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STM32L151VBT6DTR データシート(PDF) 85 Page - STMicroelectronics

部品番号 STM32L151VBT6DTR
部品情報  Ultra-low-power 32-bit MCU ARM-based Cortex-M3
PDF  121 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32L151VBT6DTR データシート(HTML) 85 Page - STMicroelectronics

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STM32L151x6/8/B, STM32L152x6/8/B
Electrical characteristics
Doc ID 17659 Rev 8
85/121
Figure 20.
I2C bus AC waveforms and measurement circuit
1.
Measurement points are done at CMOS levels: 0.3VDD and 0.7VDD.
Table 48.
SCL frequency (fPCLK1= 32 MHz, VDD = 3.3 V)
(1)(2)
1.
RP = External pull-up resistance, fSCL = I
2C 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.
fSCL (kHz)
I2C_CCR value
RP = 4.7 kΩ
400
0x801B
300
0x8024
200
0x8035
100
0x00A0
50
0x0140
20
0x0320
ai17855
START
SDA
100
4.7k
I2C bus
4.7k
100
VDD
VDD
STM32L15xxx
SDA
SCL
tf(SDA)
tr(SDA)
SCL
th(STA)
tw(SCKH)
tw(SCKL)
tsu(SDA)
tr(SCK)
tf(SCK)
th(SDA)
S TART REPEATED
START
tsu(STA)
tsu(STO)
STOP
tsu(STA:STO)



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