STM32F103VB 데이터 시트보기 (PDF) - STMicroelectronics

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STM32F103VB

Performance line, ARM-based 32-bit MCU with Flash, USB, CAN, seven 16-bit timers, two ADCs and nine communication interfaces

STMicroelectronics 

Electrical characteristics

Figure 18. I2C bus AC waveforms and measurement circuit

VDD

VDD

I2C bus

4 .7 kΩ 4 .7 kΩ

100Ω

100Ω

STM32F103xx

SDA

SCL

STM32F103xx

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 35.

SCL frequency (fPCLK1= 36 MHz.,VDD = 3.3 V)(1)(2)(3)

fSCL (kHz)

I2C_CCR value

RP = 4.7 kΩ

400

TBD

300

TBD

200

TBD

100

TBD

50

TBD

20

TBD

1. TBD = to be determined.

2. RP = External pull-up resistance, fSCL = I2C speed,

3. 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.

50/67

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