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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32L152C6 датащи(PDF) 88 Page - STMicroelectronics |
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STM32L152C6 датащи(HTML) 88 Page - STMicroelectronics |
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88 / 131 page  Electrical characteristics STM32L151x6/8/B, STM32L152x6/8/B 88/131 DocID17659 Rev 9 6.3.16 Communication interfaces I2C interface characteristics The STM32L15xxx product line I2C interface meets the requirements of the standard I2C communication protocol with the following restrictions: SDA and SCL are not “true” open- drain I/O pins. When configured as open-drain, the PMOS connected between the I/O pin and VDD is disabled, but is still present. The I2C characteristics are described in Table 47. Refer also to Section 6.3.12: I/O current injection characteristics for more details on the input/output alternate function characteristics (SDA and SCL). Table 47. I2C characteristics Symbol Parameter Standard mode I2C(1) 1. Guaranteed by design, not tested in production. Fast mode I2C(1)(2) 2. fPCLK1 must be at least 2 MHz to achieve standard mode I²C frequencies. It must be at least 4 MHz to achieve fast mode I²C frequencies. It must be a multiple of 10 MHz to reach the 400 kHz maximum I²C fast mode clock. Unit Min Max Min Max tw(SCLL) SCL clock low time 4.7 - 1.3 - µs tw(SCLH) SCL clock high time 4.0 - 0.6 - tsu(SDA) SDA setup time 250 - 100 - ns th(SDA) SDA data hold time 0 - 0 900(3) 3. The maximum Data hold time has only to be met if the interface does not stretch the low period of SCL signal. tr(SDA) tr(SCL) SDA and SCL rise time - 1000 20 + 0.1Cb 300 tf(SDA) tf(SCL) SDA and SCL fall time - 300 - 300 th(STA) Start condition hold time 4.0 - 0.6 - µs tsu(STA) Repeated Start condition setup time 4.7 - 0.6 - tsu(STO) Stop condition setup time 4.0 - 0.6 - μs tw(STO:STA) Stop to Start condition time (bus free) 4.7 - 1.3 - μs Cb Capacitive load for each bus line - 400 - 400 pF |
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