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AD5380
Data Sheet
Rev. C | Page 10 of 40
I2C SERIAL INTERFACE
DVDD = 2.7 V to 5.5 V; AVDD = 4.5 V to 5.5 V or 2.7 V to 3.6 V; AGND = DGND = 0 V; all specifications TMIN to TMAX,
unless otherwise noted.
Table 6.
Limit at T
MIN, TMAX
Unit
Description
F
SCL
400
kHz max
SCL clock frequency
t
1
2.5
s min
SCL cycle time
t
2
0.6
s min
t
HIGH, SCL high time
t
3
1.3
s min
t
LOW, SCL low time
t
4
0.6
s min
t
HD,STA, start/repeated start condition hold time
t
5
100
ns min
t
SU,DAT, data setup time
0.9
s max
t
HD,DAT, data hold time
0
s min
t
HD,DAT, data hold time
t
7
0.6
s min
t
SU,STA, setup time for repeated start
t
8
0.6
s min
t
SU,STO, stop condition setup time
t
9
1.3
s min
t
BUF, bus free time between a STOP and a START condition
t
10
300
ns max
t
R, rise time of SCL and SDA when receiving
0
ns min
t
R, rise time of SCL and SDA when receiving (CMOS compatible)
t
11
300
ns max
t
F, fall time of SDA when transmitting
0
ns min
t
F, fall time of SDA when receiving (CMOS compatible)
300
ns max
t
F, fall time of SCL and SDA when receiving
ns min
t
F, fall time of SCL and SDA when transmitting
C
b
400
pF max
Capacitive load for each bus line
1 Guaranteed by design and characterization, not production tested.
3 A master device must provide a hold time of at least 300 ns for the SDA signal (referred to the VIH min of the SCL signal) in order to bridge the undefined region of
SCL’s falling edge.
4 Cb is the total capacitance, in pF, of one bus line. tR and tF are measured between 0.3 DVDD and 0.7 DVDD.
START
CONDITION
REPEATED
START
CONDITION
STOP
CONDITION
t9
t3
t1
t11
t4
t10
t4
t5
t7
t6
t8
t2
SDA
SCL
03731-006
Figure 6. I2C Compatible Serial Interface Timing Diagram