STM32L151VBH6 데이터 시트보기 (PDF) - STMicroelectronics

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STM32L151VBH6

Ultra-low-power 32-bit MCU ARM®-based Cortex®-M3, 128KB Flash, 16KB SRAM, 4KB EEPROM, LCD, USB, ADC, DAC

STMicroelectronics 

Electrical characteristics

STM32L151x6/8/B STM32L152x6/8/B

Figure 21. I2C bus AC waveforms and measurement circuit

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1. RS = series protection resistors

2. RP = pull-up resistors

3. VDD_I2C = I2C bus supply

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

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Table 48. SCL frequency (fPCLK1= 32 MHz, VDD = VDD_I2C = 3.3 V)(1)(2)

fSCL (kHz)

I2C_CCR value

RP = 4.7 kΩ

400

0x801B

300

0x8024

200

0x8035

100

0x00A0

50

0x0140

20

0x0320

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 is ±2%. These variations depend on the accuracy of the external

components used to design the application.

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DocID17659 Rev 12

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