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DS90UH927Q
Recommended Timing for the Serial Control Bus
Over 3.3V supply and temperature ranges unless otherwise specified.
Symbol
Parameter
f
SCL
SCL Clock Frequency
t
LOW
SCL Low Period
t
HIGH
SCL High Period
t
Hold time for a start or a
HD;STA
repeated start condition
Figure 9
t
Set Up time for a start or a
SU:STA
repeated start condition
Figure 9
t
Data Hold Time
HD;DAT
Figure 9
t
Data Set Up Time
SU;DAT
Figure 9
t
Set Up Time for STOP
SU;STO
Condition
Figure 9
Bus Free Time
t
Between STOP and START
BUF
Figure 9
SCL & SDA Rise Time,
t
r
Figure 9
SCL & SDA Fall Time,
t
f
Figure 9
DC and AC Serial Control Bus Characteristics
Over 3.3V supply and temperature ranges unless otherwise specified.
Symbol
Parameter
V
IH
Input High Level
V
IL
Input Low Level Voltage
V
Input Hysteresis
HY
V
OL
I
in
t
SDA RiseTime – READ
R
t
SDA Fall Time – READ
F
t
Set Up Time — READ
SU;DAT
t
Hold Up Time — READ
HD;DAT
t
Input Filter
SP
C
Input Capacitance
in
10
(Note
Conditions
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast Mode
Standard Mode
Fast mode
(Note
Conditions
SDA and SCL
SDA and SCL
SDA or SCL, IOL = 1.25mA
SDA or SCL, Vin = V
or GND
DDIO
≤
SDA, RPU = 10kΩ, Cb
400pF,
Figure 9
Figure 9
SDA or SCL
2,
Note
3,
Note
4)
Min
0
0
4.7
1.3
4.0
0.6
4.0
0.6
4.7
0.6
0
0
250
100
4.0
0.6
4.7
1.3
2,
Note
3,
Note
4)
Min
0.7*
V
DDIO
GND
0
-10
Figure 9
Copyright © 1999-2012, Texas Instruments Incorporated
Typ
Max
Units
100
kHz
400
kHz
µs
µs
µs
µs
µs
µs
µs
µs
3.45
µs
0.9
µs
ns
ns
µs
µs
µs
µs
1000
ns
300
ns
300
ns
300
ns
Typ
Max
Units
V
V
DD33
0.3*
V
V
DD33
>50
mV
0.36
V
+10
µA
430
ns
20
ns
560
ns
615
ns
50
ns
<5
pF
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