STM32F101CB datasheet(63/89 Pages) STMICROELECTRONICS

Part #	STM32F101CB

Description	Medium-density access line, ARM-based 32-bit MCU with 64 or 128 KB Flash, 6 timers, ADC and 7 communication interfaces

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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63 / 89 page

STM32F101x8, STM32F101xB

Electrical characteristics

Doc ID 13586 Rev 15

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Figure 29.

I2C bus AC waveforms and measurement circuit(1)

1.

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

2.

Rs = Series protection resistors, Rp = Pull-up resistors, VDD_I2C = I2C bus supply.

Table 40.

SCL frequency (fPCLK1= 36 MHz, VDD_I2C = 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

±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

0x801E

300

0x8028

200

0x803C

100

0x00B4

50

0x0168

20

0x0384

Rp

Rs

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STM32F101CB Datasheet(PDF) 63 Page - STMicroelectronics

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