Communication Interfaces; Table 57. I 2 C Characteristics - STMicroelectronics STM32F050G6 Manual

Electrical characteristics
6.3.19

Communication interfaces

2
I C interface characteristics
Unless otherwise specified, the parameters given in
performed under ambient temperature, f
summarized in
2
The I C interface meets the requirements of the standard I
the following restrictions: the I/O pins SDA and SCL are mapped to are not "true" open-
drain. When configured as open-drain, the PMOS connected between the I/O pin and V
disabled, but is still present.
2
The I C characteristics are described in
characteristics
and SCL) .
2
Table 57. I C characteristics
Symbol Parameter
t SCL clock low time
w(SCLL)
t SCL clock high time
w(SCLH)
t SDA setup time
su(SDA)
t SDA data hold time
h(SDA)
t
r(SDA)
SDA and SCL rise time
t
r(SCL)
t
f(SDA)
SDA and SCL fall time
t
f(SCL)
t Start condition hold time
h(STA)
Repeated Start condition
t
su(STA)
setup time
t Stop condition setup time
su(STO)
Stop to Start condition time
t
w(STO:STA)
(bus free)
Capacitive load for each bus
C
b
line
1. The I2C characteristics are the requirements from I2C bus specification rev03. They are guaranteed by design when
I2Cx_TIMING register is correctly programmed (Refer to reference manual). These characteristics are not tested in
production.
2. The maximum data hold time has only to be met if the interface does not stretch the low period of SCL signal.
3. The device must internally provide a hold time of at least 300ns for the SDA signal in order to bridge the undefined region
of the falling edge of SCL.
4. The device must internally provide a hold time of at least 120ns for the SDA signal in order to bridge the undefined region
of the falling edge of SCL.
76/98
Table 15.
for more details on the input/output alternate function characteristics (SDA
(1)
Standard mode
Min
4.7
4.0
250
(3)
0 3450
-
-
4.0
4.7
4.0
4.7
-
Doc ID 023079 Rev 3
Table 57
frequency and V
PCLK
Table 57. Refer also to
Fast mode
Max Min Max
- 1.3
- 0.6
- 100
(2) (3)
0 900
1000 - 300
300 - 300
- 0.6
- 0.6
- 0.6
- 1.3
400 - 400
STM32F050xx
are derived from tests
supply voltage conditions
DD
2
C communication protocol with
Section 6.3.13: I/O port
Fast Mode Plus
Min Max
- 0.5 -
- 0.26 -
- 50 -
(2) (4)
0 450
- 120
- 120
- 0.26 -
- 0.26 -
- 0.26 -
- 0.5 -
- 550
is
DD
Unit
µs
(2)
ns
µs
s
s
pF