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STM32L151VD Datasheet(PDF) 103 Page - STMicroelectronics

Part # STM32L151VD
Description  Ultra-low-power 32-bit MCU ARM-based Cortex-M3, 384KB Flash
PDF  140 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32L151VD Datasheet(HTML) 103 Page - STMicroelectronics

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STM32L151xD STM32L152xD
Electrical characteristics
Doc ID 022027 Rev 6
103/140
Figure 27.
I2C bus AC waveforms and measurement circuit
1.
Measurement points are done at CMOS levels: 0.3VDD and 0.7VDD.
Table 56.
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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