STM32F103VC データシートの表示（PDF） - STMicroelectronics

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STM32F103VC

Medium-density performance line ARM-based 32-bit MCU with 64 or 128 KB Flash, USB, CAN, 7 timers, 2 ADCs, 9 com. interfaces

STMicroelectronics 

STM32F103xC, STM32F103xD, STM32F103xE

Electrical characteristics

Figure 44. I2C bus AC waveforms and measurement circuit

VDD

VDD

I2C bus

4 .7 kΩ 4 .7 kΩ

100Ω

100Ω

STM32F103xx

SDA

SCL

SD A

tf(SDA)

S TART

S TART REPEATED

tsu(STA)

S TART

tr(SDA)

tsu(SDA)

th(STA)

tw(SCKL)

th(SDA)

S TOP

tsu(STA:STO)

SCL

tw(SCKH)

tr(SCK)

tf(SCK)

tsu(STO)

ai14149b

1. Measurement points are done at CMOS levels: 0.3VDD and 0.7VDD.

Table 51.

SCL frequency (fPCLK1= 36 MHz.,VDD = 3.3 V)(1)(2)

fSCL (kHz)

I2C_CCR value

RP = 4.7 k

400

0x801E

300

0x8028

200

0x803C

100

0x00B4

50

0x0168

20

0x0384

1. RP = External pull-up resistance, fSCL = I2C 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 2%. These variations depend on the accuracy of the external

components used to design the application.

Doc ID 14611 Rev 7

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