Datasheet

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STM32F412xE/G Electrical characteristics
161
Figure 38. I
2
C bus AC waveforms and measurement circuit
1. R
S
= series protection resistor.
2. R
P
= external pull-up resistor.
3. V
DD_I2C
is the I2C bus power supply.
4. The maximum data hold time has only to be met if the interface does not stretch the low period of SCL
signal.
5. The minimum width of the spikes filtered by the analog filter is above t
SP
(max)
Table 62. SCL frequency (f
PCLK1
= 50 MHz, V
DD
= V
DD_I2C
= 3.3 V)
(1)(2)
1. R
P
= External pull-up resistance, f
SCL
= I
2
C speed
2. For speeds around 200 kHz, the tolerance on the achieved speed is of ±5%. For other speed ranges, the
tolerance on the achieved speed is ±2%. These variations depend on the accuracy of the external
components used to design the application.
f
SCL
(kHz)
I2C_CCR value
R
P
= 4.7 kΩ
400 0x8019
300 0x8021
200 0x8032
100 0x0096
50 0x012C
20 0x02EE
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