STM32L152C8H6(2013) 查看數據表（PDF） - STMicroelectronics

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STM32L152C8H6
(Rev.:2013)

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

STMicroelectronics 

STM32L151x6/8/B, STM32L152x6/8/B

Electrical characteristics

Figure 20. I2C bus AC waveforms and measurement circuit

VDD

VDD

I2C bus

4 .7 k

4 .7 k

STM32L15xxx

100

SDA

100

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)

ai17855

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

Table 48.

SCL frequency (fPCLK1= 32 MHz, VDD = 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.

Doc ID 17659 Rev 8

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