Datasheet

Electrical characteristics STM32F303xB STM32F303xC
96/149 DS9118 Rev 14
Figure 25. I
2
C bus AC waveforms and measurement circuit
1. Rs: Series protection resistors, Rp: Pull-up resistors, VDD_I2C: I2C bus supply.
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 the RM0316 reference manual).
2. The maximum tHD;DAT could be 3.45 µs, 0.9 µs and 0.45 µs for standard mode, fast mode and fast mode plus, but must
be less than the maximum of tVD;DAT or tVD;ACK by a transition time.
3. The minimum width of the spikes filtered by the analog filter is above t
SP
(max).
Table 62. I2C analog filter characteristics
(1)
1. Guaranteed by design.
Symbol Parameter Min Max Unit
t
AF
Pulse width of spikes that are
suppressed by the analog filter
50 260 ns
MS19879V3
Rs
I
2
C bus
Rp
Rs
V
DD_I2C
MCU
SDA
SCL
Rp
V
DD_I2C
continued
continued
SDA
SCL
SDA
SCL
70%
30%
70%
30%
70%
30%
70%
30%
70%
30%
70%
30%
t
f
t
f
t
r
t
r
t
SU;DAT
t
HD;DAT
t
HIGH
t
VD;DAT
t
1 / f
SCL
t
LOW
9th clock
1st clock cycle
t
SU;STA
t
HD;STA
t
SP
t
VD;ACK
t
SU;STO
t
BUF
9th clock
S
r
SP
S
HD;STA
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