Datasheet
18
ENS160 Datasheet v0.95 preliminary / December 2020
Table 12: ENS160 I
2
C Timing Parameters
1
Parameter
Symbol
Standard
Fast
Fast Mode Plus
Unit
Min
Max
Min
Max
Min
Max
SCLK clock frequency
f
SCLK
0
100
0
400
0
1000
kHz
Hold time (repeated) START con-
dition. After this period, the first
clock pulse is generated
t
HD_STA
4
-
0.6
-
0.26
-
µs
LOW period of the SCLK clock
t
LOW
4.7
-
1.3
-
0.5
-
µs
HIGH period of the SCLK clock
t
HIGH
4.0
-
0.6
-
0.26
-
µs
Set-up time for a repeated START
condition
t
SU_STA
4.7
-
0.6
-
0.26
-
µs
Data set-up time
t
SU_DAT
250
-
100
2
-
50
2
-
ns
Data hold-time
t
HD_DAT
0
3
3.45
4
0
3
0.9
4
0
3
-
µs
Rise time of SDA and SCLK signals
t
r
-
1000
20
300
20
120
ns
Fall time of SDA and SCLK signals
t
f
-
300
20xV
DDIO
/
5.5
300
20xV
DDIO
/
5.5
120
ns
Set-up time for STOP condition
t
SU_STO
4.0
-
0.6
-
0.26
-
µs
Bus free time between a STOP and
START condition
t
BUF
4.7
-
1.3
-
0.5
-
µs
Capacitive load for each bus line
C
b
-
400
-
400
-
550
pF
Noise margin at the LOW level
V
nL
0.1xV
DDIO
-
0.1xV
DDIO
-
0.1xV
DDIO
-
V
Noise margin at the HIGH level
V
nH
0.2xV
DDIO
-
0.2xV
DDIO
-
0.2xV
DDIO
-
V
Figure 11: Definition of I
2
C Timing Parameters
1
All values referred to V
IHmin
and V
ILmax
levels
2
A fast mode I²C bus device can be used in Standard mode I²C bus system, but the requirement t
SU_DAT
>= 250ns must then be
met. This will automatically be the case if the device does not stretch the LOW period of the SCL signal. If such a device
does stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line t
rmax
. t
SU_DAT
= 1000 + 250 =
1250ns (according to standard mode I²C bus specification) before the SCL line is released.
3
This device internally provides a hold time of at least 300ns for the SDA signal to bridge the undefined region of the falling
edge of the SCL
4
The maximum t
HD_DAT
has only to be met if the device does not stretch the LOW period (t
LOW
) of the SCLK signal
t
r
t
f
t
HD_STA
t
LOW
t
HD_DAT
t
SU_DAT
t
HIGH
t
f
t
SU_STA
t
SP
t
SU_STO
t
r
t
BUF
SDA
SCLK
S
Sr
P S