Table 44. Scl Frequency; Figure 20. I 2 C Bus Ac Waveforms And Measurement Circuit - STMicroelectronics STM32L151CB Manual

STM32L151xx, STM32L152xx
Figure 20. I
1. Measurement points are done at CMOS levels: 0.3V
Table 44.
1. R = External pull-up resistance, f
P
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.
2
C bus AC waveforms and measurement circuit
SCL frequency (f
PCLK1
f (kHz)
SCL
400
300
200
100
50
20
= I
SCL
Doc ID 17659 Rev 6
and 0.7V .
DD DD
= 32 MHz, V = 3.3 V)
DD
2
C speed.
Electrical characteristics
(1)(2)
I2C_CCR value
R = 4.7 kΩ
P
0x801B
0x8024
0x8035
0x00A0
0x0140
0x0320
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