Communications Interfaces; Table 43. I 2 C Characteristics - STMicroelectronics STM32L151CB Manual

Electrical characteristics
6.3.15

Communications interfaces

2
I C interface characteristics
Unless otherwise specified, the parameters given in
performed under ambient temperature, f
summarized in
The line I
with the following restrictions: SDA and SCL are not "true" open-drain I/O pins. When
configured as open-drain, the PMOS connected between the I/O pin and V
but is still present.
2
The I C characteristics are described in
injection characteristics
(SDA and SCL) .
Table 43.
Symbol
t
w(SCLL)
t
w(SCLH)
t
su(SDA)
t
h(SDA)
t
r(SDA)
t
r(SCL)
t
f(SDA)
t
f(SCL)
t
h(STA)
t
su(STA)
t
su(STO)
t
w(STO:STA)
C
b
1. Guaranteed by design, not tested in production.
2. f must be at least 2 MHz to achieve standard mode I
PCLK1
achieve fast mode I²C frequencies. It must be a multiple of 10 MHz to reach the 400 kHz maximum I²C fast
mode clock.
3. The maximum hold time of the Start condition has only to be met if the interface does not stretch the low
period of SCL signal.
4. The device must internally provide a hold time of at least 300 ns for the SDA signal in order to bridge the
undefined region of the falling edge of SCL.
78/109
Table 9.
2
C interface meets the requirements of the standard I
for more details on the input/output alternate function characteristics
2
I C characteristics
Parameter
SCL clock low time
SCL clock high time
SDA setup time
SDA data hold time
SDA and SCL rise time
SDA and SCL fall time
Start condition hold time
Repeated Start condition
setup time
Stop condition setup time
Stop to Start condition time
(bus free)
Capacitive load for each bus
line
Doc ID 17659 Rev 6
STM32L151xx, STM32L152xx
Table 43
frequency and V
PCLK1
Table 43. Refer also to
2 (1)
Standard mode I C
Min Max
4.7
4.0
250
(3)
0
1000
300
4.0
4.7
4.0
4.7
400
C frequencies. It must be at least 4 MHz to
²
are derived from tests
supply voltage conditions
DD
2
C communication protocol
is disabled,
DD
Section 6.3.11: I/O current
2 (1)(2)
Fast mode I C
Min Max
1.3
0.6
100
(4) (3)
0 900
20 + 0.1C 300
b
300
0.6
0.6
0.6
1.3
400
Unit
µs
ns
µs
μs
μs
pF