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STM32H747AI Datasheet(PDF) 213 Page - STMicroelectronics |
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STM32H747AI Datasheet(HTML) 213 Page - STMicroelectronics |
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213 / 252 page  DS12930 Rev 1 203/242 STM32H747xI/G Electrical characteristics 221 The SDA and SCL I/O requirements are met with the following restrictions: • The SDA and SCL I/O pins are not “true” open-drain. When configured as open-drain, the PMOS connected between the I/O pin and VDDIOx is disabled, but still present. • The 20 mA output drive requirement in Fast-mode Plus is not supported. This limits the maximum load CLoad supported in Fm+, which is given by these formulas: tr(SDA/SCL)=0.8473xRPxCLoad RP(min)= (VDD-VOL(max))/IOL(max) Where RP is the I2C lines pull-up. Refer to Section 6.3.18: I/O port characteristics for the I2C I/Os characteristics. All I2C SDA and SCL I/Os embed an analog filter. Refer to the table below for the analog fil- ter characteristics: USART interface characteristics Unless otherwise specified, the parameters given in Table 118 for USART are derived from tests performed under the ambient temperature, fPCLKx frequency and VDD supply voltage conditions summarized in Table 22: General operating conditions, with the following configuration: • Output speed is set to OSPEEDRy[1:0] = 10 • Capacitive load CL = 30 pF • Measurement points are done at CMOS levels: 0.5VDD • IO Compensation cell activated. • VOS level set to VOS1 Table 116. Minimum i2c_ker_ck frequency in all I2C modes Symbol Parameter Condition Min Unit f(I2CCLK) I2CCLK frequency Standard-mode - 2 MHz Fast-mode Analog Filtre ON DNF=0 8 Analog Filtre OFF DNF=1 9 Fast-mode Plus Analog Filtre ON DNF=0 17 Analog Filtre OFF DNF=1 16 - Table 117. I2C analog filter characteristics(1) 1. Guaranteed by characterization results. Symbol Parameter Min Max Unit tAF Maximum pulse width of spikes that are suppressed by analog filter 50(2) 2. Spikes with widths below tAF(min) are filtered. 80(3) 3. Spikes with widths above tAF(max) are not filtered. ns |
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