358, AM3357, AM3356, AM3354, AM3352
SPRS717H – OCTOBER 2011 – REVISED MAY 2015
7.8
I
2
C
For more information, see the Inter-Integrated Circuit (I
2
C) section of the
AM335x Sitara Processors
Technical Reference Manual
).
7.8.1
I
2
C Electrical Data and Timing
Table 7-68. I
2
C Timing Conditions – Slave Mode
STANDARD MODE
FAST MODE
PARAMETER
UNIT
MIN
MAX
MIN
MAX
Output Condition
C
b
Capacitive load for each bus line
400
400
pF
Table 7-69. Timing Requirements for I
2
C Input Timings
(see
STANDARD MODE
FAST MODE
NO.
UNIT
MIN
MAX
MIN
MAX
1
t
c(SCL)
Cycle time, SCL
10
2.5
µs
Setup time, SCL high before SDA low (for a repeated
2
t
su(SCLH-SDAL)
4.7
0.6
µs
START condition)
Hold time, SCL low after SDA low (for a START and a
3
t
h(SDAL-SCLL)
4
0.6
µs
repeated START condition)
4
t
w(SCLL)
Pulse duration, SCL low
4.7
1.3
µs
5
t
w(SCLH)
Pulse duration, SCL high
4
0.6
µs
6
t
su(SDAV-SCLH)
Setup time, SDA valid before SCL high
250
ns
7
t
h(SCLL-SDAV)
Hold time, SDA valid after SCL low
0
3.45
µs
Pulse duration, SDA high between STOP and START
8
t
w(SDAH)
4.7
1.3
µs
conditions
9
t
r(SDA)
Rise time, SDA
1000
300
ns
10
t
r(SCL)
Rise time, SCL
1000
300
ns
11
t
f(SDA)
Fall time, SDA
300
300
ns
12
t
f(SCL)
Fall time, SCL
300
300
ns
13
t
su(SCLH-SDAH)
Setup time, high before SDA high (for STOP condition)
4
0.6
µs
14
t
w(SP)
Pulse duration, spike (must be suppressed)
0
50
0
50
ns
(1) 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(SDA-SCLH)
≥
250 ns must then be
met. This is automatically the case if the device does not stretch the LOW period of the SCL signal. If such a device stretches the LOW
period of the SCL signal, it must output the next data bit to the SDA line t
r max
+ t
su(SDA-SCLH)
= 1000 + 250 = 1250 ns (according to the
standard-mode I
2
C-Bus Specification) before the SCL line is released.
(2) A device must internally provide a hold time of at least 300 ns for the SDA signal (referred to the V
IHmin
of the SCL signal) to bridge the
undefined region of the falling edge of SCL.
(3) The maximum t
h(SDA-SCLL)
has only to be met if the device does not stretch the low period [t
w(SCLL)
] of the SCL signal.
Copyright © 2011–2015, Texas Instruments Incorporated
Peripheral Information and Timings
191
Product Folder Links: