Datasheet

DS9118 Rev 14 95/149
STM32F303xB STM32F303xC Electrical characteristics
125
6.3.17 Communications interfaces
I
2
C interface characteristics
The I
2
C interface meets the timings requirements of the I
2
C-bus specification and user
manual rev.03 for:
• Standard-mode (Sm) : with a bit rate up to 100 Kbits/s
• Fast-mode (Fm) : with a bit rate up to 400 Kbits/s
• Fast-mode Plus (Fm+) : with a bit rate up to 1Mbits/s
The I
2
C timings requirements are guaranteed by design when the I
2
C peripheral is properly
configured (refer to Reference manual).
The SDA and SCL I/O requirements are met with the following restrictions: the SDA and
SCL I/O pins are “true” open-drain. When configured as open-drain, the PMOS connected
between the I/O pin and VDDIOx is disabled, but is still present. Only FTf I/O pins support
Fm+ low level output current maximum requirement. Refer to
Section 6.3.14: I/O port
characteristics.
All I
2
C I/Os embed an analog filter. refer to theTable 62: I2C analog filter characteristics.
Table 61. I2C timings specification (see I2C specification, rev.03, June 2007)
(1)
Symbol Parameter
Standard mode Fast mode Fast Mode Plus
Unit
Min Max Min Max Min Max
f
SCL
SCL clock frequency 0 100 0 400 0 1000 KHz
t
LOW
Low period of the SCL clock 4.7 - 1.3 - 0.5 - µs
t
HIGH
High Period of the SCL clock 4 0.6 0.26 - µs
t
r
Rise time of both SDA and SCL
signals
- 1000 - 300 - 120 ns
t
f
Fall time of both SDA and SCL
signals
- 300 - 300 - 120 ns
t
HD;DAT
Data hold time 0 - 0 - 0 - µs
t
VD;DAT
Data valid time - 3.45
(2)
-0.9
(2)
-0.45
(2)
µs
t
VD;ACK
Data valid acknowledge time - 3.45
(2)
-0.9
(2)
-0.45
(2)
µs
t
SU;DAT
Data setup time 250 - 100 - 50 - ns
t
HD:STA
Hold time (repeated) START
condition
4.0 - 0.6 - 0.26 - µs
t
SU:STA
Set-up time for a repeated START
condition
4.7 - 0.6 - 0.26 µs
t
SU:STO
Set-up time for STOP condition 4.0 - 0.6 - 0.26 - µs
t
BUF
Bus free time between a
STOP and START condition
4.7 - 1.3 - 0.5 - µs
C
b
Capacitive load for each bus line - 400 - 400 - 550 pF
t
SP
Pulse width of spikes that are
suppressed by the analog filter for
Standard and Fast mode
050
(3)
050
(3)
--ns
Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.