Datasheet

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SLOS327C − AUGUST 2000 − REVISED MAY 2001
26
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
A6 A0 ACK
Acknowledge
(From
Receiver)
I
2
C Device Address and
Read/Write Bit
R/W D7 D0 ACK
Stop
Condition
Acknowledge
(From
Transmitter)
Last Data Byte
SDA
D7 D6 D1 D0 ACK
First Data
Byte
Start
Condition
Not
Acknowledge
(Transmitter)
Other
Data Bytes
Figure 31. Multiple Byte Read Transfer
timing characteristics for I
2
C interface
PARAMETER
STANDARD
MODE
FAST MODE
UNITS
PARAMETER
MIN MAX MIN MAX
UNITS
f
SCL
Clock frequency, SCL 0 100 0 400 kHz
t
w(H)
Pulse duration, SCL high 4 0.6 µs
t
w(L)
Pulse duration, SCL low 4.7 1.3 µs
t
r
Rise time, SCL and SDA 1000 300 ns
t
f
Fall time, SCL and SDA 300 300 ns
t
su(1)
Setup time, SDA to SCL 250 100 ns
t
h(1)
Hold time, SCL to SDA 0 0 ns
t
(buf)
Bus free time between stop and start condition 4.7 1.3 µs
t
su(2)
Setup time, SCL to start condition 4.7 0.6 µs
t
h(2)
Hold time, start condition to SCL 4 0.6 µs
t
su(3)
Setup time, SCL to stop condition 4 0.6 µs
t
w(H)
t
w(L)
t
r
t
f
t
su(1)
t
h(1)
SCL
SDA
Figure 32. SCL and SDA Timing
t
su(2)
t
h(2)
t
su(3)
t
(buf)
SCL
SDA
Start Condition Stop Condition
Figure 33. Start and Stop Conditions